Article (Scientific journals)
HD 259440: The Proposed Optical Counterpart of the γ-ray Binary HESS J0632+057
Aragona, C.; McSwain, M. V.; De Becker, Michaël
2010In Astrophysical Journal, 724, p. 306-312
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Keywords :
binaries: general; stars: emission-line, Be; stars: fundamental parameters; stars: individual: HD 259440; HESS J0632+057
Abstract :
[en] HD 259440 is a B0pe star that was proposed as the optical counterpart to the γ-ray source HESS J0632+057. Here, we present optical spectra of HD 259440 acquired to investigate the stellar parameters, the properties of the Be star disk, and evidence of binarity in this system. Emission from the Hα line shows evidence of a spiral density wave in the nearly edge-on disk. We find a best-fit stellar effective temperature of 27,500-30,000 K and a log surface gravity of 3.75-4.0, although our fits are somewhat ambiguous due to scattered light from the circumstellar disk. We derive a mass of 13.2-19.0 M sun and a radius of 6.0-9.6 R sun. By fitting the spectral energy distribution, we find a distance between 1.1 and 1.7 kpc. We do not detect any significant radial velocity shifts in our data, ruling out orbital periods shorter than one month. If HD 259440 is a binary, it is likely a long-period (>100 d) system.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Aragona, C.
McSwain, M. V.
De Becker, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Language :
English
Title :
HD 259440: The Proposed Optical Counterpart of the γ-ray Binary HESS J0632+057
Publication date :
November 2010
Journal title :
Astrophysical Journal
ISSN :
0004-637X
eISSN :
1538-4357
Publisher :
University of Chicago Press, Chicago, United States - Illinois
Volume :
724
Pages :
306-312
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 November 2010

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