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Title:
Spitzer View of Young Massive Stars in the Large Magellanic Cloud H II Complex N 44
Authors:
Chen, C.-H. Rosie; Chu, You-Hua; Gruendl, Robert A.; Gordon, Karl D.; Heitsch, Fabian
Affiliation:
AA(Department of Astronomy, University of Illinois, Urbana, IL 61801, USA ; Present address: Department of Astronomy, University of Virginia, Charlottesville, VA 22904, USA; . ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under contract to the National Science Foundation.; ), AB(Department of Astronomy, University of Illinois, Urbana, IL 61801, USA ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under contract to the National Science Foundation.; ), AC(Department of Astronomy, University of Illinois, Urbana, IL 61801, USA ; Visiting Astronomer, Cerro Tololo Inter-American Observatory. CTIO is operated by AURA, Inc. under contract to the National Science Foundation.; ), AD(Space Telescope Science Institute, Baltimore, MD 21218, USA ), AE(Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA )
Publication:
The Astrophysical Journal, Volume 695, Issue 1, pp. 511-541 (2009). (ApJ Homepage)
Publication Date:
04/2009
Origin:
IOP
ApJ Keywords:
H II regions, infrared: stars, ISM: individual: N44, Magellanic Clouds, stars: formation, stars: pre-main sequence
DOI:
10.1088/0004-637X/695/1/511
Bibliographic Code:
2009ApJ...695..511C

Abstract

The H II complex N 44 in the Large Magellanic Cloud (LMC) provides an excellent site to perform a detailed study of star formation in a mild starburst, as it hosts three regions of star formation at different evolutionary stages, and it is not as complicated and confusing as the 30 Doradus giant H II region. We have obtained Spitzer Space Telescope observations and complementary ground-based 4 m uBVIJK observations of N 44 to identify candidate massive young stellar objects (YSOs). We further classify the YSOs into Types I, II, and III, according to their spectral energy distributions (SEDs). In our sample of 60 YSO candidates, ~65% of them are resolved into multiple components or extended sources in high-resolution ground-based images. We have modeled the SEDs of 36 YSOs that appear single or dominant within a group. We find good fits for Types I and I/II YSOs, but Types II and II/III YSOs show deviations between their observed SEDs and models that do not include PAH emission. We have also found that some Type III YSOs have central holes in their disk components. YSO counterparts are found in four ultracompact H II regions and their stellar masses determined from SED model fits agree well with those estimated from the ionization requirements of the H II regions. The distribution of YSOs is compared with those of the underlying stellar population and interstellar gas conditions to illustrate a correlation between the current formation of O-type stars and previous formation of massive stars. Evidence of triggered star formation is also presented.
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