Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542712g&link_type=abstract
American Astronomical Society, AAS Meeting #215, #427.12; Bulletin of the American Astronomical Society, Vol. 42, p.344
Astronomy and Astrophysics
Astronomy
Scientific paper
The star α Cru is an early B type subgiant star recently observed by the Chandra Space Telescope. This star is of particular interest due to the observed x-ray emission produced by shocks that form in the stellar wind. We observe hydrogen like O VIII and helium like O VII spectral lines in the Low Energy Transmission Grating spectrum. The O VII produces characteristic triplet line. We provide an analysis of the helium like triplet that explains the conditions in the stellar wind where that line emission is formed. α Cru is also an ultraviolet bright star, so an International Ultraviolet Explorer observation is used to explain the effect of ultraviolet pumping on the forbidden component of the α triplet line. The data appear basically consistent with theoretical models of shocks in stellar winds by Owocki, Caster, & Rybicki (1988) and Feldmeier et al. (1997).
This project was funded by a partnership between the National Science Foundation (NSF AST-0552798), Research Experiences for Undergraduates (REU), and the Department of Defense (DoD) ASSURE (Awards to Stimulate and Support Undergraduate Research Experiences) programs.
Gorski Mark
Ignace Richard
Oskinova Lidia
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