J/AJ/165/99 Absolute Calibration. III. Sirius & Sun IR spectra (Rieke+, 2023)
Absolute Calibration.
III. Improved Absolute Calibration for the Visible through the Mid-infrared.
Rieke G.H., Engelke C., Su K., Casagrande L.
<Astron. J., 165, 99 (2023)>
=2023AJ....165...99R 2023AJ....165...99R
ADC_Keywords: Sun; Stars, standard; Spectra, optical; Spectra, infrared
Keywords: Infrared photometry ; Calibration
Abstract:
We propose Sirius as an improved zero-point-defining star and
calibrate its spectrum to an accuracy of ∼0.6% in both the visible and
infrared. This result is based on a newly derived independent
calibration in the visible of similar accuracy to the previous
standard one, with which it is combined. We use a large variety of
approaches in the infrared to reach about three times smaller error
than for previous absolute calibrations. The results in the two
wavelength regimes are in agreement, providing a consistent link from
the visible throughout the near- and mid-infrared. The Sirius-based
zero-point at 5557.5Å (in vacuum) is
13.436±0.081x10-12W/cm2/µm, based on the improved value for
Vega of 3.473±0.018x10-12W/cm2/µm and the measured
magnitude difference between the two stars. At 2.1603µm, the
zero-point is 4.225±0.025x10-14W/cm2/µm taking Sirius at a
magnitude of -1.395. A jackknife analysis indicates that there are no
serious systematic errors in these results. We consider selection of
secondary standards that can extend the calibration over the sky.
Despite more than a century in this role, normal A-stars are not
suitable, although Am and Ap stars may be. G-stars older than ∼1Gyr
are good candidates if accurate temperatures can be measured. White
dwarfs are suitable from the visible through the near-infrared, but
their properties are unexplored at the necessary level at the longer
infrared wavelengths, and for most facilities they are too faint
there. Finally, as a further test of the calibration, we demonstrate
an upgraded infrared flux method to determine accurate stellar
diameters from K-band photometry.
Description:
For wavelengths shorter than 2.7µm, we have used the results from
Coddington+, 2021GeoRL..4891709C. From 2.7-3.6µm, we have used the
spectrum from Gueymard, 2006AdSpR..37..323G 2006AdSpR..37..323G. At 3.6µm, we switch to
the spectrum from Rieke+, 2008, J/AJ/135/2245.
Objects:
-------------------------------------------
RA (2000) DE Designation(s)
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06 45 08.91 -16 42 58.0 Sirius = * 9 CMa
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table17.dat 27 6673 Calibrated spectrum of Sirius
table18.dat 27 30735 Calibrated spectrum of the Sun
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See also:
II/5 : UBV Photometry of Bright Stars (Johnson+ 1966)
J/ApJS/99/135 : Rotation and Spectral Peculiarities (Abt+ 1995)
J/AJ/110/275 : IR spectra of standard stars (Cohen+ 1995)
J/AJ/112/2274 : Spectral irradiance calibration. VII. (Cohen+ 1996)
J/A+AS/119/547 : IR photometry of ESO calibration stars (van der Bliek+ 1996)
J/A+AS/131/209 : JHK(L') photometry of giant stars (Alonso+ 1998)
J/AJ/126/2048 : NStars project; the Northern Sample. I. (Gray+, 2003)
J/AJ/125/3311 : JHKL'M photometry of northern bright stars (Kidger+, 2003)
J/A+A/411/559 : Effective temperature for 181 F-K dwarfs (Kovtyukh+, 2003)
J/ApJS/150/343 : ISOCAM CVF 2.2-16.5µm spectra (Engelke+, 2004)
J/ApJS/154/673 : COBE DIRBE Point Source Catalog (Smith+, 2004)
J/ApJ/626/446 : Effective temperature scale of FGK stars (Ramirez+, 2005)
J/AJ/132/1445 : Standard calibration stars infrared spectra (Engelke+, 2006)
J/MNRAS/373/781 : JHK photometry of faint standard stars (Leggett+, 2006)
J/A+A/450/735 : Effective temperatures and radii of stars (Masana+, 2006)
J/PASP/119/994 : MIPS 24um calibrators (Engelbracht+, 2007)
J/AJ/133/2464 : Parameters and abundances of nearby giants (Luck+, 2007)
J/A+A/463/671 : Rotational velocities of A-type stars. III. (Royer+, 2007)
J/AJ/135/2245 : Absolute spectrum of Sun & Vega for 0.2-30um (Rieke+, 2008)
J/A+A/487/373 : Spectroscopic parameters 451 HARPS-GTO stars (Sousa+, 2008)
J/AJ/140/1919 : Zero point spectral energy distribution (Engelke+, 2010)
J/ApJS/190/203 : 3.6 years of DIRBE NIR stellar light curves (Price+, 2010)
J/PASP/124/140 : UBVRI Hp BT and VT photonic responses (Bessell+, 2012)
J/ApJ/746/101 : Diameters and temperatures of AFG stars (Boyajian+, 2012)
J/ApJ/761/16 : IR colors of Sun from Line-Depth Ratios (Casagrande+, 2012)
J/ApJ/771/40 : Main-sequence A, F, G, and K stars photo. (Boyajian+, 2013)
J/ApJ/768/25 : Spitzer & Herschel observations debris disks (Gaspar+, 2013)
J/A+A/553/A95 : PCA approach stellar effective temperatures (Bermejo+, 2013)
J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)
J/ApJS/211/25 : Spitzer/IRS debris disk catalog. I. (Chen+, 2014)
J/AJ/149/11 : Spectra of candidate standard stars in mid-IR (Sloan+, 2015)
J/A+A/597/A137 : HD123999 and AlphaCen A and B OIFITS files (Kervella+, 2017)
J/AJ/155/30 : Fundamental parameters of 87 stars from NPOI (Baines+, 2018)
J/MNRAS/489/1753 : Masses and radii of Kepler and CoRoT targets (Yildiz+, 2019)
J/AJ/162/198 : Fundamental parameters of 44 stars with NPOI (Baines+, 2021)
J/AJ/161/177 : Spitzer IRAC photo. 36 JWST calibration stars (Krick+, 2021)
J/ApJS/254/11 : The Spitzer Kepler Survey (SpiKeS) catalog (Werner+, 2021)
J/A+A/658/A47 : Dwarf stars limb-darkening coefficients (Karovicova+, 2022)
J/AJ/163/45 : IR absolute calibration. I. Calibration stars (Rieke+, 2022)
Byte-by-byte Description of file: table1[78].dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 um Wave Wavelength
10- 18 E9.3 W/cm2/um Flux Flux density
20- 27 E8.3 W/cm2/um e_Flux ? Uncertainty in Flux
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History:
From electronic version of the journal
References:
Rieke et al. Paper I: 2022AJ....163...45R 2022AJ....163...45R Cat. J/AJ/163/45
(End) Prepared by [AAS], Coralie Fix [CDS], 02-Jun-2023