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, cilt.131, ss.345-354, 1998 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 131 Konu: 2
  • Basım Tarihi: 1998
  • Doi Numarası: 10.1051/aas:1998429
  • Dergi Adı: ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES
  • Sayfa Sayısı: ss.345-354

Özet

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.