期刊
ASTROPHYSICAL JOURNAL
卷 724, 期 1, 页码 379-385出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/724/1/379
关键词
accretion, accretion disks; stars: emission-line, Be; stars: individual (LS I+61 303); stars: winds, outflows
资金
- NASA [NNX08AV70G, NNG08E1671, NNX09AT67G]
- Lehigh University
- National Science Foundation [AST-0506573, AST-0606861]
- NASA [NNX09AT67G, 107168, NNX08AV70G, 94958] Funding Source: Federal RePORTER
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009080] Funding Source: National Science Foundation
LS I +61 303 is an exceptionally rare example of a high-mass X-ray binary that also exhibits McV-TcV emission, making it one of only a handful of gamma-ray binaries. Here we present H alpha spectra that show strong variability during the 26.5 day orbital period and over decadal timescales. We detect evidence of a spiral density wave in the Be circumstellar disk over part of the orbit. The H alpha line profile also 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. We investigate several possible origins for this red shoulder, including an accretion disk, mass-transfer stream, and a compact pulsar wind nebula that forms via a shock between the Be star's wind and the relativistic pulsar wind.
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