Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1650c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 4, p. 1650-1657.
Astronomy and Astrophysics
Astronomy
203
Calibrating, Infrared Astronomy, Infrared Spectroscopy, Irradiance, Reference Stars, Stellar Spectrophotometry, Broadband, Dwarf Stars, Infrared Astronomy Satellite, Infrared Filters, Isophotes, Narrowband, Stellar Models
Scientific paper
Absolutely calibrated versions of realistic model atmosphere calculations for Sirius and Vega by Kurucz (1991) are presented and used as a basis to offer a new absolute calibration of infrared broad and narrow filters. In-band fluxes for Vega are obtained and defined to be zero magnitude at all wavelengths shortward of 20 microns. Existing infrared photometry is used differentially to establish an absolute scale of the new Sirius model, yielding an angular diameter within 1 sigma of the mean determined interferometrically by Hanbury Brown et al. (1974). The use of Sirius as a primary infrared stellar standard beyond the 20 micron region is suggested. Isophotal wavelengths and monochromatic flux densities for both Vega and Sirius are tabulated.
Barlow Michael J.
Cohen Martin
Deacon John R.
Walker Russell G.
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