Open AccessECHA J0843.3–7905: Discovery of an ‘old’ classical T Tauri star in the
η Chamaeleontis cluster
Author(s) -
Lawson Warrick A.,
Crause Lisa A.,
Mamajek Eric E.,
Feigelson Eric D.
Publication year - 2002
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2002.05093.x
Subject(s) - physics , t tauri star , astrophysics , balmer series , star cluster , star (game theory) , cluster (spacecraft) , astronomy , open cluster , star formation , stars , emission spectrum , spectral line , computer science , programming language
A limited‐area survey of the η Chamaeleontis cluster has identified two new late‐type members. The more significant of these is ECHA (=IRAS , a slowly rotating M2 classical T Tauri (CTT) star with a spectrum dominated by Balmer emission. At a distance of 97 pc and cluster age of ≈9 Myr, 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 , which is the lowest mass primary known in the cluster.