A study of visual double stars with early type primaries. IV Astrophysical data

Details A study of visual double stars with early type primaries. IV Astrophysical data A study of visual double stars with early type primaries. IV Astrophysical data

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26as...60..183l&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 60, May 1985, p. 183-211.

Astronomy and Astrophysics

Astrophysics

64

B Stars, Double Stars, Early Stars, O Stars, Stellar Evolution, Stellar Spectrophotometry, Companion Stars, Stellar Color, Stellar Magnitude, Stellar Mass

Scientific paper

Astrophysical parameters (MK class, color excess, absolute magnitude, distance, effective temperature, mass, and age) are derived from calibrations of the uvby-beta indices for the members of 253 double stars with O or B type primaries and faint secondaries. The photometric spectral classification is compared to the MK classes, and the agreement is very good. The derived data together with spectroscopic and JHKL data are used for deciding which pairs are likely to be physical and which are optical, and it is shown that 98 (34 percent) of the secondaries are likely to be members of physical systems. For 90 percent of the physical pairs the projected separation between the components is less than 25,000 AU. A majority of the physical secondaries are late-type stars, and 50 percent of them are contracting towards the zero-age main-sequence. Also presented are new uvby-beta data for 43 secondaries and a computer program for determining astrophysical parameters from uvby-beta data.

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