The LkH-alpha 101 infrared cluster

Details The LkH-alpha 101 infrared cluster The LkH-alpha 101 infrared cluster

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..221b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 221-231.

Astronomy and Astrophysics

Astronomy

45

B Stars, Brown Dwarf Stars, Infrared Sources (Astronomy), Open Clusters, Pre-Main Sequence Stars, Star Formation, Color-Magnitude Diagram, Deep Space, Near Infrared Radiation, Protostars, Sky Surveys (Astronomy), Spatial Distribution, Star Distribution

Scientific paper

IRIM on the KPNO 1.3-m telescope is used to map an 8-ft x 12-ft area, corresponding to a 1.9- x 2.8-pc field centered on the Herbig Ae/Be star, LkH-alpha 101, in the near-infrared J and K bandpasses. The discovery of an embedded cluster of more than 100 young stellar objects within this area is reported. The present completeness limits are estimated at 16.5 mag at J and 14.5 mag at K. Four types of cluster members, defined by their location in the K versus J-K color magnitude diagram, are identified. The embedded cluster population of the LkH-alpha 101 cloud core is found to consist of 16 Class I sources, 39 probable Class I sources, 40 young embedded low-mass PMS stars, and 46 young, embedded brown dwarf candidates. From the relative numbers of sources of each type, an upper limit for the accreting protostar phase of 400,000 yr is estimated. The spatial distribution of the sources in the cloud core is highly nonuniform, such that the youngest sources are the most centrally concentrated.

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