Tycho variables stars Virtual Observatory Resource

Authors
  1. Piquard S.
  2. Published by
    CDS
Abstract

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.

Keywords
  1. variable-stars
  2. apparent-magnitude
Bibliographic source
PhD Dissertation, Strasbourg, (2001)
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/II/233
IVOA Identifier IVOID
ivo://CDS.VizieR/II/233

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=II/233
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=II/233
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=II/233
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/II/233/tablet?
https://vizier.iucaa.in/viz-bin/conesearch/II/233/tablet?
http://vizieridia.saao.ac.za/viz-bin/conesearch/II/233/tablet?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/II/233/tableb-v?
https://vizier.iucaa.in/viz-bin/conesearch/II/233/tableb-v?
http://vizieridia.saao.ac.za/viz-bin/conesearch/II/233/tableb-v?

History

2003-07-22T08:29:39Z
Resource record created
2003-07-22T08:29:39Z
Created
2017-12-06T07:38:02Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr