UBVR light curves of weak-line T Tauri stars Virtual Observatory Resource

Authors
  1. Grankin K.N.
  2. Bouvier J.
  3. Herbst W.
  4. Melnikov S.Yu.
  5. Published by
    CDS
Abstract

T Tauri stars exhibit variability on all timescales, whose origin is still debated. On WTTS the variability is fairly simple and attributed to long-lived, ubiquitous cool spots. We investigate the long term variability of WTTS, extending up to 20 years in some cases, characterize it statistically and discuss its implications for our understanding of these stars. We have obtained a unique, homogeneous database of photometric measurements for WTTS extending up to 20-years. It contains more than 9000 UBVR observations of 48 WTTS. All the data were collected at Mount Maidanak Observatory (Uzbekistan) and they constitute the longest homogeneous record of accurate WTTS photometry ever assembled. Definitive rotation periods for 35 of the 48 stars are obtained. Phased light curves over 5 to 20 seasons are now available for analysis. Light curve shapes, amplitudes and colour variations are obtained for this sample and various behaviors exhibited, discussed and interpreted. Our main conclusion is that most WTTS have very stable long term variability with relatively small changes of amplitude or mean light level. The long term variability seen reflects modulation in the cold spot distributions. Photometric periods are stable over many years, and the phase of minimum light can be stable as well for several years. On the long term, spot properties do change in subtle ways, leading to secular variations in the shape and amplitudes of the light curves.

Keywords
  1. pre-main-sequence-stars
  2. infrared-photometry
  3. visible-astronomy
  4. Wide-band photometry
Bibliographic source Bibcode
2008A&A...479..827G
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/479/827
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/479/827
Document Object Identifer DOI
doi:10.26093/cds/vizier.34790827

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/479/827
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/479/827
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/479/827
IVOA Table Access TAP
http://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).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/479/827/stars?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/479/827/stars?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/479/827/stars?

History

2008-04-13T15:47:08Z
Resource record created
2008-04-13T15:47:08Z
Created
2017-10-12T13:00:41Z
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