Line Variability in the Spectrum of Supergiant alpha Cam

Details Line Variability in the Spectrum of Supergiant alpha Cam Line Variability in the Spectrum of Supergiant alpha Cam

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004astl...30..332r&link_type=abstract

Astronomy Letters, vol. 30, p. 332-342 (2004)

Astronomy and Astrophysics

Astronomy

2

Scientific paper

CCD spectra taken with the PFES and CEGS echelle spectrographs attached to the 6-m Special Astrophysical Observatory (Russian Academy of Sciences) telescope and the 2-m Shamakha Astrophysical Observatory (National Academy of Sciences of Azerbaijan) telescope, respectively, were used to study the line-profile variations in the spectrum of the hot supergiant alpha Cam. No fast (<1.5 h) line-profile and radial-velocity variations were found. Some of the systematic effects that cause spurious variability are considered. The H-alpha profile variability appears symmetric relative to the radial velocity of the star's center of mass and is attributable to variable blueshifted and redshifted emission and/or absorption components superimposed on a variable photospheric profile. The H line shows evidence of a large-scale mass ejection from the stellar surface, which is also traceable in other spectral lines. The He II 4686 line exhibits an inverse P Cyg profile, while the red wing of the He I 5876 line shows weak and variable emission. The fast (on characteristic time scales of shorter than an hour) variability of the He II 4686 profile that was previously revealed by our observations (Kholtygin et al. 2000) is called into question. A comparison of the observational data on the variability of ultraviolet and optical line profiles for the supergiant alpha Cam suggests that nonradial motions are mainly responsible for the radial-velocity and line-profile variability.

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