The First Data Release of LAMOST Low Resolution Single Epoch Spectra
LAMOST Data Release 5, covering ∼17,000 sq. deg from −10 to 80 deg in declination, contains 9 millions co-added low resolution spectra of celestial objects, each spectrum combined from repeat exposure of two to tens of times during Oct 2011 to Jun 2017. In this data release, the spectra of individual exposures for all the objects in LAMOST Data Release 5 are presented. For each spectrum, equivalent width of 60 lines from 11 different elements are calculated with a new method combining the actual line core and fitted line wings. For stars earlier than F type, the Balmer lines are fitted with both emission and absorption profiles once two components are detected. Radial velocity of each individual exposure is measured by minimizing χ2 between the spectrum and its best template. Database for equivalent widths of spectral lines and radial velocities of individual spectra are available online. For stars observed in the same day and with signal-to-noise ratio higher than 20, the radial velocity uncertainty is below 5km/s, and increase to 10km/s for stars observed in different nights.
· Data access ·
LAMOST , LSR , spectrum , single-epoch
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National Astronomical Data Center