Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10184z&link_type=abstract
HST Proposal ID #10184
Computer Science
Hst Proposal Id #10184 Hot Stars
Scientific paper
Our reductions of archival STIS/FUV-MAMA data {AR9225} have discovered 13 completely unexpected and unexplained Ultraviolet bright variables. Eleven of the variables have been identified with evolved stars {Horizontal Branch or Asymptotic Giant Branch}. The total number and nature of these systems is completely unknown. If these variables are binaries the implication is that the binary fraction {up to 25%} in NGC 1851 is the highest in all Galactic globular clusters. The radial distributions of the variables and the blue horizontal branch stars imply a common origin and perhaps an explanation of the bi-modal morphology of the horizontal branch in the color magnitude diagrams of globular clusters. These variables may be the tip of the iceberg and a critical clue concerning the infamous "second parameter". We propose to observe NGC 1851 on three occasions with the same setup as the archival data to determine the total number and periods of the ultraviolet variables.
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