Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..141p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 141-150
Astronomy and Astrophysics
Astrophysics
27
A Stars, H Alpha Line, H Beta Line, Line Spectra, Pre-Main Sequence Stars, Shell Stars, Stellar Envelopes, Stellar Mass, Stellar Spectra, Variations, Absorption Spectra, Astronomical Spectroscopy, Charge Coupled Devices, Emission Spectra, Stellar Winds, Visible Spectrum
Scientific paper
The results of the H-alpha and H-beta line profile investigation of an A0-shell star HD 163296 are presented. 47 high-resolution CCD spectra (35 for H-alpha and 12 for H-beta) were obtained on July 15-20, 1991 and on July 24-27, 1992. A considerable profile variability is found on time scales from one hour to a few days. The main properties of the night-to-night variations are strong change in shape of the entire line profile with the exception of the primary PCyg-absorption which remains relatively constant both in strength and in position. Two types of extremely rapid variations (tau approximately equal hours) are discovered: (a) positional shift of sharp spectral bumps, and (b) monotonous flux variations of different parts of a profile during a night. A qualitative explanation in the framework of the model for an envelope containing an active non-stable region formed by an equatorially concentrated stellar wind and an external cool shell is proposed for the observed variability. Some reasons for the extremely rapid profile changes are considered.
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