Hα emission variability in the γ-ray binary LS I+61 303

被引：0
作者：
McSwain, M. Virginia [1 ]
Grundstrom, Erika D. [2 ]
Gies, Douglas R. [3 ,4 ]
Ray, Paul S. [5 ]
机构：
[1] Lehigh Univ, Dept Phys, Bldg 16, Bethlehem, PA 18015 USA
[2] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA
[3] Georgia State Univ, Ctr High Angular Resolut Astron, Atlanta, GA 30303 USA
[4] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA
[5] Naval Res Lab, Div Space Sci, Washington, DC 20375 USA
来源：
ACTIVE OB STARS: STRUCTURE, EVOLUTION, MASS-LOSS, AND CRITICAL LIMITS | 2011年 / 272期
关键词：
accretion; accretion disks; stars: winds; outflows; stars: emission-line; Be; stars: individual (LS I+61 303);
D O I：
10.1017/S174392131101129X
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
LS I +61 303 is an exceptionally rare example of a Be/X-ray binary that also exhibits MeV-TeV emission, making it one of only a handful of "gamma-ray binaries". Here we present Ha spectra that show strong variability during the 26.5 clay orbital period and over decadal time scales. The Ha line profile exhibits a dramatic emission burst shortly before apastron, observed as a redshifted shoulder in the line profile, as the compact source moves almost directly away from the observer. Here we investigate several possible origins for this red shoulder, including an accretion disk, tidal mass transfer stream, turbulent gas in the wake of the neutron star, and a, compact pulsar wind nebula in the system.
引用
收藏
页码：525 / +
页数：2
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