Physics
Scientific paper
Apr 1969
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1969rspta.264..209w&link_type=abstract
Philosophical Transactions for the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 264, Issue 1150
Physics
16
Scientific paper
A multi-band photoelectric photometer for observations in the ultraviolet, blue and visible and the infrared bands W (1\cdot 06 μ m), X (1\cdot 13 μ m), Y (1\cdot 63 μ m) and Z (2\cdot 21 μ m) has been constructed and applied to both stellar and planetary observations. The results of photometry obtained for 61 stars are presented. The observations at λ = 1\cdot 63 μ m 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 the measurement of stellar diameters is proposed based upon the absolute irradiance observed at 2\cdot 21 μ m and the 2\cdot 21 μ m 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.
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