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Wray 15-906 low mass Luminous Blue Variable in a pre-supernova stage

Published online by Cambridge University Press:  29 August 2024

O. Maryeva Open the ORCID record for O. Maryeva [Opens in a new window] ,
V. Gvaramadze ,
A. Kniazev  and
L. Berdnikov
O. Maryeva*
Affiliation:
Astronomical Institute, Czech Acad. Sci., Fričova 298, 25165 Ondřejov, Czech Republic
V. Gvaramadze
Affiliation:
Sternberg Astronomical Institute, MSU, Universitetsky pr., 13, Moscow, 119992, Russia
A. Kniazev
Affiliation:
Sternberg Astronomical Institute, MSU, Universitetsky pr., 13, Moscow, 119992, Russia South African Astronomical Observatory, 7935 Observatory, Cape Town, South Africa Southern African Large Telescope Foundation, 7935 Observatory, Cape Town, South Africa
L. Berdnikov
Affiliation:
Sternberg Astronomical Institute, MSU, Universitetsky pr., 13, Moscow, 119992, Russia
*
email: olga.maryeva@gmail.com
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Abstract

The evolutionary link between Red Supergiants and Luminous Blue variables is interesting, but still poorly understood. We present the results of a study of the Galactic candidate luminous blue variable Wray 15-906, revealed via the detection of its infrared circumstellar shell (of ≍2 pc in diameter) with the Wide-field Infrared Survey Explorer (WISE) and the Herschel Space Observatory. Using the stellar atmosphere code CMFGEN and the Gaia parallax, we found that Wray 15-906 is a relatively low-luminosity, log(L/Lȯ) ≍ 5.4, star with a temperature of 25±2 kK. In the framework of single star evolution, the obtained results suggest that Wray 15-906 is a post-red supergiant star with an initial mass of ≍ 25Mȯ and that before exploding as a supernova it could transform for a short time into a WN11h star. The presence of a shell with a mass 2.9±0.5Me indicates that Wray 15-906 has suffered substantial mass loss in the recent past.

Keywords

stars: evolutionstars: atmospherescircumstellar matter
Type
Poster Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S361: Massive Stars Near and Far , May 2022 , pp. 460 - 461
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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References

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