Bibcode
Rodrigues, T. S.; Girardi, Léo; Miglio, Andrea; Bossini, Diego; Bovy, Jo; Epstein, Courtney; Pinsonneault, Marc H.; Stello, Dennis; Zasowski, Gail; Allende-Prieto, C.; Chaplin, William J.; Hekker, Saskia; Johnson, Jennifer A.; Mészáros, Szabolcs; Mosser, Benoît; Anders, Friedrich; Basu, Sarbani; Beers, Timothy C.; Chiappini, Cristina; da Costa, Luiz A. N.; Elsworth, Yvonne; García, Rafael A.; Pérez, Ana E. García; Hearty, Fred R.; Maia, Marcio A. G.; Majewski, Steven R.; Mathur, Savita; Montalbán, Josefina; Nidever, David L.; Santiago, Basilio; Schultheis, Mathias; Serenelli, Aldo; Shetrone, Matthew
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 445, Issue 3, p.2758-2776
Advertised on:
12
2014
Citations
134
Refereed citations
121
Description
We present a first determination of distances and extinctions for
individual stars in the first release of the APOKASC catalogue, built
from the joint efforts of the Apache Point Observatory Galactic
Evolution Experiment (APOGEE) and the Kepler Asteroseismic Science
Consortium (KASC). Our method takes into account the spectroscopic
constraints derived from the APOGEE Stellar Parameters and Chemical
Abundances Pipeline, together with the asteroseismic parameters from
KASC. These parameters are then employed to estimate intrinsic stellar
properties, including absolute magnitudes, using the Bayesian tool
PARAM. We then find the distance and extinction that best fit the
observed photometry in Sloan Digital Sky Survey (SDSS), 2MASS, and WISE
passbands. The first 1989 giants targetted by APOKASC are found at
typical distances between 0.5 and 5 kpc, with individual uncertainties
of just ˜1.8 per cent. Our extinction estimates are systematically
smaller than provided in the Kepler Input Catalogue and by the Schlegel
et al. maps. Distances to individual stars in the NGC 6791 and NGC 6819
star clusters agree to within their credible intervals. Comparison with
the APOGEE red clump and SAGA catalogues provide another useful check,
exhibiting agreement with our measurements to within a few per cent.
Overall, present methods seem to provide excellent distance and
extinction determinations for the bulk of the APOKASC sample.
Approximately one third of the stars present broad or multiple-peaked
probability density functions and hence increased uncertainties.
Uncertainties are expected to be reduced in future releases of the
catalogue, when a larger fraction of the stars will have seismically
determined evolutionary status classifications.
Related projects
Chemical Abundances in Stars
Stellar spectroscopy allows us to determine the properties and chemical compositions of stars. From this information for stars of different ages in the Milky Way, it is possible to reconstruct the chemical evolution of the Galaxy, as well as the origin of the elements heavier than boron, created mainly in stellar interiors. It is also possible to
Carlos
Allende Prieto