Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-11
Astronomy and Astrophysics
Astrophysics
9 pages, 3 figures, 3 tables. Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/379806
We present a study of the photometric variability of spectroscopically confirmed supergiants in NGC 300, comprising 28 epochs extending over a period of five months. We find 15 clearly photometrically variable blue supergiants in a sample of nearly 70 such stars, showing maximum light amplitudes ranging from 0.08 to 0.23 magnitudes in the V band, and one variable red supergiant. We show their light curves, and determine semi-periods for two A2 Ia stars. Assuming that the observed changes correspond to similar variations in the bolometric luminosity, we test for the influence of this variability on the Flux-weighted Gravity--Luminosity Relationship and find a negligible effect, showing that the calibration of this relationship, which has the potential to measure extragalactic distances at the Cepheid accuracy level, is not affected by the stellar photometric variability in any significant way.
Bresolin Fabio
Fouque' Pascal
Gieren Wolfgang
Kudritzki Rolf Peter
Pietrzynski Grzegorz
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