
%0 Journal Article
%A Mamajek, Eric E 
%A Feigelson, Eric D 
%A Lawson, Warrick A 
%T A Radio Survey of Older T Tauri Stars in the eta Chamaeleontis Cluster
%J Publications of the Astronomical Society of Australia
%D 1999/11/01
%V 16
%N 3
%P 257-261
%K 
%R https://doi.org/10.1071/AS99257
%U https://www.publish.csiro.au/paper/AS99257 
%X A radio continuum survey of X-ray-identified weak-lined T Tauri stars (WTTs) in the newly-discovered ´ Chamaeleontis cluster has been completed using the Australia Telescope Compact Array (ATCA). The 10 known WTTs in the cluster form a unique sample of codistant late-type pre-main-sequence stars with ages of ~8 Myr and masses ranging from 0.1 - 1.0 M_sun. Our survey detected none of the 10 X-ray-emitting WTTs with 3¾ sensitivity limits at 4.8 and 8.6 GHz (6.2 and 3.5 cm) of typically 0.4 mJy, corresponding to a radio luminosity of 4.5 x 10^15 erg Hz^-1 s^-1. Rotation periods for these stars indicate that they are not, as a group, fast-rotating stars. The non-detection in the radio bands supports the findings of other radio surveys of inhomogeneous samples of young stars, where radio emission is fairly common (10{30%) among very young T Tauri stars across all late spectral types, but confined to rapidly-rotating F-G-K stars amongst older zero-age main sequence stars. Rotation, more than youth, appears to be the key to radio emission in young stars. 
