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J/ApJ/678/200 YSOs in N63 and N180 (Caulet+, 2008)
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Beginning of ReadMe :J/ApJ/678/200 YSOs in N63 and N180 (Caulet+, 2008)
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Young stellar objects in the Large Magellanic Cloud: N63 and N180 HII regions.
Caulet A., Gruendl R.A., Chu Y.-H.
<Astrophys. J., 678, 200-218 (2008)>
=2008ApJ...678..200C
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ADC_Keywords: YSOs ; Photometry, infrared ; Magellanic Clouds ; H II regions
Mission_Name: Spitzer
Keywords: H II regions - Magellanic Clouds - stars: formation
Abstract:
We used Spitzer infrared observations to find the young stars of two
HII 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 8um emission clumps.
Most YSOs, less luminous, are seen in projection inside the HII
regions. HST images show several Class I stars that have emerged along
the borders of the HII 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 11M_sun_, with a circumstellar disk
of outer radius R_d_ of 55AU, and an envelope of moderate accretion
rate, M_env_ of 2x10^-5^M_sun_/yr. N180 is experiencing a phase of
star formation more intense than N63, attested by the properties of
its most luminous YSO: M_*_ of 25M_sun_, R_d_ of 200AU, and M_env_
of 1.5x10^-3^M_sun_/yr. The modes of triggered star formation in
N63 and N180 appear similar to those seen in Galactic HII regions.
Description:
The deep Spitzer observations of N63 and N180 are part of program
ID 3565 "Massive Star Forming Regions in the LMC". They were obtained
on 2004 December 16 with the Infrared Array Camera (IRAC) and on 2005
March 7 with the Multiband Imaging Photometer (MIPS).