J/AJ/135/1395 omega Cen Spitzer photometry (Boyer+, 2008)
A Spitzer Space Telescope Atlas of omega Centauri: the stellar population,
mass loss, and the intracluster medium.
Boyer M.L., McDonald, I., van Loon J.T., Woodward C.E., Gehrz R.D.,
Evans A., Dupree A.K.
<Astron. J. 135, 1395 (2008)>
=2008AJ....135.1395B 2008AJ....135.1395B
ADC_Keywords: Clusters, globular ; Infrared sources ; Photometry, infrared
Keywords: globular clusters: individual (omega Centauri) - infrared: general -
stars: AGB and post-AGB - stars: mass loss - ISM: evolution
Abstract:
We present a Spitzer Space Telescope imaging survey of the most
massive Galactic globular cluster, ω Centauri, and investigate
stellar mass loss at low metallicity and the intracluster medium
(ICM). The survey covers approximately 3.2x the cluster half-mass
radius at 3.6, 4.5, 5.8, 8, and 24um, resulting in a catalog of over
40000 point sources in the cluster.
Description:
This catalog presents photometry of more than 40000 sources in
ω Centauri at 3.6, 4.5, 5.8, 8, and 24 microns from the Spitzer
Space Telescope. The catalog also includes a note indicating whether a
source is a candidate galaxy, asymptotic giant branch (AGB) star,
anomalous RGB (RGB-a) star, or horizontal branch (HB) star.
Membership information from van Leeuwen et al. (2000, J/A+A/360/472)
is included along with the Leiden identification numbers (LEID). The
catalog also includes a note indicating whether a source is
super-Ba-rich, CN-rich, and/or is an M-type (M), carbon (C), or
post-AGB (P) star, as identified by van Loon et al.
(2007MNRAS.382.1353V 2007MNRAS.382.1353V).
Objects:
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RA (2000) DE Designation(s)
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13 26 45.9 -47 28 37 NGC 5139 = omega Centauri
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 115 49368 ω Centauri Spitzer photometry
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Seq Running source number
7- 13 A7 --- --- [SSTOCEN]
15- 34 A20 --- SSTOCEN Source identification (JHHMMSS.ss-DDMMSS.ss)
36- 40 F5.2 mag 3.6mag ? Spitzer/IRAC 3.6 micron band magnitude
42- 45 F4.2 mag e_3.6mag ? Uncertainty in 3.6mag
47- 51 F5.2 mag 4.5mag ? Spitzer/IRAC 4.5 micron band magnitude
53- 56 F4.2 mag e_4.5mag ? Uncertainty in 4.5mag
58- 62 F5.2 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude
64- 67 F4.2 mag e_5.8mag ? Uncertainty in 5.8mag
69- 73 F5.2 mag 8.0mag ? Spitzer/IRAC 8.0 micron band magnitude
75- 78 F4.2 mag e_8.0mag ? Uncertainty in 8.0mag
80- 84 F5.2 mag 24mag ? Spitzer/MIPS 24 micron band magnitude
86- 89 F4.2 mag e_24mag ? Uncertainty in 24mag
91- 93 I3 % Mem ? van Leeuwen et al. (2000, J/A+A/360/472)
membership likelihood (1)
95-100 A6 --- Cand Candidate identification (2)
102-109 A8 --- Note Source note (3)
111-115 I5 --- LEID ? The LEID identification number (4)
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Note (1): Quoted as a percentage from van Leeuwen et al. (2000, J/A+A/360/472)
Note (2): Candidate AGB, RGB-a, and HB stars and candidate galaxies are
identified by their positions on optical and Spitzer CMDs.
Note (3): Specifies whether a source is as follows:
CN = CN-rich star
BA = super-Ba-rich star
CN/Ba = CN/Ba rich star
M = M-type star
C = carbon star
P = post-AGB star, as indicated by optical spectra
(van Loon et al., 2007MNRAS.382.1353V 2007MNRAS.382.1353V)
B24 = source potentially affected by blending at 24 microns
(see Sect. 3.2)
Note (4): Assigned to Spitzer sources via cross-identification with
van Leeuwen et al. (2000, J/A+A/360/472).
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Acknowledgements:
Martha L. Boyer, mboyer(at)astro.umn.edu
(End) Patricia Vannier [CDS] 17-Jan-2008