Interstellar calcium and sodium absorption in MaStar is modeled and removed, yielding corrected spectra and simple stellar population templates that reduce a systematic bias in galaxy stellar population analyses.
"Not too old" metal deficient stellar populations: the case of metallicity Z=0.00001
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abstract
We investigate the evolution of metal deficient stellar structures, presenting H-burning isochrones covering cluster ages from 800 Myr to 7 Gyr. Evolutionary evidences for selection effects in the metallicity distribution of very metal poor H-burning red giants are reported. The evolution of stars during central and shell He burning is further investigated, discussing the occurrence of He burning pulsators as a function of cluster age.
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SDSS-IV MaStar: Quantification and Abatement of Interstellar Absorption in the Largest Empirical Stellar Spectral Library
Interstellar calcium and sodium absorption in MaStar is modeled and removed, yielding corrected spectra and simple stellar population templates that reduce a systematic bias in galaxy stellar population analyses.