The Ten-Color Photometric System
Basic Reference
Yorka S.B. 1983, AJ 88, 1816
Abstract
A ten-color photometric system for measuring band strengths of NH, CN, CH,
and C2 molecules is described: the system is capable of distinguishing stars
with unusual compositions from normal stars, of quantitatively differentiating
among those stars, and of producing results consistent with spectroscopic
data. Measurements for 26 R, CH, CH-like, and barium stars show that the C2
indices for CH and CH-like stars are similar to those of normal R stars.
These kinds of stars have much stronger C2 indices than normal G-K giants,
whereas the classical barium stars have C2 indices which are only slightly
higher than in normal giants. The NH indices for the classical and marginal
barium stars generally fall within the range of values of NH exhibited by
giants of corresponding temperatures; the NH indices for many of the warm
carbon stars are slightly lower than those for the normal giants. However,
statistical analysis of the NH indices for the entire data set shows no
significant difference between the warm carbon stars and normal giants.
Content
Access to the data and references
Asiago Database on Photometric System (ADPS)
Indices and Parameters
C3366, C3410, C3875, C3908, C4325, C4702, C4766, C5630, C5655
Filters
Filter wavelength Feature Index
[Å]
1 3366 NH(0,0)(1,1) NH
2 3410 Continuum
3 3875 CN(0,0)(1,1) CN
4 3908 Continuum
5 4305 CH G-band CH
6 4325 Continuum
7 4702 C2(1,0)(2,1) C2(+1)
8 4766 Continuum
9 5630 C2(1,0) C2(-1)
10 5655 Continuum
Photomultiplier
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Last update: 21 May 1996