A New Luminous Blue Variable in M31

作者：Humphreys Roberta M^*; Martin John C; Gordon Michael S

来源：Publications of the Astronomical Society of the Pacific, 2015, 127(950): 347-350.

DOI：10.1086/681013

We report the fifth confirmed Luminous Blue Variable/S Doradus variable in M31. In 2006, J004526.62+415006.3 had the spectrum of hot Fe II emission line star with strong P Cygni profiles in the Balmer lines. In 2010, its absorption line spectrum resembled an early A-type supergiant with H and Fe II emission lines with strong P Cygni profiles, and in 2013, the spectrum had fully transitioned to an F-type supergiant due to the formation of the optically thick, cool wind which characterizes LBVs at maximum light. The photometric record supports the LBV/S Doradus nature of the variability. Its bolometric luminosity of similar to - 9.65 mag places it on the H-R diagram near the known LBVs, AE And, Var C in M33, and S Dor.

• 出版日期2015-4