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Complex Pulsation-Like Variability of the LBV Star v532 in M33

Published online by Cambridge University Press:  12 April 2016

O. Sholukhova ,
A. Zharova ,
S. Fabrika  and
D. Malinovskii
O. Sholukhova
Affiliation:
Special Astrophysical Observatory, Russia
A. Zharova
Affiliation:
Sternberg Astronomical Institute, Russia
S. Fabrika
Affiliation:
Special Astrophysical Observatory, Russia
D. Malinovskii
Affiliation:
Special Astrophysical Observatory, Russia

Abstract

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We present an analysis of a light curve of LBV star v532 (Romano’s star) in M33. The data consist of 881 individual photographic observations from 1960 to 2000. The star shows extremely rich periodic variations. We find that the amplitudes of the periods depend on brightness, as they rise when the star becomes brighter. We suggest that the 13.08-day period corresponds to the star’s rotation, other short periods (∼ 20 – 30 days) represent the star’s pulsations, and the longer periods are instability driven wind pulsations. The spectral variability of v532 is also strong, with the spectrum excitation depending on the stellar brightness.

Type
Part 5. Mass Loss in Pulsating Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 522 - 523
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

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