A Flaring X-ray Source with an Halpha-bright Counterpart toward the SMC
arXiv:0811.1662 · doi:10.1088/0004-637X/701/1/12
Abstract
We report the discovery of a flaring X-ray source with an optical counterpart with Halpha emission and red-excess, in the direction of the SMC. A 100 ksec X-ray observation with Chandra detected a flare lasting 6 ksec in the source CXO J005428.9-723107. The X-ray spectrum during the flare was consistent with a thermal plasma of temperature kT=2.5 keV. In quiescence following the flare the spectrum was softer (kT= 0.4 keV). Timing analysis did not reveal any significant periodicities or QPOs. Optical images taken with the Magellan-Baade 6.5m telescope show a single star in the (0.9") error circle. This star has apparent magnitude V=19.17, exhibits enhanced Halpha emission (Halpha - r = -0.88), and has a large proper motion. Alternative explanations are explored, leading to identification as a relatively nearby (Galactic) coronally active star of the BY Draconis class.
7 pages, 5 figures, submitted to ApJ
References in corpus (10)
- Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
- A UBVR CCD Survey of the Magellanic Clouds
- Past and present star formation in the SMC: NGC 346 and its neighborhood
- X-ray Processing of ChaMPlane Fields: Methods and Initial Results for Selected Anti-Galactic Center Fields
- New spectral classification technique for X-ray sources: quantile analysis
- A Long Look at the Be/X-Ray Binaries of the Small Magellanic Cloud
- Spectral distribution of Be/X-ray binaries in the Small Magellanic Cloud
- X-Ray Flaring on the dMe Star, Ross 154
- ChaMPlane Optical Survey: Mosaic Photometry
- Three active M dwarfs within 8 pc: L 449-1, L 43-72, & LP 949-15
Cited by in corpus (3)
- Exploring the Small Magellanic Cloud to the Faintest X-ray Fluxes: Source Catalog, Timing and Spectral Analysis
- The X-ray Binary Population of the Nearby Dwarf Starburst Galaxy IC 10: Variable and Transient X-ray Sources
- Contemporaneous XMM-Newton investigation of a giant X-ray flare and quiescent state from a cool M-class dwarf in the local cavity