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J/AJ/138/1116            A Spitzer view of NGC 2264                (Sung+, 2009)

A Spitzer view of the young open cluster NGC 2264. Sung H., Stauffer J.R., Bessell M.S. <Astron. J., 138, 1116-1136 (2009)> =2009AJ....138.1116S
ADC_Keywords: Photometry, infrared ; Clusters, open ; Cross identifications ; YSOs Keywords: open clusters and associations: individual (NGC 2264) - planetary systems: protoplanetary disks - stars: formation - stars: pre-main sequence Abstract: We have performed mid-IR photometry of the young open cluster NGC 2264 using the images obtained with the Spitzer Space Telescope Infrared Array Camera and Multiband Imaging Photometer for Spitzer instruments and presented a normalized classification scheme of young stellar objects in various color-color diagrams to make full use of the information from multicolor photometry. These results are compared with the classification scheme based on the slope of the spectral energy distribution (SED). From the spatial distributions of Class I and II stars, we have identified two subclusterings of Class I objects in the CONE region of Sung et al. (Cat. J/AJ/135/441). The disked stars in the other star-forming region S Mon are mostly Class II objects. In addition, we have derived a somewhat higher value of the primordial disk fraction for NGC 2264 members located below the main pre-main-sequence locus (so-called BMS stars). This result supports the idea that BMS stars are young stars with nearly edge-on disks. Description: The Spitzer mapping observations were performed under program ID 37 (PI: G. Fazio) in 7x11 mosaics. The mapping of NGC 2264 was performed on 2004 March 6 and October 8, with a different spacecraft position angle at the two epochs. The observed region is slightly larger than the HALO region defined in Sung et al. (2008, Cat. J/AJ/135/441). The Astronomical Observation Requests (AORs) utilized for these maps were numbers 3956480, 3956736, 3956992, and 3957248. MIPS scanning of NGC 2264 was obtained on 2004 March 16 (PID 58) with the AOR number 4317184. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 165 21991 Catalog of sources detected with Spitzer Space Telescope IRAC and MIPS 24 micron table2.dat 117 43 Spitzer counterparts of X-ray sources without optical or 2MASS counterparts table3.dat 102 28 Variables detected in IRAC [3.6] and [4.5] table5.dat 82 10 New BMS star candidates (stars below the pre-main-sequence locus)
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/AJ/138/963 : NGC 2264 members vsini (Baxter+, 2009) J/AJ/135/441 : VRIHα photometry in NGC 2264 (Sung+, 2008) J/ApJ/671/605 : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007) J/AJ/134/999 : X-ray observations of NGC 2264 (Dahm+, 2007) J/ApJ/642/972 : IR photometry of a star-forming core in NGC 2264 (Young+, 2006) J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006) J/AJ/129/829 : Hα emission stars in NGC 2264 (Dahm+, 2005) J/A+A/430/1005 : VRIHα photometry of NGC 2264 variables (Lamm+, 2005) J/AJ/128/1684 : NGC 2264: VRIHα photometry (Sung+, 2004) J/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004) J/A+A/417/557 : Rotation + variability of PMS Stars in NGC 2264 (Lamm, 2004) J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004) J/AJ/123/1528 : UBV(RI)C and JHK photometry in NGC 2264 (Rebull+, 2002) J/A+A/355/651 : HRI observations of PMS stars in NGC 2264 (Flaccomio+, 2000) J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 I5 --- SST Running identification number (G1) 7 I1 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 16 F5.2 s RAs Second of Right Ascension (J2000) 18 A1 --- DE- Sign of Declination (J2000) 19- 20 I2 deg DEd Degree of Declination (J2000) 22- 23 I2 arcmin DEm Arcminute of