Proper Motions in the Galactic Bulge: Plaut's Window

Details Proper Motions in the Galactic Bulge: Plaut's Window Proper Motions in the Galactic Bulge: Plaut's Window

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35..123v&link_type=abstract

XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (

Astronomy and Astrophysics

Astronomy

Astrometry, Catalogs, Galaxy: Bulge, Galaxy: Disk, Stars: Kinematics

Scientific paper

A proper motion study of a field of 20'×20' inside Plaut's low extinction window (l,b)=(0°,-8°), has been completed. Relative proper motions and photographic BV photometry have been derived for ˜ 21, 000 stars reaching to V ˜ 20.5 mag, based on the astrometric reduction of 43 photographic plates, spanning over 21 years of epoch difference. Proper motion errors are typically 1 mas yr^{-1}. Cross-referencing with the 2MASS catalog yielded a sample of ˜ 8700 stars, from which predominantly disk and bulge subsamples were selected photometrically from the JH color-magnitude diagram. The two samples exhibited different proper-motion distributions, with the disk displaying the expected reflex solar motion. Galactic rotation was also detected for stars between ˜ 2 and ˜ 3 kpc from us. The bulge sample, represented by red giants, has an intrinsic proper motion dispersion of (σ_{l}, σ_{b})=(3.39,2.91)+/-(0.11, 0.09) mas yr^{-1}, which is in good agreement with previous results. A mean distance of 6.37^{+0.87}_{-0.77} kpc has been estimated for the bulge sample, based on the observed K magnitude of the horizontal branch red clump. The metallicity [M/H] distribution was also obtained for a subsample of 60 bulge giants stars, based on calibrated photometric indices. The observed [M/H] shows a peak value at [M/H] ˜ -0.1 with an extended metal poor tail and around 30% of the stars with supersolar metallicity. No change in proper motion dispersion was observed as a function of [M/H]. We are currently in the process of obtaining CCD UBVRI photometry for the entire proper-motion sample of ˜ 21, 000 stars.

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