An unexpected dust cloud was identified around asteroid 596 Scheila on early December 2010 [1]. Our team has been monitoring its photometric behavior in order to get clues on the nature of the outburst, and the obtained results support that the dust cloud was generated by an impact as recently suggested [2].
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Multiband photometry of asteroid 596 Scheila after its December 2011 outburstTrigo-Rodriguez, J. M. et al.102011
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Multidimensional statistical analysis using artificial neural networks - Astronomical applications
We present a new method based on artificial neural networks trained with multiseed backpropagation, for displaying an n-dimensional distribution in a projected space of one, two, or three dimensions. As principal component analysis (PCA) the proposed method is useful for extracting information on the structure of the data set, but unlike the PCA
Serra-Ricart, Miquel et al.Fecha de publicación:
101993 -
Multilevel Line Transfer with the Implicit Integral Method
Once the need for an iterative procedure in order to solve the problem of the formation of spectral lines in the case of a model atom with many energy levels, the sequel is to seek for the most effective form of such an iterative scheme. It is an almost universal is assumed within all the iterative methods for the solution of those radiative
Crivellari, L. et al.Fecha de publicación:
102002 -
Multiple major outbursts from a restless luminous blue variable in NGC 3432
We present new photometric and spectroscopic observations of an unusual luminous blue variable (LBV) in NGC 3432, covering three major outbursts in 2008 October, 2009 April and 2009 November. Previously, this star experienced an outburst also in 2000 (known as SN 2000ch). During outbursts the star reached an absolute magnitude between -12.1 and -12
Pastorello, A. et al.Fecha de publicación:
102010 -
Multiwavelength Observations of Short-Timescale Variability in NGC 4151. I. Ultraviolet Observations
We present the results of an intensive ultraviolet monitoring campaign on the Seyfert I galaxy NGC 4151, as part of an effort to study its short-timescale variability over a broad range in wavelength. The nucleus of NGC 4151 was observed continuously With the International Ultraviolet Explorer for 9.3 days, yielding a pair of LWP and SWP spectra
Crenshaw, D. M. et al.Fecha de publicación:
101996 -
Multiwavelength Observations of Short-Timescale Variability in NGC 4151. IV. Analysis of Multiwavelength Continuum Variability
This paper combines data from the three preceding papers in order to analyze the multi-wave-band variability and spectral energy distribution of the Seyfert I galaxy NGC 4151 during the 1993 December monitoring campaign. The source, which was near its peak historical brightness, showed strong, correlated variability at X-ray, ultraviolet, and
Edelson, R. A. et al.Fecha de publicación:
101996