The η Chamaeleontis cluster: photometric study of the ROSAT-detected weak-lined T Tauri stars

Details The η Chamaeleontis cluster: photometric study of the ROSAT-detected weak-lined T Tauri stars The η Chamaeleontis cluster: photometric study of the ROSAT-detected weak-lined T Tauri stars

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.321...57l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 321, Issue 1, pp. 57-66.

Astronomy and Astrophysics

Astronomy

49

Stars: Activity, Stars: Pre-Main-Sequence, Stars: Rotation, Open Clusters And Associations: Individual: &Eta, Chamaeleontis, X-Rays: Stars, Stars: Activity, Stars: Pre-Main-Sequence, Stars: Rotation, Open Clusters And Associations: Individual: Η Chamaeleontis, X-Rays: Stars

Scientific paper

We present the results of a photometric study of X-ray-active weak-lined T Tauri (WTT) stars in the η Chamaeleontis star cluster. Multi-epoch V-band photometric monitoring during 1999 and 2000 of the 10 X-ray-active WTT stars found that all were variable in one or both years, with periods ascribed to rotational modulation of starspots. Comparison between the rotational and X-ray properties of these objects indicates the saturation level, log(LXLbol)~-3, observed in other studies of X-ray-active pre-main-sequence stars, persists in the η Cha stars from the slow- to the fast-rotator regimes. Cousins VRI photometry of the WTT stars has enabled us to investigate further the photometric properties of these stars. The stars appear sufficiently coeval to distinguish near-equal-mass binaries within the sample. A new Hertzsprung-Russell diagram for these objects suggests ages of 4-9Myr for M-type RECX primaries using the tracks of D'Antona & Mazzitelli.

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