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4 papers · 1 filter
Optical spectroscopic variability of Herbig Ae/Be stars
I. Mendigutía, C. Eiroa, B. Montesinos +4
We analysed 337 multi-epoch optical spectra of 38 Herbig Ae/Be (HAeBe) stars to gain insights into the variability behaviour of the circumstellar (CS) atomic gas. Equivalent widths…
Formation of fullerenes in H-containing Planetary Nebulae
D. A. Garcia-Hernandez, A. Manchado, P. Garcia-Lario +5
Hydrogen depleted environments are considered an essential requirement for the formation of fullerenes. The recent detection of C60 and C70 fullerenes in what was interpreted as th…
The secrets of T Pyxidis II. A recurrent nova that will not become a SN Ia
P. Selvelli, A. Cassatella, R. Gilmozzi +1
By various methods, we obtained L 70 L and 1.1 10 Myr. These values were about twice as high in the pre-1…
The mixed chemistry phenomenon in Galactic Bulge PNe
J. V. Perea-Calderon, D. A. Garcia-Hernandez, P. Garcia-Lario +2
We investigate the dual-dust chemistry (DDC) phenomenon in PNe and discuss reasons for its occurrence, by analyzing Spitzer/IRS spectra of a sample of 40 Galactic PNe among which 2…