Declination (J2000) 25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000) 30- 35 F6.3 mag [3.6] ? Spitzer/IRAC 3.6 micron band magnitude 37- 42 F6.3 mag [4.5] ? Spitzer/IRAC 4.5 micron band magnitude 44- 49 F6.3 mag [5.8] ? Spitzer/IRAC 5.8 micron band magnitude 51- 56 F6.3 mag [8.0] ? Spitzer/IRAC 8.0 micron band magnitude 58- 62 F5.3 mag [24] ? Spitzer/MIPS 24 micron band magnitude 64- 68 F5.3 mag e_[3.6] ? Uncertainty in [3.6] 70- 74 F5.3 mag e_[4.5] ? Uncertainty in [4.5] 76- 80 F5.3 mag e_[5.8] ? Uncertainty in [5.8] 82- 86 F5.3 mag e_[8.0] ? Uncertainty in [8.0] 88- 92 F5.3 mag e_[24] ? Uncertainty in [24] 94 I1 --- o_[3.6] Number of [3.6] observations 96 I1 --- o_[4.5] Number of [4.5] observations 98 I1 --- o_[5.8] Number of [5.8] observations 100 I1 --- o_[8.0] Number of [8.0] observations 102 I1 --- o_[24] Number of [24] observations 104 A1 --- Dup [D/T] Duplicity code (1) 106-113 A8 --- Mem Membership (2) 115-130 A16 --- 2MASS 2MASS identification (HHMMSSss+DDMMSSs) 132-151 A20 --- Sung Sung et al. identification(s) (G2) 153-165 A13 --- Note Counterparts of weak X-ray source (3)
Note (1): Code as follows: D = SST source having two optical counterparts within 2" searching radii; T = SST source having three optical counterparts within 2" searching radii. Note (2): IR classification (Class I, II, II/III, pre-TD (pre-transition disk), and TD(transition disk)) and other membership listed in Sung et al. (2008, Cat. J/AJ/135/441) as follows: H = Hα emission star, h = Hα emission candidate; X = X-ray emission star, x = X-ray emission candidate; + = Hα emission star with X-ray emission, - = Hα emission candidate with X-ray emission, E = strong Hα emission star from spectroscopy (EWHa≥10Å in Dahm & Simon (2005, Cat. J/AJ/129/829) or Hα index ≥2.5 in Reipurth et al. (2004, Cat. J/AJ/127/1117)), e = weak Hα emission star from spectroscopy (EWHa<10Å in Dahm & Simon (2005, Cat. J/AJ/129/829) or Hα index ≤2 in Reipurth et al. (2004, Cat. J/AJ/127/1117)); M = X-ray emission star with membership class "e", i.e. "M"="e"+"X". P = X-ray emission star with membership class "E", i.e. "P"="E"+"X"; p = X-ray candidate with membership class "E", i.e. "p"="E"+"x". Note (3): 30 IRAC sources as counterparts of weak X-ray sources with significance between 3.3 and 5.0.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 I5 --- SST Running identification number (G1) 7 I1 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 16 F5.2 s RAs Second of Right Ascension (J2000) 18 A1 --- DE- Sign of declination (J2000) 19 I1 deg DEd Degree of Declination (J2000) 21- 22 I2 arcmin DEm Arcminute of Declination (J2000) 24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000) 29- 34 F6.3 mag [3.6] ? Spitzer/IRAC 3.6 micron band magnitude 36- 41 F6.3 mag [4.5] Spitzer/IRAC 4.5 micron band magnitude 43- 48 F6.3 mag [5.8] ? Spitzer/IRAC 5.8 micron band magnitude 50- 55 F6.3 mag [8.0] ? Spitzer/IRAC 8.0 micron band magnitude 57- 61 F5.3 mag [24] ? Spitzer/MIPS 24 micron band magnitude 63- 67 F5.3 mag e_[3.6] ? Uncertainty in [3.6] 69- 73 F5.3 mag e_[4.5] Uncertainty in [4.5] 75- 79 F5.3 mag e_[5.8] ? Uncertainty in [5.8] 81- 85 F5.3 mag e_[8.0] ? Uncertainty in [8.0] 87- 91 F5.3 mag e_[24] ? Uncertainty in [24] 93 I1 --- o_[3.6] Number of [3.6] observations 95 I1 --- o_[4.5] Number of [4.5] observations 97 I1 --- o_[5.8] Number of [5.8] observations 99 I1 --- o_[8.0] Number of [8.0] observations 101 I1 --- o_[24] Number of [24] observations 103-108 A6 --- Class Object classification (Galaxy, I, II or II/III) 110-113 F4.1 --- Signi X-ray detection significance (1) 115-117 F3.1 arcsec Dist Distance Spitzer/X-ray
Note (1): X-ray detection significance from "pwdetect" (see Sung et al. 2004, Cat. J/AJ/128/1684; Flaccomio et al. 2006, Cat. J/A+A/455/903).
