RY Tau in 1996 Virtual Observatory Resource

Authors
  1. Petrov P.P.
  2. Zajtseva G.V.
  3. Efimov Yu.S.
  4. Duemmler R.
  5. Ilyin I.V.,Tuominen I.
  6. Shcherbakov V.A.
  7. Published by
    CDS
Abstract

The T Tauri star RY Tau has increased its brightness from V=10.6mag to V=9.6mag in October-November 1996. By February-March 1997, the star has faded again to V=10.8mag. High-resolution echelle spectra of RY Tau were obtained wit h the SOFIN spectrograph at the Nordic Optical Telescope (La Palma, Spain) at lo w and high brightness levels of the star. No significant changes in the photosph eric lines, which are sensitive to temperature and gravity, were noticed. The spectral type of RY Tau is defined as G1-2IV, which in combination with photomet ric data implies A_V_=1.0-1.3mag. Polarimetric patrol of RY Tau during the fadin g of the star showed an increase of its intrinsic polarization from 0.5-1.0% at high brightness to about 2% at low brightness in the V, R and I bands. The flux radiated in H{alpha} and the IR Ca II emission lines remained about the same, in spite of the one magnitude difference in the continuum flux. These results indicate that variable obscuration of the star by circumstellar dust clo uds was responsible for the brightness change of RY Tau, and that the emission l ine source is mostly outside of the obscured region.

Keywords
  1. pre-main-sequence-stars
  2. infrared-photometry
  3. visible-astronomy
  4. Wide-band photometry
  5. polarimetry
Bibliographic source Bibcode
1999A&A...341..553P
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/341/553
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/341/553
Document Object Identifer DOI
doi:10.26093/cds/vizier.33410553

Access

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http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/341/553
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History

1999-01-24T16:05:57Z
Resource record created
1999-01-24T15:06:03Z
Updated
1999-01-24T16:05:57Z
Created

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