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

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..245..351v&link_type=abstract

Formation and Evolution of Galaxy Bulges, Proceedings of the International Astronomical Union, IAU Symposium, Volume 245, p. 351

Astronomy and Astrophysics

Astronomy

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

Scientific paper

A proper motion study of a field of 20′ × 20′ inside Plaut's low extinction window (l,b)=(0o, -8o), 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 (σl, σb) = (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 UBV RI photometry for the entire proper-motion sample of ~ 21,000 stars.

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