Computer Science
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007cxo..prop.2739s&link_type=abstract
Chandra proposal ID #09208314
Computer Science
Scientific paper
In a 50 ksec XMM pointing we found a X-ray flux drop of >20 (compared to ROSAT) for 51 Peg, the most famous planet-bearing host star. 51 Peg is of very low activity and its chromospheric flux has been stable over many years. A dramatic (downward) change in soft X-ray flux has never been observed before in any star with the possible exception of Alpha Cen. It is important to check how long this extremely low activity state of 51 Peg persists. The X-ray surface flux derived from the XMM lies more than one order of magnitude below expectation. A possible solution is a coronal temperature change. An HRC pointing with its larger low energy sensitivity will show if there is undetected flux in the 0.1-0.2 keV band or if 51 Peg's corona has almost completely disappeared from the X-ray world.
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