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Session 49 - Young Stellar Objects.
Display session, Tuesday, January 14
Metropolitan Ballroom,

[49.01] Radio Emission from ROSAT Discovered T Tauri Stars in and Around Taurus-Auriga

E. Mamajek, L. Carkner, E. Feigelson (Penn State U.), R. Neuhäuser (MPI für extraterrestrische Physik), R. Wichmann, J. Krautter (Landessternwarte Königstuhl)

An 8.4 GHz VLA survey of 91 recently discovered T Tauri 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 \simeq 140 pc), however some are dispersed nearly 30^\circ from known active star-forming cloud cores. This sample represents a spatially-complete, flux-limited population of X-ray bright T Tauri stars both within and away from the primary Tau-Aur stellar nurseries. Of the 91 sources, 17-29 are detected in this radio survey with a sensitivity limit of \sim0.15 mJy. Hence 19-32% of widely distributed T Tauri stars with L_X \ge 5\times10^28 ergs s^-1 have radio luminosity densities in excess of 3.5\times10^15 erg s^-1Hz^-1. This detection rate and range of radio and X-ray luminosities are consistent with known young weak-lined T Tauri stars (ages \sim 10^6) yr) which reside within the Taurus molecular clouds, but is considerably higher than a ZAMS population such as the Pleiades (age \simeq 7\times10^7 yr). These T Tauri stars fit well among other active young stars on the empirical L_R vs. L_X diagram, implying that solar type gyrosynchrotron activity is the radio emission mechanism.

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