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Bayesian distances and extinctions for giants observed by Kepler and APOGEE

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Bayesian distances and extinctions for giants observed by Kepler and APOGEE

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Título Bayesian distances and extinctions for giants observed by Kepler and APOGEE
Autor Rodrigues, Thaise da Silva
Girardi, Leo Alberto
Miglio, Andrea
Bossini, Diego
Bovy, Jo
Epstein, Courtney
Pinsonneault, Marc H.
Zasowski, G.
Allende Prieto, Carlos
Chaplin, William James
Hekker, Saskia
Johnson, J.A.
Mészáros, S.
Mosser, Benoît
Anders, Friedrich
Basu, Sarbani
Beers, T.C.
Chiappini, C.C.M.
Costa, Luiz N. da
Elsworth, Yvonne P.
Garcia, Rafael A.
García Pérez, Ana Elia
Maia, Marcio Antonio Geimba
Majewski, Steven Raymond
Mathur, Savita
Montalbán, Josefina
Nidever, D.L.
Santiago, Basilio Xavier
Schultheis, Mathias
Serenelli, Aldo M.
Shetrone, M.
Abstract 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.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 445, no. 3 (Dec. 2014), p. 2758-2776
Assunto Aglomerados estelares
Catalogos astronomicos
Estrelas gigantes
Evolucao estelar
[en] Stars: distances
[en] Stars: fundamental parameters
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/115331
Arquivos Descrição Formato
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