Items where Author is "Ram Sagar, "

Bhatt, Himali ; Ram Sagar, ; Pandey, J. C. (2012) Stellar contents and star formation in the young cluster Stock 18 New Astronomy, 17 (2). pp. 160-166. ISSN 1384-1076

Ram Sagar, ; Omar, Amitesh ; Kumar, Brijesh ; Gopinathan, Maheswar ; Pandey, Shashi B. ; Bangia, Tarun ; Pant, Jayshreekar ; Shukla, Vishal ; Yadava, Shobhit (2011) The new 130-cm optical telescope at Devasthal, Nainital Current Science, 101 (8). pp. 1020-1023. ISSN 0011-3891

Yadav, R. K. S. ; Glushkhova, E. V. ; Sariya, Devesh Path ; Porokhova, A. V. ; Kumar, Brijesh ; Ram Sagar, (2011) Optical photometric study of the open clusters Koposov 12, Koposov 53 and Koposov 77 Monthly Notices of the Royal Astronomical Society, 414 (1). pp. 652-658. ISSN 0035-8711

Roy, Rupak ; Kumar, Brijesh ; Moskvitin, Alexander S. ; Benetti, Stefano ; Fatkhullin, Timur A. ; Kumar, Brajesh ; Misra, Kuntal ; Bufano, Filomena ; Martin, Ralph ; Sokolov, Vladimir V. ; Pandey, S. B. ; Chandola, H. C. ; Ram Sagar, (2011) SN 2008gz – most likely a normal Type IIP even Monthly Notices of the Royal Astronomical Society, 414 (1). pp. 167-183. ISSN 0035-8711

Bangia, Tarun ; Omar, Amitesh ; Ram Sagar, ; Kumar, Ashish ; Bhattacharjee, Samaresh ; Reddy, Arjun ; Phanikumar, (2011) Study of atmospheric aerosols over the central Himalayan region using a newly developed Mie light detection and ranging system: preliminary results Journal of Applied Remote Sensing, 5 . 053521. ISSN 1931-3195

Dumka, U. C. ; Krishnamoorthy, K. ; Kumar, Rajesh ; Hegde, P. ; Ram Sagar, ; Pant, P. ; Singh, Narendra ; Babu, S. Suresh (2010) Characteristics of aerosol black carbon mass concentration over a high altitude location in the central Himalayas from multi-year measurements Atmospheric Research, 96 (4). pp. 510-521. ISSN 0169-8095

Kamble, Atish ; Misra, Kuntal ; Bhattacharya, D. ; Ram Sagar, (2009) Optical observations of GRB 050401 afterglow : a case for double-jet model Monthly Notices of the Royal Astronomical Society, 394 (1). pp. 214-220. ISSN 0035-8711

Yadav, R. K. S. ; Kumar, Brijesh ; Subramaniam, A. ; Ram Sagar, ; Mathew, Blesson (2008) Optical and near-infrared photometric study of the open cluster NGC 637 and 957 Monthly Notices of the Royal Astronomical Society, 390 (3). pp. 985-996. ISSN 0035-8711

Medhi, Biman J. ; Maheswar, G. ; Pandey, J. C. ; Kumar, T. S. ; Ram Sagar, (2008) Optical polarimetric study of open clusters: distribution of interstellar matter towards NGC 654 Monthly Notices of the Royal Astronomical Society, 388 (1). pp. 105-116. ISSN 0035-8711

Dumka, U. C. ; Krishna Moorthy, K. ; Pant, P. ; Hegde, P. ; Ram Sagar, ; Pandey, K. (2008) Physical and optical characteristics of atmospheric aerosols during ICARB at Manora Peak, Nainital: a sparsely inhabited, high-altitude location in the Himalayas Journal of Earth System Science, 117 (S1). pp. 399-405. ISSN 0253-4126

Kaur, Ramanpreet ; Paul, Biswajit ; Kumar, Brijesh ; Ram Sagar, (2008) Multiwavelength study of the transient X-ray binary IGR J01583+6713 Monthly Notices of the Royal Astronomical Society, 386 (4). pp. 2253-2261. ISSN 0035-8711

Dumka, U. C. ; Krishna Moorthy, K. ; Satheesh, S. K. ; Ram Sagar, ; Pant, P. (2008) Short-period modulations in aerosol optical depths over the central Himalayas: role of mesoscale processes Journal of Applied Meteorology and Climatology, 47 (5). pp. 1467-1475. ISSN 1558-8432

