The ultimate RAVE: final data release published

RAVE observed nearly half a million stars of our Galaxy. The Sun is located at the centre of the coordinate system. The colours represent radial velocities: red are receding stars and stars depicted in blue are approaching. AIP/K. Riebe, the RAVE Collaboration; Milky Way image (background): R. Hurt (SSC); NASA/JPL-Caltech

The RAdial Velocity Experiment RAVE is a spectroscopic survey of stars in the southern hemisphere. RAVE was designed to get a representative census of the movements and of the atmospheric properties of stars in the wider neighbourhood of the Sun.

By means of spectroscopy, the light of a star is decomposed into its rainbow colours. By analysing the spectra, the radial velocity of a star – the movement of the stars in the direction of the observer's view, can be determined.

Furthermore, stellar spectra also enable scientists to determine stellar parameters like temperatures, surface gravities, and composition. In order to trace the structure and shape of our galaxy, RAVE successfully measured 518,387 spectra for 451,783 Milky Way stars.

Astronomers are not only used to think in long time scales – their projects also are often many-year endeavours. RAVE observed the sky for almost every clear night between 2003 and 2013 at the 1.2-metre UK Schmidt telescope of the Anglo-Australian Observatory in Siding Spring, Australia. RAVE utilized a dedicated fibre-optical setup to simultaneously take spectra of up to 150 stars in a single observation.

Only with this massive multiplexing such a large number of targets was achievable – the largest spectroscopic survey before RAVE featured only some 14,000 targets. In this way the survey obtained a representative sample of the stars around our Sun that are located roughly in a volume 15,000 light years across.

Over the past 15 years, an increasing number of stars and refined data products have been released. The final RAVE data release not only provides for the first time the spectra of all stars in the RAVE sample; the stars were also matched with stars from the DR2 catalogue of the satellite mission Gaia.

Thanks to the exquisite distances and proper motions measured by Gaia, considerably improved stellar temperatures, surface gravities and the chemical composition of the stellar atmospheres could be derived.

“The RAVE data releases have provided new insights into the motion of stars and chemical structure of our Milky Way,” says Matthias Steinmetz, leader of the RAVE collaboration and scientific chairman of the Leibniz Institute for Astrophysics Potsdam (AIP).

“The final data release concludes one of the first systematic spectroscopic Galactic Archaeology surveys. It’s really exciting to think about finishing this 15-year project. Thanks to RAVE, we have gained new insights into the structure and composition of our Milky Way. “

Some of the key results of RAVE include the determination of the minimum speed needed for a star to escape the gravitational pull of the Milky Way. The results confirmed that dark matter, an invisible component of the Universe of yet unknown nature, dominates the mass of our Galaxy.

With RAVE it could be shown that the Milky Way disk is asymmetric and wobbles owing to the interaction with spiral arms and the infall of satellite galaxies. RAVE also allowed for the identification of stellar streams in the solar environment. These streams of stars are the residues of torn apart old dwarf galaxies that have merged into our Milky Way in the past.

The chemical element abundances of the observed stars hold important clues to the chemical composition and the subsequent metal enrichment of the interstellar medium traced by stars of different ages and metallicities. With RAVE, astronomers efficiently searched for the very first stars, which are very metal-poor and give clues about the earliest epochs of star formation and the chemical evolution in the Milky Way.

The RAVE collaboration consists of researchers from over 20 institutions around the world and is coordinated by the AIP. More than 100 refereed scientific articles based on RAVE data were published since the first data release.

Prof. Dr. Matthias Steinmetz, 0331 7499 800,

The Sixth Data Release of the Radial Velocity Experiment (RAVE) — I: Survey Description, Spectra and Radial Velocities
Astronomical Journal:
The Sixth Data Release of the Radial Velocity Experiment (RAVE) — II: Stellar Atmospheric Parameters, Chemical Abundances and Distances
Astronomical Journal:

Media Contact

Dr. Janine Fohlmeister idw - Informationsdienst Wissenschaft

More Information:

All latest news from the category: Physics and Astronomy

This area deals with the fundamental laws and building blocks of nature and how they interact, the properties and the behavior of matter, and research into space and time and their structures.

innovations-report provides in-depth reports and articles on subjects such as astrophysics, laser technologies, nuclear, quantum, particle and solid-state physics, nanotechnologies, planetary research and findings (Mars, Venus) and developments related to the Hubble Telescope.

Back to home

Comments (0)

Write a comment

Newest articles

Photonic chip integrates sensing and computing for ultrafast machine vision

Technology eliminates optical-electronic conversions, holds promise for revolutionizing edge intelligence. Researchers have demonstrated a new intelligent photonic sensing-computing chip that can process, transmit and reconstruct images of a scene within…

Pair plasmas found in deep space can now be generated in the lab

An international team of scientists has developed a novel way to experimentally produce plasma ‘fireballs’ on Earth. Black holes and neutron stars are among the densest known objects in the…

New fabric makes urban heat islands more bearable

With applications in clothing, construction and food storage, the new textile reduces heat from both the sun and thermal radiation from nearby buildings. This year has already seen massive heatwaves…

Partners & Sponsors