Post-AGB nebular studies

Lagadec, E.

doi:10.1017/s1743921317000928

Cited by 3 publications

(2 citation statements)

References 47 publications

(56 reference statements)

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“…The global shaping of the nebula must occur at this stage of increased mass-loss (Lagadec 2016). A noteworthy feature seen in many nebulae are the ansae.…”

Section: The Polarization In the Ns And Ss Of Frosty Leomentioning

confidence: 99%

The near-infrared polarization of the pre-planetary nebula Frosty Leo

Bernal

Sabin

Luna

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We present a near-infrared imaging polarimetric study of the pre-planetary nebula: Frosty Leo. The observations were carried out in J, H, and K′ bands using the new polarimeter POLICAN mounted on the 2.1-m telescope of the Guillermo Haro Astrophysical Observatory, Sonora, Mexico. The most prominent result observed in the polarization maps is a large and well-defined dusty envelope (35 arcsec diameter in H band). The polarization position angles in the envelope are particularly well ordered and nearly parallel to the equator of the nebula (seen in J and H bands). The nebula presents a known bipolar outflow and the envelope completely wraps around it. Within the bipolar lobes, we find high polarization levels ranging from $60{{\ \rm per\ cent}}$ (J band) to $90{{\ \rm per\ cent}}$ (K′ band) and the polarization angles trace a centrosymmetric pattern. We found the remnants of superwind shells at the edges of the bipolar lobes and the duration of this phase is around 600 yr. The origin of polarization features in the nebula is most likely due to a combination of single and multiple scattering. Our results clearly demonstrate new structures that provide new hints on the evolution of Frosty Leo from its previous asymptotic giant branch phase.

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“…The global shaping of the nebula must occur at this stage of increased mass-loss (Lagadec 2016). A noteworthy feature seen in many nebulae are the ansae.…”

Section: The Polarization In the Ns And Ss Of Frosty Leomentioning

confidence: 99%

The near-infrared polarization of the pre-planetary nebula Frosty Leo

Bernal

Sabin

Luna

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…The question is of relevance to the late evolution of AGB stars that are known to commonly evolve into Planetary Nebulae having strongly asymmetric morphologies (for recent reviews, see e.g. Habing and Olofsson 2004, Herwig 2005, Marengo 2009, Bujarrabal 2009, Castro-Carrizo et al 2010, Pascoli and Lahoche 2010, Zhao-Geisler 2010, Amiri 2013, Geise 2011, Lagadec 2012and Bujarrabal et al 2013.…”

Section: Introductionmentioning

confidence: 99%

On the central symmetry of the circumstellar envelope of RS Cnc

Nhung¹,

Hoai

Winters

et al. 2015

Res. Astron. Astrophys.

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We present a phenomenological study of CO(1-0) and CO(2-1) emission from the circumstellar envelope (CSE) of the Asymptotic Giant Branch (AGB) star RS Cnc. It reveals departures from central symmetry that turn out to be efficient tools for the exploration of some of the CSE properties. We use a wind model including a bipolar flow with a typical wind velocity of ∼8 km s −1 decreasing to ∼2 km s −1 near the equator to describe Doppler velocity spectral maps obtained by merging data collected at the IRAM Plateau de Bure Interferometer and Pico Veleta single dish radio telescope. Parameters describing the wind morphology and kinematics are obtained, together with the radial dependence of the gas temperature in the domain of the circumstellar envelope probed by the CO observations. Significant north-south central asymmetries are revealed by the analysis, which we quantify using a simple phenomenological description. The origin of such asymmetries is unclear.

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Planetary Nebulae: Sources of Enlightenment

Kwitter

Henry

2022

PASP

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In this review/tutorial we explore planetary nebulae as a stage in the evolution of low-to-intermediate-mass stars, as major contributors to the mass and chemical enrichment of the interstellar medium, and as astrophysical laboratories. We discuss many observed properties of planetary nebulae, placing particular emphasis on element abundance determinations and comparisons with theoretical predictions. Dust and molecules associated with planetary nebulae are considered as well. We then examine distances, binarity, and planetary nebula morphology and evolution. We end with mention of some of the advances that will be enabled by future observing capabilities.

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Post-AGB nebular studies

Cited by 3 publications

References 47 publications

The near-infrared polarization of the pre-planetary nebula Frosty Leo

The near-infrared polarization of the pre-planetary nebula Frosty Leo

On the central symmetry of the circumstellar envelope of RS Cnc

Planetary Nebulae: Sources of Enlightenment

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