Reddening Estimation For Halo Red Giants Using UVBY Photometry (original) (raw)
ADS
;
Abstract
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.
Publication:
The Astronomical Journal
Pub Date:
April 1994
DOI:
Bibcode:
Keywords:
- Galactic Evolution;
- Globular Clusters;
- Halos;
- Interstellar Extinction;
- Photometry;
- Red Giant Stars;
- Spectroscopy;
- Stellar Magnitude;
- Astronomical Catalogs;
- Geomagnetic Latitude;
- Luminosity;
- Metallicity;
- Northern Sky;
- Astronomy;
- STARS: GIANT;
- GALAXY: HALO;
- STARS: ABUNDANCES