Protostars and stars in the Coronet cluster: Age, evolution, and cluster structure
Aurora Sicilia-Aguilar, Thomas Henning, Jouni Kainulainen, Veronica, Roccatagliata

TL;DR
This study combines optical, near-IR, and submillimeter observations to determine that the Coronet cluster is younger than 2 million years, revealing details about its structure, star formation activity, and disk evolution.
Contribution
It provides a revised, younger age estimate for the Coronet cluster based on new multi-wavelength data and analyzes its structure and star formation characteristics.
Findings
Cluster age estimated at ~0.5-1 Myr
Star formation occurs in two elongated structures
Low disk and accretion fraction observed
Abstract
We present new optical spectroscopy with FLAMES/VLT, near-IR imaging with HAWK-I/VLT, and 870 micron mapping with APEX/LABOCA of the Coronet cluster. The optical data allow to estimate spectral types, extinction and the presence of accretion in 6 more M-type members, in addition to the 12 that we had previously studied. The submillimeter maps and near-IR data reveal the presence of nebular structures and high extinction regions, which are in some cases associated to known IR, optical, and X-ray sources. Most star formation is associated to two elongated structures crossing in the central part of the cluster. Placing all the 18 objects with known spectral types and extinction in the HR diagram suggests that the cluster is younger than previously thought (<2 Myr, and probably ~0.5-1 Myr). The new age estimate is in agreement with the evolutionary status of the various protostars in the…
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