Early-type stars in orthogonal halo fields. 2: Identification of metal-rich A stars in the halo

Details Early-type stars in orthogonal halo fields. 2: Identification of metal-rich A stars in the halo Early-type stars in orthogonal halo fields. 2: Identification of metal-rich A stars in the halo

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1839r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 1839-1852

Astronomy and Astrophysics

Astronomy

22

A Stars, Balmer Series, Calcium, Early Stars, Galactic Halos, Metallicity, Potassium, Radial Velocity, Abundance, Interstellar Extinction, Kinematics, Stellar Spectrophotometry, Telescopes

Scientific paper

The results of spectrophotometry of the Ca II K and Balmer lines and radial velocity measurements for stars earlier than type FO, with 10 less than V less than 15.5 in fields at (l;b) = 90 deg, 270 deg; -45 deg) are reported. Slit spectroscopy of 320 stars shows that in this magnitude range there are approximately 80 stars with (Fe/H) greater than -0.5. The metal-rich population has a vertical scale height of approximately 600 pc and a space density at the Sun equal to 1/225 of the young thin disk A star population. The metal-rich A stars have Vrot = 210 +/- 60 km/s with decreasing angular momentum as a function of distance from the Galactic plane. The line-of-sight velocity dispersion is 40 +/- 3 km/s indicating an anomalous relation between structure and kinematics. There is strong evidence that these stars are identical in properties to the metal-rich extended populations found by Perry (1969) at the NGP and Rodgers (1971) at the SGP.

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