4,654 research outputs found
The promise of recent and future observatories and instruments
The identification of the carrier(s) of diffuse interstellar bands (DIBs) is
one of the oldest mysteries in stellar spectroscopy. With the advent of
8-10m-class telescopes substantial progress has been made in measuring the
properties of DIBs in the optical and near-infrared wavelength domain, not only
in the Galaxy, but also in different environments encountered in Local Group
galaxies and beyond. Still, the DIB carriers have remained unidentified. The
coming decade will witness the development of extremely large telescopes (GMT,
TMT and E-ELT) and their instrumentation. In this overview I will highlight the
current instrumentation plan of these future observatories, emphasizing their
potential role in solving the enigma of the DIBs.Comment: Talk presented at IAU Symposium 297 "The Diffuse Interstellar Bands",
CUP proceedings editors: Jan Cami and Nick Co
On M-functions and their application to input-output models
Models;econometrics
Bifurcating vortex solutions of the complex Ginzburg-Landau equation
It is shown that the complex Ginzburg-Landau (CGL) equation on the real line
admits nontrivial -periodic vortex solutions that have simple zeros
(``vortices'') per period. The vortex solutions bifurcate from the trivial
solution and inherit their zeros from the solution of the linearized equation.
This result rules out the possibility that the vortices are determining nodes
for vortex solutions of the CGL equation.Comment: To appear in Discrete and Continuous Dynamical Systems (1999); 10
pages, 2 figure
The radial velocity curve of HD153919 (4U1700-37) revisited
We have re-analysed all available high-resolution ultraviolet IUE spectra of
the high-mass X-ray binary HD153919/4U1700-37. The radial velocity
semi-amplitude of 20.6 +/- 1.0 km/s and orbital eccentricity of 0.22 +/- 0.04
agree very well with the values obtained earlier from optical spectra. They
disagree with earlier conclusions for the same data reduced by Heap & Corcoran
(1992) and by Stickland & Lloyd (1993).Comment: 6 pages, latex, figure included, Astronomy & Astrophysics, in pres
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