Open AccessWray 15-906 low mass Luminous Blue Variable on a pre-supernova stage
Author(s) -
O. V. Maryeva,
V. Gvaramadze,
A. Kniazev,
L. Berdnikov
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.059
Subject(s) - red supergiant , supergiant , physics , luminous blue variable , astrophysics , luminosity , supernova , astronomy , blue supergiant , stellar evolution , observatory , stars , galaxy
Evolutionary link between Red Supergiants and Luminous Blue variables is interesting, but still poorly understood. Wepresent the results of study of the Galactic candidate luminous blue variable Wray 15-906, revealed via detection of itsinfrared circumstellar shell (of ≈ 2 pc in diameter) with the Wide-eld Infrared Survey Explorer (WISE) and the HerschelSpace Observatory. Using the stellar atmosphere code CMFGEN and the Gaia parallax, we found that Wray 15-906 is arelatively low-luminosity, log(L/L ⊙ ) ≈ 5.4, star of 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 initial mass of ≈ 25 M ⊙ and that beforeexploding as a supernova it could transform for a short time into a WN11h star. The presence of shell with mass 2.9±0.5 M ⊙indicates that Wray 15-906 has suered substantial mass loss in the recent past.