All

What are you looking for?

All
Projects
Results
Organizations

Quick search

  • Projects supported by TA ČR
  • Excellent projects
  • Projects with the highest public support
  • Current projects

Smart search

  • That is how I find a specific +word
  • That is how I leave the -word out of the results
  • “That is how I can find the whole phrase”

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

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • 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

  • 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