Short Timescale Line Profile Variations in Spectra of OB Stars: the Case of ρ Leo
Abstract
The paper continues the study of superfast line profile variations (LPV) in spectra of early-type stars. The multimode focal reducer SCORPIO at the 6-meter telescope (BTA) was used to obtain 1271 low-resolution spectra of ρ Leo (B1 Iab). Regular LPVs for H I, He I, Fe II, N II, O II, Si III, and other ion lines with periods from ∼ 2 to ∼ 90 minutes and an amplitude of 1-2% of the continuum level are detected. Nonregular LPVs were also detected at time intervals less then a minute. The harmonics of LPVs with periods less than 10 minutes appear to be variable. During 128 minutes of observation their periods can change by ∼ 40%. Possible causes of such fast spectral variations are discussed.
- Publication:
-
Physics of Magnetic Stars
- Pub Date:
- July 2019
- Bibcode:
- 2019ASPC..518..153B