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J/ApJ/659/599   IRAC and JHKs photometry of h and chi Persei (Currie+, 2007)

Spitzer IRAC and JHKs observations of h and chi Persei: constraints on protoplanetary disk and massive cluster evolution at ∼107 years. Currie T., Balog Z., Kenyon S.J., Rieke G., Prato L., Young E.T., Muzerolle J., Clemens D.P., Buie M., Sarcia D., Grabu A., Tollestrup E.V., Taylor B., Dunham E., Mace G. <Astrophys. J., 659, 599-615 (2007)> =2007ApJ...659..599C
ADC_Keywords: Clusters, open ; Photometry, infrared Keywords: circumstellar matter - infrared: stars - open clusters and associations: individual (NGC 869, NGC 884) Abstract: We describe IRAC 3.6-8um observations and ground-based near-IR JHKs photometry from Mimir and 2MASS of the massive double cluster h and chi Persei complete to J=15.5 (M∼1.3M). Within 25' of the cluster centers we detect ∼11000 sources with J≤15.5, ∼7000 sources with [4.5]≤15, and ∼5000 sources with [8]≤14.5. In both clusters the surface density profiles derived from the 2MASS data decline with distance from the cluster centers as expected for a bound cluster. Within 15' of the cluster centers, ∼50% of the stars lie on a reddened ∼13Myr isochrone; at 15'-25' from the cluster centers, ∼40% lie on this isochrone. Thus, the optical/2MASS color-magnitude diagrams indicate that h and chi Per are accompanied by a halo population with roughly the same age and distance as the two dense clusters. Description: We downloaded data for h and chi Per from the 2MASS point source catalog (PSC) using the IRSA Web interface at IPAC. The relatively low spatial resolution and the shallow peaks in the JHKs magnitude distributions of the 2MASS data prompted us to acquire additional near-IR photometry. We used Mimir, a multifunction IR instrument at the f/17 focus of the 1.8m Perkins telescope at Lowell Observatory, and made 25 observations between 2005 Nov 4-5 and Dec 5. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 113 31265 h & chi Persei data
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) V/27 : Proper Motions and UBV Photometry in h+chi Per (Muminov 1980) J/AJ/122/248 : h and chi Per UBVI,Hα photometry (Keller+, 2001) J/A+A/394/479 : uvbyβ photometry of h and chi Per (Capilla+, 2002) J/ApJ/576/880 : CCD UBV photometry of h and χ Per (Slesnick+, 2002) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 8- 15 F8.4 deg DEdeg Declination in decimal degrees (J2000) (1) 17- 22 F6.3 mag Jmag The J band magnitude 24- 29 F6.3 mag Hmag The H band magnitude 31- 36 F6.3 mag Ksmag The Ks band magnitude 38- 43 F6.3 mag 3.6m ?=99.000 Spitzer/IRAC 3.6micron magnitude (2) 45- 50 F6.3 mag 4.5m ?=99.000 Spitzer/IRAC 4.5micron magnitude (2) 52- 57 F6.3 mag 5.8m ?=99.000 Spitzer/IRAC 5.8micron magnitude (2) 59- 64 F6.3 mag 8.0m ?=99.000 Spitzer/IRAC 8.0micron magnitude (2) 67- 71 F5.3 mag e_Jmag The 1σ error in Jmag 74- 78 F5.3 mag e_Hmag The 1σ error in Hmag 81- 85 F5.3 mag e_Ksmag The 1σ error in Ksmag 87- 92 F6.3 mag e_3.6m ?=99.000 The 1σ error in 3.6m (2) 94- 99 F6.3 mag e_4.5m ?=99.000 The 1σ error in 4.5m (2) 101-106 F6.3 mag e_5.8m ?=99.000 The 1σ error in 5.8m (2) 108-113 F6.3 mag e_8.0m ?=99.000 The 1σ error in 8.0m (2)
Note (1): Objects identified as [CBK2007b] DD.dddd+DD.dddd in Simbad. Note (2): 99.000 = unknown value.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 25-Jan-2009
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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