Radio Observations of the TW Hya Association

Details Radio Observations of the TW Hya Association Radio Observations of the TW Hya Association

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.8902c&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #89.02; Bulletin of the American Astronomical Society, Vol. 33, p.1435

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We report on 1) a survey of the members of the TW Hya association for radio emission at 8.5 GHz, 2) a sensitive broad-band radio spectrum from 1.4 to 15.0 GHz of TW Hya itself, and 3) bi-monthly monitoring of the radio emission from TW Hya using the NRAO VLA. Five out of eleven targets of the association members were easily detected at flux densities similar to that of TW Hya itself. The radio spectral index of the emission from TW Hya between 8.5 and 15.0 GHz is 0.8+/-0.6, consistent with partially thick thermal free-free emission. We will discuss the nature of the cm-wave radio emission from members of the TW Hya association in terms of plausible physical mechanisms such as ionized winds and gyrosynchrotron activity. The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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