Kaur, Ramanpreet ; Paul, Biswajit ; Kumar, Brijesh ; Ram Sagar, (2008) A study of the long-term evolution of quasi-periodic oscillations in the accretion-powered X-ray pulsar 4U 1626-67 The Astrophysical Journal, 676 (2). pp. 1184-1188. ISSN 0004-637X

Misra, Kuntal ; Pooley, Dave ; Chandra, Poonam ; Bhattacharya, D. ; Ray, Alak K. ; Ram Sagar, ; Lewin, Walter H. G. (2007) Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio Monthly Notices of the Royal Astronomical Society, 381 (1). pp. 280-292. ISSN 0035-8711

Kaur, Ramanpreet ; Paul, Biswajit ; Raichur, Harsha ; Ram Sagar, (2007) Quasi-periodic oscillations in XTE J0111.2-7317: highest frequency among the HMXB pulsars The Astrophysical Journal, 660 (2). pp. 1409-1412. ISSN 0004-637X

Ram Sagar, (2007) A modern 3.6 meter new technology optical telescope as a major national initiative in Astrophysics National Academy Science Letters (India), 30 (7-8). pp. 209-212. ISSN 0250-541X

Stalin, C. S. ; Gopa-Krishna, ; Ram Sagar, ; Wiita, Paul J. ; Mohan, V. ; Pandey, A. K. (2006) Multiband optical monitoring of the blazars S5 0716+714 and BL lacertae Monthly Notices of the Royal Astronomical Society, 366 (4). pp. 1337-1345. ISSN 0035-8711

Ram Sagar, (2006) Aryabhatta Research Institute of Observational Sciences: reincarnation of a 50 year old State Observatory of Nainital Bulletin of the Astronomical Society of India, 34 (2). pp. 37-64. ISSN 0304-9523

Anandarao, B. G. ; Pal, S. ; Mondal, S. ; Nandi, A. ; Bhattacharyya, A. ; Mandal, S. ; Ram Sagar, ; Pandey, J. C. ; Pati, A. ; Saha, S. K. (2005) SS 433: results of a recent multiwavelength campaign Monthly Notices of the Royal Astronomical Society, 362 (3). pp. 957-965. ISSN 0035-8711

Misra, Kuntal ; Kamble, Atish P. ; Bhattacharya, D. ; Ram Sagar, (2005) Multiband optical photometry and bolometric light curve of the type la supernova 2004S Monthly Notices of the Royal Astronomical Society, 360 (2). pp. 662-668. ISSN 0035-8711

Pandey, A. K. ; Upadhyay, K. ; Ogura, K. ; Ram Sagar, ; Mohan, V. ; Mito, H. ; Bhatt, H. C. ; Bhatt, B. C. (2005) Stellar contents of two young open clusters: NGC 663 and 654 Monthly Notices of the Royal Astronomical Society, 358 (4). pp. 1290-1308. ISSN 0035-8711

Stalin, C. S. ; Gupta, Alok C. ; Gopal- Krishna, ; Wiita, Paul J. ; Ram Sagar, (2005) Intranight optical variability of BL Lacs, radio-quiet quasars and radio-loud quasars Monthly Notices of the Royal Astronomical Society, 356 (2). pp. 607-614. ISSN 0035-8711

Ram Sagar, ; Mary, David L. (2005) Facilities at ARIES for the Nainital-Cape Survey Journal of Astrophysics and Astronomy, 26 (2-3). pp. 339-347. ISSN 0250-6335

Ram Sagar, ; Misra, Kuntal (2005) Optical observations of GRB afterglows from India Bulletin of the Astronomical Society of India, 33 (2). pp. 209-217. ISSN 0304-9523

Kumar, Brijesh ; Ram Sagar, ; Sanwal, B. B. ; Bessell, M. S. (2004) On the highly reddened members in six young galactic star clusters - a multiwavelength study Monthly Notices of the Royal Astronomical Society, 353 (3). pp. 991-1014. ISSN 0035-8711

Yadav, R. K. S. ; Ram Sagar, (2004) A comprehensive CCD photometric study of the open cluster NGC 2421 Monthly Notices of the Royal Astronomical Society, 351 (2). pp. 667-675. ISSN 0035-8711

