Diverse protostellar evolutionary states in the young cluster AFGL961

Details Diverse protostellar evolutionary states in the young cluster AFGL961 Diverse protostellar evolutionary states in the young cluster AFGL961

2009-05-11

arxiv.org/abs/0905.1693v1

Astrophys.J.699:1300-1306,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

22 pages, 7 figures, accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/699/2/1300

We present arcsecond resolution mid-infrared and millimeter observations of the center of the young stellar cluster AFGL961 in the Rosette molecular cloud. Within 0.2 pc of each other, we find an early B star embedded in a dense core, a neighboring star of similar luminosity with no millimeter counterpart, a protostar that has cleared out a cavity in the circumcluster envelope, and two massive, dense cores with no infrared counterparts. An outflow emanates from one of these cores, indicating a deeply embedded protostar, but the other is starless, bound, and appears to be collapsing. The diversity of states implies either that protostellar evolution is faster in clusters than in isolation or that clusters form via quasi-static rather than dynamic collapse. The existence of a pre-stellar core at the cluster center shows that that some star formation continues after and in close proximity to massive, ionizing stars.

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