Empirical Calibration of Isochrones and the Local Distance Scale

Details Empirical Calibration of Isochrones and the Local Distance Scale Empirical Calibration of Isochrones and the Local Distance Scale

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112702a&link_type=abstract

American Astronomical Society, AAS Meeting #211, #127.02; Bulletin of the American Astronomical Society, Vol. 39, p.957

Astronomy and Astrophysics

Astronomy

Scientific paper

I present a method for empirically calibrating color-temperature relations of theoretical stellar isochrones to improve the local distance scale from main-sequence fitting. In the first application of the method, I demonstrate that the Cepheid period-luminosity (P-L) relation as derived from Milky Way open clusters yields a distance to NGC 4258 that is consistent with a geometric distance derived from water maser sources. After correcting for a metallicity difference, I derive a distance to the LMC of 18.34 ± 0.06 (unique to the LMC) ± 0.16 (systematic error in P-L relations). The accuracy of the distances could be improved with better photometry of calibrating clusters. Finally, I estimate the precision of distances and photometric metallicities for halo main-sequence stars from SDSS to characterize stellar substructures in the Galactic halo.

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