Critical STIS Spectroscopy and ACS Imagery at the Top of the IMF

Details Critical STIS Spectroscopy and ACS Imagery at the Top of the IMF Critical STIS Spectroscopy and ACS Imagery at the Top of the IMF

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10205w&link_type=abstract

HST Proposal ID #10205

Computer Science

Hst Proposal Id #10205 Hot Stars

Scientific paper

We shall observe two key massive hot stars to investigate the effects of multiplicity and rotational mixing on their parameters and evolution. {1} The prototype O2 If* star HD 93129A dominates the compact cluster Trumpler 14, one of the ionizing clusters of the Carina Nebula. It has been an anchor point for analyses of the most massive stars. Unexpectedly, it has been resolved as a 55 mas binary by FGS. The derived delta m of 0.9 implies that the companion may be similar to the O3 dwarfs HD 93128 and HD 93129B {3" from A} in Tr 14. Recent radio and X-ray data suggest that the HD 93129A system is a colliding-wind binary. We propose to resolve the system spectroscopically with STIS in both the optical and FUV. Also, we plan an orbit of very short ACS exposures on this key cluster to obtain resolved multicolor photometry of its crowded inner members for the first time. {2} The recent discovery of a CNO dichotomy among five O2 giants in the Magellanic Clouds provides a new evolutionary diagnostic for the most massive stars, which is related to their initial rotational velocities. The abundance anomalies are seen in the UV wind spectra as well as optical lines. We propose to observe the FUV spectrum of the LMC ON2 star LH10-3061 with STIS to support further analysis, since it is the only one of these stars lacking UV data.

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