HRC Imaging of the `Fainted' Primary of the Alpha Centauri System

Details HRC Imaging of the `Fainted' Primary of the Alpha Centauri System HRC Imaging of the `Fainted' Primary of the Alpha Centauri System

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1874a&link_type=abstract

Chandra Proposal ID #06208228

Physics

Chandra Proposal Id #06208228

Scientific paper

The famous Alpha Centauri binary (G2V+K1V) has been regularly observed in X-rays since first resolved by Einstein 25 years ago, later by ROSAT/HRI, and more recently by XMM. The latest EPIC-pn imaging uncovered an extremely odd result: solar twin Alp Cen A has nearly disappeared in X-rays. This behavior had not been encountered in the previous quarter century of X-ray work on the system, and is quite unlike anything ever seen on the Sun, except perhaps the curious 18th-century "Maunder minimum," when sunspots vanished from the solar disk for decades at a time, and coronal activity likely was severely depressed; although, of course, we don't have any X-ray observations from then to confirm the true coronal behavior. The AB orbit now has closed below the resolution of EPIC, although still is easy for Chandra to separate. I therefore propose to continue the crucial X-ray time series on this important solar analog using Chandra's HRC-I.

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