Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pasa...16..257m&link_type=abstract
Publications Astronomical Society of Australia, vol. 16, no. 3, p. 257-61
Astronomy and Astrophysics
Astronomy
7
Open Clusters And Associations, Eta Chamaeleontis, Pre-Main-Sequence Stars
Scientific paper
A radio continuum survey of X-ray-identified weak-lined T Tauri stars (WTTs) in the newly-discovered eta 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 solar masses. Our survey detected none of the 10 X-ray-emitting WTTs with 3sigma 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 per Hz sec. Rotation periods for these stars indicate they are not, as a group, fast-rotating stars. The non-detection in radio 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.
Feigelson Eric D.
Lawson Warrick A.
Mamajek Eric E.
No associations
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