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J/ApJ/712/797    YSOs in Vul OB1 association                     (Billot+, 2010)

Young stellar objects and triggered star formation in the Vulpecula OB association. Billot N., Noriega-Crespo A., Carey S., Guieu S., Shenoy S., Paladini R., Latter W. <Astrophys. J., 712, 797-812 (2010)> =2010ApJ...712..797B
ADC_Keywords: Associations, stellar ; Photometry, infrared ; YSOs ; H II regions Keywords: H II regions - infrared: ISM - infrared: stars - stars: formation - stars: pre-main sequence Abstract: The Vulpecula OB association, Vul OB1, is a region of active star formation located in the Galactic plane at 2.3kpc from the Sun. Previous studies suggest that sequential star formation is propagating along this 100pc long molecular complex. In this paper, we use Spitzer MIPSGAL and GLIMPSE data to reconstruct the star formation history of Vul OB1, and search for signatures of past triggering events. We make a census of young stellar objects (YSOs) in Vul OB1 based on IR color and magnitude criteria, and we rely on the properties and nature of these YSOs to trace recent episodes of massive star formation. We find 856 YSO candidates, and show that the evolutionary stage of the YSO population in Vul OB1 is rather homogeneous -ruling out the scenario of propagating star formation. We estimate the current star formation efficiency to be ∼8%. We also report the discovery of a dozen pillar-like structures, which are confirmed to be sites of small scale triggered star formation. Description: The Spitzer Space Telescope observed over 270deg2 of the inner Galactic plane in six wavelength bands as part of two legacy programs: the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE; PI: E. Churchwell; Benjamin et al. 2003PASP..115..953B) and the MIPS GALactic plane survey (MIPSGAL; S. Carey PI; Carey et al. 2009PASP..121...76C). The Vulpecula region was covered by GLIMPSE I (PID 188) and MIPSGAL I (PID 20597). It was imaged with the Infrared Array Camera (IRAC) at 3.6, 4.5, 5.8, and 8.0um, and with the MIPS camera at 24 and 70um. The angular resolution of Spitzer is 2", 6", and 18" at 8, 24, and 70um, respectively. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 108 856 List of YSO candidates and their 2MASS, IRAC and MIPS photometry table3.dat 48 14 Pillars identification, coordinates, and approximate size table5.dat 108 14 List of point sources excluded from the YSO catalog and identified as probable contaminants based on their IRAC fluxes
See also: II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008) J/A+A/537/A1 : Infrared fluxes of HII regions and PNe (Anderson+, 2012) J/A+A/498/147 : High mass protostellar objects physical parameters (Grave+, 2009) J/ApJ/658/1264 : IR-excess sources in GLIMPSE and MSX (Uzpen+, 2007) Byte-by-byte Description of file: table[25].dat
Bytes Format Units Label Explanations
1- 7 A7 --- --- [SSTGLMC] 9- 25 A17 --- SSTGLMC GLIMPSE source name (GLLL.llll+BB.bbbb) 27- 33 F7.4 deg GLON Galactic Longitude 35- 41 F7.4 deg GLAT Galactic Latitude 43- 47 F5.2 mag Jmag ? 2MASS J band magnitude 49- 53 F5.2 mag Hmag ? 2MASS H band magnitude 55- 59 F5.2 mag Ksmag ? 2MASS Ks band magnitude 61- 65 F5.2 mag [3.6] ? Spitzer/IRAC 3.6 micron band magnitude 67- 71 F5.2 mag [4.5] ? Spitzer/IRAC 4.5 micron band magnitude 73- 77 F5.2 mag [5.8] ? Spitzer/IRAC 5.8 micron band magnitude 79- 83 F5.2 mag [8.0] ? Spitzer/IRAC 8.0 micron band magnitude 85- 89 F5.2 mag [24] ? Spitzer/MIPS 24 micron band magnitude 91- 95 F5.2 mag [70] ? Spitzer/MIPS 70 micron band magnitude 97-101 F5.2 --- SpIndex ? Infrared spectral index (1) 103-108 A6 --- Class Source classification (2)
Note (1): Slope of SED measured from 3.6 to 8.0 microns. Note (2): Class as follows: 0/I = likely protostars with infalling envelops II = disk-bearing stars III = Class III objects with very little circumstellar material Galaxy = contaminant (in table5) Shock = contaminant (in table5) See section 4.3 for further details.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 6 A6 --- [BNC2010] Pillar identification (VulPNN) 8- 12 F5.2 deg GLON Galactic longitude 14- 18 F5.2 deg GLAT Galactic latitude 20- 25 F6.2 deg RAdeg Right ascension in decimal degrees (J2000) 27- 31 F5.2 deg DEdeg Declination in decimal degrees (J2000) 33- 34 I2 arcmin amaj1 Size for the long axis 35 A1 --- --- [-] 36 I1 arcmin amaj2 ? Size range 38 A1 --- --- [x] 40- 42 F3.1 arcmin bmin1 Size for the shorter axis 43 A1 --- --- [-] 44 I1 arcmin bmin2 ? Size range 46- 48 I3 deg PA Position angle (given between the long axis of the pillar and the west axis, positive values are toward the north)
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Apr-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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