A photometric study of the close binary Delta Orionis A

Details A photometric study of the close binary Delta Orionis A A photometric study of the close binary Delta Orionis A

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...248..249k&link_type=abstract

Astrophysical Journal, Part 1, vol. 248, Aug. 15, 1981, p. 249-255.

Astronomy and Astrophysics

Astrophysics

21

Eccentric Orbits, Eclipsing Binary Stars, Light Curve, Stellar Luminosity, Stellar Spectrophotometry, Variable Stars, Ephemeris Time, O Stars, Stellar Evolution, Stellar Structure, Stellar Winds, Tables (Data)

Scientific paper

Green and blue photoelectric light curves show the historical intrinsic variability of the Delta Ori A close binary superposed on the interaction and eclipse effects. There is a considerable measure of agreement between spectrographic and photometric determinations of the rate of apsidal advance. The determinacy of orbital eccentricity, however, is confused because few minima of indifferent precision exist to check the spectrographic value. No physical mechanism can be found to account for a possible diminution of orbital eccentricity, and this is probably best attributed to unrecognized complications of at least one of the existing light curves. After numerous trials, a less-than-perfect theoretical representation of the light curve was achieved and shows the system to be detached. The absolute stellar parameters make clear that both components have evolved substantially. A mean stellar structure constant k2 is derived but cannot be compared usefully to existing theoretical values. The importance of the recently discovered visual companion, hz 42, is emphasized.

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