Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...678..200c&link_type=abstract
The Astrophysical Journal, Volume 678, Issue 1, pp. 200-218.
Astronomy and Astrophysics
Astronomy
9
Ism: H Ii Regions, Galaxies: Magellanic Clouds, Stars: Formation
Scientific paper
We used Spitzer infrared observations to find the young stars of two H II regions in the Large Magellanic Cloud, N63 and N180. The young stellar object (YSO) candidates were identified in each nebula by means of color-color, color-magnitude diagrams, and the shapes of their spectral energy distributions (SEDs). The most luminous YSOs are found near the ionization fronts within strong 8 μm emission clumps. Most YSOs, less luminous, are seen in projection inside the H II regions. HST images show several Class I stars that have emerged along the borders of the H II regions; other YSOs are embedded in cometary clouds. The most luminous YSO of N63 is connected to a string of pointlike sources. Its SED can be modeled by a central source of stellar mass M* between 7 and 11 Msolar, with a circumstellar disk of outer radius Rd of ~55 AU, and an envelope of moderate accretion rate, Ṁenv of ~2×10-5 Msolar yr-1. N180 is experiencing a phase of star formation more intense than N63, attested by the properties of its most luminous YSO: M* of 25 Msolar, Rd of ~200 AU, and Ṁenv of ~1.5×10-3 Msolar yr-1. The modes of triggered star formation in N63 and N180 appear similar to those seen in Galactic H II regions.
Caulet Adeline
Chu Y.-H. Y.-H.
Gruendl Robert A.
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