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NGC 2579 and the carbon and oxygen abundance gradients beyond the solar circle

Autor: Esteban, C., Carigi, L., Copetti, M. V. F., García-Rojas, J., Mesa-Delgado, A., Castañeda, H. O., Péquignot, D.

We present deep echelle spectrophotometry of the Galactic HII region NGC 2579. The data have been taken with the Very Large Telescope Ultraviolet-Visual Echelle Spectrograph in the 3550--10400 \AA\ range. This object, which has been largely neglected

Externí odkaz: http://arxiv.org/abs/1304.6927

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A distance scale of planetary nebulae based on mid-infrared data

Autor: Ortiz, R., Copetti, M. V. F., Lorenz-Martins, S.

Some of the most successful statistical methods for obtaining distances of planetary nebulae (PNe) are based on their apparent sizes and radio emission intensities. These methods have the advantage of being "extinction-free" and are especially suited

Externí odkaz: http://arxiv.org/abs/1108.2466

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Electron temperature fluctuations in NGC 346

Autor: Oliveira, V. A., Copetti, M. V. F., Krabbe, A. C.

The existence and origin of large spatial temperature fluctuations in HII regions and planetary nebulae are assumed to explain the differences between the heavy element abundances inferred from collisionally excited and recombination lines, although

Externí odkaz: http://arxiv.org/abs/0810.5020

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A study of the neglected Galactic HII region NGC 2579 and its companion ESO 370-9

Autor: Copetti, M. V. F., Oliveira, V. A., Riffel, R., Castañeda, H. O., Sanmartim, D.

The Galactic HII region NGC 2579 has stayed undeservedly unexplored due to identification problems which persisted until recently. Both NGC 2579 and its companion ESO 370-9 have been misclassified as planetary or reflection nebula, confused with each

Externí odkaz: http://arxiv.org/abs/0707.2062

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Studying nonlinear effects on the early stage of phase ordering using a decomposition method

Autor: Copetti, M. I. M., Krein, G., Machado, J. M., de Carvalho, R. S. Marques

Publikováno v: Phys.Lett. A338 (2005) 232-238

Nonlinear effects on the early stage of phase ordering are studied using Adomian's decomposition method for the Ginzburg-Landau equation for a nonconserved order parameter. While the long-time regime and the linear behavior at short times of the theo

Externí odkaz: http://arxiv.org/abs/cond-mat/0503586

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