J/ApJ/658/1264 IR-excess sources in GLIMPSE and MSX (Uzpen+, 2007)
The frequency of mid-infrared excess sources in Galactic surveys.
Uzpen B., Kobulnicky H.A., Monson A.J., Pierce M.J., Clemens D.P.,
Backman D.E., Meade M.R., Babler B.L., Indebetouw R., Whitney B.A.,
Watson C., Wolfire M.G., Benjamin R.A., Bracker S., Bania T.M., Cohen M.,
Cyganowski C.J., Devine K.E., Heitsch F., Jackson J.M., Mathis J.S.,
Mercer E.P., Povich M.S., Rho J., Robitaille T.P., Sewilo M., Stolovy S.R.,
Watson D.F., Wolff M.J., Churchwell E.
<Astrophys. J., 658, 1264-1288 (2007)>
=2007ApJ...658.1264U 2007ApJ...658.1264U
ADC_Keywords: Infrared sources ; Photometry, infrared ;
Photometry, millimetric/submm
Keywords: circumstellar matter - planetary systems
Abstract:
We have identified 230 Tycho-2 Spectral Catalog stars that exhibit 8um
mid-IR extraphotospheric excesses in the MSX and Spitzer GLIMPSE
surveys. Of these, 183 are either OB stars earlier than B8 in which
the excess plausibly arises from a thermal bremsstrahlung component or
evolved stars in which the excess may be explained by an atmospheric
dust component. The remaining 47 stars have spectral classifications
B8 or later and appear to be main-sequence or late pre-main-sequence
objects harboring circumstellar disks. Six of the 47 stars exhibit
multiple signatures characteristic of pre-main-sequence circumstellar
disks, including emission lines, near-IR K-band excesses, and X-ray
emission. Approximately one-third of the remaining 41 sources have
emission lines suggesting relative youth. We modeled the excesses in
26 stars having two or more measurements in excess of the expected
photospheres as single-component blackbodies.
Description:
We obtained optical spectroscopy of a small subset of 38 stars from
the GLIMPSE sample at declinations higher than -20° with the
WIRO-Spec instrument on the Wyoming Infrared Observatory (WIRO) on the
nights of 2005 September 17-19.
We also obtained optical spectroscopy of an additional subsample of 27
stars from the GLIMPSE sample using the WIRO-Longslit spectrograph on
the night of 2005 November 20.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 148 12 Revised spectral/luminosity classes
table2.dat 120 28 Photometric parameters for main-sequence stars
B8 or later with Mid-IR excesses from GLIMPSE
table3.dat 120 139 Photometric parameters for main-sequence stars
earlier then B8 and post-main-sequence stars
Mid-IR excesses from GLIMPSE
table4.dat 121 19 Photometric parameters for main-sequence stars
B8 or later with mid-IR excesses from MSX
table5.dat 121 44 Photometric parameters for main-sequence stars
earlier than B8 with mid-IR excesses from MSX
table6.dat 48 28 24um photometry for source in table2
table7.dat 148 47 Derived parameters for mid-IR excess sources
later than B8 in GLIMPSE and MSX
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See also:
II/293 : GLIMPSE Source Catalog (I + II + 3D) (IPAC 2008)
III/231 : The Tycho-2 Spectral Type Catalog (Wright+, 2003)
V/114 : MSX6C Infrared Point Source Catalog (Egan+ 2003)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Gname GLIMPSE/MSX identification (GLLL.llll+BB.bbbb)
19- 28 A10 --- Sp.T Tycho spectral catalog classification (III/231)
30- 38 A9 --- Sp.rev Revised classification from WIRO observations
40-148 A109 --- Notes Classification Basis
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Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential star number
5- 21 A17 --- Gname GLIMPSE identification (Cat. II/293)
23- 31 A9 --- SpT MK spectral type
33- 37 F5.2 mag Vmag V magnitude
39- 43 F5.2 mag Bmag B magnitude
45- 49 F5.2 mag Jmag ?=- 2MASS J magnitude
51- 54 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
56- 60 F5.2 mag Hmag ?=- 2MASS H magnitude
62- 65 F4.2 mag e_Hmag ?=- rms uncertainty on Hmag
67- 71 F5.2 mag Kmag 2MASS K magnitude
73- 76 F4.2 mag e_Kmag rms uncertainty on Kmag
78- 82 F5.2 mag [3.6] ?=- IRAC 3.6um magnitude (1)
84- 87 F4.2 mag e_[3.6] ?=- rms uncertainty on [3.6]
89- 93 F5.2 mag [4.5] ?=- IRAC 4.5um magnitude (1)
95- 98 F4.2 mag e_[4.5] ?=- rms uncertainty on [4.5]
100-104 F5.2 mag [5.8] IRAC 5.8um magnitude
106-109 F4.2 mag e_[5.8] rms uncertainty on [5.8]
111-115 F5.2 mag [8.0] IRAC 8.0um magnitude
117-120 F4.2 mag e_[8.0] rms uncertainty on [8.0]
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Note (1): No data when saturated band not nondetection.