Stalin, C. S. ; Gopal-Krishna, ; Ram Sagar, ; Wiita, Paul J. (2004) Intranight optical variability of radio-quiet and radio lobe-dominated quasars Monthly Notices of the Royal Astronomical Society, 350 (1). pp. 175-188. ISSN 0035-8711

Yadav, R. K. S. ; Ram Sagar, (2004) UBV RI CCD photometric study of the open clusters Basel 4 and NGC 7067 Monthly Notices of the Royal Astronomical Society, 349 (4). pp. 1481-1492. ISSN 0035-8711

Lata, Sneh ; Mohan, V. ; Pandey, A. K. ; Ram Sagar, (2004) CCD photometry of the unstudied galactic star clusters Be 10, Be 67 and To 5 Bulletin of the Astronomical Society of India, 32 (1). pp. 59-74. ISSN 0304-9523

Ram Sagar, ; Stalin, C. S. ; Gopal-Krishna, ; Wiita, Paul J. (2004) Intranight optical variability of blazars Monthly Notices of the Royal Astronomical Society, 348 (1). pp. 176-186. ISSN 0035-8711

Stalin, C. S. ; Gopal-Krishna, ; Ram Sagar, ; Wiita, Paul J. (2004) Optical variability properties of high luminosity AGN classes Journal of Astrophysics and Astronomy, 25 (1-2). pp. 1-55. ISSN 0250-6335

Joshi, Santosh ; Girish, V. ; Ram Sagar, ; Kurtz, D. W. ; Martinez, P. ; Kumar, Brijesh ; Seetha, S. ; Ashoka, B. N. ; Zhou, A. (2003) Discovery of unusual pulsations in the cool, evolved Am stars HD 98851 and HD 102480 Monthly Notices of the Royal Astronomical Society, 344 (2). pp. 431-438. ISSN 0035-8711

Gopal-Krishna, ; Stalin, C. S. ; Ram Sagar, ; Wiita, Paul J. (2003) Clear evidence for intranight optical variability in radio-quiet quasars The Astrophysical Journal, 586 (1). L25-L28. ISSN 0004-637X

Joshi, Yogesh C. ; Pandey, Anil K. ; Narasimha, D. ; Ram Sagar, (2003) Possible microlensing event in the direction of M31 Bulletin of the Astronomical Society of India, 31 (3-4). pp. 417-418. ISSN 0304-9523

Pandey, S. B. ; Sahu, D. K. ; Anupama, G. C. ; Bhattacharya, D. ; Ram Sagar, (2003) SN 2002ap, the hypernova of class Ic Bulletin of the Astronomical Society of India, 31 (3-4). pp. 351-352. ISSN 0304-9523

Chatterjee, S. ; Kumar, Brijesh ; Ram Sagar, (2002) On mass and velocity distributions in members of star clusters : an analytical approach Bulletin of the Astronomical Society of India, 30 (4). pp. 951-971. ISSN 0304-9523

Yadav, R. K. S. ; Ram Sagar, (2002) A deep UBVRI CCD photometric study of the open clusters Tr 1 and Be 11 Monthly Notices of the Royal Astronomical Society, 337 (1). pp. 133-146. ISSN 0035-8711

Ram Sagar, (2002) Observations of GRB afterglows from Nainital : evidence in favour of Jet Model Bulletin of the Astronomical Society of India, 30 (1). pp. 237-248. ISSN 0304-9523

Kandpal, H. C. ; Mehta, D. S. ; Gopal, E. S. R. ; Vaishya, J. S. ; Sanwal, B. B. ; Singh, M. ; Ram Sagar, (2002) Determining field correlations produced by stars from the study of spectral changes in double slit experiment Astrophysics and Space Science, 280 (3). pp. 209-222. ISSN 0004-640X

Ram Sagar, (2002) The mass function of young star clusters in our galaxy and nearby galaxies: is it universal? Astronomical Society of the Pacific, 207 . pp. 515-524. ISSN 0004-6280

Nagaraja Naidu, B. ; Srinivasan, R. ; Mohan, V. ; Ram Sagar, (2001) Performance of the IIA mosaic CCD camera system Bulletin of the Astronomical Society of India, 29 (4). pp. 545-561. ISSN 0304-9523

