Bibcode
Serenelli, A.; Johnson, Jennifer; Huber, Daniel; Pinsonneault, Marc; Ball, Warrick H.; Tayar, Jamie; Silva Aguirre, Victor; Basu, Sarbani; Troup, Nicholas; Hekker, Saskia; Kallinger, Thomas; Stello, Dennis; Davies, Guy R.; Lund, Mikkel N.; Mathur, Savita; Mosser, Benoit; Stassun, Keivan G.; Chaplin, William J.; Elsworth, Yvonne; García, Rafael A.; Handberg, Rasmus; Holtzman, Jon; Hearty, Fred; García-Hernández, D. A.; Gaulme, Patrick; Zamora, O.
Bibliographical reference
The Astrophysical Journal Supplement Series, Volume 233, Issue 2, article id. 23, 32 pp. (2017).
Advertised on:
12
2017
Citations
116
Refereed citations
105
Description
We present the first APOKASC catalog of spectroscopic and asteroseismic
data for dwarfs and subgiants. Asteroseismic data for our sample of 415
objects have been obtained by the Kepler mission in short (58.5 s)
cadence, and light curves span from 30 up to more than 1000 days. The
spectroscopic parameters are based on spectra taken as part of the
Apache Point Observatory Galactic Evolution Experiment and correspond to
Data Release 13 of the Sloan Digital Sky Survey. We analyze our data
using two independent {T}{eff} scales, the spectroscopic
values from DR13 and those derived from SDSS griz photometry. We use the
differences in our results arising from these choices as a test of
systematic temperature uncertainties and find that they can lead to
significant differences in the derived stellar properties.
Determinations of surface gravity ({log}g), mean density (<ρ
> ), radius (R), mass (M), and age (τ) for the whole sample have
been carried out by means of (stellar) grid-based modeling. We have
thoroughly assessed random and systematic error sources in the
spectroscopic and asteroseismic data, as well as in the grid-based
modeling determination of the stellar quantities provided in the
catalog. We provide stellar properties determined for each of the two
{T}{eff} scales. The median combined (random and systematic)
uncertainties are 2% (0.01 dex; {log}g), 3.4% (<ρ > ), 2.6%
(R), 5.1% (M), and 19% (τ) for the photometric {T}{eff}
scale and 2% ({log}g), 3.5% (<ρ > ), 2.7% (R), 6.3% (M), and
23% (τ) for the spectroscopic scale. We present comparisons with
stellar quantities in the asteroseismic catalog by Chaplin et al. that
highlight the importance of having metallicity measurements for
determining stellar parameters accurately. Finally, we compare our
results with those coming from a variety of sources, including stellar
radii determined from TGAS parallaxes and asteroseismic analyses based
on individual frequencies. We find a very good agreement for all
inferred quantities. The latter comparison, in particular, gives strong
support to the determination of stellar quantities based on global
seismology, a relevant result for future missions such as TESS and
PLATO.
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Nucleosynthesis and molecular processes in the late stages of Stellar Evolution
Low- to intermediate-mass (M < 8 solar masses, Ms) stars represent the majority of stars in the Cosmos. They finish their lives on the Asymptotic Giant Branch (AGB) - just before they form planetary nebulae (PNe) - where they experience complex nucleosynthetic and molecular processes. AGB stars are important contributors to the enrichment of the
Domingo Aníbal
García Hernández