Reference : HD 259440: The Proposed Optical Counterpart of the γ-ray Binary HESS J0632+057
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75255
HD 259440: The Proposed Optical Counterpart of the γ-ray Binary HESS J0632+057
English
Aragona, C. [ > > ]
McSwain, M. V. [ > > ]
De Becker, Michaël mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Nov-2010
Astrophysical Journal
University of Chicago Press
724
306-312
Yes (verified by ORBi)
International
0004-637X
Chicago
IL
[en] binaries: general ; stars: emission-line, Be ; stars: fundamental parameters ; stars: individual: HD 259440 ; HESS J0632+057
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/75255
10.1088/0004-637X/724/1/306
http://adsabs.harvard.edu/abs/2010ApJ...724..306A

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
hess.pdfAuthor preprint1.2 MBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.