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

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

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..131..345a&link_type=abstract

Astronomy and Astrophysics Supplement, v.131, p.345-354

Astronomy and Astrophysics

Astrophysics

9

Galaxy: Structure Of, Galaxy: Stellar Content Of, Galaxy: Solar Neighborhood, Stars: Population Ii

Scientific paper

Photographic RGU photometry for about 1800 stars down to a limiting G-magnitude of 19.5 in a high-latitude field (({l,b}) = ({101(deg) , +60}(deg) )) 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 \cite[(Buser 1988; Buser & Fenkart 1990)]{B90} and on models of the stellar density distributions of the Galactic population components. In particular, predictions from the Galactic models of \cite[Gilmore & Wyse (1985)]{G85} are employed as guides in determining the density functions from the present data, which are then used in turn to derive consistent local luminosity functions. We find that a significant fraction of the intermediate and extreme Population II stars must be (mildly) evolved (rather than main-sequence) stars whose higher-luminosity nature cannot be inferred from their two-color positions only. This conclusion is also consistent with results obtained from combined RGU-photometric and proper motion data in two other Basel fields by \cite[Buser & Chiu (1981a,b),]{B81a} as well as from detailed model-calculations for the larger survey of RGU-data in seven high-latitude fields by \cite[Buser & Rong (1995)]{B95} and \cite[Buser et al. (1998a).]{B97a}

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