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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28780
Title: The GALAH survey: accurate radial velocities and library of observed stellar template spectra
Authors: Zwitter, Tomaž
Kos, Janez
Chiavassa, Andrea
Buder, Sven
Traven, Gregor
Čotar, Klemen
Lin, Jane
Asplund, Martin
Bland-Hawthorn, Joss
Casey, Andrew R.
De Silva, Gayandhi
Duong, Ly
Freeman, Kenneth C.
Lind, Karin
Martell, Sarah
D'ORAZI, VALENTINA 
Schlesinger, Katharine J.
Simpson, Jeffrey D.
Sharma, Sanjib
Zucker, Daniel B.
Anguiano, Borja
Casagrande, Luca
Collet, Remo
Horner, Jonathan
Ireland, Michael J.
Kafle, Prajwal R.
Lewis, Geraint
MUNARI, Ulisse 
Nataf, David M.
Ness, Melissa
Nordlander, Thomas
Stello, Dennis
Ting, Yuan-Sen
Tinney, Chris G.
Watson, Fred
Wittenmyer, Rob A.
Žerjal, Maruša
Issue Date: 2018
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 481
Issue: 1
First Page: 645
Abstract: GALAH is a large-scale magnitude-limited southern stellar spectroscopic survey. Its second data release (GALAH DR2) provides values of stellar parameters and abundances of 23 elements for 342 682 stars (Buder et al.). Here we add a description of the public release of radial velocities with a typical accuracy of 0.1 km s<SUP>-1</SUP> for 336 215 of these stars, achievable due to the large wavelength coverage, high resolving power, and good signal-to-noise ratio of the observed spectra, but also because convective motions in stellar atmosphere and gravitational redshift from the star to the observer are taken into account. In the process we derive medians of observed spectra that are nearly noiseless, as they are obtained from between 100 and 1116 observed spectra belonging to the same bin with a width of 50 K in temperature, 0.2 dex in gravity, and 0.1 dex in metallicity. Publicly released 1181 median spectra have a resolving power of 28 000 and trace the well-populated stellar types with metallicities between -0.6 and +0.3. Note that radial velocities from GALAH are an excellent match to the accuracy of velocity components along the sky plane derived by Gaia for the same stars. The level of accuracy achieved here is adequate for studies of dynamics within stellar clusters, associations, and streams in the Galaxy. So it may be relevant for studies of the distribution of dark matter.
URI: http://hdl.handle.net/20.500.12386/28780
URL: https://academic.oup.com/mnras/article-abstract/481/1/645/5078395?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnras/sty2293
Bibcode ADS: 2018MNRAS.481..645Z
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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