Table information for 'lamost6.ssa_mrs'

General

Table Description: SSA-compliant metadata for LAMOST DR6 medium resolution spectra; this data is also availble through Obscore; the collection name there is LAMOST6 MRS.

This table is available for ADQL queries and through the TAP endpoint.

Resource Description: LAMOST, the The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (or Guoshoujing Telescope) is an instrument tailored for producing large number of optical medium- and low-resolution spectra. Here, we publish both the medium (MRS) and low (LRS) resolution spectra from Data Release 6, http://dr6.lamost.org/v2/, to the Virtual Observatory.

For a list of all services and tables belonging to this table's resource, see Information on resource 'LAMOST DR6 Spectra'

Citing this table

This table has an associated publication. If you use data from it, it may be appropriate to reference http://dr6.lamost.org/v2/ either in addition to or instead of the service reference.

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:lamost6_ssa_mrs,
  year=2020,
  title={{LAMOST} DR6 Spectra},
  author={National Astronomical Observatories of the Chinese Academy of Sciences},
  url={http://dc.zah.uni-heidelberg.de/tableinfo/lamost6.ssa_mrs},
  howpublished={{VO} resource provided by the {GAVO} Data Center}
}

Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope LAMOST) is a National Major Scientific Project built by the Chinese Academy of Sciences. Funding for the project has been provided by the National Development and Reform Commission. LAMOST is operated and managed by the National Astronomical Observatories, Chinese Academy of Sciences.

Please also see the LAMOST Data Policy.

Columns

Sorted by DB column index. [Sort alphabetically]

