Stellar wind models of central stars of planetary nebulae
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F20%3A00114456" target="_blank" >RIV/00216224:14310/20:00114456 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1051/0004-6361/201937150" target="_blank" >https://doi.org/10.1051/0004-6361/201937150</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/0004-6361/201937150" target="_blank" >10.1051/0004-6361/201937150</a>
Alternative languages
Result language
angličtina
Original language name
Stellar wind models of central stars of planetary nebulae
Original language description
Context. Fast line-driven stellar winds play an important role in the evolution of planetary nebulae, even though they are relatively weak.Aims. We provide global (unified) hot star wind models of central stars of planetary nebulae. The models predict wind structure including the mass-loss rates, terminal velocities, and emergent fluxes from basic stellar parameters.Methods. We applied our wind code for parameters corresponding to evolutionary stages between the asymptotic giant branch and white dwarf phases for a star with a final mass of 0.569 M-circle dot. We study the influence of metallicity and wind inhomogeneities (clumping) on the wind properties.Results. Line-driven winds appear very early after the star leaves the asymptotic giant branch (at the latest for T-eff approximate to 10 kK) and fade away at the white dwarf cooling track (below T-eff = 105 kK). Their mass-loss rate mostly scales with the stellar luminosity and, consequently, the mass-loss rate only varies slightly during the transition from the red to the blue part of the Hertzsprung-Russell diagram. There are the following two exceptions to the monotonic behavior: a bistability jump at around 20 kK, where the mass-loss rate decreases by a factor of a few (during evolution) due to a change in iron ionization, and an additional maximum at about T-eff = 40-50 kK. On the other hand, the terminal velocity increases from about a few hundreds of km s(-1) to a few thousands of km s(-1) during the transition as a result of stellar radius decrease. The wind terminal velocity also significantly increases at the bistability jump. Derived wind parameters reasonably agree with observations. The effect of clumping is stronger at the hot side of the bistability jump than at the cool side.Conclusions. Derived fits to wind parameters can be used in evolutionary models and in studies of planetary nebula formation. A predicted bistability jump in mass-loss rates can cause the appearance of an additional shell of planetary nebula.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Astronomy & Astrophysics
ISSN
0004-6361
e-ISSN
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Volume of the periodical
635
Issue of the periodical within the volume
APR 2 2020
Country of publishing house
FR - FRANCE
Number of pages
14
Pages from-to
1-14
UT code for WoS article
000526658700001
EID of the result in the Scopus database
2-s2.0-85083308923