Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001tysc.confe.162w&link_type=abstract
Two Years of Science with Chandra, Abstracts from the Symposium held in Washington, DC, 5-7 September, 2001, meeting abstract.
Astronomy and Astrophysics
Astronomy
Normal Stars And White Dwarfs
Scientific paper
With one or two exceptions, existing measurements of stellar winds do not extend below a few times 10-10 Msolar/year--four orders of magnitude higher than the solar mass loss rate--and only apply to high-mass O and B stars, red giants, and supergiants. In recent work we suggested that observation of distinctively profiled X-ray halos arising from charge transfer between highly-charged ions in stellar winds and neutral gas in the surrounding interstellar medium can be used to study the winds and astrospheres around nearby dwarf stars. In the first application of this idea, we have deduced an upper limit for the mass loss rate of the nearby M dwarf Proxima Centauri based on two ACIS-S observations totaling 58 ksec. Using pulse height spectra, we have also obtained an estimate of Prox Cen's coronal metallity and have examined some properties of a prominent flare that occured during the observations.
Drake Jeremy J.
Wargelin Bradford J.
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