Optical spectrum variations of IL Cep A
- Authors: Ismailov N.Z.1, Khalilov O.V.1, Bakhaddinova G.R.1
- 
							Affiliations: 
							- N. Tusi Shamakha Astrophysical Observatory
 
- Issue: Vol 60, No 2 (2016)
- Pages: 265-279
- Section: Article
- URL: https://journals.rcsi.science/1063-7729/article/view/189728
- DOI: https://doi.org/10.1134/S1063772916020037
- ID: 189728
Cite item
Abstract
The results of many-year uniform spectroscopic observations of the Herbig Ae/Be star IL Cep A are presented. Its Hα line has either a single or a barely resolved two-component emission profile. The Hβ emission line is clearly divided into two components with a deep central absorption. Smooth variations of the observed parameters of individual spectral lines over nine years are observed. The He I λ5876 Å line has a complex absorption profile, probably with superposed emission components. The NaI D1, D2 doublet exhibits weak changes due to variations in the circumstellar envelope. The variations observed in the stellar spectrum can be explained by either binarity or variations of the magnetic field in the stellar disk. Difficulties associated with both these possibilities are discussed.
About the authors
N. Z. Ismailov
N. Tusi Shamakha Astrophysical Observatory
							Author for correspondence.
							Email: ismailovn@yahoo.com
				                					                																			                												                	Azerbaijan, 							Shamakha region, 373243						
O. V. Khalilov
N. Tusi Shamakha Astrophysical Observatory
														Email: ismailovn@yahoo.com
				                					                																			                												                	Azerbaijan, 							Shamakha region, 373243						
G. R. Bakhaddinova
N. Tusi Shamakha Astrophysical Observatory
														Email: ismailovn@yahoo.com
				                					                																			                												                	Azerbaijan, 							Shamakha region, 373243						
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