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A Radio Survey of Older T Tauri Stars in the η Chamaeleontis Cluster

Published online by Cambridge University Press:  05 March 2013

Eric E. Mamajek ,
Warrick A. Lawson  and
Eric D. Feigelson
Eric E. Mamajek
Affiliation:
School of Physics, University College UNSW, Australian Defence Force Academy, Canberra, ACT 2600, Australia; eem@ph.adfa.edu.au
Warrick A. Lawson
Affiliation:
School of Physics, University College UNSW, Australian Defence Force Academy, Canberra, ACT 2600, Australia; wal@ph.adfa.edu.au
Eric D. Feigelson
Affiliation:
Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA; edf@astro.psu.edu
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Abstract

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A radio continuum survey of X-ray-identified weak-lined T Tauri stars (WTTs) in the newly-discovered η 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⊙. Our survey detected none of the 10 X-ray-emitting WTTs with 3σ 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 ×1015 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.

Keywords

open clusters and associations: η Chamaeleontisstars: pre-main-sequenceradio continuum: stars
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 3 , 1999 , pp. 257 - 261
Copyright
Copyright © Astronomical Society of Australia 1999

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