Physics
Scientific paper
Feb 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..129c&link_type=abstract
NOAO Proposal ID #1999A-0129
Physics
Scientific paper
One among the most important unsolved problems in the study of globular cluster (GC) stellar evolution concerns the presence of a number of GCs with ``bimodal" distributions of horizontal-branch (HB) stars. It has been extensively argued that an understanding of the physical origin of HB bimodality would prove invaluable for deciphering the ``second-parameter problem" of HB morphology, with important implications for our understanding of the Galaxy's formation history and age. One route towards understanding the HB bimodality problem is provided by the RR Lyrae variables present in such systems. Well-known bimodal-HB GCs include NGC 1851, NGC 2808 and NGC 6229. However, it has recently been established that M75 too has a bimodal (NGC 1851-like) HB. We propose to obtain high-precision CCD light curves for the RR Lyrae variables in M75 - a cluster which has thus far only been studied using photographic plates. Our much more precise and extensive dataset will establish whether the M75 RR Lyraes show the period shift expected if they are overluminous, and thus help pin down the physical origin for M75's HB bimodality.
Catelan Márcio
Corwin Michael T.
Smith Horace
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