Burn Out or Fade Away? Probing the X-ray Death of Intermediate Mass Stars

Details Burn Out or Fade Away? Probing the X-ray Death of Intermediate Mass Stars Burn Out or Fade Away? Probing the X-ray Death of Intermediate Mass Stars

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1708d&link_type=abstract

American Astronomical Society, HEAD meeting #11, #17.08; Bulletin of the American Astronomical Society, Vol. 41, p.683

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Intermediate mass stars appear to be X-ray bright in their young, Herbig Ae phase, shining at 10^31 ergs/s or so. But things go awry in X-rays for these stars at a young age. In only a few million years, the dazzling X-rays of youth decay at least 100,000 fold, rendering main-sequence A stars among the most X-ray dim stars known. They are insufficiently luminous to produce massive radiatively-driven winds and also lack convection zones: they lie in a transition regime in the H-R diagram between stars that are able to produced X-rays by either of the above mechanisms. Here we describe a Chandra attempt to detect X-rays from HR 4796A, an 8 Myr old early A-type star with a dusty disk likely in its epoch of planet formation. We combine these data with other Chandra observations to probe the mysterious X-ray death of intermediate mass stars.

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