PHOTOMETRIC VARIABILITY OF B- AND A- TYPE SUPERGIANTS

PHOTOMETRIC VARIABILITY OF B- AND A- TYPE SUPERGIANTS

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 0ṃ05. The light curves are irregular, but characteristic time scales or "quasi-periods" can be identified. The ratio of the quasi-period to the...

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Veröffentlicht in:Publications of the Astronomical Society of the Pacific 1983-08, Vol.95 (570), p.491-505
Hauptverfasser: PERCY, JOHN R., WELCH, DOUGLAS L.
Format: Artikel
Sprache:eng
Schlagworte:
Astronomical photometry
Astronomy
Autocorrelation
Comparison stars
Earth, ocean, space
Exact sciences and technology
Light curves
Normal stars (by class): general or individual
Observational astronomy
Radial pulsations
Radiation variability
Stars
Supergiant stars
Variable stars
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Zusammenfassung: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 0ṃ05. 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.
ISSN:0004-6280
1538-3873
DOI:10.1086/131198