Physics
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2777r&link_type=abstract
Chandra proposal ID #11200609
Physics
Scientific paper
We propose to observe the low activity star Altair with the Chandra LETGS. With a spectral type of A7, the very fast rotator Altair is the earliest, magnetically active, single late-type star detected by ROSAT and Einstein. Its X-ray luminosity is low and the activity level as expressed by the L_X/L_bol ratio is the lowest measured in any nearby star. Being located at a distance of only 5 pc, Altair is a unique target to study the X-ray properties of late A-type stars in greater detail. The proposed 100 ks observation will enable us to investigate the cool corona of a star with a very shallow convection zone in this spectral range. We expect to measure rotationally broadened stellar emission lines in the X-ray regime for the first time.
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