18,447 research outputs found
Sub-normal Solutions to Painleve's Second Differential Equation
In a recent paper, Aimo Hinkkanen and Ilpo Laine proved that the
transcendental solutions to Painleve's second differential equation w"=a+zw+w^3
have either order of growth 3 or else 3/2. We complete this result by proving
that there exist no sub-normal solutions (order of growth 3/2) other than the
so-called Airy solutions
RAVE as a Gaia precursor: what to expect from the Gaia RVS?
The Radial Velocity Experiment (RAVE) is a large wide-field spectroscopic
stellar survey of the Milky Way. Over the period 2003-2013, 574,630 spectra for
483,330 stars have been amassed at a resolution of R=7500 in the Ca-triplet
region of 8410-8795\AA. Wavelength coverage and resolution are thus comparable
to that anticipated from the Gaia RVS. Derived data products of RAVE include
radial velocities, stellar parameters, chemicals abundances for Mg, Al, Si, Ca,
Ti, Fe, and Ni, and absorption measures based on the diffuse interstellar bands
(DIB) at 8620\AA. Since more than 290000 RAVE targets are drawn from the
Tycho-2 catalogue, RAVE will be an interesting prototype for the anticipated
full Gaia data releases, in particular when combined with the early Gaia data
releases, which contain astrometry but not yet stellar parameters and
abundances.Comment: 7 pages, 3 color figures. Invited contribution to the GREAT-ITN
conference "The Milky Way Unravelled by Gaia: GREAT Science from the Gaia
Data Releases", 1-5 December 2014, University of Barcelona, Spain, EAS
Publications Series, eds Nicholas Walton, Francesca Figueras, and Caroline
Soubira
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