The HR Diagram of Metal-Deficient Stars

Details The HR Diagram of Metal-Deficient Stars The HR Diagram of Metal-Deficient Stars

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..343b&link_type=abstract

Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 343-346

Computer Science

2

Scientific paper

Observational HR diagrams in the M_V, B-V plane have been constructed for about 150 Hipparcos-parallax stars of field Population II having sigma_pi/pi values less than 0.20. The sample treated is representative of main sequence, turn-off, subgiant, giant and HB stars with metal deficiency varying from moderate to extremely low [Fe/H] values. As a result of the improvements in absolute magnitudes, we find that a considerable fraction (about 40 per cent) of F-G stars classified earlier as subdwarfs are subgiants. Based on comparison of our observational loci with globular cluster fiducials and theoretical isochrones, an age spread of 7 +/- 2 Gyr is found among halo stars, which is similar to that detected recently among halo globular clusters. Some results obtained from the Hipparcos-based kinematics of metal-deficient field stars are also presented.

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