Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408l..33s&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 408, no. 1, p. L33-L36.
Astronomy and Astrophysics
Astrophysics
45
Binary Stars, Pre-Main Sequence Stars, Star Distribution, Star Formation, Stellar Spectra, T Tauri Stars, Emission Spectra, Stellar Luminosity
Scientific paper
Ages for the pre-main-sequence stars in the Taurus star-forming region now known to be multiples are systematically younger than the ages of the singles. This seems to be an artifact. Overestimating the stellar luminosity in an unresolved multiple whose components are on Hayashi tracks produces an underestimate of the system's age. Until the astrophysical parameters of the components in the multiples become better known, the published age estimates for the single stars should be more accurate. Their average age is 2-3 times that of the multiples regarded as unresolved objects. Since most of the stars in the Taurus star-forming region are in multiples, the average age of the entire group of stars is 2-3 times older than previously thought. This result applies to both the strong and weak emission-line pre-main-sequence stars. The implications of a longer phase of pre-main-sequence activity are discussed.
Ghez Andrea M.
Leinert Ch.
Simon Manfred
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