Line-profile microvariability in OB-star spectra: the Supergiant λ Cep (O6If(n))

Details Line-profile microvariability in OB-star spectra: the Supergiant λ Cep (O6If(n)) Line-profile microvariability in OB-star spectra: the Supergiant λ Cep (O6If(n))

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011arep...55.1105k&link_type=abstract

Astronomy Reports, Volume 55, Issue 12, pp.1105-1114

Astronomy and Astrophysics

Astronomy

Scientific paper

We observed the bright O6If(n) supergiant λ Cep in 1997 with the 6-m optical telescope of the Special Astrophysical Observatory and in 2007 with the 1.8-m telescope of the Bohyunsan Optical Astronomy Observatory (South Korea). A total of 90 spectra of the star were acquired, with good time resolution (10 minutes), signal-to-noise ratios 150-300, and spectral resolutions of 45 000-60 000. We detected line-profile variations of H, HeI, and HeII lines. It is suggested that the detected variations are due to non-radial photospheric pulsations and the star's rotation (rotational profile modulation).

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