Li-rich giant stars under scrutiny: binarity, magnetic activity, and the evolutionary status after Gaia DR2

Autor: Matthieu Castro, B. F. O. Gonçalves, L. de Almeida, J. S. da Costa, J-D do Nascimento

Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN

We present a study of the evolutionary state of a few lithium-rich giant stars based on the Gaia Data Release 2 (DR2) parallaxes and photometry. We also investigate the chromospheric activity, the presence of a surface magnetic field, and the radial

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2dbf6d21c3aa6adee95aabd73cc0bc9a
https://doi.org/10.1093/mnras/staa2408

Optimized cutting off transit algorithm to study stellar rotation from PLATO mission light curves

Autor: Leandro de Almeida, Reza Samadi, Francys Anthony, Jefferson Soares da Costa, Ana Carolina Mattiuci, Matthieu Castro, José Dias do Nascimento

Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Experimental Astronomy
Experimental Astronomy, Springer Link, 2020, 50 (1), pp.73-90. ⟨10.1007/s10686-020-09664-x⟩

Measuring the stellar rotation of one of the components in eclipsing binaries (EBs) or planetary systems is a challenging task. The difficulty is mainly due to the complexity of analyzing, in the same light curve, the signal from the stellar rotation

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::77294ca61f53d326d84a5f0bef2e75f4
http://arxiv.org/abs/2005.07756

Lithium abundance and rotation of seismic solar analogues

Autor: Tharcísyo Duarte, Devika Kamath, Savita Mathur, Paul G. Beck, M. F. Andersen, Ricky Egeland, Matthieu Castro, H. Van Winckel, D. Montes, S. Mathis, O. L. Creevey, Andrew Tkachenko, P. L. Pallé, J. D. do Nascimento, Rafael A. García, David Salabert

Publikováno v: NASA Astrophysics Data System
Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2017, 602, pp.A63. ⟨10.1051/0004-6361/201629820⟩
Astronomy and Astrophysics-A&A, 2017, 602, pp.A63. ⟨10.1051/0004-6361/201629820⟩
Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Beck, P G, do Nascimento, J-D J, Duarte, T S S, Salabert, D, Tkachenko, A, Mathis, S, Mathur, S, García, R A, Castro, M, Palle, P L, Egeland, R, Chapeton-Montes, D, Creevey, O, Andersen, M F, Kamath, S D & Van Winckel, H 2017, ' Lithium abundance and rotation of seismic solar analogues. Solar and stellar connection from Kepler and Hermes observations ', Astronomy & Astrophysics, vol. 602, A63 . https://doi.org/10.1051/0004-6361/201629820

Lithium abundance A(Li) and surface rotation are good diagnostic tools to probe the internal mixing and angular momentum transfer in stars. We explore the relation between surface rotation, A(Li) and age in a sample of seismic solar-analogue (SA) sta

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1c5cd8eb18994d5e2f75c6b09700686
https://lirias.kuleuven.be/handle/123456789/590088

The solar, exoplanet and cosmological lithium problems

Autor: Michael Bazot, Bengt Gustafsson, Ivan Ramirez, Luca Casagrande, David Yong, Martin Asplund, J. D. do Nascimento, Matthieu Castro, Jorge Melendez

Publikováno v: Astrophysics and Space Science. 328:193-200

We review three Li problems. First, the Li problem in the Sun, for which some previous studies have argued that it may be Li-poor compared to other Suns. Second, we discuss the Li problem in planet hosting stars, which are claimed to be Li-poor when

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c2829afa7b193b204635d568268906e
https://doi.org/10.1007/s10509-009-0187-3

HIP 10725: The First Solar Twin/Analogue Field Blue Straggler

Autor: Marcelo Tucci Maia, Maria Lugaro, Matthieu Castro, L. M. Howes, José Dias do Nascimento, Martin Asplund, Jorge Melendez, Marcos A. Faria, Lucas Schirbel, David Yong, Ivan Ramirez, Amanda I. Karakas

Publikováno v: Repositório Institucional da UFRN
Universidade Federal do Rio Grande do Norte (UFRN)
instacron:UFRN
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

[Context]. Blue stragglers are easy to identify in globular clusters, but are much harder to identify in the field. Here we present the serendipitous discovery of one field blue straggler, HIP 10725, that closely matches the Sun in mass and age, but

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::96d1707e875707e9694c202a7cbfd867