Four-colour photometry of eclipsing binaries. XXIV - Apsidal motion of QX Carinae, ζ Phoenicis and NO Puppis

Details Four-colour photometry of eclipsing binaries. XXIV - Apsidal motion of QX Carinae, ζ Phoenicis and NO Puppis Four-colour photometry of eclipsing binaries. XXIV - Apsidal motion of QX Carinae, ζ Phoenicis and NO Puppis

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...159..157g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 159, no. 1-2, April 1986, p. 157-165. Research supported by the Statens Naturv

Astronomy and Astrophysics

Astrophysics

21

Apsides, Eclipsing Binary Stars, Stellar Color, Stellar Motions, Stellar Spectrophotometry, Angular Velocity, Chemical Composition, Orbital Mechanics, Southern Hemisphere, Stellar Interiors, Stellar Magnitude, Stellar Mass, Stellar Models, Tables (Data), Ubv Spectra

Scientific paper

New, accurate photoelectric times of minimum light have been obtained for the detached southern-hemisphere eclipsing binaries QX Car, ζ Phe and NO Pup, previously analyzed within this series. The apsidal motion rates have been derived and the corresponding internal structure constants are discussed in light of the available theoretical models for the stellar interior. The apsidal motion periods have been found to be 361, 42 and 37 years for QX Car, ζ Phe and NO Pup, respectively. The corresponding internal structure constants, log k(2), are -2.08, -2.21 and -2.32 if homogeneous rotational velocity of the component stars is assumed. For ζ Phe and NO Pup, these values are found to be in reasonably good agreement with theoretical models by Hejlesen (1982) and Jeffery (1984). For the more massive system, QX Car, the models by Jeffery yield good agreement, whereas the observed log k(2) value is slightly lower than the theoretical value for the models by Hejlesen.

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