The Landolt photometric system

Basic Reference

Landolt A.U. 1970, Astron. J. 75, 337

Abstract

Narrow-band photoelectric indices were defined at the NIII triplet (lambda 4634, 4640, 4641) and at HeII 4686 for 156 O and Of stars. There is some slight indication that the indices defined are sensitive to luminosity. If true, the VI Cygni association is much nearer than previously thought. Comments are made concerning variability of these spectral features.

Content

Access to the data and references

Asiago Database on Photometric System (ADPS)

Indices and Parameters

n, h

Filters

n narrow:
Lam_eff : 4628 Å ; Width : 47.0 Å
n broad:
Lam_eff : 4637 Å ; Width : 178.5 Å
h narrow:
Lam_eff : 4687 Å ; Width : 41.6 Å
h broad:
Lam_eff : 4679 Å ; Width : 191.1 Å

Photomultiplier

RCA 1P21
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Jean-Claude.Mermilliod@obs.unige.ch
Last update: 21 May 1996