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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.)

Exploring the Origin of Moving Groups and Diagonal Ridges by Simulations of Stellar Orbits and Birthplaces

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Autor(es):
Barros, Douglas A. [1] ; Perez-Villegas, Angeles [2] ; Lepine, Jacques R. D. [2] ; Michtchenko, Tatiana A. [2] ; Vieira, Ronaldo S. S. [3, 4]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Rua Sessenta & Tres 125, BR-53090393 Olinda, Pernambuco - Brazil
[2] Univ Sao Paulo, IAG, Rua Matao 1226, BR-05508090 Sao Paulo, SP - Brazil
[3] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210580 Santo Andre, SP - Brazil
[4] Univ Estadual Campinas, Dept Appl Math, BR-13083859 Campinas, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: ASTROPHYSICAL JOURNAL; v. 888, n. 2 JAN 10 2020.
Citações Web of Science: 0
Resumo

The present paper is the culmination of a series aimed at contributing to the understanding of the kinematic structures of the solar neighborhood (SN), explaining the origin of the Local Arm, and relating the moving groups with the spiral-arms resonances in the disk. With a model for the Galactic potential, with the Sun inside the spiral corotation resonance (CR), we integrate the 2D orbits of test particles distributed in birthplaces along the main spiral arms, the Local Arm, and in the axisymmetric disk. A comparison of the resulting U-V plane of the SN with that provided by Gaia DR2 confirms our previous conclusion that the moving groups of Coma Berenices, Pleiades, and Hyades are associated with the CR, and that the Hercules stream is formed by the bulk of high-order inner Lindblad resonances. The kinematic structures result from stellar orbits trapped by the spiral resonances in a timespan of similar to 1 Gyr, indicating the long-lived nature of the spiral structure and challenging recent arguments in favor of short-lived structures originated from incomplete phase mixing in the Galactic disk. As a byproduct, our simulations give some insight into the birthplaces of the stars presently located in the SN; the majority of stars of the main moving groups and the Hercules stream were likely born in the Local Arm, while stars of the Sirius group possibly originated from the outer segment of the Sagittarius-Carina arm. We also propose the spiral resonances as the dynamical origin for the diagonal ridges in the Galactic distribution of rotation velocities. (AU)

Processo FAPESP: 17/15893-1 - Órbitas de aglomerados globulares do bojo: formação e evolução da Via Láctea
Beneficiário:Maria de Los Angeles Perez Villegas
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 16/13750-6 - O Brasil no espaço: Astrofísica e Engenharia
Beneficiário:Eduardo Janot Pacheco
Linha de fomento: Auxílio à Pesquisa - Temático