J/ApJ/653/675 Spitzer 24µm photometry of A dwarfs (Su+, 2006)
Debris disk evolution around A stars.
Su K.Y.L., Rieke G.H., Stansberry J.A., Bryden G., Stapelfeldt K.R.,
Trilling D.E., Muzerolle J., Beichman C.A., Moro-Martin A., Hines D.C.,
Werner M.W.
<Astrophys. J., 653, 675-689 (2006)>
=2006ApJ...653..675S 2006ApJ...653..675S
ADC_Keywords: Stars, dwarfs ; Stars, A-type ; Photometry, infrared
Keywords: circumstellar matter - infrared: stars - planetary systems: formation
Abstract:
We report 24 and/or 70um measurements of ∼160 A-type main-sequence
stars using the Multiband Imaging Photometer for Spitzer (MIPS).
Description:
The majority (128) of the stars in this study are from the Spitzer
Guaranteed Time Observation (GTO) programs (ASTAR, FAB4, and DIRTY12),
for which most were selected because they had known ages based on
cluster membership or association with moving groups. An additional 32
stars are included from the Spitzer calibration observations. In
total, our sample includes 160 stars ranging in spectral type from B6
to A7, but mostly (∼85%) from B9 to A7.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 158 160 Sample of stars and MIPS measurements
table2.dat 65 19 Information on the additional IRAS stars
refs.dat 42 23 References
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See also:
J/ApJ/620/1010 : Spitzer 24µm photometry of A dwarfs (Rieke+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Source name
10 A1 --- n_Name [de] Note: d = Herbig Ae/Be star, x = Be star
12- 44 A33 --- AOR The Spitzer observation AOR key(s)
45- 52 A8 --- SpType MK spectral type
54- 58 F5.1 pc Dist Distance
60- 70 A11 --- Loc The Cluster/Moving Group source locate in
72- 74 I3 Myr Age Source age (2)
76 A1 --- n_Age [f] Young star (2)
78- 85 A8 --- r_Age Reference(s) on Age, in refs.dat file
87- 93 F7.2 mJy F24 ? Spitzer/MIPS 24 micron flux density
95-100 F6.2 mJy e_F24 ? Uncertainty in F24um
102-107 F6.2 --- S/N24 ? Signal-to-noise ratio of F24um
109-115 F7.3 --- R24 ? The 24 micron Excess Ratio (4)
117-119 A3 --- IRE24 Infrared excess at 24 microns? (5)
121 A1 --- n_IRE24 [s] star disregarded having 24um excess due
to low excess significance (χ24<3)
123 A1 --- l_F70 The 3σ limit flag on F70um
124-131 F8.2 mJy F70 ? Spitzer/MIPS 70 micron flux density
133-139 F7.2 mJy e_F70 ? Uncertainty in F70um
141-146 F6.2 --- S/N70 ? Signal-to-noise ratio of F70um
148-154 F7.3 --- R70 ? The 70 micron Excess Ratio (4)
156-158 A3 --- IRE70 Infrared excess at 70 microns? (5)
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Note (2): Age is set to 0 for the young stars that are below the ZAMS
on the Herzsprung-Russel diagram
Note (4): Ratio of measured flux density to expected photospheric flux density.
Note (5): IR excess is classified using the 3-σ criteria excess
higher than 1.06 at 24um and 1.55 at 70um:
YES = having an infrared excess
NO = being detected but with no excess above the 3σ confidence level
UPL = having only an upper limit.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Name
10- 13 F4.2 mag Ksmag 2MASS Ks magnitude
15- 17 I3 Myr Age Age (1)
19- 24 A6 --- SpType MK spectral type
27- 31 F5.3 Jy F25 Flux at 25um
33- 37 F5.3 --- R25 Ratio between measured flux and predicted flux
based on Ks-[24]color at 25um
39- 43 F5.3 Jy F60 Flux at 60um
45- 49 F5.2 --- R60 Ratio between measured flux and predicted flux
based on Ks-[24]color at 60um
51- 54 F4.2 --- e_R60 rms uncertainty on R60um
56- 59 F4.2 --- chi60 Significance of excess emission at 60um, i.e.
(R60um-1)/e_R60um
61- 65 F5.2 --- U60 2σ upper limit on R60um, i.e.,
R60+2e_R60um
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Note (1): Reference for age used can be found in Rieke et al.
(2005, Cat. J/ApJ/620/1010).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 42 A19 --- Aut Author's name
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 31-Jul-2008