Metal-poor turnoff and subgiant field stars in the Galaxy - I. RGU photometry in a high-latitude field near M101

Ak S. , Karaali S. , Buser R.

ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, vol.131, no.2, pp.345-354, 1998 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 131 Issue: 2
  • Publication Date: 1998
  • Doi Number: 10.1051/aas:1998429
  • Title of Journal : ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
  • Page Numbers: pp.345-354

Abstract

Photographic RGU photometry for about 1800 stars down to a limiting G-magnitude of 19.5 in a high-latitude field ((l, b) = (101 degrees, +60 degrees)) near the galaxy M101 is investigated. We use an improved variant of the classical three-color method which is based on recent UBV-RGU-photometric transforms and calibrations (Buser 1988; Buser & Fenkart 1990) and on models of the stellar density distributions of the Galactic population components.