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Masses and Ages for 230,000 LAMOST Giants, via Their Carbon and Nitrogen Abundances
Anna Y. Q. Ho, Hans-Walter Rix, Melissa K. Ness +3
We measure carbon and nitrogen abundances to 0.1 dex for 450,000 giant stars from their low-resolution (R1800) LAMOST DR2 survey spectra. We use these [C/M] and [N…
The Cannon 2: A data-driven model of stellar spectra for detailed chemical abundance analyses
Andrew R. Casey, David W. Hogg, Melissa Ness +3
We have shown that data-driven models are effective for inferring physical attributes of stars (labels; Teff, logg, [M/H]) from spectra, even when the signal-to-noise ratio is low.…
Label Transfer from APOGEE to LAMOST: Precise Stellar Parameters for 450,000 LAMOST Giants
Anna Y. Q. Ho, Melissa K. Ness, David W. Hogg +6
In this era of large-scale stellar spectroscopic surveys, measurements of stellar attributes ("labels," i.e. parameters and abundances) must be made precise and consistent across s…
Chemical tagging can work: Identification of stellar phase-space structures purely by chemical-abundance similarity
David W. Hogg, Andrew R. Casey, Melissa Ness +10
Chemical tagging promises to use detailed abundance measurements to identify spatially separated stars that were in fact born together (in the same molecular cloud), long ago. This…