Cited by 109Stellar, planetary, and galactic studiesAstronomy and Astrophysical ResearchGalaxies: Formation, Evolution, Phenomena

Photometric Separation of Stellar Properties Using SDSS Filters

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Lenz, Dawn D., Newberg, Heidi Jo, Rosner, Robert, Richards, Gordon T., Stoughton, Chris·1998·The Astrophysical Journal Supplement Series

Abstract

Using synthetic photometry of Kurucz model spectra, we explore the colors of stars as a function of temperature, metallicity, and surface gravity with Sloan Digital Sky Survey (SDSS) filters, u ' g ' r ' i ' z '. The synthetic colors show qualitative agreement with the few published observations in these filters. We find that the locus of synthetic stars is basically two-dimensional for 4500 < T < 8000 K, which precludes simultaneous color separation of the three basic stellar characteristics we consider. Colors including u ' contain the most information about normal stellar properties; measurements in this filter are also important for selecting white dwarfs. We identify two different subsets of the locus in which the loci separate by either metallicity or surface gravity. For 0.5 < g ' - r ' < 0.8 (corresponding roughly to G stars), the locus separates by metallicity; for photometric error of a few percent, we estimate metallicity to within ~0.5 dex in this range. In the range -0.15 < g ' - r ' < 0.00 (corresponding roughly to A stars), the locus shows separation by surface gravity. In both cases, we show that it is advantageous to use more than two colors when determining stellar properties by color. Strategic observations in SDSS filters are required to resolve the source of a ~5% discrepancy between synthetic colors of Gunn-Stryker stars, Kurucz models, and external determinations of the metallicities and surface gravities. The synthetic star colors can be used to investigate the properties of any normal star and to construct analytic expressions for the photometric prediction of stellar properties in special cases.

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  • The LSST filter complement (ugrizy) is modeled after the SDSS system because of its demonstrated success in photometric redshifts of galaxies, separation of stellar populations, and photometric selection of quasars.

    “The LSST fi lter complement ( ugrizy ; see Figure 4 ) is modeled after the SDSS system ( Fukugita et al. 1996 ) because of its demonstrated success in a wide variety of applications, including photometric redshifts of galaxies ( Budavári et al. 2003 ) , separation of stellar populations ( Lenz et al. 1998; Helmi et al. 2003 ) , and photometric selection of quasars ( Richards et al. 2002; Ross et”

    From LSST: From Science Drivers to Reference Design and Anticipated Data Products (2019) · cites this paper as Lenz et al. 1998

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Research works printed but not linked: 1

  1. J. E., & Knapp, G. R. 1993, in ASP Conf. Proc. 43, Sky Surveys :

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Authors
Lenz, D. D., Newberg, H. J., Rosner, R., Richards, G. T., & Stoughton, C.
Affiliations
  • University of Chicago (US)
  • Fermi National Accelerator Laboratory (US)
Venue
The Astrophysical Journal Supplement Series
Published
1998-12-01
Volume
119
Issue
2
Pages
121-140
ISSN
  • 0067-0049 (ISSN-L)
  • 1538-4365
OpenAlex
W1998823839
Cited by
109
References
13
Citations by year
2026: 2 · 2025: 4 · 2024: 2 · 2023: 1 · 2022: 3 · 2021: 1 · 2020: 1 · 2019: 7 · 2018: 6 · 2017: 1 · 2016: 7 · 2015: 4 · 2014: 5 · 2013: 4 · 2012: 5
FWCI
2.99
Type
journal article
Language
en
Open access
Locations
The Astrophysical Journal Supplement Series (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
Keywords
stellar colors, synthetic photometry, metallicity, surface gravity, effective temperature, color-color relations, white dwarfs, stellar parameter estimation

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