Observation and analysis of RW Doradus


Marino B. F. , Walker W. S. G. , Bembrick C., Budding E.

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, vol.24, no.4, pp.199-207, 2007 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 24 Issue: 4
  • Publication Date: 2007
  • Doi Number: 10.1071/as07009
  • Title of Journal : PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
  • Page Numbers: pp.199-207

Abstract

Photometry of the short-period (P similar to 0.285 d) low-mass (M-1 similar to 0.67, M-2 similar to 0.48 M-circle dot) W UMa-type eclipsing binary RW Dor, mainly involving a good series of observations in 1987-88, using standard B and V filters at the Auckland Observatory, is examined. Analysis via light curve fittings alone permits both transit (near main sequence) and occultation (W-type contact binary) solutions. Consideration of proximity or other effects on the relatively small number of measured radial velocities gives rise to a more detailed review of the alternatives, though the (W-type) configuration determined by Hilditch, Hill & Bell (1992) is still confirmed. Further implications of this configuration are examined, given an apparent general trend to period decrease (Delta P/P similar to 6 x 10(-11)), and some light curve asymmetry. This is consistent with the initially low-mass companion, Case-B scenario of Budding (1984). The evidence does suggest irregularity of the period variation however, and further detailed surveillance, including more spectroscopy, is desirable.