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Confirmation of the Luminous Blue Variable nature of AFGL 2298

Clark, James; Larionov, V. M; Crowther, P. A.; Egan, M. P. and Arkharov, A. (2003). Confirmation of the Luminous Blue Variable nature of AFGL 2298. Astronomy and Astrophysics, 403 pp. 653–658.

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DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361:20030389
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Abstract

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.

Item Type: Journal Article
ISSN: 1432-0746
Keywords: stars: emission-line, Be -- stars: circumstellar matter
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 13152
Depositing User: Astrid Peterkin
Date Deposited: 12 Feb 2009 16:39
Last Modified: 07 Feb 2012 20:38
URI: http://oro.open.ac.uk/id/eprint/13152
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