2011MNRAS.411L..51M

Query : 2011MNRAS.411L..51M

2011MNRAS.411L..51M - Mon. Not. R. Astron. Soc., 411, L51-L55 (2011/February-2)

Episodic disc accretion in the halo of the `old' pre-main-sequence cluster η Chamaeleontis.

MURPHY S.J., LAWSON W.A., BESSELL M.S. and BAYLISS D.D.R.

Abstract (from CDS):

We present multi-epoch medium-resolution observations of two M4.5 candidate members in the halo of the ∼ 8 Myr η Chamaeleontis open cluster. During six months of observations, both stars exhibited variations in their Hα line profiles on time-scales of days to months, with at least one episode of substantial activity attributable to accretion from a circumstellar disc. We derive an accretion rate of ∼ 10–8.7 M☉/yr for this event, with a rate of ∼ 10–10.6 M☉/yr in quiescence. Episodic accretion like that observed here suggests existing surveys of accreting weak-lined T Tauri stars in young clusters are likely incomplete and that gas dissipation time-scales calculated from the fraction of accreting objects are underestimates.

This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.


Abstract Copyright: 2010 The Authors Monthly Notices of the Royal Astronomical Society2010 RAS

Journal keyword(s): accretion, accretion discs - techniques: spectroscopic - stars: low-mass - stars: pre-main-sequence - open clusters and associations: individual: η Chamaeleontis

Simbad objects: 13

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Number of rows : 13
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 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 308 0
2 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
3 2MASS J08014860-8058052 Y*? 08 01 48.6226444584 -80 58 05.399660676           M4.4 11 0
4 2MASS J08202975-8003259 Y*? 08 20 29.7781345968 -80 03 26.041747716           m4.3 15 0
5 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 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* EM Cha Or* 08 43 07.2443828304 -79 04 52.483961064     10.8     K6.0 64 0
9 V* ET Cha Or* 08 43 18.5853516024 -79 05 18.232481832     13.97     M4.0 99 0
10 V* EN Cha Or* 08 44 16.421808 -78 59 08.06316   16.425 14.967 14.688   M4.5 70 0
11 V* EP Cha Or* 08 47 01.6439909496 -78 59 34.380161016     11.1     K5IVe 109 0
12 LP 666-9 BD* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 274 1
13 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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