38 citations · 201 across the 12 of their papers we have counts for
12 papers
The five axes of the Turtle: symmetry and asymmetry in NGC 6210
William J. Henney, J. A. López, Ma. T. García-Díaz +1
We carry out a comprehensive kinematic and morphological study of the asymmetrical planetary nebula: NGC 6210, known as the Turtle. The nebula's spectacularly chaotic appearance ha…
From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula
J. V. Hernández Santisteban, J. Echevarría, S. Zharikov +15
We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high proper motion cataclysmic variable V1838 Aql. The data were obtained dur…
The Owl and other strigiform nebulae: multipolar cavities within a filled shell
Ma. T. García-Díaz, W. Steffen, W. J. Henney +4
We present the results of long-slit echelle spectroscopy and deep narrow-band imaging of the Owl Nebula (NGC 3587), obtained at the \textit{Observatorio Astronómico Nacional, San P…
Internal Proper-Motions in the Eskimo Nebula
Ma. T. García-Díaz, L. Gutiérrez, W. Steffen +2
We present measurements of internal proper motions at more than five hundred positions of NGC 2392, the Eskimo Nebula, based on images acquired with WFPC2 on board the Hubble Space…
A spectroscopic and photometric study of the planetary nebulae Kn 61 and Pa 5
Ma. T. García-Díaz, D. González-Buitrago, J. A. López +4
We present the first morpho-kinematical analysis of the planetary nebulae Kn 61 and Pa 5 and explore the nature of their central stars. Our analysis is based on high resolution and…
On the SW Sex-Type Eclipsing Cataclysmic Variable SDSS0756+0858
Gagik Tovmassian, Mercedes Stephania Hernandez, Diego Gonzalez-Buitrago +2
We conducted a spectroscopic and photometric study of SDSS J075653.11+085831. X-ray observations were also attempted. We determined the orbital period of this binary system to be 3…
A Detailed Morpho-Kinematic Model of the Eskimo, NGC 2392. A Unifying View with the Cat's Eye and Saturn Planetary Nebulae
Ma. T. García-Díaz, J. A. López, W. Steffen +1
The 3-D and kinematic structure of the Eskimo nebula, NGC 2392, has been notoriously difficult to interpret in detail given its complex morphology, multiple kinematic components an…
The accretion disk in the post period-minimum cataclysmic variable SDSS J080434.20+510349.2
S. Zharikov, G. Tovmassian, A. Aviles +3
This study of SDSS0804 is primarily concerned with the double-hump shape in the light curve and its connection with the accretion disk in this bounce-back system. Time-resolved pho…
Morpho-kinematic analysis of the point-symmetric, bipolar planetary nebulae Hb 5 and K 3-17, a pathway to poly-polarity
J. A. López, Ma. T. García-Díaz, W. Steffen +2
The kinematics of the bipolar planetary nebulae Hb~5 and K 3-17 are investigated in detail by means of a comprehensive set of spatially resolved high spectral resolution, long-slit…
The filamentary Multi-Polar Planetary Nebula NGC 5189
L. Sabin, R. Vázquez, J. A. López +2
We present a set of optical and infrared images combined with long-slit, medium and high dispersion spectra of the southern planetary nebula (PN) NGC 5189. The complex morphology o…
The outflows and 3D structure of NGC 6337, a planetary nebula with a close binary nucleus
Ma. T. García-Díaz, D. M. Clark, J. A. López +2
NGC 6337 is a member of the rare group of planetary nebulae where a close binary nucleus has been identified. The nebula's morphology and emission line profiles are both unusual, p…
Velocity Structure in the Orion Nebula. II. Emission Line Atlas of Partially Ionized to Fully Ionized Gas
Ma. T. García-Díaz, W. J. Henney, J. A. López +2
We present an atlas of three-dimensional (position-position-velocity) spectra of the Orion Nebula in optical emission lines from a variety of different ionization stages: [O I] 630…