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Deciphering the bipolar planetary nebula Abell 14 with 3D ionization and morphological studies
- Publication Year :
- 2016
- Publisher :
- arXiv, 2016.
-
Abstract
- Abell 14 is a poorly studied object despite being considered a born again planetary nebula. We performed a detailed study of its 3D morphology and ionization structure using the SHAPE and MOCASSIN codes. We found that Abell 14 is a highly evolved, bipolar nebula with a kinematical age of $\sim$19,400 yr for a distance of 4 kpc. The high He abundance, and N/O ratio indicate a progenitor of 5 $M_{\odot}$ that has experienced the third dredge-up and hot bottom burning phases. The stellar parameters of the central source reveal a star at a highly evolved stage near to the white dwarf cooling track, being inconsistent with the born again scenario. The nebula shows unexpectedly strong [N I] $\lambda 5200$ and [O I] $\lambda 6300$ emission lines indicating possible shock interactions. Abell 14 appears to be a member of a small group of highly evolved, extreme Type-I PNe. The members of this group lie at the lower-left corner of the PNe regime on the [N II]/H$\alpha$ vs. [S II]/H$\alpha$ diagnostic diagram, where shock--excited regions/objects are also placed. The low luminosity of their central stars, in conjunction with the large physical size of the nebulae, result in a very low photo-ionization rate, which can make any contribution of shock interaction easily perceptible, even for small velocities.<br />Comment: 12 pages, 9 figures and 4 tables, accepted for publication in MNRAS
- Subjects :
- catalog
010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
distances
binary
FOS: Physical sciences
Bipolar nebula
Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Luminosity
Emission nebula
intermediate-mass stars
0103 physical sciences
evolution
agb stars
Astrophysics::Solar and Stellar Astrophysics
Emission spectrum
010303 astronomy & astrophysics
photoionization
Astrophysics::Galaxy Astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Physics
Nebula
abundances
ism: abundances
suwt 2
Astronomy
White dwarf
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Planetary nebula
galactic bulge region
Stars
ism: kinematics and dynamics
Astrophysics - Solar and Stellar Astrophysics
binaries: general
Space and Planetary Science
planetary nebulae: individual: abell 14
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics::Earth and Planetary Astrophysics
Subjects
Details
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....eba970ffaec8b656694dba4458311acb
- Full Text :
- https://doi.org/10.48550/arxiv.1601.02170