Joshi, Yogesh C. ; Pandey, Anil K. ; Narasimha, D. ; Ram Sagar, (2001) Search for microlensing events towards M31 galaxy Bulletin of the Astronomical Society of India, 29 (4). pp. 531-544. ISSN 0304-9523

Ram Sagar, ; Naidu, B. N. ; Mohan, V. (2001) A deep VI CCD photometric study of the neglected galactic star cluster NGC 6631 Bulletin of the Astronomical Society of India, 29 (4). pp. 519-530. ISSN 0304-9523

Ram Sagar, ; Munari, U. ; De Boer, K. S. (2001) A multicolour CCD photometric and mass function study of the distant Southern open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253 Monthly Notices of the Royal Astronomical Society, 327 (1). pp. 23-45. ISSN 0035-8711

Ram Sagar, (2001) Emission from GRBs and their afterglows : Indian observations Bulletin of the Astronomical Society of India, 29 (3). pp. 215-229. ISSN 0304-9523

Pandey, A. K. ; Nilakshi, ; Ogura, K. ; Ram Sagar, ; Tarusawa, K. (2001) NGC 7654: An interesting cluster to study star formation history Astronomy & Astrophysics, 374 (2). pp. 504-522. ISSN 0004-6361

Richtler, T. ; Ram Sagar, (2001) A study of the old galactic star cluster Berkeley 32 Bulletin of the Astronomical Society of India, 29 (1). pp. 53-70. ISSN 0304-9523

Ashoka, B. N. ; Kumar, ; Babu, V. C. ; Seetha, S. ; Girish, V. ; Gupta, S. K. ; Ram Sagar, ; Joshi, S. ; Narang, P. (2001) Development of a three channel photometer for UPSO, Naini Tal Journal of Astrophysics and Astronomy, 22 (1). pp. 131-144. ISSN 0250-6335

Kumar, Brijesh ; Ram Sagar, ; Rautela, B. S. ; Srivastava, J. B. ; Srivastava, R. K. (2000) Sky transparency over Naini Tal : a retrospective study Bulletin of the Astronomical Society of India, 28 (4). pp. 675-686. ISSN 0304-9523

Gopal-Krishna, ; Gupta, Alok C. ; Ram Sagar, ; Wiita, Paul J. ; Chaubey, U. S. ; Stalin, C. S. (2000) Rapid optical variability in radio-quiet QSOs Monthly Notices of the Royal Astronomical Society, 314 (4). pp. 815-825. ISSN 0035-8711

Ashoka, B. N. ; Seetha, S. ; Raj, E. ; Chaubey, U. S. ; Gupta, S. K. ; Josh, S. ; Martinez, Peter ; Kurtz, D. W. ; Ram Sagar, ; Kasturirangan, K. (2000) Survey for roAp stars in the Northern sky from Naini Tal Bulletin of the Astronomical Society of India, 28 (2). pp. 251-254. ISSN 0304-9523

Subramaniam, Annapurni ; Ram Sagar, (2000) Globular cluster systems in giant elliptical galaxies : a probe for the galaxy formation and evolution Bulletin of the Astronomical Society of India, 28 (1). pp. 163-164. ISSN 0304-9523

Mohan, V. ; Uddin, W. ; Ram Sagar, ; Gupta, S. K. (1999) Atmospheric extinction at Devasthal, Naini Tal Bulletin of the Astronomical Society of India, 27 (4). pp. 601-608. ISSN 0304-9523

Subramaniam, Annapurni ; Ram Sagar, (1999) Multicolour deep CCD Photometry and Stellar evolutionary analysis of NGC 1907, NGC 1912, NGC 2383, NGC 2384 and NGC 6709 using synthetic colour-magnitude diagrams The Astronomical Journal, 117 (2). pp. 937-961. ISSN 0004-6256

Ram Sagar, ; Griffiths, W. K. (1998) Mass functions of five distant Northern open star clusters Monthly Notices of the Royal Astronomical Society, 299 (3). pp. 777-788. ISSN 0035-8711

Ram Sagar, ; Griffiths, W. K. (1998) BVI CCD photometry of the distant open star clusters Berkeley 81, Berkeley 99, NGC 6603 and NGC 7044 Monthly Notices of the Royal Astronomical Society, 299 (1). pp. 1-23. ISSN 0035-8711

Pant, P. ; Ram Sagar, (1998) Proposed microthermal measurements at Devasthal Bulletin of the Astronomical Society of India, 26 . pp. 397-402. ISSN 0304-9523

