Cosmological Calibrators in the Magellanic Clouds and Stars in the Solar Neighborhood; Revealing Binarity

Details Cosmological Calibrators in the Magellanic Clouds and Stars in the Solar Neighborhood; Revealing Binarity Cosmological Calibrators in the Magellanic Clouds and Stars in the Solar Neighborhood; Revealing Binarity

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8520n&link_type=abstract

HST Proposal ID #8520

Mathematics

Logic

Hst Proposal Id #8520

Scientific paper

We propose to use BEA time during SMOV3a to conduct a high angular resolution survey with FGS1r to detect binarity among luminous objects in the Magellanic Clouds and nearby M dwarfs and white dwarfs. By making use of a apability not available from any other observatory to address important and ongoing scientific investigations, theses observations will be a valuable service to the community and an important addition to the HST archives. An FGS survey of local dwarf stars will detect binaries with separations as small as 0.007" { 0.3 A.U. at 50 pc}. This will identify systems with periods as short as one year or less, ideal candidates for follow up studies to determine stellar masses. This is especially important for white dwarf stars, for which only three have dynamically determined masses. A survey of stars in the LMC and SMC at 0.007" resolution will detect binaries down to 400 AU, more than an order of magnitude improvement over WFPC2. Our targets have all been observed by HST's cameras and spectrograp hs {including HDE 269810, suspected to have a mass 200 solar masses} to calibrate the UV spectra of massive stars for cosmological investigations. Unrecognized binarity in these objects cause those observations to be misinterpreted, thereby contaminating the cosmological calibrations and our understanding of the high mass IMF and high mass cutoff in low metallicity star forming regions.

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