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| Query : 2001MNRAS.321...57L |
2001MNRAS.321...57L - Mon. Not. R. Astron. Soc., 321, 57-66 (2001/February-2)
The η Chamaeleontis cluster: photometric study of the ROSAT-detected weak-lined T Tauri stars.
LAWSON W.A., CRAUSE L.A., MAMAJEK E.E. and FEIGELSON E.D.
Abstract (from CDS):
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, {formmu1} 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.
Abstract Copyright: 2001, Royal Astronomical Society
Journal keyword(s): stars: activity - stars: pre-main-sequence - stars: rotation - open clusters and associations: individual: η Chamaeleontis - X-rays: stars
Simbad objects: 14
| Number of rows : 14 |
| N | Identifier | Otype |
ICRS (J2000) RA |
ICRS (J2000) DEC |
Mag U | Mag B | Mag V | Mag R | Mag I | Sp type |
#ref
1850 - 2026 |
#notes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | V* EG Cha | Or* | 08 36 56.2143359952 | -78 56 45.633633000 | 11.82 | 10.457 | 9.010 | K4Ve | 110 | 0 | ||
| 2 | * eta Cha | Pu* | 08 41 19.5125857944 | -78 57 48.105898056 | 5.02 | 5.351 | 5.453 | B8V | 246 | 0 | ||
| 3 | V* EH Cha | Or* | 08 41 37.0144539384 | -79 03 30.535583220 | 14.4 | 14.011 | M3.5 | 62 | 0 | |||
| 4 | HD 75505 | * | 08 41 44.7049093968 | -79 02 53.258689068 | 7.55 | 7.38 | A1V | 57 | 0 | |||
| 5 | V* EI Cha | Or* | 08 42 23.7595500240 | -79 04 02.976309552 | 12.7 | M1.5 | 71 | 0 | ||||
| 6 | V* EK Cha | Or* | 08 42 27.0967343784 | -78 57 47.910415932 | 16.659 | 15.153 | 14.893 | M4.5 | 84 | 0 | ||
| 7 | Cl Mamajek 1 | OpC | 08 42 32.9 | -78 57 47 | ~ | 392 | 0 | |||||
| 8 | V* EL Cha | TT* | 08 42 38.7832034688 | -78 54 42.736732812 | 15.540 | 14.081 | 13.778 | M3.0 | 69 | 0 | ||
| 9 | V* EM Cha | Or* | 08 43 07.2443828304 | -79 04 52.483961064 | 10.8 | K6.0 | 64 | 0 | ||||
| 10 | * 9 Cha | SB* | 08 43 12.1984130688 | -79 04 12.368512452 | 6.28 | 6.07 | A7V | 242 | 0 | |||
| 11 | V* EN Cha | Or* | 08 44 16.421808 | -78 59 08.06316 | 16.425 | 14.967 | 14.688 | M4.5 | 70 | 0 | ||
| 12 | V* EO Cha | Or* | 08 44 31.8938144088 | -78 46 31.143275076 | 12.531 | 10.646 | M0e | 83 | 0 | |||
| 13 | V* EP Cha | Or* | 08 47 01.6439909496 | -78 59 34.380161016 | 11.1 | K5IVe | 109 | 0 | ||||
| 14 | V* EQ Cha | TT* | 08 47 56.7585043512 | -78 54 53.185560516 | 14.777 | 13.308 | 12.802 | 10.795 | M3 | 88 | 0 |
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