Pubblicazioni

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COMET C/20

Scritto in Pubblicazioni

Available from the Minor Planet Center.
Available from the Minor Planet Center.

A Comparative Test of CCD Reduction Procedures

Scritto in Pubblicazioni

Three data reduction methods, applicable to time-resolved CCD photometry
of open clusters, are described. A sample set of images is reduced
independently by three people, using various approaches, and the results
are compared. The test reveals systematic differences in the FWHM and
magnitudes produced by the different software. The reduction package
MOMF and pure aperture photometry are found to be equivalent in
precision, but the results obtained with these methods should not be
merged when high precision is required.

Early spectral evolution of Nova Sagittarii 2004 (V5114 Sagittarii)

Scritto in Pubblicazioni

Aims.We present optical and near-infrared spectral evolution of the
Galactic nova <ASTROBJ>V5114 Sgr</ASTROBJ> (2004) during few months
after the outburst.<BR /> Methods: .We use multi-band photometry and
line intensities derived from spectroscopy to put constrains on the
distance and the physical conditions of the ejecta of V5114 Sgr.<BR />
Results: .The nova showed a fast decline (t<SUB>2</SUB> ≃ 11 days)
and spectral features of Fe II spectroscopic class. It reached
M<SUB>V</SUB> = -8.7 ± 0.2 mag at maximum light, from which we
derive a…

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