Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-09-10
Astronomy and Astrophysics
Astrophysics
6 pages, including 2 pages of figures. Newly available optical (B and V) photometry has revealed -- and allowed the eliminatio
Scientific paper
10.1086/311760
The distance to the Large Magellanic Cloud (LMC) is crucial for the calibration of the Cosmic Distance Scale. We derive a distance to the LMC based on an analysis of ground-based photometry and HST-based spectroscopy and spectrophotometry of the LMC eclipsing binary system HV2274. Analysis of the optical light curve and HST/GHRS radial velocity curve provides the masses and radii of the binary components. Analysis of the HST/FOS UV/optical spectrophotometry provides the temperatures of the component stars and the interstellar extinction of the system. When combined, these data yield a distance to the binary system. After correcting for the location of HV2274 with respect to the center of the LMC, we find d(LMC) = 45.7 +/- 1.6 kpc or DM(LMC) = 18.30 +/- 0.07 mag. This result, which is immune to the metallicity-induced zero point uncertainties that have plagued other techniques, lends strong support to the ``short'' LMC distance scale as derived from a number of independent methods.
Bradstreet David H.
DeWarf Laurence E.
Fitzpatrick Edward L.
Gimenez Alvaro
Guinan Edward F.
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