A New Luminous Blue Variable in M31
Roberta M. Humphreys, John C. Martin, and Michael S. Gordon

TL;DR
This paper reports the discovery and spectral evolution of a new Luminous Blue Variable in M31, illustrating its transition through different spectral types and confirming its LBV status based on photometric and spectroscopic data.
Contribution
It presents the identification and detailed spectral evolution of the fifth confirmed LBV in M31, expanding understanding of LBV variability and characteristics.
Findings
Spectral transition from hot to cool supergiant observed
Photometric data supports LBV/S Dor classification
Bolometric luminosity consistent with known LBVs
Abstract
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 Dor nature of the variability. Its bolometric luminosity ~ -9.65 mag places it on the HR Diagram near the known LBVs, AE And, Var C in M33 and S Dor.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
