A SPECTROSCOPIC AND PHOTOMETRIC STUDY OF THE PLANETARY NEBULAE Kn 61 AND Pa 5

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 medium-resolution spectroscopic observations, deep narrow-band imaging, and integral photometry. This material allows u...

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Bibliographic Details
Published in:The Astronomical journal 2014-09, Vol.148 (3), p.1-9
Main Authors: Garcia-Diaz, Ma T, Gonzalez-Buitrago, D, Lopez, J A, Zharikov, S, TOVMASSIAN, G, Borisov, N, VALYAVIN, G
Format: Article
Language:English
Subjects:
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
DISTANCE
EMISSION
HYDROGEN
Imaging
Kinematics
PHOTOMETRY
PLANETARY NEBULAE
RESOLUTION
SPECTRA
Spectroscopic analysis
SPECTROSCOPY
SPHERICAL CONFIGURATION
Spherical shells
STARS
SURFACES
VELOCITY
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Summary: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 medium-resolution spectroscopic observations, deep narrow-band imaging, and integral photometry. This material allows us to identify the morphological components and study their kinematics. The direct images and spectra indicate an absence of the characteristic [NII] and [SII] emission lines in both nebulae. The nebular spectrum of Kn 61 suggests a hydrogen deficient planetary nebula and the stellar spectrum of the central star reveals a hydrogen-deficient PG 1159-type star. The [OIII] position velocity diagram reveals that Kn 61 is a closed, empty, spherical shell with a thin border and a filamentary surface expanding at 67.6 km s super(-1) and the shell is currently not expanding isotropically. We derived a kinematic age of ~1.6 x 10 super(4) yr for an assumed distance of 4kpc. A photometric period of ~5.7(+ or -0.4) days has been detected for Kn 61, indicating the presence of a possible binary system at its core. A possible link between filamentary spherical shells and PG 1159-type stars is noted. The morphology of Pa 5 is dominated by an equatorial toroid and faint polar extensions. The equatorial region of this planetary nebula is expanding at 45.2km s super(-1). The stellar spectrum corresponds to a very hot star and is dominated by a steep blue rising continuum and He II, Balmer, and Ca II photospheric lines.
ISSN:0004-6256
1538-3881
1538-3881
DOI:10.1088/0004-6256/148/3/57