Early-type stars in the Galactic halo from the Palomar-Green Survey II: A sample of distant, apparently young Population I stars

Details Early-type stars in the Galactic halo from the Palomar-Green Survey II: A sample of distant, apparently young Population I stars Early-type stars in the Galactic halo from the Palomar-Green Survey II: A sample of distant, apparently young Population I stars

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347...69r&link_type=abstract

Astronomy and Astrophysics, v.347, p.69-76 (1999)

Astronomy and Astrophysics

Astrophysics

28

Stars: Abundances, Stars: Atmospheres, Stars: Early-Type, Stars: Kinematics

Scientific paper

We present échelle (R ~ 40 000) spectroscopic observations for a sample of apparently normal, high Galactic latitude, early-type stars drawn from the Palomar-Green Survey. The metal-line spectra show evidence for rotational velocity broadening with values of vsin i<=300 km s(-1) . In conjunction with Kurucz model atmospheres, we derive stellar photospheric abundances that are consistent with a Population i chemical composition; differential abundances with respect to Galactic disk Population i stars indicate no abundance differences outside the estimated errors. From a comparison of the derived atmospheric parameters with recent theoretical evolutionary models, we derive distance and age estimates for individual stars. Using kinematical considerations, we conclude that all these objects are `runaway' stars, formed in the Galactic disk and subsequently ejected, possibly by supernovae explosions or dynamical interactions. Tables 4 and 5 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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