Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.5008p&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #50.08; Bulletin of the American Astronomical Society, Vol. 34, p.1188
Astronomy and Astrophysics
Astronomy
Scientific paper
We present both a star count and kinematic analysis of halo, thick disk, and disk stars on either side of the Sun-Center line from l = +/- 20 deg to \pm 75 deg and b = +/- 20 deg to \pm 50°. Star counts using data from the Automated Plate Scanner for 80 POSS I fields yields a 30-40% excess in the number of thick disk stars both above and below the galactic plane in quadrant I when compared to quadrant IV. We produce a map of the asymmetry's morphology and extent. Possible explanations include a bar-induced ``wake" or a triaxial thick disk. Optical spectra for a sub-sample of 7 matching POSS I plate pairs was taken at the CTIO 4m and the KPNO / WIYN 3.5m. Over 1000 ( \sigma \pm10 km/s) were obtained using the multi-object spectrometer HYDRA. Radial velocity measurements confirm 85% of the stars sampled are consistent with thick disk velocities (vr$ = 40-60 km/s), and initial spectral classifications show F-G dwarfs dominate; however, there is a significant contribution of A dwarfs.
Humphreys Roberta M.
Larsen Jeffrey A.
Parker Jeniffer E.
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