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Confirmation of the Luminous Blue Variable status of MWC 930
A. S. Miroshnichenko, N. Manset, S. V. Zharikov +14
We present spectroscopic and photometric observations of the emission-line star MWC 930 (V446 Sct) during its long-term optical brightening in 2006--2013. Based on our earlier data…
On the nature of sn stars. I. A detailed abundance study
C. Saffe, H. Levato
The sn stars present sharp Balmer lines, sharp metallic lines and broad coreless He I lines. Initially Abt & Levato proposed a shell-like nature to explain the sn stars, although t…
Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum
C. G. Díaz, J. F. González, H. Levato +1
We propose a method for measuring the projected rotational velocity with high-precision even in spectra with blended lines. Though not automatic, our method is designed t…
Fast Mid-IR Flashes Detected During Small Solar X-Ray Bursts
Marta M. Cassiano, Pierre Kaufmann, Rogerio Marcon +6
Solar observations in the mid-infrared 8-14 μ\m band continuum were carried out with cadence of 5 frames per second, in December 2007. Rapid small heated sources, with typical dura…
Submillimeter and X-ray observations of an X Class flare
C. G. Gimenez de Castro, G. Trottet, A. Silva-Valio +5
The GOES X1.5 class flare that occurred on August 30,2002 at 1327:30 UT is one of the few events detected so far at submillimeter wavelengths. We present a detailed analysis of thi…