Fast Line-Profile Variability in the Spectra of O Stars

Details Fast Line-Profile Variability in the Spectra of O Stars Fast Line-Profile Variability in the Spectra of O Stars

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003astl...29..175k&link_type=abstract

Astronomy Letters, vol. 29, p. 175-187 (2003)

Astronomy and Astrophysics

Astronomy

11

Scientific paper

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 lambda Ori, alpha 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 H_alpha and C III lambda5696 lines in the spectrum of lambda Ori has been found for the first time. The variability amplitude is 4-5% for 19 Cep and 1-2% for alpha Cam and lambda Ori on time scales from several hours to 3 or 4 days, and the width of the variable features reaches 2 Angstroms (100 km/s). We detected cyclical variations in the He II lambda4686 and C III lambda5696 line profiles in the spectrum of lambda 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 H_alpha and He I lambda4715 line profiles in the spectrum of lambda Ori A.

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