Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..111h&link_type=abstract
Astrophysical Journal, Part 1, vol. 213, Apr. 1, 1977, p. 111-120.
Astronomy and Astrophysics
Astronomy
14
Binary Stars, Light Curve, Oao 3, Satellite Observation, Ultraviolet Spectra, Variable Stars, Line Spectra, Spaceborne Astronomy, Stellar Luminosity, Stellar Spectra, Stellar Spectrophotometry
Scientific paper
Copernicus scans were made of the Beta Cephei stars Beta Cephei and Alpha Virginis, primarily to examine changes in the C IV 1550-A lines on time scales of days and lines near 1120 A on time scales of hours. In addition, count rates in the five detectors were used as a multichannel simultaneous photometer. The variation of light amplitude with wavelength is examined in Beta Cep and discussed in connection with the stellar parameters and the nature of the pulsation. A phase lag (van Hoof) effect is seen between lines in the 1100-A region in the spectrum of Beta Cep. The C IV lines in the spectrum of Beta Cep show variations over days which are not seen in other lines or in the spectrum of Alpha Vir. The Alpha Vir data put a limit on the secondary luminosity and may form the basis of a definitive orbital determination. Velocity and light changes show only marginal correlation with known short periods in Alpha Vir.
Hill Gary
Hutchings John B.
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