α TrA Junior
Abstract
The ``hybrid chromosphere'' star α Trianguli Australis (K2 Ib-IIa) displays atypical coronal properties for its class: elevated soft X-ray emission, flare outbursts, and a superhot (T~10 MK) spectrum. The Wide Field Planetary Camera 2 (WFPC2) on board the Hubble Space Telescope (HST) now has found a faint object close to the red supergiant, 0.4" nearly due south and about 1% its intensity in the F160BW ultraviolet filter, consistent with a G0 dwarf. Potentially, the ``young sun'' companion to the massive primary could completely dominate the coronal luminosity. The X-ray centroid in a contemporaneous Chandra High-Resolution Camera (HRC) pointing is offset in the direction of the faint UV secondary, but measurements of the radio counterpart of a serendipitous X-ray source 12" southeast (SE) of α TrA, obtained with the Australia Telescope Compact Array (ATCA), suggest a conflicting offset.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- April 2007
- DOI:
- 10.1086/514818
- Bibcode:
- 2007ApJ...658L.107A
- Keywords:
-
- Stars: Coronae;
- stars: individual (HD 150798);
- X-Rays: Stars