Issue |
A&A
Volume 385, Number 3, April III 2002
|
|
---|---|---|
Page(s) | 1107 - 1118 | |
Section | Numerical methods and codes | |
DOI | https://doi.org/10.1051/0004-6361:20020102 | |
Published online | 15 April 2002 |
Transformations between Vilnius and Strömgren photometric systems*
1
Department of Physics & Astronomy, University of Wisconsin Oshkosh, 800 Algoma Blvd., Oshkosh, WI 54901-8644, USA
2
Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark e-mail: indus@astro.ku.dk
Corresponding author: N. Kaltcheva, kaltchev@uwosh.edu
Received:
13
June
2001
Accepted:
17
January
2002
We present a number of relationships
between similar colour indices in the Vilnius and Strömgren
photometric systems, empirically derived from all observational
data available. Significant differences between the corresponding
indices, apparently due to the different central wavelength and
width of the Strömgren u and v bands and Vilnius U and X bands
are found. We demonstrate that the effects may depend on
metallicity and luminosity. For G-K stars of moderate luminosity we
interpret the difference introduced by v and X pass-bands as an
log g effect, reflecting the presence of Ca II lines in these
spectral types. Apart from the interstellar Ca II absorption, the
difference is little affected by the interstellar dust. It
turns out as well to be very straightforward to make an estimation
of the [Fe/H] index with an accuracy of 0.4 dex, using the Vilnius
U and Strömgren u filters. A comparison of
to the
hk index is also presented, supporting the conclusion that X magnitude
is strongly influenced by the Ca II lines. We discuss a possible
influence of the Ca II stellar lines on the absolute magnitude
inferred from the Vilnius photometry.
Key words: methods: observational / techniques: photometric / photometric systems: Strömgren, Vilnius, Strömvil
© ESO, 2002
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