Low‐Ionization Structures in Planetary Nebulae: Confronting Models with Observations

Gonçalves, Denise R.; Corradi, R. L. M.; Mampaso, A.

doi:10.1086/318364

Cited by 108 publications

(158 citation statements)

References 69 publications

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“…Narrow-band [NII] or [SII] images are useful in revealing LIS, but they are best isolated by constructing an Hα+[NII]/[OIII] image that removes density variations to highlight just changes in ionisation. Gonçalves et al (2001) reviewed PNe exhibiting LIS, their kinematics and their purported formation mechanisms (see also Gonçalves 2004).…”

Section: Low-ionisation Structuresmentioning

confidence: 99%

“…Exter et al 2003) even though their velocities not substantially different from their nebulae (Gonçalves 2004). We describe knots as unresolved or small LIS with an aspect ratio of unity, and filaments as knots with an aspect ratio larger than unity (Gonçalves et al 2001). We adopt a stricter definition of jets to be opposing polar outflows located well outside the main nebula and with typically lower surface brightness than equatorial filaments (e.g.…”

Section: Low-ionisation Structuresmentioning

confidence: 99%

“…The origin of LIS is uncertain given the considerable diversity in their observed properties (Gonçalves et al 2001), not to mention the sometimes confusing nomenclature (Sec. 3.2).…”

Section: A Binary Formation Scenario For Low-ionisation Structuresmentioning

confidence: 99%

“…We are planning photometric surveys of more biased samples dominated by LIS, but in the meantime we have surveyed the literature as part of a preliminary investigation. Since the Gonçalves et al (2001) review, the number of PNe with LIS has grown considerably thanks to the PNIC that provides multiple emission line archival HST and ground based images (e.g. Schwarz et al 1992;Manchado et al 1996).…”

Section: Can Low-ionisation Structures Be Used To Identify a Previousmentioning

confidence: 99%

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Binary planetary nebulae nuclei towards the Galactic bulge

Miszalski

Acker

Parker

et al. 2009

A&A

147

218

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Considerable effort has been applied towards understanding the precise shaping mechanisms responsible for the diverse range of morphologies exhibited by planetary nebulae (PNe). A binary companion is increasingly gaining support as a dominant shaping mechanism, however morphological studies of the few PNe that we know for certain were shaped by binary evolution are scarce or biased. Newly discovered binary central stars (CSPN) from the OGLE-III photometric variability survey have significantly increased the sample of post common-envelope (CE) nebulae available for morphological analysis. We present Gemini South narrow-band images for most of the new sample to complement existing data in a qualitative morphological study of 30 post-CE nebulae. Nearly 30% of nebulae have canonical bipolar morphologies, however this rises to 60% once inclination effects are incorporated with the aid of geometric models. This is the strongest observational evidence yet linking CE evolution to bipolar morphologies. A higher than average proportion of the sample shows low-ionisation knots, filaments or jets suggestive of a binary origin. These features are also common around emission-line nuclei which may be explained by speculative binary formation scenarios for H-deficient CSPN.

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Section: Low-ionisation Structuresmentioning

confidence: 99%

Section: Low-ionisation Structuresmentioning

confidence: 99%

“…The origin of LIS is uncertain given the considerable diversity in their observed properties (Gonçalves et al 2001), not to mention the sometimes confusing nomenclature (Sec. 3.2).…”

Section: A Binary Formation Scenario For Low-ionisation Structuresmentioning

confidence: 99%

Section: Can Low-ionisation Structures Be Used To Identify a Previousmentioning

confidence: 99%

See 2 more Smart Citations

Binary planetary nebulae nuclei towards the Galactic bulge

Miszalski

Acker

Parker

et al. 2009

A&A

147

218

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“…Gonçalves et al 2001;Corradi 2006). Miszalski et al (2009b) suggested close binaries play a strong role in the formation of LIS after finding an elevated occurrence of LIS in post-CE nebulae.…”

Section: Low-ionisation Filamentsmentioning

confidence: 99%

Discovery of close binary central stars in the planetary nebulae NGC 6326 and NGC 6778

Miszalski

Jones

Rodríguez‐Gil

et al. 2011

A&A

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We present observations proving the close binary nature of the central stars belonging to the planetary nebulae (PNe) NGC 6326 and NGC 6778. Photometric monitoring reveals irradiated lightcurves with orbital periods of 0.372 and 0.1534 days, respectively, constituting firm evidence that they passed through a common-envelope (CE) phase. Unlike most surveys for close binary central stars (CSPN) however, the binary nature of NGC 6326 was first revealed spectroscopically and only later did photometry obtain an orbital period. Gemini South observations revealed a large 160 km s −1 shift between the nebula and emission lines of C III and N III well known to originate from irradiated atmospheres of main-sequence companions. These so-called weak emission lines are fairly common in PNe and measurement of their radial velocity shifts in spectroscopic surveys could facilitate the construction of a statistically significant sample of post-CE nebulae. There is growing evidence that this process can be further accelerated by preselecting nebulae with traits of known post-CE nebulae. Both NGC 6326 and NGC 6778 were selected for their rich attribution of low-ionisation filaments and collimated outflows, thereby strengthening the connection between these traits and post-CE CSPN.

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