The Be Star HD 215227: A Candidate Gamma-ray Binary
arXiv:1009.4947 · doi:10.1088/2041-8205/723/1/L93
Abstract
The emission-line Be star HD 215227 lies within the positional error circle of the newly identified gamma-ray source AGL J2241+4454. We present new blue spectra of the star, and we point out the morphological and variability similarities to other Be binaries. An analysis of the available optical photometry indicates a variation with a period of 60.37 +/- 0.04 d, which may correspond to an orbital modulation of the flux from the disk surrounding the Be star. The distance to the star of 2.6 kpc and its relatively large Galactic latitude suggest that the binary was ejected from the plane by a supernova explosion that created the neutron star or black hole companion. The binary and runaway properties of HD 215227 make it an attractive candidate as the optical counterpart of AGL J2241+4454 and as a new member of the small class of gamma-ray emitting binaries.
14 pages, 3 figures, 1 table. Accepted for publication in ApJ Letters on September 24, 2010
References in corpus (10)
- A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
- TASS Mark IV Photometric Survey of the Northern Sky
- Accretion vs colliding wind models for the gamma-ray binary LS I +61 303: an assessment
- HESS J0632+057 : A new gamma-ray binary?
- Rotational Velocities For B0-B3 Stars in 7 Young Clusters: Further Study of the Relationship between Rotation Speed and Density in Star-Forming Regions
- AGILE detection of a strong gamma-ray flare from the blazar 3C 454.3
- Joint H-alpha and X-Ray Observations of Massive X-Ray Binaries. II. The Be X-ray Binary and Microquasar LS I +61 303
- Stellar Rotation in Field and Cluster B-Stars
- Gamma-ray binaries
- Gamma rays from compact binary system
Cited by in corpus (27)
- Be/X-ray binaries
- WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
- Gamma-ray binaries and related systems
- A Be-type star with a black hole companion
- A catalogue of high-mass X-ray binaries in the Galaxy: from the INTEGRAL to the Gaia era
- On the binary nature of the gamma-ray sources AGL J2241+4454 (=MWC 656) and HESS J0632+057 (=MWC 148)
- Large-scale flow dynamics and radiation in pulsar gamma-ray binaries
- Evidence for mass-dependent peculiar velocities in compact object binaries: Towards better constraints on natal kicks
- The First Simultaneous X-Ray/Radio Detection of the First Be/BH System MWC 656
- Discovery of X-ray emission from the first Be/black hole system
- On the origin of LS 5039 and PSR J1825-1446
- Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
- MWC 656 is unlikely to contain a black hole
- On the Neutron Star/Black Hole Mass Gap and Black Hole Searches
- Radio Emission from the Be/Black Hole Binary MWC 656
- Optical spectroscopy of Be/gamma-ray binaries
- Radio monitoring of transient Be/X-ray binaries and the inflow-outflow coupling of strongly-magnetized accreting neutron stars
- MAGIC observations of MWC 656, the only known Be/BH system
- The gamma-ray source AGL J2241+4454 as the possible counterpart of MWC 656
- INTEGRAL and Swift observations of the Be X-ray binary 4U 1036-56 (RX J1037.5-5647) and its possible relation with gamma-ray transients
- Decade-long X-ray observations of HESS J0632+057
- Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
- An updated gamma-ray analysis of the Be-BH binary HD~215227
- Optical spectroscopy of the Be/black hole binary MWC656 -- interaction of a black hole with a circumstellar disc
- Radius, rotational period and inclination of the Be stars in the Be/gamma-ray binaries MWC 148 and MWC 656
- Ultraviolet spectroscopy reveals a hot and luminous companion to the Be star+black hole candidate MWC 656
- Further evidence for natal kick segregation by spectral type in high-mass X-ray binaries