Mathew, Blesson ; Banerjee, D. P. K. ; Subramaniam, A. ; Ashok, N. M. (2012) A study of the role of Lyβ fluorescence on OI line strengths in Be stars The Astrophysical Journal, 753 (1). Article ID 13 -8 pages. ISSN 0004-637X
|
PDF
392kB |
Official URL: http://iopscience.iop.org/article/10.1088/0004-637...
Related URL: http://dx.doi.org/10.1088/0004-637X/753/1/13
Abstract
The possibility of the Lyβ fluorescence mechanism being operational in classical Be (CBe) stars and thereby contributing to the strength of the OI λ8446 line has been recognized for long. However, this supposition needs to be quantified by comparing observed and predicted OI line ratios. In the present work, optical and near-infrared spectra of CBe stars are presented. We analyze the observed strengths of the OI λ7774, λ8446, λ11287, and λ13165 lines, which have been theoretically proposed as diagnostics for identifying the excitation mechanism. We have considered and examined the effects of Lyβ fluorescence, collisional excitation, recombination, and continuum fluorescence on these OI line strengths. From our analysis it appears that the Lyβ fluorescence process is indeed operative in Be stars.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Institute of Physics. |
| Keywords: | Atomic Processes; Circumstellar Matter; Infrared: Stars; Line: Formation; Stars: Emission-Line, Be; Techniques: Spectroscopic |
| ID Code: | 106582 |
| Deposited On: | 01 Feb 2018 12:04 |
| Last Modified: | 01 Feb 2018 12:04 |
Repository Staff Only: item control page
