NDLI: Fast line-profile variability in the spectra of O stars

Content Provider	Springer Nature Link
Author	Kholtygin, A. F. Monin, D. N. Surkov, A. E. Fabrika, S. N.
Copyright Year	2003
Abstract	A program of the search for and analysis of profile variability in the spectra of bright O supergiants with a time resolution of 5–30 min is described. Preliminary results of the spectroscopic observations of the stars λ Ori, α Cam, and 19 Cep with the 1-m Special Astrophysical Observatory telescope in 2001 are presented. Line-profile variability was detected in the spectra of all the stars studied; variability in the Hα and C III λ5696 Å lines in the spectrum of λ Ori has been found for the first time. The variability amplitude is 4–5% for 19 Cep and 1–2% for α Cam and λ Ori on time scales from several hours to 3 or 4 days, and the width of the variable features reaches 2 Å (100 km s$^{−1}$). We detected cyclical variations in the He II λ4686 and C III λ5696 line profiles in the spectrum of λ Ori on time scales of 1.3–1.6 days. Rapid profile variations on time scales of 3.5–7 h were found in the violet parts of the Hα and He I λ4715 line profiles in the spectrum of λ Ori A.
Starting Page	175
Ending Page	187
Page Count	13
File Format	PDF
ISSN	10637737
Journal	Astronomy Letters
Volume Number	29
Issue Number	3
e-ISSN	15626873
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2003-01-01
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	stars, variable and peculiar hot stars line-profile variability Astronomy Astrophysics
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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