Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic RR Lyrae Stars

Details Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic RR Lyrae Stars Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic RR Lyrae Stars

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011dda....42.0306b&link_type=abstract

American Astronomical Society, DDA meeting #42, #3.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new absolute trigonometric parallaxes and proper motions for seven Pop II variable stars: the five RR Lyr stars; RZ Cep, XZ Cyg, SU Dra, RR Lyr, UV Oct; and two W Vir Pop II Cepheids; VY Pyx and kappa Pav. We obtain these results with astrometric data from Fine Guidance Sensor 1r, a white-light interferometer on Hubble Space Telescope. We measure absolute parallaxes with an average precision, 6.6%. Using these parallaxes we compute absolute magnitudes in V and K bandpasses corrected for interstellar extinction and Lutz-Kelker-Hanson bias. Considering only the RR Lyr stars, we use these absolute magnitudes to construct a K-band Leavitt Law (Period-Luminosity relation) and a Galactic Mv-[Fe/H] relation. We employ these relations to determine independent distances to the LMC and several globular clusters. For the LMC our K-band distance modulus from RR Lyr stars agrees within the errors with a previous value derived by us from Galactic Cepheids, uncorrected for metallicity.
These results are based on observations made through grants GO-11211 and GO-11789 administered through the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555.

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