Infrared absolute calibration. I. Calibration stars : J/AJ/163/45


Authors : Rieke G.H. orcid , Su K., Sloan G.C. (hide) , Su K., Sloan G.C. et..al

Bibcode : 2022AJ....163...45R (ADS) (Simbad) (Objects) (hide)

CDS Keywords : Stars, standard; Photometry, infrared
UAT : Standard stars, Infrared photometry

Observation (OC)

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Inserted into VizieR : 22-Apr-2022
Last modification : 13-Jun-2022

Infrared Absolute Calibration. I. Comparison of Sirius with Fainter Calibration Stars. (2022)

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 ...(more)
Abstract: (hide)
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.

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