The Tebbe photometric system
Basic Reference
Tebbe P.L. 1969, Astron. J. 74, 920
Abstract
Halpha and Hbeta indices are obtained by interference-filter methods at
Georgetown College Observatory in Washington, D.C. Straight-line
transformations are made to the Crawford and Mander (1966, AJ 72, 114)
standard system. The technique of using alpha and beta indices together,
as described by Abt and Golson (1966, ApJ 143, 306) is used to obtain
a good separation of B-type supergiants from Be stars.
Content
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
alpha, beta
Filters
- Halpha narrow
- Peak wavelength: 6570 Å ; Width : 45 Å
- Halpha wide
- Peak wavelength: 6550 Å ; Width : 157 Å
- Hbeta narrow
- Peak wavelength: 4863 Å ; Width : 39 Å
- Hbeta wide
- Peak wavelength: 4837 Å ; Width : 184 Å
Parameters
- alpha = 2.5 log(Wa) - 2.5 log(Na) + C
- beta = 2.5 log(Wb) - 2.5 log(Nb) + C
Photomultiplier
RCA C-31000 B
Transformations
The beta parameters in the Crawford and Mander (CM) system are computed
from the beta index in the present system with the following relations:
- beta(C-M) = +0.246 + 1.415 beta : for B stars
- beta(C-M) = -0.225 + 1.667 beta : for A-F stars
Please, send your
commentsto epaunzen@physics.muni.cz
epaunzen@physics.muni.cz
Last update: 21 May 1996