The chemical composition of Galactic planetary nebulae with regard to inhomogeneity in the gas density in their envelopes

Holovatyy, V. V.; Havrilova, N. V.

doi:10.1134/1.1923548

Cited by 4 publications

(7 citation statements)

References 19 publications

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“…The elemental abundances of the nebula agree well with the results of Holovatyy & Havrilova (2005) and Milingo et al (2002b), except the argon and sulfur elements which show slightly lower and higher abundances, respectively (Table 4). The determined N/O ratio are consistent with other works.…”

Section: Morphologiessupporting

confidence: 88%

IFU Spectroscopy of Southern Planetary Nebulae V: Low-Ionisation Structures

Ali

Dopita

2017

Publ. Astron. Soc. Aust.

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In this 5th paper of the series, we examine the spectroscopy and morphology of four southern Galactic planetary nebulae Hen 2-141, NGC 5307, IC 2553, and PB 6 using new integral field spectroscopy data. The morphologies and ionization structures of the sample are given as a set of emission-line maps. In addition, the physical conditions, chemical compositions, and kinematical characteristics of these objects are derived. The results show that PB 6 and Hen 2-141 are of very high excitation classes and IC 2553 and NGC 5307 are mid to high excitation objects. The elemental abundances reveal that PB 6 is of Type I, Hen 2-141 and IC 2553 are of Type IIa, and NGC 5307 of Type IIb/III. The observations unveil the presence of welldefined low-ionization structures or "knots" in all objects. The diagnostic diagrams reveal that the excitation mechanism of these knots is probably by photo-ionization of dense material by the nebular central stars. The physical analysis of six of these knots show no significant differences with their surrounding nebular gas, except their lower electron densities. In spite of the enhancement of the low-ionization emission lines of these knots, their chemical abundances are nearly comparable to their surrounding nebulae, with the exception of perhaps slightly higher nitrogen abundances in the NGC 5307 knots. The integrated spectrum of IC 2553 reveals that nearly all key lines that have led researchers to characterize its central star as a weak-emission line star type are in fact of nebular origin.

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Section: Morphologiessupporting

confidence: 88%

IFU Spectroscopy of Southern Planetary Nebulae V: Low-Ionisation Structures

Ali

Dopita

2017

Publ. Astron. Soc. Aust.

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“…Визначення хемiчного складу ПТ проведено [17] для двох основних типiв неоднорiдностей густини газу в оболонках туманностей. Для першого типу неоднорiдностей I (макронеоднорiдностi) густина газу в радiяльному напрямку оболонки ПТ описана емпiричною формулою, знайденою в роботi [18] iз карт iзофоту лiнiї H β для реальних ПТ.…”

Section: визначення хемIчного складу планетарних туманностейunclassified

“…Для виведення нових виразiв для ЙКМ ПТ ми розрахували двi сiтки ФМС [17] з урахуванням двох згаданих вище типiв неоднорiдности газу на основi Lycспектрiв ядер ПТ, якi ми отримали з моделей зоряних атмосфер Клеґґа i Мiддлемасса [20] шляхом корекцiї їх за наявнiсть зоряного вiтру [21]. Одержанi iнтеґральнi спектри сiтки ФМС ми використали для виведення йонного вмiсту тим самим дiягностичним методом [14], який використовували далi для виведення йонного вмiсту в реальних ПТ.…”

Section: визначення хемIчного складу планетарних туманностейunclassified

“…Одержанi iнтеґральнi спектри сiтки ФМС ми використали для виведення йонного вмiсту тим самим дiягностичним методом [14], який використовували далi для виведення йонного вмiсту в реальних ПТ. Одержаний йонний умiст застосували для виведення нових ЙКМ для ПТ, вирази для яких опублiкованi в наших працях [6,17]. Як i з виведенням ЙКМ для БККГ, такий пiдхiд дає змогу протестувати кожен iз виразiв на вiдтворення хемiчного вмiсту, заданого пiд час розрахунку сiтки ФМС.…”

Section: визначення хемIчного складу планетарних туманностейunclassified

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Determination of the primordial helium abundance Y_p and its enrichment dY/dZ on the basis of chemical composition of the HII region in blue compact galaxies and planetary nebulae

Holovatyy¹,

Melekh²,

Havrylova³

2007

J. Phys. Stud.

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Хемiчний склад зон Hii у блакитних компактних карликових галактиках та планетарних туманностей (ПТ), який ми отримали за допомогою нових виразiв для йонiзацiйно-корекцiйних множникiв та оптимiзованих фотойонiзацiйних моделей свiтiння небулярного газу, використано для уточнення вмiсту первинного гелiю Yp та темпу його збагачення dY /dZ пiд час хемiчної еволюцiї речовини. Показано, що одночасне використання хемiчного складу зон Hii та ПТ для визначення Yp та dY /dZ збiльшує точнiсть останнього.Ключовi слова: зони Hii, блакитнi компактнi карликовi галактики, оптимiзованi фотойонiзацiйнi моделi свiтiння, хемiчний умiст.

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“…Using the FREE_DIAGN code, we derived electron temperatures T e , electron densities n e , ionic abundances, and chemical compositions for individual laments of the Crab Nebula. This code incorporates the ionization-correction factors (ICFs) for planetary nebulae to account for density inhomogeneities within the nebular gas [6].…”

mentioning

confidence: 99%

Modeling the Radial Distribution of Chemical Compositions in Crab Nebula Filaments

Havrylova,

Melekh,

Holovatyy}

2023

Visn. Lviv. Univ., Ser. Phys.

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The chemical compositions within the filaments of the Crab Nebula were determined using a 3-stage optimized photoionization modeling method of the nebular gas, employing diagnostic ratios between emission line intensities. The radial distribution of chemical compositions within the Crab Nebula filaments was analyzed using observed data obtained from seven distinct aperture positions on the Crab Nebula filaments. Our results do not confirm an increase of the relative abundance of chemical elements in the outward direction obtained previously by diagnostic method.

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The chemical composition of Galactic planetary nebulae with regard to inhomogeneity in the gas density in their envelopes

Cited by 4 publications

References 19 publications

IFU Spectroscopy of Southern Planetary Nebulae V: Low-Ionisation Structures

IFU Spectroscopy of Southern Planetary Nebulae V: Low-Ionisation Structures

Determination of the primordial helium abundance Y_p and its enrichment dY/dZ on the basis of chemical composition of the HII region in blue compact galaxies and planetary nebulae

Modeling the Radial Distribution of Chemical Compositions in Crab Nebula Filaments

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The chemical composition of Galactic planetary nebulae with regard to inhomogeneity in the gas density in their envelopes

Cited by 4 publications

References 19 publications

IFU Spectroscopy of Southern Planetary Nebulae V: Low-Ionisation Structures

IFU Spectroscopy of Southern Planetary Nebulae V: Low-Ionisation Structures

Determination of the primordial helium abundance Yp and its enrichment dY/dZ on the basis of chemical composition of the HII region in blue compact galaxies and planetary nebulae

Modeling the Radial Distribution of Chemical Compositions in Crab Nebula Filaments

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Determination of the primordial helium abundance Y_p and its enrichment dY/dZ on the basis of chemical composition of the HII region in blue compact galaxies and planetary nebulae