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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey

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Autor(es):
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Grieves, N. [1] ; Ge, J. [1] ; Thomas, N. [2] ; Willis, K. [1] ; Ma, B. [1] ; Lorenzo-Oliveira, D. [3, 4] ; Queiroz, A. B. A. [5, 3] ; Ghezzi, L. [6] ; Chiappini, C. [3, 7] ; Anders, F. [3, 7] ; Dutra-Ferreira, L. [5, 3] ; Porto de Mello, G. F. [3, 8] ; Santiago, B. X. [5, 3] ; da Costa, L. N. [6, 3] ; Ogando, R. L. C. [6, 3] ; del Peloso, E. F. [3] ; Tan, J. C. [1, 9] ; Schneider, D. P. [10, 11] ; Pepper, J. [12] ; Stassun, K. G. [13] ; Zhao, B. [1] ; Bizyaev, D. [14, 15, 16] ; Pan, K. [15, 16]
Número total de Autores: 23
Afiliação do(s) autor(es):
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[1] Univ Florida, Dept Astron, Gainesville, FL 32611 - USA
[2] US Air Force Acad, Dept Astronaut Engn, Colorado Springs, CO 80840 - USA
[3] LIneA, Rua Gereral Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[4] Univ Sao Paulo, Dept Astron, IAG, Rua Matao 1226, BR-05508900 Sao Paulo, SP - Brazil
[5] Univ Fed Rio Grande do Sul, Inst Fis, Caixa Postal 15051, BR-91501970 Porto Alegre, RS - Brazil
[6] Observ Nacl, Rua Gen Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ - Brazil
[7] Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam - Germany
[8] Univ Fed Rio de Janeiro, Observ Valongo, Ladeira do Pedro Antonio 43, BR-20080090 Rio De Janeiro, RJ - Brazil
[9] Univ Virginia, Dept Astron, Charlottesville, VA 22904 - USA
[10] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 - USA
[11] Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802 - USA
[12] Lehigh Univ, Dept Phys, 16 Mem Dr East, Bethlehem, PA 18015 - USA
[13] Vanderbilt Univ, Dept Phys & Astron, 6301 Stevenson Ctr Ln, Nashville, TN 37235 - USA
[14] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992 - Russia
[15] Apache Point Observ, POB 59, Sunspot, NM 88349 - USA
[16] New Mexico State Univ, POB 59, Sunspot, NM 88349 - USA
Número total de Afiliações: 16
Tipo de documento: Artigo Científico
Fonte: Monthly Notices of the Royal Astronomical Society; v. 481, n. 3, p. 3244-3265, DEC 2018.
Citações Web of Science: 1
Resumo

Combining stellar atmospheric parameters, such as effective temperature, surface gravity, and metallicity, with barycentric radial velocity data provides insight into the chemo-dynamics of the Milky Way and our local Galactic environment. We analyse 3075 stars with spectroscopic data from the Sloan Digital Sky Survey III MARVELS radial velocity survey and present atmospheric parameters for 2343 dwarf stars using the spectral indices method, a modified version of the equivalent width method. We present barycentric radial velocities for a sample of 2610 stars with a median uncertainty of 0.3 kms(-1). We determine stellar ages using two independent methods and calculate ages for 2335 stars with a maximum-likelihood isochronal age-dating method and for 2194 stars with a Bayesian age-dating method. Using previously published parallax data, we compute Galactic orbits and space velocities for 2504 stars to explore stellar populations based on kinematic and age parameters. This study combines good ages and exquisite velocities to explore local chemo-kinematics of the Milky Way, which complements many of the recent studies of giant stars with the APOGEE survey, and we find our results to be in agreement with current chemo-dynamical models of the Milky Way. Particularly, we find from our metallicity distributions and velocity-age relations of a kinematically defined thin disc that the metal-rich end has stars of all ages, even after we clean the sample of highly eccentric stars, suggesting that radial migration plays a key role in the metallicity scatter of the thin disc. All stellar parameters and kinematic data derived in this work are catalogued and published online in machine-readable form. (AU)

Processo FAPESP: 16/20667-8 - Cronômetros estelares: a conexão entre idade, atividade cromosférica, rotação e abundâncias de lítio em estrelas de tipo solar
Beneficiário:Diego Lorenzo de Oliveira
Linha de fomento: Bolsas no Brasil - Pós-Doutorado