H-alpha Emission Variability in the gamma-ray Binary LS I +61 303

Details H-alpha Emission Variability in the gamma-ray Binary LS I +61 303 H-alpha Emission Variability in the gamma-ray Binary LS I +61 303

2010-09-11

arxiv.org/abs/1009.2173v1

Astrophys.J.724:379-385,2010

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

Accepted to ApJ

Scientific paper

10.1088/0004-637X/724/1/379

LS I +61 303 is an exceptionally rare example of a high mass X-ray binary (HMXB) that also exhibits MeV-TeV 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 time scales. 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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