2018/05/30 by E. Furlan, D. R. Ciardi, W. D. Cochran +23 · 45 citations
Physics and Astronomy · #Astronomical spectroscopy #Astronomy and Astrophysical Research #Field (mathematics) #Giant star #History and Developments in Astronomy #Kepler #Planet #Spectral line #Spectroscopy #Standard deviation #Stars #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.3847/1538-4357/aaca34
published in The Astrophysical Journal 861(2), 149 (IOP Publishing) · Accepted by ApJ; 43 pages
arxiv created 2018/05/30 · openalex publication_date 2018/07/10 · arxiv updated 2018/08/01 · openalex created_date 2020/01/10 · openalex updated_date 2026/08/06
Abstract We present results from spectroscopic follow-up observations of stars identified in the Kepler field and carried out by teams of the Kepler Follow-up Observation Program. Two samples of stars were observed over 6 yr (2009–2015): 614 standard stars (divided into “platinum” and “gold” categories) selected based on their asteroseismic detections and 2667 host stars of Kepler Objects of Interest (KOIs), most of them planet candidates. Four data analysis pipelines were used to derive stellar parameters for the observed stars. We compare the T eff , log( g ), and [Fe/H] values derived for the same stars by different pipelines; from the average of the standard deviations of the differences in these parameter values, we derive error floors of ∼100 K, 0.2 dex, and 0.1 dex for T eff , log( g ), and [Fe/H], respectively. Noticeable disagreements are seen mostly at the largest and smallest parameter values (e.g., in the giant star regime). Most of the log( g ) values derived from spectra for the platinum stars agree on average within 0.025 dex (but with a spread of 0.1–0.2 dex) with the asteroseismic log( g ) values. Compared to the Kepler Input Catalog (KIC), the spectroscopically derived stellar parameters agree within the uncertainties of the KIC but are more precise and thus an important contribution toward deriving more reliable planetary radii.