The Smith photometric system
Basic Reference
L.F. Smith
Abstract
Results of five-colour narrow band photoelectric observations are given
for forty-three Wolf-Rayet (WR) stars in the Magellanic Clouds and for
seventy-seven WR stars in the Galaxy. Photometric classification criteria
are established and most WR stars in the Magellanic Clouds are classified.
Absolute magnitude are found to be correlated with spectral subclass;
among the WN stars, those in the lowest excitation subclasses are the
most luminous.
It is found tha the WR stars in the Large Magellanic Cloud are very similar
to stars of the same spectral subclass in the Galxy. However, subclass WC6,
WC7, WC8 and WC9 are completely absent from the Magellanic Clouds, and
WN6 stars are rare.
The relationship between absolute magnitude and spectral appearance of the
WC5 + OB stars and the WN4 + OB stars is consistent with the hypothesis
that these are binary systems in which WR stars, similar to single stars
of the same type, are associated with O or B stars.
Content
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
v, b-v, u-b, b-v1, u1-b
Filters
- u1 : Schott
- Central wavelength : 3500 Å ; Width : 80 Å
- u : Schott
- Central wavelength : 3650 Å ; Width : 100 Å
- b : Spectrolab
- Central wavelength : 4270 Å ; Width : 70 Å
- v : Spectrolab
- Central wavelength : 5160 Å ; Width : 130 Å
- v1 : Schott
- Central wavelength : 5500 Å ; Width : 230 Å
Photomultiplier
RCA 1P21
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Last update: 21 May 1996