Hα Emission Variability in the γ-ray Binary LS I +61 303

Details Hα Emission Variability in the γ-ray Binary LS I +61 303 Hα Emission Variability in the γ-ray Binary LS I +61 303

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1010m&link_type=abstract

American Astronomical Society, HEAD meeting #11, #10.10; Bulletin of the American Astronomical Society, Vol. 41, p.670

Astronomy and Astrophysics

Astronomy

Scientific paper

LS I +61 303 is one of the brightest γ-ray sources in the sky and a member of the rare class of γ-ray binaries. The system consists of a B0 Ve optical star and an unknown compact companion interacting during their tightly bound, eccentric orbit and producing orbital-phase modulated emission across the electromagnetic spectrum. Here we present new optical spectra of LS I +61 303 from the KPNO Coude Feed telescope that reveal the evolution of the Hα emission during a full orbital cycle. Both the Be star's circumstellar disk and a second emission source contribute to the variability of the Hα line profile, and we investigate previous claims that the second source is associated with an accretion disk in the system.
We gratefully acknowledge support from NASA and Lehigh University.

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