Issue |
Astron. Astrophys. Suppl. Ser.
Volume 136, Number 2, April II 1999
|
|
---|---|---|
Page(s) | 261 - 267 | |
DOI | https://doi.org/10.1051/aas:1999212 | |
Published online | 15 April 1999 |
Extension of Tycho catalog for low-extinction windows in the galactic bulge*
Instituto Astronomico e Geofísico, Universidade de São Paulo, Av. Miguel Stéfano 4200, São Paulo, SP 04301-904, Brazil
Send offprint request to: T.P. Dominici
Received:
16
September
1998
Accepted:
7
January
1999
We present in this work secondary catalogs up to
based on the Tycho reference frame (ESA, 1997) for 12 selected
low-extinction fields towards the galactic bulge. The observations have
been performed with the Askania-Zeiss Meridian Circle equiped with a CCD
camera, located at the Abrahão de Moraes Observatory (Valinhos, Brazil)
and operated by the Institute of Astronomy and Geophysics, São Paulo
University. The presented catalog, though not complete, has been designed
to help in intensive search programmes (e.g. microlensing and variable
searches) and therefore the selected standards have a high astrometric and
photometric (V band, approximately) quality. The mean precisions obtained
were
in α,
in δ, 0.030 for the
standard deviation in magnitude and 0.0042 for the magnitude when weighted
with the error bars in each night (in the mean, 42 stars for the catalog
of each window).
Key words: catalogs / astrometry / Galaxy: center
© European Southern Observatory (ESO), 1999