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J/AJ/134/1432 Proper motions in Plaut's window (Vieira+, 2007)
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Beginning of ReadMe :J/AJ/134/1432 Proper motions in Plaut's window (Vieira+, 2007)
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Proper motions in the Galactic Bulge: Plaut's window.
Vieira K., Casetti-dinescu D.I., Mendez R.A., Rich R.M., Girard T.M.,
Korchagin V.I., Van Altena W., Majewski S.R., Van Den Bergh S.
<Astron. J., 134, 1432-1446 (2007)>
=2007AJ....134.1432V
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ADC_Keywords: Stars, nearby ; Proper motions ; Photometry, infrared
Keywords: astrometry - catalogs - Galaxy: bulge - Galaxy: disk -
stars: kinematics
Abstract:
A proper-motion study of a field of 20'x20' inside Plaut's
low-extinction window (l,b) = (0deg, -8deg) has been completed.
Relative proper motions and photographic BV photometry have been
derived for 21000 stars reaching to V 20.5mag, based on the
astrometric reduction of 43 photographic plates, spanning over 21yr of
epoch difference. Proper-motion errors are typically 1mas/yr, and
field-dependent systematics are below 0.2mas/yr. 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 as a function of magnitude.
Description:
This investigation is based on 43 photographic plates, taken with five
different telescopes: the 51cm Double Astrograph at the Yale Southern
Observatory (YSO) in El Leoncito, Argentina; the 2.1m at KPNO; the du
Pont 2.5m at Las Campanas; the Blanco 4m at CTIO; and the Hale 5m
at Palomar Observatory.