Young stellar objects in the large magellanic cloud: N63 and N180 H II regions

Adeline Caulet, R. A. Gruendl, Y. H. Chu

Research output: Contribution to journalArticlepeer-review


We used Spitzer infrared observations to find the young stars of two H n 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 M, with a circumstellar disk of outer radius Rd of ∼55 AU, and an envelope of moderate accretion rate, Ṁenv of ∼2 × 10-5 M 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 M, Rd of ∼200 AU, and Menv of ∼1.5 × 10-3 Ṁ yr-1. The modes of triggered star formation in N63 and N180 appear similar to those seen in Galactic H II regions.

Original languageEnglish (US)
Pages (from-to)200-218
Number of pages19
JournalAstrophysical Journal
Issue number1
StatePublished - May 1 2008


  • H II regions
  • Magellanic clouds
  • Stars: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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