HD 259440: THE PROPOSED OPTICAL COUNTERPART OF THE γ-RAY BINARY HESS J0632+057

被引：43

作者：

Aragona, Christina ^{[1
]}

McSwain, M. Virginia ^{[1
]}

De Becker, Michael ^{[2
,3
]}

机构：

[1] Lehigh Univ, Dept Phys, Bethlehem, PA 18015 USA

[2] Univ Liege, Inst Astrophys & Geophys, B-4000 Liege, Belgium

[3] Observ Haute Provence, F-04870 St Michel Lobservatoire, France

来源：

ASTROPHYSICAL JOURNAL | 2010年 / 724卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

binaries: general; stars:; emission-line; Be; stars: fundamental parameters; individual; (HD; 259440; HESS J0632+057); BLANKETED MODEL ATMOSPHERES; O-TYPE STARS; NGC; 2244; PHOTOMETRY; MONOCEROS; DISCOVERY; NGC-2244; EMISSION; ROTATION; 2MASS;

D O I：

10.1088/0004-637X/724/1/306

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

HD 259440 is a B0pe star that was proposed as the optical counterpart to the gamma-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 H alpha 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(circle dot) and a radius of 6.0-9.6 R(circle dot). 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.

引用

页码：306 / 312

页数：7

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