==========================================================================
II/233 Tycho variables stars (Piquard 2001)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
tablet.dat tableb-v.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=II/233
==========================================================================
drwxr-xr-x 351 cats archive 8192 Mar 25 10:13 [Up]
drwxr-xr-x 2 cats archive 290 Jan 12 2023 [TAR file]
-rw-r--r-- 1 cats archive 463 Dec 19 2022 .message
-r--r--r-- 1 cats archive 11066 Dec 10 2001 ReadMe
-rw-r--r-- 1 cats archive 864 Sep 19 2007 +footg5.gif
-rw-r--r-- 1 cats archive 6110 Mar 5 2008 +footg8.gif
-r--r--r-- 1 cats archive 6271 Dec 6 2001 tableb-v.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 55985 Dec 6 2001 tablet.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
-r--r--r-- 1 cats archive 3849256 Nov 9 2001 thesis.ps.gz [Uncompressed]
Beginning of ReadMe :II/233 Tycho variables stars (Piquard 2001)
================================================================================
Detection and classification of Tycho variables stars
Piquard S.
<PhD Dissertation, Strasbourg, (2001)>
================================================================================
ADC_Keywords: Stars, variable ; Magnitudes
Description:
We present the results of the classification procedure described in
Piquard's PhD thesis applied to the 1091 stars presented in Piquard et
al. (2001. Cat. J/A+A/373/576). In those six tables we give
indication of variability type for all the stars detected as variables
in Piquard et al. (2001, Cat. J/A+A/373/576). First of all, we
looked for periodic signals in the light curves using adapted Renson's
(Renson, 1978A&A....63..125R) and Stellingwerf's (Stellingwerf,
1978ApJ...224..953S) methods applied to the tree different photometric
bands from Tycho (Cat. I/239): T, B_T_, V_T_ (the T band is defined
from the added count-rates in the B_T_ and V_T_ channels, Grossmann et
al.. 1995A&A...304..110G). Then we developed a semi-automatic method
using 5 parameters (Period, color index, reduced proper motion from
Tycho-2 catalogue (Cat. I/259), 2 indicators of the shape of the
light curve) and a maximum likelihood method, combined with a careful
look on the light curves. Finaly, the identification of the
variability type is kept only if the resulting light curve is
convincing (periodic the star has the P status, if not periodic the
star has the U status); else we need more information about the star
and is has the A status. All this identifications are indications
since the quality of the light curves are often poor, particularly
when the star is fainter than T=10.