Calibrating The Cosmic Distance Scale: An Accurate Distance to the LMC Using Eclipsing Binaries

Details Calibrating The Cosmic Distance Scale: An Accurate Distance to the LMC Using Eclipsing Binaries Calibrating The Cosmic Distance Scale: An Accurate Distance to the LMC Using Eclipsing Binaries

Aug 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop..244g&link_type=abstract

NOAO Proposal ID #2000B-0244

Computer Science

Scientific paper

The distance to the LMC is crucial to calibrating the cosmic distance scale but remains controversial and uncertain despite the efforts of many investigators ((V-M_v)_circ=18.2-18.7 mag). Recently we have shown that the analysis of eclipsing binary (EB) systems has the potential to resolve this controversy. Guinan et al. (1998, ApJ, 509, L21) analyzed ground- and space-based observations of LMC-HV2274 and determined a distance modulus of (V-M_v)_circ=18.30+/-0.07 mag. A preliminary analysis of LMC-HV982, from observations secured at CTIO in January 2000, yields (V-M_v)_circ=18.34+/-0.10 mag. Such an excellent agreement demonstrates the power of this method. While it has long been recognized that EBs provide fundamental determinations of the fundamental stellar properties, such as mass and radius, the results for HV2274 and HV982 show that they also serve as accurate standard candles. We request additional Blanco 4-m echelle observations to complete the radial velocity curves of 6 eclipsing binaries in the LMC. When combined with existing light curves and existing HST low-dispersion spectroscopy (1150- 4800 Å), the analysis of these data should reduce the uncertainty of the LMC distance to better than 2-3%.

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