The Abt-Golson photometric system
Basic Reference
Abt H.A., Golson J.C. 1966, ApJ 143, 306
Abstract
Among the early-type stars found in objective-prism surveys to have Halpha
in emission, the majority are dwarf Be stars but about 10 per cent are
normal Ia supergiants, whose absolute magnitudes are about Mv = -7. This
paper describes a search for an efficient method of separating these two
groups. It is found that, with photoelectric measures using narrow-band
filters centered on Halpha and Hbeta, it is possible to separate from a
mixed sample about two-thirds of the Be stars and two-thirds of the
supergiants.
Content
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
alpha, beta, gamma, delta
Filters
Peak
Filter Kitt Peak No wavelength Width
[Å] [Å]
Halpha : 71 6567 54
210 6595 159
Hbeta : 216 4868 26
225 4880 210
Hgamma : 48 4340 31
49 4385 161
Hdelta : 200 4115 64
199 4115 130
Photomultiplier
RCA 1P21 or EMI 9558
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epaunzen@physics.muni.cz
Last update: 21 May 1996