Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasa...24..199m&link_type=abstract
Publications of the Astronomical Society of Australia, Volume 24, Issue 4, pp. 199-207.
Astronomy and Astrophysics
Astronomy
1
Stars: Close Binaries, Stars: Late-Type, Stars: Individual: Rw Dor, General: Contact Binaries Techniques: Photometric Light Curve Analysis
Scientific paper
Photometry of the short-period (P ~0.285 d) low-mass (M1 ~0.67, M2 ~0.48 Msolar) 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 (Δ P/P ~6 × 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.
Bembrick Colin
Budding Edwin
Marino Brian F.
Walker S. G. Stan W.
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