Ram Sagar, (1997) The ages of the galactic globular clusters Journal of Astrophysics and Astronomy, 18 (4). pp. 295-301. ISSN 0250-6335

Ram Sagar, ; Gopal-Krishna, ; Wiita, Paul J. (1996) Intranight optical monitoring of optically selected bright quasars Monthly Notices of the Royal Astronomical Society, 281 (4). pp. 1267-1276. ISSN 0035-8711

Ram Sagar, (1996) Discovery of a planetary system around 51 Pegasus Bulletin of the Astronomical Soceity of India, 24 (1). pp. 5-6. ISSN 0304-9523

Barman, S. K. ; Ram Sagar, (1996) Influence of a third body on the luminosity of a contact binary system Bulletin of the Astronomical Society of India, 24 (1). pp. 47-58. ISSN 0304-9523

Gopal-Krishna, ; Ram Sagar, ; Wiita, Paul J. (1995) Intranight optical variability in optically selected QSOs Monthly Notices of the Royal Astronomical Society, 274 (3). pp. 701-710. ISSN 0035-8711

Ram Sagar, ; Cannon, R. D. (1994) UBVRI CCD photometry of the two Southern galactic star clusters Berkeley 79 and Trumpler 11 Bulletin of the Astronomical Society of India, 22 (4). pp. 381-401. ISSN 0304-9523

Gopal-Krishna, ; Ram Sagar, ; Wiita, Paul J. (1993) A search for intra-night optical variability in radio-quiet QSOs Monthly Notices of the Royal Astronomical Society, 262 (4). pp. 963-969. ISSN 0035-8711

Mohan, V. ; Pandey, A. K. ; Paliwal, D. C. ; Ram Sagar, ; Mahra, H. S. (1992) CCD photometry of the galactic open star clusters. I - King 10 Bulletin of the Astronomical Society of India, 20 (3-4). pp. 303-318. ISSN 0304-9523

Pandey, A. K. ; Mahra, H. S. ; Ram Sagar, (1992) Effect of mass segregation on mass function of young open clusters Bulletin of the Astronomical Society of India, 20 (3-4). pp. 287-295. ISSN 0304-9523

Ram Sagar, ; Griffiths, W. K. (1991) CCD photometry of the distant young open cluster NGC 7510 Monthly Notices of the Royal Astronomical Society, 250 (4). pp. 683-691. ISSN 0035-8711

Ram Sagar, ; Sharples, Ray M. (1991) Fibre spectroscopy and BV CCD photometry of the Southern open cluster NGC 3114 Astronomy & Astrophysics Supplement Series, 88 (1). pp. 47-62. ISSN 0365-0138

Bhatt, Harish C. ; Ram Sagar, (1991) Emission-line CCD imaging of three Southern symbiotic stars Journal of Astrophysics and Astronomy, 12 (2). pp. 111-117. ISSN 0250-6335

Jain, S. K. ; Bhatt, H. C. ; Ram Sagar, (1990) Measurements of linear polarization of some Herbig Ae/Be stars Astronomy & Astrophysics Supplement Series, 83 (2). pp. 237-244. ISSN 0365-0138

Ram Sagar, ; Yu, Qian Zhong (1990) Near-infrared photometric study of open star cluster IC 1805 The Astrophysical Journal, 353 (1). pp. 174-180. ISSN 0004-637X

Cannon, R. D. ; Ram Sagar, ; Hawkins, M. R. S. (1990) CCD photometry of the distant Southern globular cluster NGC 5824 Monthly Notices of the Royal Astronomical Society, 243 (1). pp. 151-158. ISSN 0035-8711

Pandey, A. K. ; Mahra, H. S. ; Ram Sagar, (1990) The young open star clusters: stability and structure The Astronomical Journal, 99 (2). pp. 617-621. ISSN 0004-6256

Ram Sagar, ; Hawkins, M. R. S. ; Cannon, R. D. (1990) The giant branch of the Fornax dwarf spheroidal galaxy Monthly Notices of the Royal Astronomical Society, 242 (1). pp. 167-176. ISSN 0035-8711

Surendiranath, R. ; Kameswara Rao, N. ; Ram Sagar, ; Nathan, J. S. ; Ghosh, K. K. (1990) CCD photometry in VRI bands of the galactic cluster NGC 2818 Journal of Astrophysics and Astronomy, 11 (2). pp. 151-166. ISSN 0250-6335

