2002MNRAS.329L..29L

Query : 2002MNRAS.329L..29L

2002MNRAS.329L..29L - Mon. Not. R. Astron. Soc., 329, L29-L33 (2002/January-2)

ECHA J0843.3-7905: Discovery of an `old' classical T Tauri star in the η Chamaeleontis cluster.

LAWSON W.A., CRAUSE L.A., MAMAJEK E.E. and FEIGELSON E.D.

Abstract (from CDS):

A limited-area survey of the η Chamaeleontis cluster has identified two new late-type members. The more significant of these is ECHA J0843.3-7905 (=IRAS F08450-7854), a slowly rotating (P=12 d) M2 classical T Tauri (CTT) star with a spectrum dominated by Balmer emission. At a distance of 97pc and cluster age of ~9Myr, the star is a nearby rare example of an `old' CTT star and promises to be a rewarding laboratory for the study of disc structure and evolution in pre-main sequence (PMS) stars. The other new member is the M4 weak-lined T Tauri (WTT) star ECHA J0841.5-7853, which is the lowest mass (M~0.2 M_☉) primary known in the cluster.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): stars: activity - circumstellar matter - stars: pre-main-sequence - stars: rotation - open clusters and associations: individual: η Chamaeleontis

Nomenclature: Table 1: ECHA JHHMM.m+DDMM N=2.

CDS comments: Table 1: Anonymous star = EQ J084834.9-785352.

Simbad objects: 19

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Number of rows : 19
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 GSC 09402-01003 LP? 08 36 40.7271524832 -78 54 58.303115388   14.18 12.48 12.08   M2III 3 0
2 V* EG Cha Or* 08 36 56.2143359952 -78 56 45.633633000   11.82 10.457   9.010 K4Ve 110 0
3 TYC 9398-99-1 * 08 37 51.4403459808 -78 44 37.063474836   13.06 11.27     K5III 7 0
4 * eta Cha Pu* 08 41 19.5125857944 -78 57 48.105898056 5.02 5.351 5.453     B8V 246 0
5 V* ES Cha Or* 08 41 30.3105474648 -78 53 06.477949932     17.07     M5.0 49 0
6 V* EH Cha Or* 08 41 37.0144539384 -79 03 30.535583220     14.4 14.011   M3.5 62 0
7 HD 75505 * 08 41 44.7049093968 -79 02 53.258689068   7.55 7.38     A1V 57 0
8 V* EI Cha Or* 08 42 23.7595500240 -79 04 02.976309552     12.7     M1.5 71 0
9 V* EK Cha Or* 08 42 27.0967343784 -78 57 47.910415932   16.659 15.153 14.893   M4.5 84 0
10 Cl Mamajek 1 OpC 08 42 32.9 -78 57 47           ~ 392 0
11 V* EL Cha TT* 08 42 38.7832034688 -78 54 42.736732812   15.540 14.081 13.778   M3.0 69 0
12 V* EM Cha Or* 08 43 07.2443828304 -79 04 52.483961064     10.8     K6.0 64 0
13 * 9 Cha SB* 08 43 12.1984130688 -79 04 12.368512452   6.28 6.07     A7V 242 0
14 V* ET Cha Or* 08 43 18.5853516024 -79 05 18.232481832     13.97     M4.0 99 0
15 V* EN Cha Or* 08 44 16.421808 -78 59 08.06316   16.425 14.967 14.688   M4.5 70 0
16 V* EQ Cha TT* 08 47 56.7585043512 -78 54 53.185560516   14.777 13.308 12.802 10.795 M3 88 0
17 DENIS J084834.9-785352 PM* 08 48 34.8706100901 -78 53 51.359088465   18.5 17.81 16.7 14.07 M5e 8 0
18 TYC 9403-831-1 * 08 51 23.2039382520 -79 05 23.237599488   12.47 11.19 10.92   K4III 3 0
19 V* TW Hya TT* 11 01 51.9053285064 -34 42 17.033218380   11.94 10.50 10.626 9.18 K6Ve 2144 1

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