The Ups and Downs of Alpha Centauri

Details The Ups and Downs of Alpha Centauri The Ups and Downs of Alpha Centauri

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2756a&link_type=abstract

Chandra proposal ID #11200063

Computer Science

Scientific paper

Nearby Alpha Centauri hosts two of the best characterized late-type dwarfs, besides the Sun itself; thanks to the accurate orbit, resolved angular diameters, and well understood co-evolutionary state. The G and K components of the system have X-ray measurements extending back to the late-1970's; in some sense superior to the solar high-energy irradiance. The latter is not routinely measured in the normal cosmic energy bands, and must be reconstructed from proxies. The present proposal is to continue this ongoing twin coronal narrative with additional HRC-I pointings in Cycle 11, including an attempt to assess the importance of rotational modulation effects. FUV spectroscopy by HST-COS will leverage the unique coronal activity record.

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