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Byte-by-byte Description of file: table[45].dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential star number
5- 21 A17 --- Gname MSX6C identification (Cat. V/114)
23- 32 A10 --- SpT MK spectral type
33- 37 F5.2 mag Vmag V magnitude
39- 43 F5.2 mag Bmag B magnitude
45- 49 F5.2 mag Jmag 2MASS J magnitude
51- 54 F4.2 mag e_Jmag rms uncertainty on Jmag
56- 60 F5.2 mag Hmag 2MASS H magnitude
62- 65 F4.2 mag e_Hmag rms uncertainty on Hmag
67- 71 F5.2 mag Kmag 2MASS K magnitude
73- 76 F4.2 mag e_Kmag rms uncertainty on Kmag
78- 82 F5.2 mag Amag MSX A magnitude (6.8-10.8um)
84- 87 F4.2 % e_Amag rms percent uncertainty on Amag
89- 92 F4.2 mag Cmag ?=- MSX C magnitude (11.1-13.2um)
94- 98 F5.2 % e_Cmag ?=- rms percent uncertainty on Cmag
100-103 F4.2 mag Dmag ?=- MSX D magnitude (13.5-15.9um)
105-109 F5.2 % e_Dmag ?=- rms percent uncertainty on Dmag
111-115 F5.2 mag Emag ?=- MSX E magnitude (18.2-25.1um)
117-121 F5.2 % e_Emag ?=- rms percent uncertainty on Emag
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential star number
5- 21 A17 --- Gname GLIMPSE identification (Cat. II/293)
23- 31 A9 --- SpT MK spectral type
33 A1 --- l_F24um Limit flag on [24]
34- 38 F5.1 Jy F24um ? IRAC 24um flux
40- 43 F4.2 mag [24] ? IRAC 24um magnitude
45- 48 F4.1 Jy e_F24um ? rms uncertainty on F24um
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Sequential star number
5- 21 A17 --- Gname GLIMPSE/MSX name (GLLL.llll+BB.bbbb)
22 A1 --- n_Gname [abcd] Note on Gname (1)
24- 32 A9 --- SpT MK spectral type
34- 39 I6 --- HD ? HD number
41- 44 F4.2 mag E(K-[8]) K-[8.0] colour excess
46- 50 F5.2 --- Signi Significane of excess, E(K-[8.0])/e_[8.0]
52- 55 I4 pc Dist Spectrophotometric distance
57- 59 I3 pc E_Dist Error on Dist (upper limit)
61- 63 I3 pc e_Dist Error on Dist (lower limit)
65- 68 F4.2 mag AV Visual extinction
70- 73 F4.2 mag E_AV Error on AV (upper limit)
75- 78 F4.2 mag e_AV Error on AV (lower limit)
80- 82 I3 K T ? Best-fit blackbody model temperature for
excess
84- 85 I2 K E_T ? Error on T (upper limit)
87- 88 I2 K e_T ? Error on T (lower limit)
90- 96 F7.5 solLum LIR ? Best-fit infrared luminosity
98-104 F7.5 solLum E_LIR ? Error on LIR (upper limit)
106-112 F7.5 solLum e_LIR ? Error on LIR (lower limit)
114-118 I5 K Teff Effective temperature for the adopted
Kurucz (1993, Kurucz CD-ROM 13) model
120-124 F5.2 [cm/s2] logg Gravity surface for the adopted Kurucz model
126-128 F3.1 arcsec R Radial distance between optical and IR
source positions
130-148 A19 --- Com Comments (2)
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Note (1): Notes as follows:
a = The model fit is marginal and model flux is below [24]
b = There are no data available for λ>8um
c = This MSX star is shown to have a false A-band or [8.0] excess;
see text
d = This star is a known Be star with the excess arising from a
circumstellar shell
Note (2): Comments use the abbreviations::
G = GLIMPSE source
M = MSX source
e = emission-line star
v = variable star
n = star in nebula
m = multiple stars (from SIMBAD database)
o = Oudmaijer et al. (1992A&AS...96..625O 1992A&AS...96..625O) star
p = previous mid-IR spectral work
x = ROSAT X-ray source
c = Clarke et al. (2005, Cat. J/MNRAS/363/1111) star
g = group I designation
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Nomenclature notes:
In table 7, name G295.3770-02.6386 corrected into G295.3770-02.6380,
as in table 4 and MSX catalog.
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Apr-2010