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Paper: Parameters of the LBV Star V 532 in M33
Volume: 510, Stars: From Collapse to Collapse
Page: 474
Authors: Sarkisyan, A.; Sholukhova, O.; Fabrika, S.; Valeev, A.
Abstract: We present the results of spectroscopic study of the LBV (luminous blue variable) star V 532 in the galaxy M33 carried out with the SAO RAS telescope from 2009 to 2015. On the basis of these data and other photometric data, we produce spectral energy distributions (SED) of the star. From 1992 to 2015, its B-band stellar magnitude changed from 16.2 to 18.6. The spectrum also changed considerably. Assuming that bolometric luminosity of LBV stars is constant (this property is inherent for LBV stars), we used SEDs to determine the star temperature and radius in different states and the value of interstellar extinction. From 1992 to 2015, the star temperature changed from ≈15000 K to ≈40000 K, the radius changed from ≈150R to ≈20R respectively. The value AV is 0.6±0.1. The absolute bolometric stellar magnitude is –10.2±0.2.
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