Astron. J., 129, 776-789 (2005/February-0)
Near-infrared imaging observations of the N159/N160 complex in the Large Magellanic Cloud: large clusters of Herbig Ae/Be stars and sequential cluster formation.
NAKAJIMA Y., KATO D., NAGATA T., TAMURA M., SATO S., SUGITANI K., NAGASHIMA C., NAGAYAMA T., IWATA I., ITA Y., TANABE T., KURITA M., NAKAYA H. and BABA D.
Abstract (from CDS):
We have carried out deep near-infrared imaging observations of the N159/N160 star-forming region in the Large Magellanic Cloud. We observed an area of ∼380 arcmin2 (∼80,000 pc2 at the distance of the LMC) in the J, H, and Ksbands. The observations are deep enough to detect Herbig Ae/Be stars down to ∼3 M☉in the LMC. We discovered a total of 338 and 464 candidate Herbig Ae/Be and OB stars, respectively, based on the near-infrared colors and magnitudes. The Herbig Ae/Be candidates comprise 10 clusters, the OB star candidates 13. We discovered an embedded Herbig Ae/Be cluster in the N159 East giant molecular cloud (GMC) and a Herbig Ae/Be cluster at the northeast tip of the N159 South GMC. Together with two neighboring H II regions, the Herbig Ae/Be cluster at the tip of the N159S GMC provides a hint of the beginning of sequential cluster formation in N159S. The spatial distributions of the Herbig Ae/Be and OB clusters, in conjunction with previously known optical clusters and embedded massive stars, indicate (1) sequential cluster formation within each of the N159 and N160 star-forming regions and (2) large-scale sequential cluster formation over the entire observed region from N160 to N159S. Possible triggers for the large-scale cluster formation are the supergiant shell SGS 19 and an expanding superbubble. Some of the Herbig Ae/Be clusters in the N159/N160 complex are significantly larger in spatial extent than pre-main-sequence clusters of similar age in the Milky Way. Highly turbulent gas motion in the LMC is probably responsible for forming the large young clusters.
Galaxies: Star Clusters - Infrared: Stars - Galaxies: Magellanic Clouds - Stars: Formation - Stars: Pre-Main-Sequence
Fig.1, Table 3: [NKN2005] N158-AN (Nos Y1, O1), [NKN2005] N159-AN (Nos Y1 to Y4, O1 to O3), [NKN2005] N159S-AN (No. Y1), [NKN2005] N160-ANN (Nos Y1 to Y5, O1 to O10). Fig.6, Table 5: [NKN2005] N159S Star N (Nos 1-6).
Par. 2, red stars cskd = [JHR80] D-, T = TVLM, BRI 0021 = BRI 0021-02
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