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J/ApJ/686/1195   IR photometry in the γ Vel cluster     (Hernandez+, 2008)

A Spitzer view of protoplanetary disks in the γ Velorum cluster. Hernandez J., Hartmann L., Calvet N., Jeffries R.D., Gutermuth R., Muzerolle J., Stauffer J. <Astrophys. J., 686, 1195-1208 (2008)> =2008ApJ...686.1195H
ADC_Keywords: Clusters, open ; Photometry, infrared ; Stars, dwarfs ; Stars, pre-main sequence Keywords: infrared: stars - open clusters and associations: individual (γ Velorum) - planetary systems: protoplanetary disks - stars: pre-main sequence Abstract: We present new Spitzer Space Telescope observations of stars in the young (∼5Myr) γ Velorum stellar cluster. Combining optical and 2MASS photometry, we have selected 579 stars as candidate members of the cluster. With the addition of the Spitzer mid-infrared data, we have identified five debris disks around A-type stars and five to six debris disks around solar-type stars, indicating that the strong radiation field in the cluster does not completely suppress the production of planetesimals in the disks of cluster members. However, we find some evidence that the frequency of circumstellar primordial disks is lower, and the infrared flux excesses are smaller than for disks around stellar populations with similar ages. Description: We have obtained NIR and mid-infrared photometry of the γ Velorum cluster using the four channels (3.6, 4.5, 5.8, and 8.0um) of the Infrared Array Camera (IRAC) and the 24um band of the Multiband Imaging Spectrometer for Spitzer (MIPS) on board the Spitzer Space Telescope. These data were collected during 2005 February 23 (IRAC) and April 10 (MIPS). CCD photometry was obtained with the 0.9m telescope at the Cerro Tololo Inter-American Observatory (CTIO). A region of 0.93x0.95deg2 centered on the γ Velorum system was surveyed in BVIc with short (20, 10, 6s) and long (300, 120, 60s) exposure times. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 159 579 Candidate members of the γ Velorum cluster
See also: I/280 : All-sky Compiled Catalogue of 2.5 million stars (Kharchenko+ 2009) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006) J/ApJ/638/897 : IR photometry in Trumpler 37 and NGC 7160 (Sicilia-Aguilar+, 2006) J/ApJ/651/L49 : Upper Sco OB association IRAC observations (Carpenter+, 2006) J/ApJ/662/1067 : Sptizer observations of sigma Orionis (Hernandez+, 2007) J/ApJ/671/1784 : Ori OB1 IRAC/MIPS observations (Hernandez+, 2007) J/ApJ/660/1532 : Spitzer/IRAC-MIPS survey of NGC 2244 (Balog+, 2007) J/ApJ/659/599 : IRAC and JHKs photometry of h and chi Persei (Currie+, 2007) J/ApJ/672/558 : MIPS observations of h and χ Persei (Currie+, 2008) J/ApJS/179/451 : Predicted IR excesses for protoplanetary disks (Kenyon+, 2008) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- ID Running identification number (<[HHC2008] NNN> in Simbad) 5- 20 A16 --- 2MASS 2MASS identification (HHMMSSss+DDMMSSs) 22- 27 F6.3 mag Jmag 2MASS J band magnitude 29- 33 F5.3 mag e_Jmag Uncertainty in Jmag 35- 40 F6.3 mag Hmag 2MASS H band magnitude 42- 46 F5.3 mag e_Hmag Uncertainty in Hmag 48- 53 F6.3 mag Ksmag 2MASS Ks band magnitude 55- 59 F5.3 mag e_Ksmag Uncertainty in Ksmag 61- 65 F5.2 mag Bmag The B band magnitude 67- 70 F4.2 mag e_Bmag Uncertainty in Bmag 72- 76 F5.2 mag Vmag The V band magnitude 78- 81 F4.2 mag e_Vmag Uncertainty in Vmag 83- 87 F5.2 mag Icmag ? The Ic band magnitude 89- 92 F4.2 mag e_Icmag ? Uncertainty in Imag 94- 95 A2 --- r_ID Optical photometry reference code: 1=this work; 2=Kharchenko 2009 (Cat. I/280) 97-101 F5.2 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude 103-106 F4.2 mag e_3.6mag Uncertainty in 3.6mag 108-112 F5.2 mag 4.5mag Spitzer/IRAC 4.5 micron band magnitude 114-117 F4.2 mag e_4.5mag Uncertainty in 4.5mag 119-123 F5.2 mag 5.8mag Spitzer/IRAC 5.8 micron band magnitude 125-128 F4.2 mag e_5.8mag Uncertainty in 5.8mag 130-134 F5.2 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude 136-139 F4.2 mag e_8.0mag Uncertainty in 8.0mag 141-145 F5.2 mJy F24 ? Spitzer/MIPS 24 micron band flux density 147-150 F4.2 mJy e_F24 ? Uncertainty in F24 152 I1 --- X [0/1] 1 for X-ray emission (counterpart in 2XMM catalog, Cat. IX/39) 154-159 A6 --- Disk Disk type (2)
Note (2): Disk type as follows: CIII = diskless; CII = optically thick disk; EV = evolved disk; PTD = pretransition disk candidate; DD = Debris disk candidate; Be = classical Be star Mgiant = Giant candidate based on 2MASS colors.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Jan-2011
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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