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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Jean-Claude.Mermilliod@obs.unige.ch
Last update: 21 May 1996