Within this use case you meet representatives of the most interesting
categories of celestial objects. From stellar clusters to galaxies.
All objects are from the Messier catalog that includes some of the
most viewed objects of the deep sky.
Within this case you discover the geometry of the orbit of the Moon
and the nature of its phases. As special case of the circumstances of
Moon's orbit, the use case introduces the eclipses, both of Moon and
Sun.
TheoSSA provides spectral energy distributions based on model
atmosphere calculations. Currently, we serve results obtained using
the Tübingen NLTE Model Atmosphere Package (TMAP) for hot compact
stars.
TheoSSA provides spectral energy distributions based on model
atmosphere calculations. Currently, we serve results obtained using
the Tübingen NLTE Model Atmosphere Package (TMAP) for hot compact
stars.
The Panchromatic High-Resolution Spectroscopic Survey of Local Group
Star Clusters PCSLG
Short Name:
PCSLG SSAP
Date:
23 Mar 2022 13:13:17
Publisher:
The GAVO DC team
Description:
This dataset contains spectroscopic observations of 29 globular
clusters in the Magellanic Clouds and the Milky Way performed with
VLT/X-shooter over eight full nights.
A catalogue of 541 nearby (within 10pc of the sun) stars, brown
dwarfs, and confirmed exoplanets in 336 systems, as well 21
candidates, compiled from SIMBAD and several other sources. Where
available, astrometry and photometry from Gaia eDR3 has been inserted.
Within this use case you recognize a physical association of stars
close in space as opposed to a superpositon created by projection
effects of stars very far one from the others. The key measure is
distance derived from parallax. With the true members of the
association (open cluster) you create a Herzsprung-Russell diagram as
in the tutorial “the stars” (ivo://edu.gavo.org/eurovo/aida_stars).
The Herzsprung-Russell diagram of stellar clusters is very important
because of the low noise of few unrelated stars.
If used in the classroom this advanced use case requires a reasonable
understanding of histograms and bidimensional scatter diagrams. It is
also rather long to perform from beginning to end.
PPMXL is a catalog of positions, proper motions, 2MASS- and optical
photometry of 900 million stars and galaxies, aiming to be complete
down to about V=20 full-sky. It is the result
of a re-reduction of USNO-B1 together with 2MASS to the ICRS as
represented by PPMX. This service additionally provides improved proper
motions computed according to Vickers et al, 2016
(:bibcode:`2016AJ....151...99V`).
Within this use case you discover the shapes of galaxies and their
classification according to the Hubble diagram. You are offered
sequences of galaxies with different morphologies and are asked to
order them. The morphological classification of galaxies is still in
use even if we have discovered that the Hubble diagram "per se" has no
direct physical or evolutionary meaning. Besides introducing the main
shapes of galaxies, the use case offer a demonstration of the
classification process, a fundamental tool of astronomers.