AAS 200th meeting, Albuquerque, NM, June 2002
Session 74. Stellar Atmospheres and Circumstellar Material
Display, Thursday, June 6, 2002, 9:20am-4:00pm, SW Exhibit Hall

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[74.12] Associates of Eta Car: New Insights

N.R. Evans, F.D. Seward, M.I. Krauss, J. Nichols, E.M. Schlegel, S.J. Wolk (Harvard-Smithsonian CfA), W.L. Waldron (L-3 Comm. Analytics)

The region around the \eta Car nebula contains several of the most massive stars known (O3 V stars). In addition it also contains objects which (probably) spell out an evolutionary progression from massive (O3 If) supergiants (HD 93129AB, Tr 16-244) to a WN6 Wolf-Rayet star (WR 25 = HD 93162), to \eta Car itself. We have used a Chandra ACIS-I X-ray image of the region surrounding \eta Car, including the clusters Tr 16 and Tr 14, to study the stars in this extremely young association. In particular, we discuss modeling of the X-ray spectra of a selection of these objects, together with hardness ratios. We also discuss optical photometry of the newly discovered population of cool star X-ray sources. Supported by funding from Chandra X-ray Center NASA Contract NAS8-39073

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Bulletin of the American Astronomical Society, 34
© 2002. The American Astronomical Soceity.