SPECTRAL PROPERTIES OF COOL STARS: EXTENDED ABUNDANCE ANALYSIS OF 1,617 PLANET-SEARCH STARS
By J. Brewer, Debra A. Fischer, J. Valenti, N. Piskunov. 2016
279 citations recorded by the source corpus.
We present a catalog of uniformly determined stellar properties and abundances for 1,617 F, G, and K stars using an automated spectral synthesis modeling procedure. All stars were observed using the HIRES spectrograph at Keck Observatory. Our procedure used a single line list to fit model spectra to observations of all stars to determine effective temperature, surface gravity, metallicity, projected rotational velocity, and the abundances of 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, and Y). Sixty percent of the sample had Hipparcos parallaxes and V-band photometry, which we combined with the spectroscopic results to obtain mass, radius, and luminosity. Additionally, we used the luminosity, effective temperature, metallicity and α-element enhancement to interpolate in the Yonsei–Yale isochrones to derive mass, radius, gravity, and age ranges for those stars. Finally, we determined new relations between effective temperature and macroturbulence for dwarfs and subgiants. Our analysis achieved precisions of 25 K in , 0.01 dex in [M/H], 0.028 dex for , and 0.5 km s−1 in based on multiple observations of the same stars. The abundance results were similarly precise, between ∼0.01 and ∼0.04 dex, though trends with respect to remained for which we derived empirical corrections. The trends, though small, were much larger than our uncertainties and are shared with published abundances. We show that changing our model atmosphere grid accounts for most of the trend in [M/H] between 5000 and 5500 K, indicating a possible problem with the atmosphere models or opacities.
Subfields: Astronomy and Astrophysics, Education, Instrumentation
View Paper: https://www.semanticscholar.org/paper/d8b2d16b0a6449fada88af8d515348701df6c81a
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Citations in the corpus
- The California-Kepler Survey. VII. Precise Planet Radii Leveraging Gaia DR2 Reveal the Stellar Mass Dependence of the Planet Radius Gap (2018, unknown): “We note that offsets of ≈100K are often observed when comparing different spectroscopic catalogs as well as when comparing spectroscopic temperatures to temperatures determined by other techniques, such as the infrared flux method or interferometry (Brewer et al. 2016).”
- HD 209458b in new light: evidence of nitrogen chemistry, patchy clouds and sub-solar water (2017, background): “They reported a water abundance of ∼0.01- 0.05× the prediction for a solar abundance atmosphere (∼ 5×10−3), despite a super-solar stellar metallicity of [O/H] = 0.092 ± 0.036 (Brewer et al. 2016).”
- The Revised TESS Input Catalog and Candidate Target List (2019, background): “Table 1 Spectroscopic Catalogs in the TIC Name Data Release Approximate No. of Stars Priority References SPOCS L 1.6 k 1 Brewer et al. (2016) PASTEL L 93 k 2 Soubiran et al. (2016) Gaia-ESO DR3 29 k 3 Gilmore et al. (2012) TESS-HERMES DR1 25 k 4 Sharma et al. (2018) GALAH DR2 340 k 5 Buder et al.…”
- Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library (2017, methodology): “Brewer et al. 2016 Brewer et al. (2016) conducted a detailed spectroscopic analysis of 1617 dwarf and subgiant stars with Teff = 4700–6800 K observed by Keck/HIRES.”
- How to Constrain Your M Dwarf. II. The Mass–Luminosity–Metallicity Relation from 0.075 to 0.70 Solar Masses (2018, background): “These [Fe/H] measurements are not necessarily on the same scale as those from Mann et al. (2013a), which are calibrated against abundances of Sun-like stars from Brewer et al. (2015, 2016).”