TY - JOUR
T1 - Radio emission from ROSAT-discovered young stars in and around taurus-auriga
AU - Carkner, Lee
AU - Mamajek, Eric
AU - Feigelson, Eric
AU - Neuhäuser, Ralph
AU - Wichmann, Rainer
AU - Krautter, Joachim
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
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U2 - 10.1086/304885
DO - 10.1086/304885
M3 - Article
AN - SCOPUS:21944452630
SN - 0004-637X
VL - 490
SP - 735
EP - 743
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2 PART I
ER -