SDSS-IV MaStar: A Large and Comprehensive Empirical Stellar Spectral Library—First Release

  • Yan R
  • Chen Y
  • Lazarz D
  • et al.
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Abstract

We present the first release of the MaNGA Stellar Library (MaStar), which is a large, well-calibrated, high-quality empirical library covering the wavelength range 3622–10354 Å at a resolving power of R  ∼ 1800. The spectra were obtained using the same instrument as used by the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) project, by piggybacking on the Sloan Digital Sky Survey (SDSS-IV)/Apache Point Observatory Galaxy Evolution Experiment 2-N (APOGEE-2N) observations. Compared to previous empirical libraries, the MaStar library will have a higher number of stars and a more comprehensive stellar-parameter coverage, especially of cool dwarfs, low-metallicity stars, and stars with different [ α /Fe], achieved by a sophisticated target-selection strategy that takes advantage of stellar-parameter catalogs from the literature. This empirical library will provide a new basis for stellar-population synthesis and is particularly well suited for stellar-population analysis of MaNGA galaxies. The first version of the library contains 8646 high-quality per-visit spectra for 3321 unique stars. Compared to photometry, the relative flux calibration of the library is accurate to 3.9% in g  −  r , 2.7% in r  −  i , and 2.2% in i  −  z . The data are released as part of SDSS Data Release 15. We expect the final release of the library to contain more than 10,000 stars.

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APA

Yan, R., Chen, Y., Lazarz, D., Bizyaev, D., Maraston, C., Stringfellow, G. S., … Zhao, Y.-H. (2019). SDSS-IV MaStar: A Large and Comprehensive Empirical Stellar Spectral Library—First Release. The Astrophysical Journal, 883(2), 175. https://doi.org/10.3847/1538-4357/ab3ebc

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