NameTable Head DescriptionUnitUCD
accref Product key Access key for the data N/A meta.ref.url;meta.dataset
owner Owner Owner of the data N/A N/A
embargo Embargo ends Date the data will become/became public yr N/A
mime Type MIME type of the file served N/A meta.code.mime
accsize File size Size of the data in bytes byte N/A
ssa_dstitle Title A compact and descriptive designation of the dataset. N/A meta.title;meta.dataset
ssa_creatorDID C. DID Dataset identifier assigned by the creator N/A meta.id
ssa_pubDID P. DID Dataset identifier assigned by the publisher N/A meta.ref.ivoid
ssa_cdate Proc. Date Processing/Creation date N/A time;meta.dataset
ssa_pdate Pub. Date Date last published. N/A N/A
ssa_bandpass Bandpass Bandpass (i.e., rough spectral location) of this dataset; this should be the most appropriate term from the vocabulary http://www.ivoa.net/rdf/messenger. N/A instr.bandpass
ssa_cversion C. Version Creator assigned version for this dataset (will be incremented when this particular item is changed). N/A meta.version;meta.dataset
ssa_targname Object Common name of object observed. N/A meta.id;src
ssa_targclass Ob. cls Object class (star, QSO,...; use Simbad object classification http://simbad.u-strasbg.fr/simbad/sim-display?data=otypes if at all possible) N/A src.class
ssa_redshift z Redshift of target object N/A src.redshift
ssa_targetpos Obj. pos Equatorial (ICRS) position of the target object. N/A pos.eq;src
ssa_snr SNR Median signal to noise ratio over all pixel, computed as flux/sqrt(variance) N/A stat.snr
ssa_location Location ICRS location of aperture center deg pos.eq
ssa_aperture Aperture Angular diameter of aperture deg phys.angSize;instr.fov
ssa_dateObs Date Obs. Midpoint of exposure (MJD) d time.epoch
ssa_timeExt Exp. Time Exposure duration s time.duration
ssa_specmid Mid. Band Midpoint of region covered in this dataset m instr.bandpass
ssa_specext Bandwidth Width of the spectrum m instr.bandwidth
ssa_specstart Band start Lower value of spectral coordinate m em.wl;stat.min
ssa_specend Band end Upper value of spectral coordinate m em.wl;stat.max
ssa_length Length Number of points in the spectrum N/A N/A
ssa_model Model Data model name and version N/A N/A
ssa_csysName Sys System RA and Dec are given in N/A N/A
ssa_timeSI [Time] Time conversion factor in Osuna-Salgado convention. N/A N/A
ssa_spectralSI [Spectral] Spectral conversion factor in Osuna-Salgado convention N/A N/A
ssa_spectralucd UCD(spectral) UCD of the spectral column in the spectra served; when you have wavelengths, use em.wl for vacuum wavelengths, em.wl;obs.atmos for air wavelengths. N/A meta.ucd
ssa_spectralunit unit(spectral) Unit of the spectral column N/A meta.unit
ssa_fluxSI [Flux] Flux/magnitude conversion factor in Osuna-Salgado convention N/A N/A
ssa_fluxucd UCD(flux) UCD of the flux column N/A meta.ucd
ssa_fluxunit unit(flux) Unit of the flux column N/A meta.unit
ssa_dstype Data type Type of data (spectrum, time series, etc) N/A N/A
ssa_publisher Publisher Publisher of the datasets included here. N/A meta.curation
ssa_creator Creator Creator of the datasets included here. N/A N/A
ssa_collection Collection A short handle naming the collection this spectrum belongs to. N/A N/A
ssa_instrument Instrument Instrument or code used to produce these datasets N/A meta.id;instr
ssa_datasource Src Method of generation for the data (one of survey, pointed, theory, custom, artificial). N/A N/A
ssa_creationtype Using Process used to produce the data (archival, cutout, filtered, mosaic, projection, spectralExtraction, or catalogExtraction) N/A N/A
ssa_reference Ref. URL or bibcode of a publication describing this data. N/A meta.bib.bibcode
ssa_fluxStatError Err. flux Statistical error in flux N/A stat.error;phot.flux.density;em
ssa_fluxSysError Sys. Err flux Systematic error in flux N/A stat.error.sys;phot.flux.density;em
ssa_fluxcalib Calib Flux Type of flux calibration (ABSOLUTE, CALIBRATED, RELATIVE, NORMALIZED, or UNCALIBRATED). N/A N/A
ssa_binSize Spect. Bin Bin size in wavelength m em.wl;spect.binSize
ssa_spectStatError Err. Spect Statistical error in wavelength m stat.error;em
ssa_spectSysError Sys. Err. Spect Systematic error in wavelength m stat.error.sys;em
ssa_speccalib Calib. Spect. Type of wavelength calibration N/A meta.code.qual
ssa_specres Spec. Res. Resolution (in meters of wavelength) on the spectral axis m spect.resolution;em.wl
ssa_spaceError Err. Spc Statistical error in position deg stat.error;pos.eq
ssa_spaceCalib Calib. Spc Type of calibration in spatial coordinates N/A meta.code.qual
ssa_spaceRes Res. Spc Spatial resolution of data deg pos.angResolution
mobsid Mobsid Unique identifier for the medium resolution spectrum (most of these have multiple observations and include a coadded spectrum). N/A meta.id;meta.main
ssa_region Coverage Rough coverage based on location and aperture. N/A pos.outline;obs.field
obsid Obsid Unique identifier for the observation; LAMOST observations typically result in multiple spectra. N/A meta.id;obs
designation Target Target Designation (IAU style) N/A meta.id
planid Plan Identifier of the observation plan N/A meta.id;obs.proposal
spid SG id Identifier of the Spectragraph that took the source spectrum. N/A meta.id;instr
fiberid Fiber Identifier of the fiber used to take the source spectrum N/A meta.id;instr
ra_obs Fiber RA ICRS right ascension of the fiber pointing (can be different from ra for bright sources). deg pos.eq.ra
dec_obs Fiber Dec ICRS declination of the fiber pointing deg pos.eq.dec
objtype Ob. type Object type: star, k2star, fs, rvcandi, gal N/A meta.code.class
magtype Mag.Type Designation of the bands of the magnitudes in mag_arr; this is not easy to parse by a machine, sorry. N/A meta.code
mag_arr Mags. An array of derived magnitudes. See mag_types for the bands these magnitudes are intended for. N/A phot.mag
fibertype Fiber Fiber Type of target (one of Obj, Sky, F-std, Unused, PosErr, Dead) N/A meta.code;instr
target_comment Comment Various comments (e.g., an external target id). N/A meta.note
offset_v Offset Offset of the observation from the target coordinate (these are added for bright objects to prevent saturation). arcsec instr.offset
ra Target RA ICRS right ascension for this object from input catalogue deg pos.eq.ra;meta.main
dec Target Dec ICRS declination for this object from input catalogue deg pos.eq.dec;meta.main
rv_b0 RV b0 Radial velocity estimated from the B spectrum after continuum removal. km/s spect.dopplerVeloc
rv_b0_err Err. RV b0 Error in rv_b0. km/s stat.error;spect.dopplerVeloc
rv_r0 RV r0 Radial velocity estimated from the R spectrum after continuum removal. km/s spect.dopplerVeloc
rv_r0_err Err. RV r0 Error in rv_r0. km/s stat.error;spect.dopplerVeloc
rv_br0 RV br0 Radial velocity estimated from the B and R spectra after continuum removal. km/s spect.dopplerVeloc
rv_br0_err Err. RV br0 Error in rv_br0. km/s stat.error;spect.dopplerVeloc
rv_lasp0 RV lasp0 Radial velocity estimated from the LAMOST stellar parameter pipeline. km/s spect.dopplerVeloc
rv_lasp0_err Err. RV lasp0 Error in rv_lasp0. km/s stat.error;spect.dopplerVeloc
rv_b1 RV b1 rv_b0 after zero-point correction km/s spect.dopplerVeloc
rv_b1_err Err. RV b1 Error in rv_b1. km/s stat.error;spect.dopplerVeloc
rv_r1 RV r1 rv_r0 after zero-point correction km/s spect.dopplerVeloc
rv_r1_err Err. RV r1 Error in rv_r1. km/s stat.error;spect.dopplerVeloc
rv_br1 RV br1 rv_br0 after zero-point correction km/s spect.dopplerVeloc
rv_br1_err Err. RV br1 Error in rv_br1. km/s stat.error;spect.dopplerVeloc
rv_lasp1 RV lasp1 rv_lasp0 after zero-point correction km/s spect.dopplerVeloc
rv_lasp1_err Err. RV lasp1 Error in rv_lasp1. km/s stat.error;spect.dopplerVeloc
rv_b_flag b ? Flag for RV extraction in the b band: 0 – no anomalies; 1 – too many bad pixels; 2 – radial velocity in excess of 450 km/s; 3 – low similarity with best-matched template. N/A meta.code.qual
rv_r_flag r ? Flag for RV extraction in the r band: 0 – no anomalies; 1 – too many bad pixels; 2 – radial velocity in excess of 450 km/s; 3 – low similarity with best-matched template. N/A meta.code.qual
rv_br_flag br ? Flag for RV extraction in the br band: 0 – no anomalies; 1 – too many bad pixels; 2 – radial velocity in excess of 450 km/s; 3 – low similarity with best-matched template. N/A meta.code.qual
coadd Coadd? 1 if this is a co-added spectrum N/A meta.code
fibermask Fiber prob Bitmask for fiber problems. See note for the meaning for the bits. [Note fib] N/A meta.code.qual
bad_b B bad? 1 if this is a problematic B spectrum. N/A meta.code
bad_r R bad? 1 if this is a problematic R spectrum. N/A meta.code

Columns that are parts of indices are marked like this.

Other

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VOResource

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