Výsledky vyhledávání - "G. D. C. Teixeira"

ODUSSEAS: a machine learning tool to derive effective temperature and metallicity for M dwarf stars

Autor: V. Neves, A. Antoniadis-Karnavas, Nuno C. Santos, E. Delgado-Mena, G. D. C. Teixeira, S. G. Sousa

Publikováno v: Astronomy & Astrophysics. 636:A9

Aims. The derivation of spectroscopic parameters for M dwarf stars is very important in the fields of stellar and exoplanet characterization. The goal of this work is the creation of an automatic computational tool, able to derive quickly and reliabl

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a29dba688ee0104144e71eccb4e2ea97
https://doi.org/10.1051/0004-6361/201937194

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Exploring the stellar properties of M dwarfs with high-resolution spectroscopy from the optical to the near-infrared

Autor: F. Allard, O. Mousis, Ram Kumar Sharma, R. Kamlesh, S. Rajpurohit, A. S. Rajpurohit, G. D. C. Teixeira

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2018, 620, ⟨10.1051/0004-6361/201833500⟩
Astronomy & Astrophysics
Astronomy and Astrophysics-A&A, 2019, 622, ⟨10.1051/0004-6361/201833500e⟩

Context. Being the most numerous and oldest stars in the galaxy, M dwarfs are objects of great interest for exoplanet searches. The presence of molecules in their atmosphere complicates our understanding of their atmospheric properties. But great adv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aa2117cd9c7a70299e1eb12def329358
https://hal-insu.archives-ouvertes.fr/insu-03666239

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Photospheric properties and fundamental parameters of M dwarfs

Autor: G. D. C. Teixeira, S. Rajpurohit, F. Allard, O. Mousis, Derek Homeier, A. S. Rajpurohit

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2018, 610, ⟨10.1051/0004-6361/201731507⟩

M dwarfs are an important source of information when studying and probing the lower end of the Hertzsprung-Russell (HR) diagram, down to the hydrogen-burning limit. Being the most numerous and oldest stars in the galaxy, they carry fundamental inform

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::42b3a7a75b449bcfbde94948ba67fcb2
https://hal-insu.archives-ouvertes.fr/insu-03666280/file/aa31507-17.pdf

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A new spectroscopic calibration to determine Teff and [Fe/H] of FGK dwarfs and giants

Autor: S. G. Sousa, G. D. C. Teixeira, Nuno C. Santos, M. Tsantaki, Mário J. P. F. G. Monteiro, G. Israelian

Publikováno v: EPJ Web of Conferences, Vol 160, p 01013 (2017)

We present a new spectroscopic calibration for a fast estimate of Teff and [Fe/H] for FGK dwarfs and GK giant stars. We used spectra from a joint sample of 708 stars, composed by 451 FGK dwarfs and 257 GK-giant stars with homogeneously determined spe

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a037eba5f10c4504d7601caca033d98
https://doaj.org/article/4ab99c4b259d4943a7d2087911db816c

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SWEET-Cat update and FASMA. A new minimization procedure for stellar parameters using high-quality spectra

Autor: A. C. S. Ferreira, E. Delgado-Mena, Nuno C. Santos, Annelies Mortier, M. Tsantaki, G. D. C. Teixeira, D. T. Andreasen, L. Suarez-Andres, S. G. Sousa

Context: Thanks to the importance that the star-planet relation has to our understanding of the planet formation process, the precise determination of stellar parameters for the ever increasing number of discovered extrasolar planets is of great rele

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4742b9ed451d0bb3dc7e0449fa3a8ab3

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Atmospheric stellar parameters for large surveys using FASMA, a new spectral synthesis package

Autor: Gustavo Bruzual, Nuno C. Santos, S. G. Sousa, G. D. C. Teixeira, M. Tsantaki, D. T. Andreasen, Elisa Delgado-Mena

In the era of vast spectroscopic surveys focusing on Galactic stellar populations, astronomers want to exploit the large quantity and good quality of data to derive their atmospheric parameters without losing precision from automatic procedures. In t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae54d7d5828b5863d7dd020945d99084

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New Teff and [Fe/H] spectroscopic calibration for FGK dwarfs and GK giants

Autor: M. Tsantaki, Garik Israelian, G. D. C. Teixeira, Mário J. P. F. G. Monteiro, S. G. Sousa, Nuno C. Santos

The ever-growing number of large spectroscopic survey programs has increased the importance of fast and reliable methods with which to determine precise stellar parameters. Some of these methods are highly dependent on correct spectroscopic calibrati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fdd08006c601fbedb53fc4fb81d40e8
http://arxiv.org/abs/1608.08392

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Stellar parameters with FASMA: a new spectral synthesis package

Autor: Gustavo Bruzual, G. D. C. Teixeira, M. Tsantaki, Nuno C. Santos, Elisa Delgado-Mena, S. G. Sousa, D. T. Andreasen

Publikováno v: Proceedings of the International Astronomical Union. 12:271-272

Current Galactic surveys, including the Gaia mission, rely on the efficiency of the spectral analysis techniques to provide precise and accurate spectral information (i.e. effective temperature, surface gravity, metallicity, and chemical abundances)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7cf8c2b08a5df21479f5726d3d9e81a8
https://doi.org/10.1017/s1743921317006202

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Photometric variability of massive young stellar objects

Autor: Mário J. P. F. G. Monteiro, J. F. Gameiro, Leigh C. Smith, G. D. C. Teixeira, P. W. Lucas, C. Contreras Peña, C. Morris, J. Borissova, Manjushri Kumar, Dirk Froebrich, A. Carattie o Garatti

Publikováno v: Astronomy & Astrophysics

The VVV survey has allowed for an unprecedented number of multi-epoch observations of the southern Galactic plane. In a recent paper,13 massive young stellar objects(MYSOs) have already been identified within the highly variable(\Delta Ks > 1 mag) YS

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff9b0ea12c4cd4df9c688b0540dab4a9
https://doi.org/10.1051/0004-6361/201833667

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Molecular hydrogen jets and outflows in the Serpens south filamentary cloud

Autor: M. S. N. Kumar, J. M. C. Grave, G. D. C. Teixeira, Rafael Bachiller

We aimed to map the jets and outflows from the Serpens South star forming region and find an empirical relationship between the magnetic field and outflow orientation. Near-infrared H2 v=1-0 S(1) 2.122{\mu}m -line imaging of the \sim 30'-long filamen

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4a146285dfcd072a088c6863c74be63
http://arxiv.org/abs/1204.4946

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