Chandra Hetgs Observations of Early B Supergiants

Details Chandra Hetgs Observations of Early B Supergiants Chandra Hetgs Observations of Early B Supergiants

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1140w&link_type=abstract

Chandra Proposal ID #04200415

Other

Chandra Proposal Id #04200415

Scientific paper

We are requesting Chandra HETGS observations of 2 early B supergiants, Epsilon Ori (B0Ia, 94 ks) and Kappa Ori (B0.5Ia, 125 ks). Although these stars are relatively X-ray bright, neither has been observed directly since the Einstein era. Our HETGS observations of these stars will extend our understanding of the He-like f/i line ratio dependence on UV flux by providing measurements of this ratio at lower UV flux levels. The diversity in their wind properties as compared to other OB stars will allow us to probe different stellar wind distributed X-ray source models and test the developing concept that the observed X-rays from OB stars are emerging from their associated X- ray "photospheres" (i.e., X-ray depth of unity).

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