We present the kinematics of a sample of bipolar planetary nebulae (PNs) which cover a wide range of observed morphologies and collimation degrees, from bipolar PNs (BPNs) with a marked equatorial ring and wide lobes to highly collimated objects. We use an empirical model in order to derive the expansion velocity, collimation degree, and

We present a kinematic analysis of the double-barred early-type galaxy NGC 357. The radial velocity and velocity dispersion profiles along both the nuclear bar axis and the semi-major axis clearly reveal the presence of the two bars. The results indicate that the bulge is pressure supported whereas the |vr|/σ ratio shows a plateau along the nuclear

We report on the discovery of over 50 strong Hα emitting objects towards the large OB association Cyg OB2 and the HII region DR 15 on its southern periphery. This was achieved using the INT Photometric Hα Survey of the Northern Galactic Plane (IPHAS), combined with follow-up spectroscopy using the MMT multi-object spectrometer HectoSpec. We present

We present results derived from Hα images of 327 local galaxies from the HaGS (Hα Galaxy Survey), where we have correlated the star formation rates with the interaction characteristics of the galaxies. We see a significant increase in the star formation rate in galaxies with close neighbors, an increase which has probably been triggered by galaxy

We present some global results of the PhD thesis research carried out by López-Sánchez (2006), in which a detailed morphological, photometric and spectroscopic analysis of a sample of 20 Wolf-Rayet (WR) galaxies was carried out. The main aims are the study of the star formation and O and WR stellar populations in these galaxies, and the role that

Starbursts are events in which hundreds of solar masses per year of gas are transformed into stars on timescales much shorter than the Hubble time. They are essential in galaxy evolution as they are responsible for the largest part of the chemically enriched material in the interstellar and intergalactic medium where the metals have been deposited