J/ApJ/672/558 MIPS observations of h and χ Persei (Currie+, 2008)
The rise and fall of debris disks: MIPS observations of h and χ Persei and the evolution of Mid-IR emission from planet formation. Currie T., Kenyon S.J., Balog Z., Rieke G., Bragg A., Bromley B. <Astrophys. J., 672, 558-574 (2008)> =2008ApJ...672..558C
ADC_Keywords: Clusters, open ; Photometry, millimetric/submm ; Photometry, infrared Keywords: circumstellar matter - infrared: stars - open clusters and associations: individual (NGC 869, NGC 884) - planetary systems: formation - planetary systems: protoplanetary disks Abstract: We describe Spitzer MIPS observations of the double cluster, h and χ Persei, covering a ∼0.6deg2 area surrounding the cores of both clusters. The data are combined with IRAC and 2MASS data to investigate ∼616 sources from 1.25-24um. We use the long-baseline Ks- color to identify two populations with IR excess indicative of circumstellar material: Be stars with 24um excess from optically thin free-free emission, and 17 fainter sources (J∼14-15) with  excess consistent with a circumstellar disk. The frequency of IR excess for the fainter sources increases from 4.5 to 24um. The IR excess is likely due to debris from the planet formation process. The wavelength-dependent behavior is consistent with an inside-out clearing of circumstellar disks. A comparison of the 24um excess population in h and χ Per sources with results for other clusters shows that 24um emission from debris disks "rises" from 5 to 10Myr, peaks at ∼10-15Myr, and then "falls" from ∼15-20Myr to 1Gyr. Description: We acquired MIPS 24um data using 80s exposures in scan mode, covering two 0.3deg2 regions centered on the two clusters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 128 616 MIPS sources with 2MASS/IRAC counterparts in h+χ Persei table2.dat 67 57 Stars/candidates and selected evolved stars with 24um excess in h and χ Per
See also: J/ApJ/576/880 : CCD UBV photometry of h and χ Per (Slesnick+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
2- 8 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) (1) 10- 16 F7.4 deg DEdeg Declination in decimal degrees (J2000) (1) 18- 23 F6.3 mag Vmag ?=99.000 The V band magnitude (2) 25- 30 F6.3 mag B-V ?=99.000 The (B-V) color index (2) 32- 37 F6.3 mag U-B ?=99.000 The (U-B) color index (2) 39- 44 F6.3 mag Jmag ?=99.000 2MASS J band magnitude (2) 46- 51 F6.3 mag Hmag ?=99.000 2MASS H band magnitude (2) 53- 58 F6.3 mag Ksmag ?=99.000 2MASS Ks band magnitude (2) 60- 65 F6.3 mag 3.6mag ?=99.000 IRAC 3.6 micron band magnitude (2) 67- 72 F6.3 mag 4.5mag ?=99.000 IRAC 4.5 micron band magnitude (2) 74- 79 F6.3 mag 5.8mag ?=99.000 IRAC 5.8 micron band magnitude (2) 81- 86 F6.3 mag 8.0mag ?=99.000 IRAC 8 micron band magnitude (2) 88- 93 F6.3 mag 24mag ?=99.000 MIPS 24 micron band magnitude (2) 95-100 F6.3 mag e_3.6mag ?=99.000 The 1σ error in 3.6mag (2) 102-107 F6.3 mag e_4.5mag ?=99.000 The 1σ error in 4.5mag (2) 109-114 F6.3 mag e_5.8mag ?=99.000 The 1σ error in 5.8mag (2) 116-121 F6.3 mag e_8.0mag ?=99.000 The 1σ error in 8.0mag (2) 123-128 F6.3 mag e_24mag ?=99.000 The 1σ error in 24mag (2)
Note (1): Sources identified as [CKB2008] DD.dddd+DD.dddd in Simbad. Note (2): Optical UBV photometry from Slesnick et al. (2002, Cat. J/ApJ/576/880); errors in the 2MASS JHKs filters are ~<0.05 for sources except the ∼21 fainter (J∼14-15) sources. Values of 99.000 denote sources that were not observed in the given filter at the 5σ level.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [CKB2008] Sequential number (1) 4- 7 I4 --- Num ?=99 Oosterhoff (1937AnLei..17a...1O) number 9- 15 A7 --- SpType MK spectral type (2) 17- 23 F7.4 deg RAdeg Right Ascension in decimal degrees (J2000) 25- 31 F7.4 deg DEdeg Declination in decimal degrees (J2000) 33- 37 F5.2 mag Vmag ?=99.00 The V band magnitude 39- 43 F5.2 mag Jmag ?=99.00 2MASS J band magnitude 45- 49 F5.2 mag Hmag ?=99.00 2MASS H band magnitude 51- 55 F5.2 mag Ksmag ?=99.00 2MASS Ks band magnitude 57- 61 F5.2 mag 8.0mag ?=99.00 IRAC 8 micron band magnitude 63- 67 F5.2 mag 24mag ?=99.00 MIPS 24 micron band magnitude
Note (1): The first twenty entries are confirmed Be stars from Bragg and Kenyon (2002AJ....124.3289B) and have Oosterhoff (1937AnLei..17a...1O) numbers. Slesnick et al. (2002, Cat. J/ApJ/576/880) identify an additional Be star in lower density regions surrounding the center of h and χ Per (source number 23). All the other stars (referred to as "candidate Be stars" in the text) are either supergiants, foreground stars, or B-type cluster members from either Slesnick et al. (source 21) or archived spectroscopic data from FAST (the five other sources). Note (2): All sources with the "e" designation in spectral type are Be stars.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 06-Apr-2010
|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|