Volume 403, Number 2, May IV 2003
|Page(s)||653 - 658|
|Section||Stellar structure and evolution|
|Published online||06 May 2003|
Confirmation of the Luminous Blue Variable nature of AFGL 2298
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, England, UK
2 Astronomical Institute of St. Petersburg University, Petrodvorets, Universitetsky pr. 28, 198504 St. Petersburg, Russia
3 Isaac Newton Institute of Chile, St. Petersburg Branch
4 US Air Force Research Laboratory, Space Vehicles Directorate, 29 Randolph Road, Hanscom AFB, MA 01731-3010, USA
5 Central Astronomical Observatory, 196140 St. Petersburg, Russia
Corresponding author: J. S. Clark, firstname.lastname@example.org
Accepted: 13 March 2003
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 kK, log and yr-1. Data obtained in 2002 August indicate an increase in both temperature (=15 kK) and mass loss rate (= 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.
Key words: stars: emission-line, Be / stars: circumstellar matter
© ESO, 2003
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