/ftp/cats/aliases/P/./PTS2006



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J/A+A/445/971       Mid-infrared images of W75N              (Persi+, 2006)
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	table3.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A+A/445/971
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Beginning of ReadMe : J/A+A/445/971 Mid-infrared images of W75N (Persi+, 2006) ================================================================================ Mid-infrared images of the massive star forming region W75 N. Persi P., Tapia M., Smith H.A. <Astron. Astrophys., 445, 971-978 (2006)> =2006A&A...445..971P ================================================================================ ADC_Keywords: H II regions ; YSOs ; Infrared sources Keywords: stars: formation - infrared: stars - ISM: clouds - ISM: HII regions Abstract: An infrared study that includes ground-based mid-infrared images between 8.7 and 18.7um and IRAC images at 3.6, 4.5, 5.8 and 8.0um of the W75 N massive star forming region is presented. The 12.5um 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 lambda>2.0um. 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  750L_sun_ and a visual extinction A_V_ 90 for this source. From the IRAC images, we detected 75 sources in an area of 120"x120" 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 H-Ks versus Ks-[3.6] diagrams. Description: Mid-infrared images between 8.7 and 18.7um of W75N were taken during three observing runs on September 2000, November 2001 and September 2003 with the mid-infrared camera CID on the 2.1 m telescope of the Observatorio Astronomico Nacional at San Pedro Martir, Baja California, Mexico. The images at 3.6, 4.5, 5.8 and 8.0um of W75N presented here are sections of the original IRAC images of the star forming region DR21 observed during the science verification period of the Spitzer satellite.