Chandra's Darkest Bright Star: not so Dark after All?

Details Chandra's Darkest Bright Star: not so Dark after All? Chandra's Darkest Bright Star: not so Dark after All?

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aj....136.1810a&link_type=abstract

The Astronomical Journal, Volume 136, Issue 5, pp. 1810-1814 (2008).

Astronomy and Astrophysics

Astronomy

1

Stars: Individual: Hd 172167, X-Rays: Stars

Scientific paper

The Chandra High Resolution camera (HRC) has obtained numerous short exposures of the ultraviolet (UV)-bright star Vega (α Lyrae; HD 172167: A0 V), to calibrate the response of the detector to out-of-band (non-X-ray) radiation. A new analysis uncovered a stronger "blue leak" in the imaging section (HRC-I) than reported in an earlier study of Vega based on a subset of the pointings. The higher count rate—a factor of nearly 2 above prelaunch estimates—raised the possibility that genuine coronal X-rays might lurk among the out-of-band events. Exploiting the broader point-spread function of the UV leak compared with soft X-rays identified an excess of counts centered on the target, technically at 3σ significance. A number of uncertainties, however, prevent a clear declaration of a Vegan corona. A more secure result would be within reach of a deep uninterrupted HRC-I pointing.

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