7 papers · 1 filter
Extremely red stellar objects revealed by IPHAS
N. J. Wright, R. Greimel, M. J. Barlow +13
We present photometric analysis and follow-up spectroscopy for a population of extremely red stellar objects extracted from the point-source catalogue of the INT Photometric H-Alph…
HST and VLT observations of the Symbiotic Star Hen 2-147
M. Santander-Garcia, R. L. M. Corradi, P. A. Whitelock +5
We investigate the dynamics of the nebula around the symbiotic star Hen 2-147, determine its expansion parallax, and compare it with the distance obtained via the Period-Luminosity…
Spectroscopy of Planetary Nebulae in Sextans A and Sextans B
Laura Magrini, Pierre Leisy, Romano L. M. Corradi +3
Sextans A and Sextans B are two dIr galaxies situated in the outskirts of the Local Group (LG), in which both PNe and H II regions have been detected (Jacoby & Lesser 1981, Magrini…
Chemical Abundances and Their Relation with PN Morphological Features
A. Mampaso
Results appeared since the last APN meeting on the relation between abundances and PNe morphological features are reviewed here. Statistical analyses of round, elliptical, and bipo…
New Results on R Aquarii
D. R. Goncalves, A. Mampaso, S. Navarro +1
The first results on new optical data for R Aquarii (based on observations obtained with the 2.5m INT, the 2.5m NOT and the 3.5m NTT) are presented. The morphology and kinematics o…
The Physical Parameters and Excitation of Jets and Knots in PNe
D. R. Goncalves, A. Mampaso, R. M. L. Corradi +1
We are carrying out a study of the physical parameters and excitation of low-ionization structures (LIS) in planetary nebulae (PNe). Since the optical morphology and kinematics of…