172 citations · 366 across the 7 of their papers we have counts for
7 papers
NGC 6153: Reality is complicated
Michael G. Richer, Anabel Arrieta, Lorena Arias +4
We study the kinematics of emission lines that arise from many physical processes in NGC 6153 based upon deep, spatially-resolved, high resolution spectra acquired with the UVES sp…
The Discrepant Kinematics of ORLs and CELs in NGC 7009 as a Function of Ionization Structure
Michael G. Richer, Leonid Georgiev, Anabel Arrieta +1
We present spatially- and velocity-resolved echelle spectroscopy for NGC 7009 obtained with the UVES spectrograph at the European Southern Observatory's Very Large Telescope. Our o…
A new outburst in LMC-N66
Miriam Pena, M. Teresa Ruiz, Patricio Rojo +2
This is the first report on the new outburst presented by the central star of the LMC-N66 nebula. This object was classified as a planetary nebula, however, its true nature is unde…
Broad Halpha wings in Nebulae around Evolved Stars and in Young Planetary Nebulae
A. Arrieta, S. Torres-Peimbert
Eleven objects that have been reported as proto-planetary nebula or as young planetary nebulae that show very extended Halpha wings are presented. The extension of these wings is l…
Optical Recombination Lines of Heavy-elements in Giant Extragalactic HII Regions
C. Esteban, M. Peimbert, S. Torres-Peimbert +1
We present high resolution observations of the giant extragalactic H II regions NGC 604, NGC 2363, NGC 5461 and NGC 5471, based on observations taken with the ISIS spectrograph on…
Temperature Variations and Abundance Determinations in Planetary Nebulae
Silvia Torres-Peimbert, Manuel Peimbert
It is argued that an important fraction of PNe present large temperature variations that are not due to observational errors nor to incomplete atomic physics. Seven possible causes…