Metal-poor subdwarfs in the Hipparcos catalog (Reid+, 2001)

Details Metal-poor subdwarfs in the Hipparcos catalog (Reid+, 2001) Metal-poor subdwarfs in the Hipparcos catalog (Reid+, 2001)

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ycat..73250931r&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/325/931. Originally published in: 2001MNRAS.325..931R

Astronomy and Astrophysics

Astronomy

Stars: Subdwarf, Stars: Metal-Deficient, Stars: Halo, Parallaxes: Trigonometric

Scientific paper

We have identified 317 stars included in the Hipparcos astrometric catalogue that have parallaxes measured to a precision of better than 15 per cent, and the location of which in the (MV, (B-V)T) diagram implies a metallicity comparable to or less than that of the intermediate-abundance globular cluster M5. We have undertaken an extensive literature search to locate Stroemgren, Johnson/Cousins and Walraven photometry for over 120 stars. In addition, we present new UBV(RI)C photometry of 201 of these candidate halo stars, together with similar data for a further 14 known metal-poor subdwarfs. These observations provide the first extensive data set of RCIC photometry of metal-poor, main-sequence stars with well-determined trigonometric parallaxes. Finally, we have obtained intermediate-resolution optical spectroscopy of 175 stars. 47 stars still lack sufficient supplementary observations for population classification; however, we are able to estimate abundances for 270 stars, or over 80 per cent of the sample. The overwhelming majority have near-solar abundance, with their inclusion in the present sample stemming from errors in the colours listed in the Hipparcos catalogue. Only 44 stars show consistent evidence of abundances below [Fe=H]=-1.0. Nine are additions to the small sample of metal-poor subdwarfs with accurate photometry. We consider briefly the implication of these results for cluster main-sequence fitting (1 data file).

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