Paper Abstracts on photometry
Buser R. (1978, A&A 62, 411)
Abstract
In the context of a systematic investigation of multicolor photometric
systems, the UBV, RGU and uvby systems have been evaluated. Detailed
spectral energy distributions for stars of various spectral types and
luminosity classes have been used along with the response functions of the
systems, to compute synthetic colors. A standard law of interstellar
extinction has been applied to obtain the reddening parameters for the
UBV and RGU systems.
The response function of the U-passband of the UBV system has been revised
in order to reduce the non-linearities existing in the transformation of
the synthetic U-B colors to the mean observational system. For the broad-band
systems, the results are in good agreement with observations. For the uvby
system the agreement is less good, indicating that higher resolution of
the energy distributions will be necessary to synthesize the colors
for this sytem.
Smith G.H. (1986, PASP 98, 231)
Abstract
Washington CMT1T2 photometry has been obtained for a sample of field red giants
for which DDO colors are also available from the literature. Washington
line-blanketing indices D(M-T1) and D(C-M) have been derived, and are found
to correlate very well, suggesting that they are both useful indicators of
overall metal abundance [A/H]. Both parameters also correlate quite well
with the DDO metallicity index dcm. Any [N/A] or [C/A] abundance variations
which may exist among the present sample of old disk giants do not appear
to significantly affect the D(C-m) index.
epaunzen@physics.muni.cz
Last update: 7 Novembre 1995