Evidence for a Population of Numerous Binaries with Comparably Bright Components among HIPPARCOS ``Single'' F Stars

Details Evidence for a Population of Numerous Binaries with Comparably Bright Components among HIPPARCOS ``Single'' F Stars Evidence for a Population of Numerous Binaries with Comparably Bright Components among HIPPARCOS ``Single'' F Stars

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...524l..99s&link_type=abstract

The Astrophysical Journal, Volume 524, Issue 2, pp. L99-L102.

Astronomy and Astrophysics

Astronomy

9

Stars: Binaries: General, Galaxy: Kinematics And Dynamics, Galaxy: Stellar Content, Galaxy: Solar Neighborhood, Stars: Kinematics

Scientific paper

We find evidence for the presence of a population of numerous binaries with comparably bright components (C binaries) among Hipparcos F stars that are flagged in the Hipparcos catalog as single. We propose a criterion that identifies such binaries. The criterion is based on comparison of absolute magnitude M_V obtained from the Hipparcos parallax and Johnson V magnitude with absolute magnitude derived from the dereddened uvby luminosity index c_0, Mc_0. For photometrically unresolved binaries, M_V must be brighter because it represents the integrated flux of a binary system, while Mc_0 is determined by the integrated spectrum and is thus close to the absolute magnitude of the primary. We have conducted a series of tests that have revealed the presence of C binaries among Hipparcos ``single'' F stars and confirmed that the proposed criterion is quite effective at identifying these stars. The C binary candidates have been found to be, on average, older than the candidates comprising single stars and binaries with disparate components (D binaries).

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