J/ApJ/671/1784 Ori OB1 IRAC/MIPS observations (Hernandez+, 2007)
Spitzer observations of the Orion OB1 association:
disk census in the low-mass stars.
Hernandez J., Calvet N., Briceno C., Hartmann L., Vivas A.K., Muzerolle J.,
Downes J., Allen L., Gutermuth R.
<Astrophys. J., 671, 1784-1799 (2007)>
=2007ApJ...671.1784H 2007ApJ...671.1784H
ADC_Keywords: Associations, stellar ; Photometry, millimetric/submm
Keywords: infrared: stars -
open clusters and associations: individual (Orion OB1 association) -
planetary systems: protoplanetary disks - stars: pre-main sequence
Abstract:
We present new Spitzer observations of two fields in the Orion OB1
association. We report IRAC/MIPS observations for 115 confirmed
members and 41 photometric candidates of the ∼10Myr 25 Orionis
aggregate in the OB1a subassociation, and 106 confirmed members and 65
photometric candidates of the 5Myr region located in the OB1b
subassociation.
Description:
We have obtained near-infrared (NIR) and mid-infrared photometry of
two regions in the Orion OB1 association using the four channels (3.6,
4.5, 5.8, and 8.0um) of the InfraRed Array Camera (IRAC), and the 24um
band of the Multiband Imaging Spectrometer (MIPS), on board the
Spitzer Space Telescope.
Optical (V and Ic) magnitudes were obtained from the CIDA Variability
Survey which is being carried out using the QUEST I camera installed
on the Jurgen Stock Telescope (a celar aperture 1m Schmidt Telescope)
at the Venezuela National Astronomical Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 118 115 Members of the 25 Orionis aggregate (OB1a
sub-association)
table2.dat 118 107 Members of the OB1b sub-association
table3.dat 132 41 Photometric candidates of the 25 Orionis aggregate
table4.dat 136 65 Photometric candidates of the OB1b sub-association
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See also:
II/36 : UBV & uvby-beta obs. of Orion OB1 Association (Warren+ 1977)
J/A+A/289/101 : Orion OB1 association. I. (Brown+, 1994)
J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005)
Byte-by-byte Description of file: table[12].dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- OB1 [OB1ab] sub-association designation (G1)
6- 9 I4 --- Seq Source identification (G1)
11- 26 A16 --- 2MASS 2MASS source identification, HHMMSSss+DDMMSSs
28- 35 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
37- 44 F8.5 deg DEdeg Declination in decimal degrees (J2000)
46- 51 F6.3 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
53- 57 F5.3 mag e_3.6mag Uncertainty in 3.6mag
59- 64 F6.3 mag 4.5mag Spitzer/IRAC 4.5 micron band magnitude
66- 70 F5.3 mag e_4.5mag Uncertainty in 4.5mag
72- 77 F6.3 mag 5.8mag Spitzer/IRAC 5.8 micron band magnitude
79- 83 F5.3 mag e_5.8mag Uncertainty in 5.8mag
85- 90 F6.3 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude
92- 96 F5.3 mag e_8.0mag Uncertainty in 8.0mag
98-102 F5.2 mag 24mag ? Spitzer/MIPS 24 micron band magnitude
104-107 F4.2 mag e_24mag ? Uncertainty in 24mag
109 I1 --- Ref Optical reference (1)
111-118 A8 --- DType Disk type (G2)
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Note (1): References as follows:
1 = Briceno et al. (2005, Cat. J/AJ/129/907)
2 = Briceno et al. (2007, Cat. J/ApJ/661/1119)
3 = Briceno et al. (2007, in Protostars and Planets V, ed. B. Reipurth,
D. Jewitt, and K. Keil (Tucson: Univ. Arizona Press), 345
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Byte-by-byte Description of file: table[34].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 4 A4 --- OB1 [OB1ab] sub-association designation (G1)
6- 9 I4 --- Seq Source identification (G1)
11- 26 A16 --- 2MASS The 2MASS source identification,
HHMMSSss+DDMMSSs
28- 35 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
37- 44 F8.5 deg DEdeg Declination in decimal degrees (J2000)
46- 51 F6.3 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
53- 57 F5.3 mag e_3.6mag Uncertainty in 3.6mag
59- 64 F6.3 mag 4.5mag Spitzer/IRAC 4.5 micron band magnitude
66- 70 F5.3 mag e_4.5mag Uncertainty in 4.5mag
72- 77 F6.3 mag 5.8mag Spitzer/IRAC 5.8 micron band magnitude
79- 83 F5.3 mag e_5.8mag Uncertainty in 5.8mag
85- 90 F6.3 mag 8.0mag Spitzer/IRAC 8.0 micron band magnitude
92- 96 F5.3 mag e_8.0mag Uncertainty in 8.0mag
98-101 F4.2 mag 24mag ? Spitzer/MIPS 24 micron band magnitude
103-106 F4.2 mag e_24mag ? Uncertainty in 24mag
108-112 F5.2 mag Vmag The V band magnitude from the CIDA survey
114-117 F4.2 mag e_Vmag Uncertainty in Vmag
119-122 F4.2 mag V-I The V-I colour index from the CIDA survey
124-127 F4.2 mag e_V-I Uncertainty in V-I
129-136 A8 --- DType Disk type (G2)
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Global notes:
Note (G1): members or candidates of "OB1a" sub-association identified as
[HCB2007] OB1a NNN (tables 1 and 3);
members or candidates of "OB1b" sub-association identified as
[HCB2007] OB1b NNN (tables 2 and 4).
Note (G2): Disk type code is:
CIII = disk less star
CII = optically thick disk
EV = evolved disk
TD = transitional disk candidate
disk[8]? = excess at 8 micron but no MIPS detections
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 29-Mar-2010