Issue |
A&A
Volume 445, Number 3, January III 2006
|
|
---|---|---|
Page(s) | 971 - 978 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20053251 | |
Published online | 03 January 2006 |
Mid-infrared images of the massive star forming region W75 N
1
Istituto Astrofisica Spaziale e Fisica Cosmica, INAF, via fosso del cavaliere 100, 00133 Roma, Italy e-mail: persi@rm.iasf.cnr.it
2
Instituto de Astronomía, UNAM, Apartado Postal 877, 22830 Ensenada, BC Mexico
3
Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Received:
15
April
2005
Accepted:
22
August
2005
An infrared study that includes ground-based
mid-infrared images between 8.7 and 18.7 μm and IRAC images at
3.6, 4.5, 5.8 and 8.0 μm of the W75 N massive star forming
region is presented. The 12.5 μm image shows the presence of
four mid-infrared sources in the region W75 N(B), three of which
have bright near-infrared counterparts, IRS 1, IRS 2 and IRS 3,
all with significant excess emission at m.
IRS 2 has a steep energy distribution and the computed infrared
luminosity is consistent with the presence of a young B3 star. The
observed IRAC colors of IRS 3 indicate that this source is a Class
II intermediate mass young star, consistent with its infrared
energy distribution and luminosity. The fourth, newly discovered,
mid-infrared source appears coincident with the ultracompact HII
region VLA 3, and is located within the millimeter core MM 1. We
derived a luminosity of ∼
and a visual extinction
for this source. From the IRAC images, we detected
75 sources in an area of
centered in W75 N.
At least 25 of these sources are associated with the molecular
cloud and form a young stellar cluster as shown in the IRAC
two-color and the
versus
diagrams.
Key words: stars: formation / infrared: stars / ISM: clouds / ISM: HII regions
© ESO, 2006
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