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J/ApJ/651/L49     Upper Sco OB association IRAC observations  (Carpenter+, 2006)

Evidence for mass-dependent circumstellar disk evolution in the 5Myr old upper Scorpius OB association. Carpenter J.M., Mamajek E.E., Hillenbrand L.A., Meyer M.R. <Astrophys. J., 651, L49-L52 (2006)> =2006ApJ...651L..49C
ADC_Keywords: Associations, stellar ; Photometry, infrared Keywords: open clusters and associations: individual (Upper Scorpius OB1) - planetary systems: protoplanetary disks - stars: pre-main-sequence Abstract: We present 4.5, 8 and 16um photometry from the Spitzer Space Telescope for 204 stars in the Upper Scorpius OB association. The data are used to investigate the frequency and properties of circumstellar disks around stars with masses between 0.1 and 20 at an age of 5Myr. We identify 35 stars that have emission at 8 or 16um in excess of the stellar photosphere. Description: IRAC (4.5 and 8um) observations for 204 stars and IRS peak-up-imaging (PUI; 16m) data for 195 stars were obtained with the Spitzer Space Telescope. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 120 218 Observed IRAC and IRS Fluxes Source
See also: J/PASP/118/1690 : Spitzer solar-type stars list (Meyer+, 2006) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 A1 --- Flag [ab] a: from this study, b: from FEPS (Meyer et al., 2006, Cat. J/PASP/118/1690 3- 33 A31 --- Source Source name 35- 42 A8 --- SpType MK spectral type 44- 46 A3 --- r_SpType Reference for spectral type (1) 48- 55 I8 --- Obs4.5um Spitzer observation number for 4.5um 57- 64 F8.2 mJy S4.5um IRAC 4.5um flux (2) 65- 70 F6.2 mJy e_S4.5um rms uncertainty on S4.5um 72- 79 I8 --- Obs8um Spitzer observation number for 8um 81- 87 F7.2 mJy S8um IRAC 8um flux (3) 89- 93 F5.2 mJy e_S8um rms uncertainty on S8um 94 A1 --- f_S8um [s] s for saturated 95-102 I8 --- Obs16um ? Spitzer observation number for 16um 104-109 F6.2 mJy S16um ? IRAC 16um flux (4) 110 A1 --- n_S16um [e] Note on S16um (5) 112-115 F4.2 mJy e_S16um ? rms uncertainty on S16um 117 A1 --- E8 [Y/N] 8um excess? 119 A1 --- E16 [Y/N?] 16um excess? 120 A1 --- n_E16 [f] Note on E16um (5)
Note (1): References as follows: H82 = Houk, 1982, Cat. III/80 H88 = Houk, 1988, Cat. III/133 K99 = Kunkel, 1999, Ph.D. thesis, Julius-Maximilians-Univ., Wuerzburg K00 = Koehler et al., 2000, Cat. J/A+A/356/541 MML = Mamajek, Meyer & Liebert, unpublished P98 = Preibisch et al, 1998, Cat. J/A+A/333/619 P01 = Preibisch et al., 2001, Cat. J/AJ/121/1040 P02 = Preibisch et al., 2002, Cat. J/AJ/124/404 W94 = Walter et al., 1994AJ....107..692W Note (2): IRAC 4.5um photometry measured using a flux calibration factor of 0.1388MJy/sr/(DN/s). Note (3): IRAC 8um photometry measured using a flux calibration factor of 0.2021MJy/sr/(DN/s). Note (4): IRS 16um PUI photometry measured using a flux calibration factor of 0.01375MJy/sr/(e-/s). Saturated sources are listed as sat. Note (5): Note as follows: e = Aperture curve of growth deviates from a point source by more than 4% f = ScoPMS 17 is not considered an excess source for this study since the apparent 16 excess is likely from a nearby source that falls partially within the measurement aperture.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 22-Jul-2008
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