Radio emission from ROSAT-discovered young stars in and around taurus-auriga

Lee Carkner, Eric Mamajek, Eric Feigelson, Ralph Neuhäuser, Rainer Wichmann, Joachim Krautter

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19 Scopus citations


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° 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 × 1028 ergs s-1 have radio luminosity densities in excess of 3.5 × 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 × 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.

Original languageEnglish (US)
Pages (from-to)735-743
Number of pages9
JournalAstrophysical Journal
Issue number2 PART I
StatePublished - 1997

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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