Parts I and III of the sixth fundamental catalog, a catalog of
high-precision astrometry for bright stars combining centuries of
ground-based observations as reflected in FK5 with HIPPARCOS
astrometry.
The result contains, in particular for the proper motions,
statistically significant improvements of the Hipparcos data und
represents a system of unprecedented accuracy for these 4150
fundamental stars. The typical mean error in pm is 0.35 mas/year for
878 basic stars, and 0.59 mas/year for the sample of the 3272
additional stars.
Parts I and III of the sixth fundamental catalog, a catalog of
high-precision astrometry for bright stars combining centuries of
ground-based observations as reflected in FK5 with HIPPARCOS
astrometry.
The result contains, in particular for the proper motions,
statistically significant improvements of the Hipparcos data und
represents a system of unprecedented accuracy for these 4150
fundamental stars. The typical mean error in pm is 0.35 mas/year for
878 basic stars, and 0.59 mas/year for the sample of the 3272
additional stars.
The Earth rotates around its polar axis and orbits around the Sun:
the sky above us (the celestial sphere) is in constant apparent
motion. Stellarium is the perfect tool to demonstrate the motions of
the sky, the use of coordinates and to illustrate constellations.
Stars have different colors and luminosities. Following this tutorial
we will learn what star luminosity and color are, and which
information about stellar evolution we can obtain from them.
TIRO calculates bound-bound and bound-free absorption cross-sections
and respective model atoms based on Kurucz's data
(http://kurucz.harvard.edu/atoms.html).
TMAW -- Tübingen Model Atmosphere Package WWW Interface
Short Name:
TMAW
Date:
23 Mar 2022 13:13:07
Publisher:
The GAVO DC team
Description:
The Tübingen NLTE Model-Atmosphere Package (`TMAP
<http://astro.uni-tuebingen.de/%7ETMAP/TMAP.html>`_) is a tool to calculate
stellar atmospheres in spherical or plane-parallel geometry in hydrostatic
and radiative equilibrium allowing departures from local thermodynamic
equilibrium (LTE) for the population of atomic levels./TMAP/ is based on
the so-called Accelerated Lambda Iteration (ALI) method and is able to
account for line blanketing by metals. All elements from hydrogen to nickel
may be included in the calculation with model atoms which are tailored for
the aims of the user.
This tutorial will show how tabular data can be easily transferred
from Topcat to Aladin or the other way, and it will illustrate the
benefits of this inter-client communication for VO users. This is
shown with a quick look at filtering members of the Coma Cluster from
SDSS.