Imaging of UV Bright Stars in the Galactic Bulge

Details Imaging of UV Bright Stars in the Galactic Bulge Imaging of UV Bright Stars in the Galactic Bulge

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4546r&link_type=abstract

HST Proposal ID #4546

Computer Science

Hst Proposal Id #4546

Scientific paper

Recent HST UV images of the M31 bulge show that luminous post-AGB stars account for only 20% of its UV light. The stars mostly respnsible for flux in bulges and ellipticals have not yet been directly observed. We propose to image MW bulge field at 1500 A with FOC/96 + F140W, making survey of 6X10^4 Lsun. The stellar populations exceeds the Solar metal abundance, and the integrated spectra and stellar content are similar to distant galaxies. We plan to obtain 64 22"X22" FOC images through F140W in one bulge field, Baade's Window (500pc from the nucleus). If we can measure complete star counts and photometry to 0.2 mag accuracy, we can determine the evolutionary state of the stars responsible for the UV rising flux. We would expect to see 5 sources of 1 Myr lifetime, an 50 sources of the (most likely) 10 Myr lifetime associated with the metal rich core-He burning stars. Any stars discovered can be followed up with additional spectroscopy and high precision photometry, a level of detailed study not possible for the UV-Bright stars in distant galaxies.

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