Accession Number : AD0669566

Title :   NEAR INFRARED PHOTOMETRY OF LATE TYPE STARS.

Descriptive Note : Environmental research papers no. 281,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Walker,Russell G.

Report Date : FEB 1968

Pagination or Media Count : 33

Abstract : A multi-band photoelectric photometer for making observations in the U, B, V, and infrared bands W(1.06 microns) X(1.13 microns), Y(1.63 microns) and Z(2.21 microns) was constructed and applied to both stellar and planetary observations. The results of photometry obtained for 61 stars are presented. The observations at lambda = 1.63 microns are shown to exhibit an excess flux due to a minimum in the H opacity in accordance with the predictions of model atmosphere studies. Bolometric corrections are derived for stars of late spectral type from integration of the observed absolute spectral irradiance curve. A simple photometric method for measuring stellar diameters is proposed based upon the absolute irradiance observed at 2.21 microns and the 2.21 microns flux at the surface of the star calculated from model atmospheres. Angular diameters derived by this technique are consistent with interferometric results and, when combined with the bolometric corrections, effective temperatures are found. (Author)

Descriptors :   (*STARS, INFRARED RADIATION), INFRARED SPECTROPHOTOMETERS, BAND SPECTRA, PREDICTIONS, INFRARED SPECTRA, CORRECTIONS, ATMOSPHERE MODELS, INTENSITY, COLORS, PERIODIC VARIATIONS, TELESCOPES, BLACKBODY RADIATION, TEMPERATURE, ERRORS, CALIBRATION, MATHEMATICAL ANALYSIS, ULTRAVIOLET SPECTRA, VISIBLE SPECTRA, TABLES(DATA)

Subject Categories : Astronomy

Distribution Statement : APPROVED FOR PUBLIC RELEASE