Radio Emission from ROSAT-discovered Young Stars in and around Taurus-Auriga

Details Radio Emission from ROSAT-discovered Young Stars in and around Taurus-Auriga Radio Emission from ROSAT-discovered Young Stars in and around Taurus-Auriga

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...490..735c&link_type=abstract

Astrophysical Journal v.490, p.735

Astronomy and Astrophysics

Astronomy

18

Radio Continuum: Stars, Stars: Pre-Main-Sequence, X-Rays: Stars, Galaxy: Open Clusters And Associations: Individual Name: Taurus-Auriga

Scientific paper

An 8.4 GHz VLA survey of 91 recently discovered lithium-rich late-type stars from the ROSAT All-Sky Survey and pointed observations is presented. These objects lie in the vicinity of the Taurus-Auriga star-forming region (d ~= 140 pc); however, some are dispersed nearly 30 deg from known active star-forming cloud cores. This sample represents a spatially complete, flux-limited population of X-ray-bright young stars both within and away from the primary Tau-Aur stellar nurseries. Of the 91 sources, 29 are detected in this radio survey with a sensitivity limit of ~0.15 mJy. If they are at the distance of the star-forming clouds, we find that 32% of widely distributed young stars with LX >= 5 x 1028 ergs s-1 have radio luminosity densities in excess of 3.5 x 1015 ergs s-1 Hz-1. This detection rate, the ranges of radio and X-ray luminosities, and the LR/LX ratios are consistent with known young weak-lined T Tauri stars (ages ~106 yr) that reside within the Taurus molecular clouds, but they are considerably higher than a zero-age main-sequence population such as the Pleiades (age ~=7 x 107 yr). The radio properties thus support the pre-main-sequence classification of the stars. They fitted well among other active young stars on the empirical LR versus LX diagram, implying that solar-type gyrosynchrotron activity is the radio emission mechanism.

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