The Longevity of Circumstellar Disks: The η Chamaeleontis Cluster

Details The Longevity of Circumstellar Disks: The η Chamaeleontis Cluster The Longevity of Circumstellar Disks: The η Chamaeleontis Cluster

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jkas...38..241l&link_type=abstract

Journal of the Korean Astronomical Society, vol. 38, no. 2, pp. 241-244

Astronomy and Astrophysics

Astronomy

2

Accretion: Accretion Disks, Circumstellar Matter, Open Clusters And Associations: Individual: &Eta, Chamaeleontis

Scientific paper

We have analysed near-infrared JHKL observations of the members of the ≈9 Myr-old η Chamaeleontis cluster. Using (J-H)/(K-L) and (H-K)/(K-L) IR colour-colour diagrams for the brightest 15 members of the cluster, we find the fraction of stellar systems with near-IR excess emission was 0.60 ± 0.13 (2σ). For the CTT and WTT star population, we also find a strong correlation between the IR excess and Hα emission which is also known as an accretion indicator. The (K-L) excess of these stars appears to indicate a wide range of star-disk activity; from a CTT star with high levels of accretion, to CTT,WTT transitional objects with evidence for some on-going accretion, and WTT stars with weak or absent IR excesses. Among the brightest 15 members, four stars (RECX 5, 9, 11 and ECHA J0843.3-7905) with IR excesses Δ(K-L) > 0.4 mag and strong or variable optical emission were identified as likely experiencing on-going mass accretion from their circumstellar disks which we confirmed their accretion disks from the optical high-resolution echelle spectroscopic study. The resulting accretion fraction of 0.27 ± 0.13 (2σ) suggests that the accretion phase, in addition to the disks themselves, can endure for at least ˜ 10 Myr.

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