The Sinnerstad photometric system
Basic Reference
Sinnerstad U., Arkling J., Alm S.H., Brattlund P. 1968, Ark. Astr. 5, 105
Abstract
The intensities of the absorption lines Hbeta, Hgamma and HeI 4471 have been
determined by means of narrow-band technique. Although this technique is most
important for measures of broad spectral features such as the hydrogen lines
in early type stars, the accuracy of the photoelectrically determined HeI
4471 index is nevertheless comparable with the accuracy achieved in
measurements of equivalent widths from high dispersion spectra. The Be stars
are easily selected from a plot of Hbeta versus Hgamma. A photoelectric method
is finally developed for the determination of the projected rotational
velocity of the stars, V sini.
Content
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
beta, gamma
Filters
Peak
Filter Wavelength Width Line
[Å] [Å]
1 4340 20 Hgamma
2 4340 165 Hgamma
3 4861 20 Hbeta
4 4861 164 Hbeta
Photomultiplier
EMI 6256 S
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Last update: 21 May 1996