J/AJ/163/45 Infrared absolute calibration. I. Calibration stars (Rieke+, 2022)
Infrared Absolute Calibration.
I. Comparison of Sirius with Fainter Calibration Stars.
Rieke G.H., Su K., Sloan G.C., Schlawin E.
<Astron. J., 163, 45 (2022)>
=2022AJ....163...45R 2022AJ....163...45R
ADC_Keywords: Stars, standard; Photometry, infrared
Keywords: Fundamental parameters of stars
Abstract:
A challenge in absolute calibration is to relate very bright stars
with physical flux measurements to faint ones within range of modern
instruments, e.g., those on large ground-based telescopes or the James
Webb Space Telescope (JWST). We propose Sirius as the fiducial color
standard. It is an A0V star that is slowly rotating and does not have
infrared excesses due to either hot dust or a planetary debris disk;
it also has a number of accurate (∼1%-2%) absolute flux measurements.
We accurately transfer the near-infrared flux from Sirius to
BD+601753, an unobscured early A-type star (A1V, V∼9.6, E(B-V)∼0.009)
that is faint enough to serve as a primary absolute flux calibrator
for JWST. Its near-infrared spectral energy distribution and that of
Sirius should be virtually identical. We have determined its output
relative to that of Sirius in a number of different ways, all of which
give consistent results within ∼1%. We also transfer the calibration
to GSPC P330-E, a well-calibrated close solar analog (G2V). We have
emphasized the 2MASS Ks band, since it represents a large number and
long history of measurements, but the theoretical spectra (i.e., from
CALSPEC) of these stars can be used to extend this result throughout
the near- and mid-infrared.
Description:
To determine the intrinsic color difference between Ks and IRAC Band
1, we used the observations obtained in Spitzer PID70076. We focus on
Band 1 to avoid the effects of the strong CO absorption in Band 2 for
stars later than mid-F type. The data were processed by the Spitzer
Science Center (SSC) with the final IRAC pipeline. We used the basic
calibrated data (BCD) images, which have a native scale of
1.22"/pixel.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table10.dat 62 89 Transformed photometry
table11.dat 22 1288 Photometry in IRAC band 1
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
II/365 : CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2020)
J/ApJ/761/16 : IR colors of the Sun from Line-Depth Ratios (Casagrande+, 2012)
J/MNRAS/427/343 : Infrared excesses of Hipparcos stars (McDonald+, 2012)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/MNRAS/440/3430 : SDSS-2MASS-WISE stellar colour locus (Davenport+, 2014)
J/AJ/149/11 : Spectra of candidate standard stars in mid-IR (Sloan+, 2015)
J/AJ/161/177 : Spitzer IRAC photometry 36 JWST calibration stars (Krick+, 2021)
Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Stellar identifier
10- 14 F5.3 mag Vmag [2.89/6.89] Apparent V band Vega magnitude
16- 21 F6.3 Jy Flux [1.02/17.2] Spitzer/IRAC 3.6um flux density
23- 27 F5.3 mag Jmag [2.96/6.19] 2MASS J-band magnitude
29- 33 F5.3 mag Hmag [0/6.17]? 2MASS H-band magnitude
35- 39 F5.3 mag Ksmag [3.02/6.14] 2MASS Ks-band magnitude
41- 50 A10 --- Ref Reference codes (1)
52- 56 F5.3 mag 3.6mag [3.01/6.09] Spitzer/IRAC 3.6um magnitude (2)
58- 62 F5.3 --- KsmagT [3.02/6.14] Transformed Ks magnitude based only
on heritage photometry (3)
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Note (1): References as follows:
1 = 2MASS, Cutri+, 2003, II/246
2 = Su & Rieke, unpublished
3 = Allen & Cragg, 1983MNRAS.203..777A 1983MNRAS.203..777A
4 = Bouchet+, 1991A&AS...91..409B 1991A&AS...91..409B
5 = Alonso+, 1998, J/A+AS/131/209
6 = Kidger & Martin-Luis, 2003, J/AJ/125/3311
7 = Aumann & Probst, 1991AJ....368..264A 1991AJ....368..264A
8 = Carter+, 1990MNRAS.242....1A 1990MNRAS.242....1A
9 = Glass+, 1974MNSSA..33...71G 1974MNSSA..33...71G
10 = McGregor+, 1994PASP..106..508M 1994PASP..106..508M
11 = Johnson+, 1966, II/5
12 = Groote & Kaufmann, 1983A&AS...53...91G 1983A&AS...53...91G
Note (2): Zero point taken to be 276.5Jy to force zero color for V-Ks=0.
Note (3): The JHK magnitudes in the previous columns include 2MASS photometry
as well as the transformed heritage photometry whenever unsaturated
2MASS photometry is available.
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Stellar identifier
11- 16 F6.3 Jy Flux [0.16/18.7] Spitzer/IRAC 3.6micron band flux density
18- 22 F5.3 Jy e_Flux [0.003/0.7] Uncertainty in Flux
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 08-Apr-2022