The Cester photometric system
Basic Reference
Cester B., Giuricin G., Mardirossian F., Pucillo M., Castelli F., Flora U.
1977, A&AS. 30, 1
Abstract
293 bright stars of spectral types O, B, A, F and of luminosity classes I
through V have been measured with a photoelectric photometer equipped with
two interference filters of 30 Å bandwidth, one centred on Halpha and the
other at lambda 6622. A correction term has been allowed for the response of
the photometric system and for the energy distribution of the continuum at
the two spectral regions considered. The resulting photometric alpha indices
of Halpha line strength are compared with previous Halpha, Hbeta, Hgamma
photometric measures, Halpha equivalent widths, the MK spectral type, [u-b],
[c1] and b-y indices of the photometric system u, v, b, y. The results
emphasize the advantage of using Halpha line photometry to discriminate
between emission line effects and luminosity effects in early-type stars
and to detect emission line variability.
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Last update: 21 May 1996