Confirmation of the Luminous Blue Variable nature of AFGL 2298

Details Confirmation of the Luminous Blue Variable nature of AFGL 2298 Confirmation of the Luminous Blue Variable nature of AFGL 2298

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..653c&link_type=abstract

Astronomy and Astrophysics, v.403, p.653-658 (2003)

Astronomy and Astrophysics

Astrophysics

13

Stars: Emission-Line, Be, Stars: Circumstellar Matter

Scientific paper

We present new photometric and spectroscopic observations of the stellar source AFGL 2298 (= IRAS 18576+0341) that has recently been proposed as a candidate Luminous Blue Variable (LBV). Our data confirm that the star is a highly luminous B supergiant which is both spectroscopically and photometrically variable. Assuming a distance of 10 kpc, comparison of the 2001 June data to synthetic spectra suggest stellar parameters of T=12.5 kK, log(L/Lsun)=6.2 and dot M=5*E-5 Msun yr-1. Data obtained in 2002 August indicate an increase in both temperature (=15 kK) and mass loss rate (=1.2*E-4 Msun yr-1) at constant bolometric luminosity. These physical parameters place AFGL 2298 at the Humphreys-Davidson limit for the most luminous stars known. We conclude that the position of AFG 2298 in the HR diagram, the significant variability observed between 1999-2002 and presence of a massive ejection nebula are consistent with a classification of AFGL 2298 as a bona fide LBV.

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