Radial Velocity Variations In The Gamma-ray Binary HESS J0632+057

Details Radial Velocity Variations In The Gamma-ray Binary HESS J0632+057 Radial Velocity Variations In The Gamma-ray Binary HESS J0632+057

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915310m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #153.10

Astronomy and Astrophysics

Astronomy

Scientific paper

The TeV source HESS J0632+057 was recently found to exhibit X-ray flux variability with a period of 320 +/- 5 days. The time of X-ray maximum may correspond to periastron in this interacting binary, and it may be possible to detect radial velocity variations at this orbital phase. Here we present KPNO Coude Feed spectra of the proposed optical counterpart, HD 259440, during the Dec. 2011 X-ray maximum. We use the observed radial velocities to constrain the orbital geometry of the system and discuss the implications for the very high energy production.
We are grateful for support from NSF grant AST-1109247, the Sigma Xi Grant-in-Aid of Research program, and Lehigh University.

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