Search Publications

NGC 2440 : A morpho-kinematical model

Costa, R. D. D.; Lago, P. J. A.

The 3D structure and position-velocity (P-V) diagrams of NGC 2440 were modeled aiming to describe the morphology of this object, specially its core. High resolution spectra, HST images and P-V diagrams were used to reproduce the 3D structure of the nebula using SHAPE. The best model for the nebula is a torus torn apart in three pieces by interacti…

Variability of the emission line fluxes and ratios of HH 1/2

Raga, A. C.; Reipurth, B.; Castellanos-Ramírez, Bally, J.

We compare spectrophotometric data of HH 1 and 2 obtained in 1978 (by Brugel et al. 1981a) with the emission line fluxes from calibrated Hubble Space Telescope (HST) images obtained in 1994 and 2014. This comparison shows that the emission line ratios of these objects have remained surprisingly invariant during the past 36 years. On the other hand…