Clark, J. S.; Larionov, V. M; Crowther, P. A.; Egan, M. P. and Arkharov, A.
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|DOI (Digital Object Identifier) Link:||http://doi.org/10.1051/0004-6361:20030389|
|Google Scholar:||Look up in Google Scholar|
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/L⊙)=6.2 and Ṁ=5xE-5 M⊙ yr-1. Data obtained in 2002 August indicate an increase in both temperature (=15 kK) and mass loss rate (=1.2xE-4 M⊙ 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|
|Copyright Holders:||2003 ESO|
|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)|
|Depositing User:||Astrid Peterkin|
|Date Deposited:||12 Feb 2009 16:39|
|Last Modified:||23 Feb 2016 21:16|
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