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J/ApJ/698/1989           Spitzer survey of NGC 2451               (Balog+, 2009)

Spitzer/IRAC-MIPS survey of NGC 2451A and B: debris disks at 50-80 million years. Balog Z., Kiss L.L., Vinko J., Rieke G.H., Muzerolle J., Gaspar A., Young E.T., Gorlova N. <Astrophys. J., 698, 1989-2013 (2009)> =2009ApJ...698.1989B
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared ; Stars, luminous Keywords: circumstellar matter - infrared: stars - open clusters and associations: individual (NGC 2451) - planetary systems: protoplanetary disks Abstract: We present a Spitzer IRAC and MIPS survey of NGC 2451A and B, two open clusters in the 50-80Myr age range. We complement these data with extensive ground-based photometry and spectroscopy to identify the cluster members in the Spitzer survey field. We find only two members with 8um excesses. The incidence of excesses at 24um is much higher, i.e., 11 of 31 solar-like stars and 1 of 7 early-type (A) stars. This work nearly completes the debris disk surveys with Spitzer of clusters in the 30-130Myr range. This range is of interest because it is when large planetesimal collisions may have still been relatively common (as indicated by the one that led to the formation of the Moon during this period of the evolution of the solar system). We review the full set of surveys and find that there are only three possible cases out of about 250 roughly solar-mass stars where very large excesses suggest that such collisions have occurred recently. Description: Observations of NGC 2451 were obtained on 2004 March 2 with IRAC. The IRAC survey covers about 0.6deg2 centered on HD 63032, a K2.5Ib star. The MIPS 24um survey was obtained on 2004 April 11. It covers about 0.8deg2 centered on the same position as the IRAC survey. The optical observations, through Johnson-Cousins UBVRI filters, were made with the SITe 2048-6 CCD camera attached to the 1.5m telescope at Cerro Tololo Inter-American Observatory (CTIO) on 2003 January 22, 23, and 24. We acquired AAOmega spectrograph data using the Anglo-Australian Telescope at Siding Spring, Australia on three nights, 2008 February 15, 16, and 17. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 128 70 UBVRIJHK photometry of the members of NGC2451A table4.dat 128 131 UBVRIJHK photometry of the members of NGC2451B table5.dat 89 70 Spitzer 3.6-24um photometry of members of NGC2451A table6.dat 89 131 Spitzer 3.6-24um photometry of members of NGC2451B table7.dat 46 14 Measured and predicted photospheric (K-[24])0 colors of cluster members with 24um excesses
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) J/A+A/402/571 : X-ray study of NGC 2451 A and B. (Huensch+ 2003) J/AJ/122/1486 : NGC 2451A proper motions and membership (Platais+, 2001) J/A+A/341/469 : Geneva photometry of NGC 2451 and HR 2968 (Carrier+ 1999) Byte-by-byte Description of file: table[34].dat
Bytes Format Units Label Explanations
1 A1 --- Ref [HP] Membership reference (1) 3- 11 F9.5 deg RAdeg Right Ascension in degrees (J2000) 13- 21 F9.5 deg DEdeg Declination in degrees (J2000) 23- 24 I2 --- e24 [6,19]? The 24µm excess source from Table 7 26- 31 F6.3 mag Umag ? The Johnson U band magnitude 33- 37 F5.3 mag e_Umag ? The 1σ error in Umag 39- 44 F6.3 mag Bmag ? The Johnson B band magnitude 46- 50 F5.3 mag e_Bmag ? The 1σ error in Bmag 52- 57 F6.3 mag Vmag The Johnson V band magnitude 59- 63 F5.3 mag e_Vmag ? The 1σ error in Vmag 65- 70 F6.3 mag Rcmag ? The Cousins R band magnitude 72- 76 F5.3 mag e_Rcmag ? The 1σ error in Rcmag 78- 83 F6.3 mag Icmag ? The Cousins I band magnitude 85- 89 F5.3 mag e_Icmag ? The 1σ error in Icmag 91- 96 F6.3 mag Jmag 2MASS Johnson J band magnitude 98-102 F5.3 mag e_Jmag ? The 1σ error in Jmag 104-109 F6.3 mag Hmag 2MASS Johnson H band magnitude 111-115 F5.3 mag e_Hmag ? The 1σ error in Hmag 117-122 F6.3 mag Ksmag 2MASS Johnson Ks band magnitude 124-128 F5.3 mag e_Ksmag ? The 1σ error in Ksmag
Note (1): Reference as follows: P = Platais et al. (2001, Cat. J/AJ/122/1486; <Cl* NGC 2451 PKB NNNN> in Simbad); H = Hunsch et al. (2003, Cat. J/A+A/402/571; <[HWS2003] XNNN> in Simbad).
Byte-by-byte Description of file: table[56].dat
Bytes Format Units Label Explanations
1 A1 --- Ref [HP] Membership reference (1) 3- 11 F9.5 deg RAdeg Right Ascension in degrees (J2000) 13- 21 F9.5 deg DEdeg Declination in degrees (J2000) 23- 24 I2 --- e24 [6,19]? The 24µm excess source from Table 7 26- 31 F6.3 mag [3.6] ? Spitzer/IRAC 3.6µm band magnitude 33- 37 F5.3 mag e_[3.6] ? The 1σ error in 3.6µm mag 39- 44 F6.3 mag [4.5] ? Spitzer/IRAC 4.5µm band magnitude 46- 50 F5.3 mag e_[4.5] ? The 1σ error in 4.5µm mag 52- 57 F6.3 mag [5.8] ? Spitzer/IRAC 5.8µm band magnitude 59- 63 F5.3 mag e_[5.8] ? The 1σ error in 5.8µm mag 65- 70 F6.3 mag [8.0] ? Spitzer/IRAC 8.0µm band magnitude 72- 76 F5.3 mag e_[8.0] ? The 1σ error in 8.0µm mag 78- 83 F6.3 mag [24] ? Spitzer/MIPS 24µm band magnitude 85- 89 F5.3 mag e_[24] ? The 1σ error in 24µm mag
Note (1): Reference as follows: P = Platais et al. (2001, Cat. J/AJ/122/1486; <Cl* NGC 2451 PKB NNNN> in Simbad); H = Hunsch et al. (2003, Cat. J/A+A/402/571; <[HWS2003] XNNN> in Simbad).
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 2 I2 --- e24 [6-19] Identification number (<[BKV2009] NN> in Simbad) 4 A1 --- Comp [AB] NGC 2451 component 6- 14 F9.5 deg RAdeg Right ascension in decimal degrees (J2000) 16- 24 F9.5 deg DEdeg Declination in decimal degrees (J2000) 26- 30 F5.3 mag K-[24] Measured (K-[24])0 color index 32- 36 F5.3 mag e_K-[24] K-[24] uncertainty 38- 43 F6.3 mag K-[24]p Predicted photospheric K-[24] color index 45- 46 I2 --- Sigma sigma significance of the excess (1)
Note (1): The significance was calculated using the photometric errors and the rms around this locus.
Nomenclature note: Tables 3-6: stars are <[BKV2009] DDD.ddddd+DD.ddddd> in Simbad. History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Jun-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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