45 citations · 144 across the 6 of their papers we have counts for
6 papers
NGC 6309, a Planetary Nebula that Shifted from Round to Multipolar
Gabriel Rubio, Roberto Vazquez, Gerardo Ramos-Larios +4
We present new narrow-band Ha, [N II], and [O III] high-resolution images of the quadrupolar planetary nebula (PN) NGC 6309 that show in great detail its bipolar lobes and reveal n…
A spectroscopic census in young stellar regions: the Sigma Orionis cluster
Jesús Hernández, Nuria Calvet, Alice Perez +7
We present a spectroscopic survey of the stellar population of the Sigma Orionis cluster. We have obtained spectral types for 340 stars. Spectroscopic data for spectral typing come…
Discovery of Multiple Shells Around the Planetary Nebula IC 418
Gerardo Ramos-Larios, Roberto Vazquez, Martin A. Guerrero +3
We have analysed optical, near-, and mid-IR images of the bright planetary nebula (PN) IC 418. These images probe unambiguously for the first time a number of low surface brightnes…
Activity induced by Gravitational Interaction in Galaxy Pairs
D. Dultzin, J. J. Gonzalez, Y. Krongold +6
A systematic study of the nuclear emission of a sample of 97 spirals in isolated galaxy pairs with mixed morphology (E+S) shows that: 1) AGN activity is found in 40% of the spiral…
Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634
M. A. Guerrero, L. F. Miranda, A. Riera +6
With its remarkable double-S shape, IC 4634 is an archetype of point-symmetric planetary nebulae (PN). In this paper, we present a detailed study of this PN using archival HST WFPC…
Unveiling the structure of the planetary nebula M 2-48: Kinematics and physical conditions
L. Lopez-Martin, J. A. Lopez, C. Esteban +6
The kinematics and physical conditions of the bipolar planetary nebula M 2-48 are analysed from high and low dispersion long-slit spectra. Previous CCD narrow-band optical observat…