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- SST Running identification number (G1) 6 A1 --- f_SST [a] long exposure images used (1) 8- 13 F6.3 mag [3.6]6 ? Spitzer/IRAC 3.6 micron band magnitude on 2004 Mar 6 15- 19 F5.3 mag e_[3.6]6 ? Uncertainty in [3.6] 21- 26 F6.3 mag [3.6]8 ? Spitzer/IRAC 3.6 micron band magnitude on 2004 Oct 8 28- 32 F5.3 mag e_[3.6]8 ? Uncertainty in [3.6] 34- 39 F6.3 mag d[3.6] ? [3.6] difference 41- 46 F6.3 mag [4.5]6 ? Spitzer/IRAC [4.5 micron band magnitude on 2004 Mar 6 48- 52 F5.3 mag e_[4.5]6 ? Uncertainty in [4.5] 54- 59 F6.3 mag [4.5]8 ? Spitzer/IRAC 4.5 micron band magnitude on 2004 Oct 8 61- 65 F5.3 mag e_[4.5]8 ? Uncertainty in [4.5] 67- 72 F6.3 mag d[4.5] ? [4.5] difference 74- 79 A6 --- Class Infra-red classification (I, II or II/III) 81- 88 A8 --- Other Other classification (X or X+Halpha) 90-102 A13 --- OName Sung et al. identification(s) (G2)
Note (1): a = Used only data from long exposure images because short and long exposure images show large systematic differences probably due to the nearby bright star SST 13808.
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 5 I5 --- SST Running identification number (G1) 6 A1 --- n_SST [bc] Note on source (1) 8- 20 A13 --- OName Sung et al. identification(s) (G2) 22- 27 F6.3 mag [3.6] Spitzer/IRAC 3.6 micron band magnitude 29- 34 F6.3 mag [4.5] Spitzer/IRAC 4.5 micron band magnitude 36- 41 F6.3 mag [5.8] Spitzer/IRAC 5.8 micron band magnitude 43- 48 F6.3 mag [8.0] Spitzer/IRAC 8.0 micron band magnitude 50- 54 F5.3 mag [24] ? Spitzer/MIPS 24 micron band magnitude 56- 58 A3 --- Ha? [Yes/No/? ] Hα emission? 60- 61 A2 --- Class IR classification (I or II) 63- 67 F5.2 --- SED SED slope 69- 72 F4.2 --- e_SED SED uncertainty 74- 76 F3.1 --- Qcc Mean value of a YSO class Q_CC_ (2) 78- 82 F5.2 --- D.I Magnitude difference from the faint limit of the PMS locus in NGC 2264
Note (1): Flag as follows: b = If the actual optical counterpart of SST 10184 is C30962, then SST 10184 may be a SFG with PAH emission. See Section 2.5. c = Ogura (1984PASJ...36..139O) noted as an Hα emission star, but no signature of Hα emission from CCD photometry was detected. Note (2): The mean value of a YSO class (Cli) (call this quantity QCC) is: QCCiClixqixwiiqixwi where qi and wi are different weights. See section 3.1.
Global notes: Note (G1): Sources are <[SSB2009] SST NNNNN> for Simbad. Note (G2): Sung et al. 2008, Cat. J/AJ/135/441 identification(s). [CWS]NNNNN format are <Cl* NGC 2264 [CWS]ID [CWS]NNNNN> for Simbad.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 20-Jan-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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