Statistics – Computation
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..700p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 94, Sept. 1987, p. 700-711. NSF-USAF-supported research.
Statistics
Computation
18
Cool Stars, K Lines, Line Spectra, Radial Velocity, Stellar Mass, A Stars, Computational Astrophysics, G Stars, Luminous Intensity, Wavelengths
Scientific paper
Measurement and analysis of the set of Michigan spectrograms of the 14y.6 binary γ Per shows that the masses of the A3 and G8 III stars are 2.0 M_sun; and 3.0 M_sun; rather than the abnormally large values for the types found by McLaughlin (1948), 2.8 and 4.9. The decreases are primarily due to an upward revision of the large orbital eccentricity. Speckle interferometric observations of high quality covering nine years with the components resolved are analyzed. The well-determined parallax, 0arcsec.014, along with Bahng's (1958) evaluation of the magnitude difference between the components, leads to absolute magnitudes MV of +0.3 and -1.1 for the A star and G giant, respectively, values more than a magnitude more luminous than "standard" values for the spectral types. Thus, each star appears to be in a state of rapid evolution, a situation not permitted by evolutionary theory for stars of such different mass if they have a common origin.
McAlister Harold A.
Popper Daniel M.
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