An attempt to understand RT SCULPTORIS

Details An attempt to understand RT SCULPTORIS An attempt to understand RT SCULPTORIS

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.100..117r&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 100, no. 1-2, March 1984, p. 117-127.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Photometry, Binary Stars, Mass Transfer, Stellar Evolution, Companion Stars, Light Curve, Metallicity, Secular Variations, Stellar Mass Ejection, Subdwarf Stars

Scientific paper

The metal-deficient star RT Sculptoris is a rare binary showing a secularly decreasing period, probably due to mass transfer from the more to the less massive component. The somewhat difficult photometric solution indicates a semidetached configuration with one star only very slightly smaller than its limiting lobe. Probably it is the more massive and lower temperature star which fills its lobe. The photometric solution for the mass ratio (q) is especially troublesome, as there are at least two (nearly equally deep) minima in parameter space; one at q = 1.10, and another at q = 1.67. The few existing radial velocity observations are inadequate for a determination of the mass ratio, yet point to absolute masses which are about half of those expected. Attention is given to whether this result can be understood in terms of low metallicity, and it is concluded that a significant part of the discrepancy can be so explained. The remainder could be due to accretion luminosity and to evolution. Some comments are made in regard to whether RT Sculptoris is likely to evolve into a contact system.

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