Photometric variability of B- and A-type supergiants

Details Photometric variability of B- and A-type supergiants Photometric variability of B- and A-type supergiants

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..491p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Aug. 1983, p. 491-505.

Astronomy and Astrophysics

Astronomy

36

A Stars, Astronomical Photometry, Early Stars, O Stars, Supergiant Stars, Variable Stars, Light Curve, Tables (Data)

Scientific paper

Photometric observations of 16 early-type (O9 to A3) supergiants have been obtained. All but two of the stars are variable, with a range of about 0.05 mag. The light curves are irregular, but characteristic time scales or 'quasi-periods' can be identified. The ratio of the quasi-period to the theoretical period (for pulsation in the fundamental radial mode) varies from 2-10 in the earliest-type supergiants to 0.2-2 in the later-type supergiants. The variability is most likely due to nonradial pulsation, at least in the O-B-type supergiants.

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