Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..206m&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 206, 207. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
2
Eclipsing Binary Stars, Electrophotometry, Stellar Luminosity, Stellar Mass, Main Sequence Stars, Stellar Temperature, Subgiant Stars
Scientific paper
Using Wood's (1972) model, the photoelectric observations of de Santis and Tempesti (1977) - as yet only crudely studied - of the eclipsing binary RT UMi are reanalyzed. The photometric elements that are derived greatly differ from previous ones and permit a coherent (semi-detached) picture of this binary. The F 0 primary appears to be accompanied by a fainter and smaller (early K) cooler star, which fills its Roche lobe for the photometric mass ratio q = 0.3. The absolute elements of RT UMi, tentatively estimated by assuming for the primary a mass of 1.7 solar masses, reveal that the primary has probably slightly evolved from the main sequence, while the secondary (probably a subgiant) is clearly oversized and overluminous for its mass and temperature, as common post-mass-exchange subgiant secondaries of semi-detached systems.
Giuricin Giuliano
Mardirossian Fabio
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