Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as...99..499k&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 99, no. 3, p. 499-511.
Astronomy and Astrophysics
Astrophysics
2
Electrophotometers, F Stars, G Stars, Stellar Spectrophotometry, Radial Velocity, Spectral Line Width, Stellar Color, Stellar Magnitude
Scientific paper
Observations of a sample of 118 stars at the south galactic pole are presented. Diagrams of instrumental vs standard beta values for the standard stars may indicate that the transformation must be divided into two regions with slightly different slopes A and intercepts B. The narrow bandpass of the filter set employed has an FWHM of 27 A and is centered at 4860 A. A radial velocity of 100 km/s will reduce the beta-index of a sharp beta line with 0.005-0.010 m relative to a zero velocity star. It is argued that the two transformations are a result of slightly different bandwidths of the narrow-band filters used for the original measurements of the present secondary standards and in the present observing run. The present narrow band's FWHM is smaller by 3 A.
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