/ftp/cats/III/284



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III/284                APOGEE-2 data from DR16                (Majewski+, 2017)
The following files can be converted to FITS (extension .fit or fit.gz)
	allstars.dat allvis.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=III/284
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drwxr-xr-x 259 cats archive 8192 Dec 5 19:00 [Up] drwxr-xr-x 4 cats archive 4096 Mar 14 10:38 [TAR file] -rw-r--r-- 1 cats archive 474 Dec 19 2022 .message -r--r--r-- 1 cats archive 58423 Dec 4 2021 ReadMe -rw-r--r-- 1 cats archive 3406 Nov 19 2021 +footg5.gif -rw-r--r-- 1 cats archive 40786 Nov 19 2021 +footg8.gif -rw-r--r-- 1 cats archive 1463040 Oct 11 2019 allPlates-r12-l33.fits -rw-r--r-- 1 cats archive 664759787 Oct 12 2019 allStar-r12-l33.fits.gz [Uncompressed] -rw-r--r-- 1 cats archive 246204259 Oct 11 2019 allVisit-r12-l33.fits.gz [Uncompressed] -r--r--r-- 1 cats archive 1547811 May 31 2021 allplate.dat [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 310020703 Sep 24 2020 allstars.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 249841473 Oct 13 2020 allvis.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 3188 Sep 29 2020 flags_Ap2T1.htx -r--r--r-- 1 cats archive 2113 Sep 29 2020 flags_Ap2T2.htx -r--r--r-- 1 cats archive 2318 Sep 29 2020 flags_Ap2T3.htx -r--r--r-- 1 cats archive 2935 Sep 29 2020 flags_ApT1.htx -r--r--r-- 1 cats archive 2264 Sep 29 2020 flags_ApT2.htx -r--r--r-- 1 cats archive 2994 Sep 29 2020 flags_ascap.htx -r--r--r-- 1 cats archive 803 Aug 6 2020 flags_extratarg.htx -r--r--r-- 1 cats archive 1822 Oct 19 2020 flags_paramflag.htx -r--r--r-- 1 cats archive 2139 Sep 29 2020 flags_star.htx -r--r--r-- 1 cats archive 1247324 May 31 2021 table3.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : III/284 APOGEE-2 data from DR16 (Johnsson+, 2020) ================================================================================ APOGEE data and spectral analysis from SDSS Data Release 16: seven years of observations including first results from APOGEE-South. Jonsson H., Holtzman J.A., Allende Prieto C., Cunha K., Garcia-Hernandez D.A., Hasselquist S., Masseron T., Osorio Y., Shetrone M., Smith V., Stringfellow G.S., Bizyaev D., Edvardsson B., Majewski S.R., Meszaros S., Souto D., Zamora O., Beaton R.L., Bovy Jo, Donor J., Pinsonneault M.H., Poovelil V.J., Sobeck J. <Astron. J., 160, 120 (2020)> =2020AJ....160..120J =2017AJ....154...94M (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Spectra, infrared; Surveys Keywords: Galactic abundances ; Galaxy radial velocities ; Stellar abundances ; Near infrared astronomy ; High resolution spectroscopy Abstract: The spectral analysis and data products in Data Release 16 (DR16; 2019 December) from the high-resolution near-infrared Apache Point Observatory Galactic Evolution Experiment (APOGEE)-2/Sloan Digital Sky Survey (SDSS)-IV survey are described. Compared to the previous APOGEE data release (DR14; 2017 July), APOGEE DR16 includes about 200000 new stellar spectra, of which 100000 are from a new southern APOGEE instrument mounted on the 2.5m du Pont telescope at Las Campanas Observatory in Chile. DR16 includes all data taken up to 2018 August, including data released in previous data releases. All of the data have been re-reduced and re-analyzed using the latest pipelines, resulting in a total of 473307 spectra of 437445 stars. Changes to the analysis methods for this release include, but are not limited to, the use of MARCS model atmospheres for calculation of the entire main grid of synthetic spectra used in the analysis, a new method for filling "holes" in the grids due to unconverged model atmospheres, and a new scheme for continuum normalization. Abundances of the neutron-capture element Ce are included for the first time. A new scheme for estimating uncertainties of the derived quantities using stars with multiple observations has been applied, and calibrated values of surface gravities for dwarf stars are now supplied. Compared to DR14, the radial velocities derived for this release more closely match those in the Gaia DR2 database, and a clear improvement in the spectral analysis of the coolest giants can be seen. Description: The Apache Point Observatory Galactic Evolution Experiment (APOGEE; Majewski+ 2017AJ....154...94M) was originally an infrared stellar spectroscopic survey within Sloan Digital Sky Survey (SDSS)-III (henceforth APOGEE-1; Eisenstein+ 2011AJ....142...72E), and APOGEE-2 is the continuation of the same program within SDSS-IV (Blanton+ 2017AJ....154...28B). APOGEE-2 DR16 (2019 December) maps the dynamical and chemical patterns of Milky Way stars with data from the 1-meter NMSU Telescope and the 2.5-meter Sloan Foundation Telescope at the Apache Point Observatory in New Mexico (APOGEE-2N), and the 2.5-meter du Pont Telescope at Las Campanas Observatory in Chile (APOGEE-2S).