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

Warrick A. Lawson; Lisa A. Crause; Eric E. Mamajek; Eric D. Feigelson

doi:10.1046/j.1365-8711.2001.03967.x

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

Warrick A. Lawson, Lisa A. Crause, Eric E. Mamajek, Eric D. Feigelson

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Abstract

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(L_X/L_bol) ≈ -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 4-9 Myr for M-type RECX primaries using the tracks of D'Antona & Mazzitelli.

Original language	English (US)
Pages (from-to)	57-66
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	321
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.2001.03967.x
State	Published - Feb 11 2001

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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10.1046/j.1365-8711.2001.03967.x

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title = "The η Chamaeleontis cluster: Photometric study of the ROSAT-detected weak-lined T Tauri stars",

abstract = "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(LX/Lbol) ≈ -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 4-9 Myr for M-type RECX primaries using the tracks of D'Antona & Mazzitelli.",

author = "Lawson, {Warrick A.} and Crause, {Lisa A.} and Mamajek, {Eric E.} and Feigelson, {Eric D.}",

year = "2001",

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doi = "10.1046/j.1365-8711.2001.03967.x",

language = "English (US)",

volume = "321",

pages = "57--66",

journal = "Monthly Notices of the Royal Astronomical Society",

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TY - JOUR

T1 - The η Chamaeleontis cluster

T2 - Photometric study of the ROSAT-detected weak-lined T Tauri stars

AU - Lawson, Warrick A.

AU - Crause, Lisa A.

AU - Mamajek, Eric E.

AU - Feigelson, Eric D.

PY - 2001/2/11

Y1 - 2001/2/11

N2 - 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(LX/Lbol) ≈ -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 4-9 Myr for M-type RECX primaries using the tracks of D'Antona & Mazzitelli.

AB - 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(LX/Lbol) ≈ -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 4-9 Myr for M-type RECX primaries using the tracks of D'Antona & Mazzitelli.

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JO - Monthly Notices of the Royal Astronomical Society

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IS - 1

ER -

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

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