The ubvr photometric system
Basic Reference
Westerlund B.E. 1966, ApJ 145, 724
Abstract
Thirty-five objects listed by Roberts as Wolf-Rayet stars have been observed
photoelectrically in a narrow-band four-color system. The system is calibrated
through observations of six spectrophotometric standard stars. Comparisons
with the UBV system are presented. Criteria for separating single w-R stars
from binaries as well as WC stars from WN stars are investigated. The distances
of the W-R stars in Cygnus are discussed briefly.
Content
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
v, v-r, b-v, u-b
Reddening-free parameters
- Delta = (u-b) - 0.68 (b-v)
- delta = (b-v) - 1.43 (v-r)
Filters
Narrow-band interference filters from Baird Atomic
Effective
Filter wavelength Width
[Å] [Å]
r 5990 80
y 5190 100
b 4280 65
u 3650 100
Photomultiplier
RCA 1P21
Please, send your
commentsto epaunzen@physics.muni.cz
epaunzen@physics.muni.cz
Last update: 21 May 1996