Reddening estimation for halo red giants using UVBY photometry

Details Reddening estimation for halo red giants using UVBY photometry Reddening estimation for halo red giants using UVBY photometry

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.1577a&link_type=abstract

The Astronomical Journal, vol. 107, no. 4, p. 1577-1590

Astronomy and Astrophysics

Astronomy

82

Galactic Evolution, Globular Clusters, Halos, Interstellar Extinction, Photometry, Red Giant Stars, Spectroscopy, Stellar Magnitude, Astronomical Catalogs, Geomagnetic Latitude, Luminosity, Metallicity, Northern Sky

Scientific paper

Updated uvby observations for a larger sample of metal-deficient red giants are presented and combined with a select sample of data from the literature transformed to a common system. Using the reddening maps of Burstein & Heiles (1982), new absolute magnitudes, distances, metallicities, and reddenings are derived for each star. The metallicities are determined with a revised calibration of the m1, (b-y) diagram based upon comparison to a complilation of recent spectrsoscopic abundances transformed to a common system. The photometric abundances agree very well with the spectroscopic; the dispersion among the residuals for 58 giants is +/- 0.16 dex. The dereddened indices are used to show that for red giants with (Fe/H) less than -1.5, there is a well-defined relation in the c0, (b-y)0 diagram which exhibits only a weak dependence upon metallicity. Use of the standard relations allows one to obtain reddening estimates for normal halo field giants and globular clusters in the appropriate metallicity range.

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