/ftp/cats/v/153



==========================================================================
V/153                       LAMOST DR4 catalogs                    (Luo+, 2018)
The following files can be converted to FITS (extension .fit or fit.gz)
	dr4.dat stellar4.dat astars4.dat mstars4.dat dr4_plan.dat
==========================================================================
Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=V/153
==========================================================================

drwxr-xr-x 146 cats archive 4096 Aug 1 2023 [Up] drwxr-xr-x 3 cats archive 4096 Jan 13 2023 [TAR file] -rw-r--r-- 1 cats archive 506 Dec 19 2022 .message drwxr-xr-x 4 cats archive 144 Sep 13 2018 LAMOST-DR4 -r--r--r-- 1 cats archive 23107 Nov 22 2019 ReadMe -rw-r--r-- 1 cats archive 2709 Nov 22 2019 +footg5.gif -rw-r--r-- 1 cats archive 44895 Nov 22 2019 +footg8.gif -r--r--r-- 1 cats archive 52394053 Sep 4 2018 astars4.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 560269028 Sep 4 2018 dr4.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] drwxr-xr-x 4 cats archive 144 Sep 13 2018 dr4.lamost.org -r--r--r-- 1 cats archive 370327 Sep 4 2018 dr4_plan.dat [txt] [txt.gz] [fits] [fits.gz] [html] -rw-r--r-- 1 cats archive 582121578 Dec 4 2018 listeall0 -r--r--r-- 1 cats archive 71995338 Sep 4 2018 mstars4.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html] -r--r--r-- 1 cats archive 455655696 Sep 4 2018 stellar4.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : V/153 LAMOST DR4 catalogs (Luo+, 2018) ================================================================================ The fourth data release (DR4) of the LAMOST regular survey. Luo A.-L., Zhao Y.-H., Zhao G., et al. <Res. Astron Astrophys., in prep. (2018)> =2018yCat.5153....0L =2018RAA..in.prep..L ================================================================================ ADC_Keywords: Surveys ; Spectroscopy ; Photometry Keywords: techniques: spectroscopic survey - data release - catalog Description: The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) is a Chinese national scientific research facility operated by the National Astronomical Observatories, Chinese Academy of Sciences. It is a special reflecting Schmidt telescope with 4000 fibers in a field of view of 20 deg22in the sky. Until July 2016, LAMOST has completed its pilot survey which was launched in October 2011 and ended in June 2012, and the first four years of regular survey which was initiated on September 2012. After this five-year-survey, we totally obtain 7,617,035 spectra, which consist of stars, galaxies, quasars and other unknown objects. Now, the fourth data release (DR4) has published online (http://dr4.lamost.org/), and released data products include 1. Spectra. - In general, there are 7,617,035 flux- and wavelength-calibrated, sky-subtracted spectra in DR4, including 6,943,865 stars, 117,254 galaxies, 36,575 quasars, and 519,341 unknown objects, and these spectra cover the wavelength range of 3690-9100 angstrom with a resolution of 1800 at the 5500 angstrom. 2. Spectroscopic Parameters Catalogs. - In this data release, six spectroscopic parameters catalogs are also published, they are the LAMOST general catalog, the A, F, G and K type star catalog, the A type star catalog, the M dwarf catalog, the observed plate information catalog, and the input catalog respectively. For the first four catalogs, they all include 36 columns of basic spectroscopic information, for example, right ascension, declination, signal to noise ratio, magnitude, classification and redshift. Also, the A type star catalog publish line indices of six spectral lines and four balmer line widths at 20% below the local continua, the A, F, G and K type star catalog provides effective temperature, surface gravity, and metallicity, and the M dwarf catalog releases the equivalent width of Halpha line, ten line indices, one metallicity sensitive parameter and a flag that indicates whether or not exist magnetic activity. For the observed plate information catalog, it mainly contains nine basic plate information for all published plates. At last, the input catalog includes 24 basic fields mentioned above, and three new fields which are not included in the above catalogs.