TY - JOUR

T1 - Fast line-profile variability in the spectra of O stars

AU - Kholtygin, A. F.

AU - Monin, D. N.

AU - Surkov, A. E.

AU - Fabrika, S. N.

PY - 2003/3/1

Y1 - 2003/3/1

N2 - A program of the search for and analysis of profile variability in the spectra of bright O super-giants 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.

AB - A program of the search for and analysis of profile variability in the spectra of bright O super-giants 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.

KW - Hot stars

KW - Line-profile variability

KW - Stars, variable and peculiar

UR - http://www.scopus.com/inward/record.url?scp=0037361523&partnerID=8YFLogxK

U2 - 10.1134/1.1558157

DO - 10.1134/1.1558157

M3 - Article

AN - SCOPUS:0037361523

VL - 29

SP - 175

EP - 187

JO - Astronomy Letters

JF - Astronomy Letters

SN - 1063-7737

IS - 3

ER -