Masses and luminosities for the giant spectroscopic/speckle interferometric binaries gamma Persei and phi Cygni

Details Masses and luminosities for the giant spectroscopic/speckle interferometric binaries gamma Persei and phi Cygni Masses and luminosities for the giant spectroscopic/speckle interferometric binaries gamma Persei and phi Cygni

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87..563m&link_type=abstract

Astronomical Journal, vol. 87, Mar. 1982, p. 563-569. USAF-supported research

Astronomy and Astrophysics

Astronomy

25

Astrometry, Binary Stars, Red Giant Stars, Stellar Luminosity, Stellar Mass, Anomalies, Interferometry, Orbital Elements, Stellar Motions

Scientific paper

Speckle interferometric measurements of the spectroscopic binaries γ Per and φ Cyg are combined with the spectroscopic orbits to determine the elements of the apparent orbits and the masses, distances, and luminosities of the four components. These two systems are of considerable interest because they contain highly evolved stars, and φ Cyg is a rare example of a binary star whose components are similarly evolved off the main sequence. The newly determine masses of (2.50 ± 0.09)Msun and (2.39 ± 0.08)Msun and distance of 71.9 ± 5.5 pc place the G8III-IV components of φ Cyg at the point of beginning the ascent of the red giant branch. The orbit of γ Per is confirmed to be highly inclined, and the masses of 4.7Msun and 2.8Msun an distance of 73.8 pc suggest that a classification of G8II-III + B9V is more appropriate than the existing classification of G8III + A3V. Atmospheric eclipses may be exhibited by γ Per a periastron passages.

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