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7 papers · 1 filter
Applications of precision astrometry to studies of massive YSOs
M. J. Rioja, L. Moscadelli, R. Cesaroni
We present VLBI observations of the HO maser emission towards a selection of massive young stellar objects (YSOs). In one of these sources, IRAS20126+4104, the measured proper…
Molecular abundance ratios as a tracer of accelerated collapse in regions of high mass star formation?
C. J. Lintott, S. Viti, J. M. C. Rawlings +5
Recent observations suggest that the behaviour of tracer species such as N_2H+ and CS is significantly different in regions of high and low mass star formation. In the latter, N_2H…
Lyapunov exponents from unstable periodic orbits in the FPU-beta model
Roberto Franzosi, Pietro Poggi, Monica Cerruti-Sola
In the framework of a recently developed theory for Hamiltonian chaos, which makes use of the formulation of Newtonian dynamics in terms of Riemannian differential geometry, we obt…
Tailoring Phase Space : A Way to Control Hamiltonian Transport
Guido Ciraolo, Cristel Chandre, Ricardo Lima +3
We present a method to control transport in Hamiltonian systems. We provide an algorithm - based on a perturbation of the original Hamiltonian localized in phase space - to design…
Observational tests of the evolution of spheroidal galaxies and predictions for SIRTF/Spitzer cosmological surveys
Laura Silva, Gianfranco De Zotti, Gian Luigi Granato +2
Granato et al(2004) have elaborated a physically grounded model exploiting the mutual feedback between star-forming spheroidal galaxies and the active nuclei growing in their cores…
Dynamics of the circumstellar gas in the Herbig Ae stars BF Orionis, SV Cephei, WW Vulpeculae and XY Persei
A. Mora, C. Eiroa, A. Natta +22
We present high resolution (lambda / Delta_lambda = 49000) echelle spectra of the intermediate mass, pre-main sequence stars BF Ori, SV Cep, WW Wul and XY Per. The spectra cover th…