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
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Official URL: http://adsabs.harvard.edu/abs/1988MNRAS.232..131S
Abstract
The colour-magnitude diagram for NGC 1851 is presented to a limit of V = 21.0 mag, approximately 2 mag below the main-sequence turn-off point, on the basis of UBV photoelectric photometry and electronographic BV photometry. The main-sequence turn-off parameters are (B-V)t = 0.40±0.03 mag; Vt = 19.45±0.1 mag. From the location of the horizontal branch stars, the apparent distance modulus to the cluster has been estimated as 15.45±0.2 mag. An age of 15±3 Gyr has been assigned to the cluster from the fitting of Vanden-Berg & Bell theoretical isochrones.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons. |
| Keywords: | Astronomical Photometry; Color-magnitude Diagram; Electronography; Electrophotometry; Globular Clusters; UBV Spectra; Astronomical Spectroscopy; Horizontal Branch Stars; Main Sequence Stars |
| ID Code: | 65957 |
| Deposited On: | 20 Oct 2011 06:18 |
| Last Modified: | 20 Oct 2011 06:18 |
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