Search Results - "Porto de Mello, G F"

Fine structure of the age–chromospheric activity relation in solar-type stars: II. Hα line by Souza dos Santos, P V, Porto de Mello, G F, Costa-Bhering, E, Lorenzo-Oliveira, D, Almeida-Fernandes, F, Dutra-Ferreira, L, Ribas, I

“…ABSTRACT Excess chromospheric emissions within deep photospheric lines are effective proxies of stellar magnetism for FGK stars. This emission decays with…”
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Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey by Grieves, N, Ge, J, Thomas, N, Willis, K, Ma, B, Lorenzo-Oliveira, D, Queiroz, A B A, Ghezzi, L, Chiappini, C, Anders, F, Dutra-Ferreira, L, Porto de Mello, G F, Santiago, B X, da Costa, L N, Ogando, R L C, del Peloso, E F, Tan, J C, Schneider, D P, Pepper, J, Stassun, K G, Zhao, B, Bizyaev, D, Pan, K

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A link between the semimajor axis of extrasolar gas giant planets and stellar metallicity by Pinotti, R., Arany-Prado, L., Lyra, W., Porto de Mello, G. F.

“…The fact that most extrasolar planets found to date are orbiting metal-rich stars lends credence to the core accretion mechanism of gas giant planet formation…”
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A Hale-like Cycle in the Solar Twin 18 Scorpii by do Nascimento, J.-D., Barnes, S. A., Saar, S. H., de Mello, G. F. Porto, Hall, J. C., Anthony, F., de Almeida, L., Velloso, E. N., da Costa, J. S., Petit, P., Strugarek, A., Wargelin, B. J., Castro, M., Strassmeier, K. G., Brun, A. S.

“…Characterizing the cyclic magnetic activity of stars that are close approximations of our Sun offers our best hope for understanding our Sun’s current and past…”
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Evolution of the Solar Activity Over Time and Effects on Planetary Atmospheres. II. κ1 Ceti, an Analog of the Sun when Life Arose on Earth by Ribas, I, Porto de Mello, G. F, Ferreira, L. D, Hébrard, E, Selsis, F, Catalán, S, Garcés, A, do Nascimento, J. D, de Medeiros, J. R

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The most common habitable planets – II. Salty oceans in low-mass habitable planets and global climate evolution by Pinotti, R, Porto de Mello, G F

“…ABSTRACT Global climate evolution models for habitable Earth-like planets do not consider the effect of ocean salinity on land ice formation through the…”
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Correction to: Fine structure of the age–chromospheric activity relation in solar-type stars: II. Hα line by Souza dos Santos, P V, Porto de Mello, G F, Costa-Bhering, E, Lorenzo-Oliveira, D, Almeida-Fernandes, F, Dutra-Ferreira, L, Ribas, I

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The Ursa Major Moving Group: a chronochemokinematic analysis by Dopcke, Gustavo, Porto de Mello, G F, Sneden, C

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Copper and barium abundances in the Ursa Major Moving Group by Castro, S., de Mello, G. F. Porto, Silva, L. da

“…We present Cu and Ba abundances for seven GK dwarf stars, members of the solar-metallicity, 0.3-Gyr-old Ursa Major Moving Group. All analysed member stars show…”
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HR 6094: A Young Solar-Type, Solar-Metallicity Barium Dwarf Star by Porto de Mello, G. F, da Silva, L

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EVOLUTION OF THE SOLAR ACTIVITY OVER TIME AND EFFECTS ON PLANETARY ATMOSPHERES. II. κ 1 Ceti, AN ANALOG OF THE SUN WHEN LIFE AROSE ON EARTH by Ribas, I., Porto de Mello, G. F., Ferreira, L. D., Hébrard, E., Selsis, F., Catalán, S., Garcés, A., do Nascimento, J. D., de Medeiros, J. R.

“…The early evolution of Earth's atmosphere and the origin of life took place at a time when physical conditions at the Earth where radically different from its…”
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The Most Common Habitable Planets II -- Salty Oceans in Low Mass Habitable Planets and Global Climate Evolution by Pinotti, R, de Mello, G. F. Porto

“…Global climate evolution models for habitable earthlike planets do not consider the effect of ocean salinity on land ice formation through the hydrological…”
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Zero age planetary orbit of gas giant planets revisited: reinforcement of the link with stellar metallicity by Pinotti, R, Boechat-Roberty, H M, deMello, G FPorto

“…In 2005, we suggested a relation between the optimal locus of gas giant planet formation, prior to migration, and the metallicity of the host star, based on…”
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Magnetic field and wind of Kappa Ceti: towards the planetary habitability of the young Sun when life arose on Earth by NascimentoJr, J. -D. do, Vidotto, A. A, Folsom, P. Petit C, Castro, M, Marsden, S. C, Morin, J, de Mello, G. F. Porto, Meibom, S, Jeffers, S. V, Guinan, E, Ribas, I

“…We report magnetic field measurements for Kappa1~Cet, a proxy of the young Sun when life arose on Earth. We carry out an analysis of the magnetic properties…”
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A photometric and spectroscopic survey of solar twin stars within 50 parsecs of the Sun: I. Atmospheric parameters and color similarity to the Sun by de Mello, G. F. Porto, da Silva, R, da Silva, L, de Nader, R. V

“…Solar twins and analogs are fundamental in the characterization of the Sun's place in the context of stellar measurements, as they are in understanding how…”
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High-resolution spectropolarimetric of k Cet: A proxy for the young Sun by NascimentoJr, J. D. do, Petit, P, Marsden, S, de Mello, G. F. Porto, Ribas, I, Jeffers, S, Castro, M, Guinan, E, Collaboration, the Bcool

“…"Magnetic Fields Throughout Stellar Evolution", Proceedings IAU Symposium No. 302, 2013, P. Petit, M.M. Jardine & H.C. Spruit, eds Among the solar proxies…”
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The future of the Sun: an evolved solar twin revealed by CoRoT by NascimentoJr, J. -D. do, Takeda, Y, Melendez, J, da Costa, J. S, de Mello, G. F. Porto, Castro, M

“…The question of whether the Sun is peculiar within the class of solar-type stars has been the subject of active investigation over the past three decades…”
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Accurate and homogeneous abundance patterns in solar-type stars of the solar neighbourhood: a chemo-chronological analysis by da Silva, R, de Mello, G. F. Porto, Milone, A. C, da Silva, L, Ribeiro, L. S, Rocha-Pinto, H. J

“…We report the abundances of C, Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Sm in 25 solar-type stars in the solar…”
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Overview of semi-sinusoidal stellar variability with the CoRoT satellite by De Medeiros, J. R, Lopes, C. E. Ferreira, Leao, I. C, Martins, B. L. Canto, Catelan, M, Baglin, A, Vieira, S, Bravo, J. P, Cortes, C, de Freitas, D. B, Janot-Pacheco, E, Maciel, S. C, Melo, C. H. F, Osorio, Y, de Mello, G. F. Porto, Valio, A

“…To date, the CoRoT space mission has produced more than 124,471 light curves. Classifying these curves in terms of unambiguous variability behavior is…”
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Ruthenium and hafnium abundances in giant and dwarf barium stars by Allen, D. M, de Mello, G. F. Porto

“…We present abundances for Ru and Hf, compare them to abundances of other heavy elements, and discuss the problems found in determining Ru and Hf abundances…”
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