Ram Sagar, ; Yu, Qian Zhong (1989) JHK photometric study of the variable interstellar extinction in the direction of open star cluster NGC 654 Monthly Notices of the Royal Astronomical Society, 240 (3). pp. 551-561. ISSN 0035-8711

Ram Sagar, ; Bhatt, Harish C. (1989) Internal kinematics of open star clusters Monthly Notices of the Royal Astronomical Society, 236 . pp. 865-874. ISSN 0035-8711

Pandey, A. K. ; Bhatt, B. C. ; Mahra, H. S. ; Ram Sagar, (1989) Integrated parameters of open clusters Monthly Notices of the Royal Astronomical Society, 236 (1). pp. 263-276. ISSN 0035-8711

Ram Sagar, ; Bhatt, Harish C. (1989) Internal motions in the open star clusters NGC 654 and 6087 Bulletin of the Astronomical Society of India, 17 (1-2). pp. 1-5. ISSN 0304-9523

Ram Sagar, ; Bhatt, Harish C. (1989) Radial distribution of the integrated light and photometric colours in open star clusters Journal of Astrophysics and Astronomy, 10 (2). pp. 173-182. ISSN 0250-6335

Mohan, V. ; Ram Sagar, (1988) Field star contamination in open star cluster NGC 2301 Bulletin of the Astronomical Society of India, 16 (4). pp. 159-182. ISSN 0304-9523

Ram Sagar, ; Miakutin, V. I. ; Piskunov, A. E. ; Dluzhnevskaia, O. B. (1988) A study of the spatial stellar mass distribution in some young open clusters Monthly Notices of the Royal Astronomical Society, 234 (4). pp. 831-845. ISSN 0035-8711

Ram Sagar, ; Cannon, R. D. ; Hawkins, M. R. S. (1988) Photoelectric and electronographic photometry of the globular cluster NGC 1851 Monthly Notices of the Royal Astronomical Society, 232 (1). pp. 131-145. ISSN 0035-8711

Ram Sagar, ; Bhatt, Harish C. (1988) Kinematical distances to open star clusters Journal of Astrophysics and Astronomy, 9 (2). pp. 117-124. ISSN 0250-6335

Ram Sagar, (1988) Non-uniform extinction in ten young open clusters Vistas in Astronomy, 31 . pp. 503-506. ISSN 0083-6656

Ram Sagar, (1987) Study of interstellar extinction in some young open clusters Monthly Notices of the Royal Astronomical Society, 228 (2). pp. 483-499. ISSN 0035-8711

Joshi, U. C. ; Ram Sagar, (1986) UBV photoelectric photometry of the open cluster NGC 2539 Bulletin of the Astronomical Society of India, 14 (2). pp. 95-104. ISSN 0304-9523

Ram Sagar, (1985) The effect of Main-Sequence stars on age estimates of open clusters Astrophysics and Space Science, 113 (1). pp. 171-180. ISSN 0004-640X

Ram Sagar, ; Verma, R. C. (1984) Anomalous magnetic moments for uncharmed and charmed baryons Canadian Journal of Physics, 62 (2). pp. 123-125. ISSN 0008-4204

Ram Sagar, ; Joshi, U. C. (1981) Study of the galactic cluster NGC 6823 Astrophysics and Space Science, 75 (2). pp. 465-472. ISSN 0004-640X

Ram Sagar, ; Joshi, U. C. (1978) The gap in the H-R diagram of open clusters with special reference to NGC 2169, NGC 1778 and TR 1 Bulletin of the Astronomical Soceity of India, 6 (2). pp. 37-41. ISSN 0304-9523

Ram Sagar, ; Joshi, U. C. (1978) Study of the galactic cluster NGC 581 Bulletin of the Astronomical Soceity of India, 6 (1). pp. 12-16. ISSN 0304-9523

Joshi, U. C. ; Ram Sagar, (1977) Photoelectric photometry of the open cluster Tr-1 Astrophysics and Space Science, 48 (1). pp. 225-230. ISSN 0004-640X

Ram Sagar, (1976) Photometry of the galactic cluster NGC 2169 Astrophysics and Space Science, 40 (2). pp. 447-454. ISSN 0004-640X