Episodic disk accretion in the halo of the 'old' Pre-Main Sequence cluster Eta Chamaeleontis

Details Episodic disk accretion in the halo of the 'old' Pre-Main Sequence cluster Eta Chamaeleontis Episodic disk accretion in the halo of the 'old' Pre-Main Sequence cluster Eta Chamaeleontis

2010-11-16

arxiv.org/abs/1011.3816v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 5 figures, 1 table. Accepted for publication in MNRAS Letters

Scientific paper

We present multi-epoch medium-resolution observations of two M4.5 candidate members in the halo of the ~8 Myr Eta Chamaeleontis open cluster. Over six months of observations both stars exhibited variations in their H-alpha line profiles on timescales of days to months, with at least one episode of substantial activity attributable to accretion from a circumstellar disk. We derive an accretion rate ~10^-8.7 Msun/yr for this event, with a rate of ~10^-10.6 Msun/yr in quiescence. Episodic accretion like that observed here means existing surveys of accreting Weak-lined T-Tauri Stars in young clusters are likely incomplete and that gas dissipation timescales calculated from the fraction of accreting objects are underestimates.

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