A search for previously unrecognised metal-poor subdwarfs in the Hipparcos astrometric catalogue

Details A search for previously unrecognised metal-poor subdwarfs in the Hipparcos astrometric catalogue A search for previously unrecognised metal-poor subdwarfs in the Hipparcos astrometric catalogue

2000-12-12

arxiv.org/abs/astro-ph/0012277v1

Mon.Not.Roy.Astron.Soc. 325 (2001) 931

Astronomy and Astrophysics

Astrophysics

to appear in Monthly Notices of the Royal Astronomical Society (some tables appear out of order in the text)

Scientific paper

10.1046/j.1365-8711.2001.04350.x

We have identified 317 stars included in the Hipparcos astrometric catalogue which have parallaxes measured to a precision of better than 15%, and whose location in the (M_V, (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 Stromgren, Johnson/Cousins and Walraven photometry for over 120 stars. In addition, we present new UBVRI photometry of 201 of these candidate halo stars, together with similar data for a further 14 known metal-poor subdwarfs. Those observations provide the first extensive dataset of RI photometry of metal-poor, main-sequence stars with well-determined trigonometric parallaxes. Finally, we have obtained intermediate-resolution optical spectroscopy of 175 stars. We are able to estimate abundances for 270 stars. 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.

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