Radial velocities of 2 VY Sculptoris-type CV stars Virtual Observatory Resource

Authors
  1. Weil K.E.
  2. Thorstensen J.R.
  3. Haberl F.
  4. Published by
    CDS
Abstract

We report observations of the known cataclysmic variable star (CV) V704 And, and also confirm that the optical counterpart of the ROSAT Galactic Plane Survey source RX J2338+431 is a heretofore-neglected CV. Photometric and spectroscopic observations from MDM Observatory show both systems to be nova-like variables that exhibit dips of 4-5 mag from their mean brightnesses, establishing them as members of the VY Scl subclass. From high-state emission-line radial velocities, we determine orbital periods of 0.151424(3) days (3.63 hr) for V704 And and 0.130400(1) days (3.13 hr) for RX J2338+431. In V704 And, we find that the H{alpha} emission-line measures cluster into distinct regions on a plot of equivalent width versus full width at half-maximum, which evidently correspond to high, intermediate, and low photometric states. This allows us to assign spectra to photometric states when contemporaneous photometry is not available, an apparently novel method that may be useful in studies of other novalikes. Our low-state spectra of RX J2338+431 show features of an M-type secondary star, from which we estimate a distance of 890+/-200 pc, in good agreement with the Gaia DR2 (Cat. I/345) parallax.

Keywords
  1. cataclysmic-variable-stars
  2. variable-stars
  3. radial-velocity
  4. infrared-photometry
  5. visible-astronomy
  6. sloan-photometry
Bibliographic source Bibcode
2018AJ....156..231W
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/156/231
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/156/231
Document Object Identifer DOI
doi:10.26093/cds/vizier.51560231

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http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/156/231/table1?

History

2019-04-25T14:44:14Z
Resource record created
2019-04-25T14:44:14Z
Created
2019-05-07T07:23:31Z
Updated

Contact

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