Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..143w&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 94, Feb. 1982, p. 143-148. Research supported by the Natural Sciences an
Astronomy and Astrophysics
Astronomy
10
B Stars, H Alpha Line, Spectral Line Width, Stellar Spectra, Stellar Spectrophotometry, Apsides, Helium, Orbits, Oxygen, Signal To Noise Ratios, Stellar Rotation
Scientific paper
Two, four and one-half hour spectral series are presented of high signal-to-noise ratio (approximately 800) of Spica for March 13, 1979, and April 14, 1981 (UT). It is noted that reticon arrays were used as detectors and that the spectra cover H-alpha and He I 6678 A. Distinct features (approximately 0.5% of the continuum level) that could be associated with nonradial Beta Cephei pulsation modes combined with stellar rotation are seen moving linearly through the He I and O II 6721 A lines of the primary with accelerations of approximately 0.007 km/s. Certain features appear to change during the series. The FWHM of the primary line is 255 km/s on both nights; this is much greater than anyone has measured before and is not compatible with the acceleration of the features and the known radius and inclination of the star. This is seen as implying that the primary line width is variable and not caused entirely by rotation.
Fahlman Gregory G.
Moyles K.
Walker Gordon A. H.
Yang Sheng
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