The Landolt photometric system
Landolt A.U. 1970, Astron. J. 75, 337
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.
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
- 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
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Last update: 21 May 1996