SIMBAD references

2003ApJ...584..853P - Astrophys. J., 584, 853-874 (2003/February-3)

Astrophysics of young star binaries.


Abstract (from CDS):

This paper describes our study of the astrophysics of individual components in close pre-main-sequence binaries. We observed both stars in 17 systems, located in four nearby star-forming regions, using low-resolution (R=760) infrared spectroscopy and photometry. For 29 components we detected photospheric absorption lines and were able to determine spectral type, extinction, K-band excess, and luminosity. The other five objects displayed featureless or pure emission line spectra. In ∼50% of the systems, the extinction and K-band excess of the primary stars dominate those of the secondaries. Masses and ages were determined for these 29 objects by placing them on the H-R diagram, overlaid with theoretical pre-main-sequence tracks. Most of the binaries appear to be coeval. The ages span 5x105 to 1x107 yr. The derived masses range from the substellar, 0.06 M, to 2.5 M, and the mass ratios from M2/M1=0.04 to 1.0. Fourteen stars show evidence of circumstellar disks. The K-band excess is well correlated with the K-L color for stars with circumstellar material.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: General - Stars: Low-Mass, Brown Dwarfs - Stars: Pre-Main-Sequence

Simbad objects: 41

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