Dynamics and Atomic Processes in the Symbiotic Star AG Peg as Derived from Its Emission Line Spectrum

Mattias Eriksson

Dynamics and Atomic Processes in the Symbiotic Star AG Peg as Derived from Its Emission Line Spectrum

Mattias Eriksson

Research output: Thesis › Doctoral Thesis (compilation)

Abstract

The spectra of symbiotic stars are shown to frequently contain numerous fluorescence lines caused by

Photo-excitation by Accidental Resonance (PAR). So far, most work involving fluorescence in stellar spectra has been assigned to the search of new PAR mechanisms, which can explain the presence of certain emission lines. This is taken a step further as the PAR pumped emission lines are analyzed together with their pumping sources, which have enabled us to derive properties such as wind velocities, structure and opacities for the emitting plasma of the symbiotic star AG Peg.

Furthermore, a powerful temperature diagnostic tool involving H Ly alpha pumped Fe~II lines is tested on the Weigelt Blobs of Eta Car, resulting in a temperature estimate of 3500 K.

A majority of the observed ultraviolet emission lines in spectra of symbiotic stars are also explained in terms of

population mechanism and locataion of origin. New ideas about the structure and evolution of symbiotic stars are discussed.

Original language	English
Qualification	Doctor
Awarding Institution
Supervisors/Advisors	Johansson, Sveneric, Supervisor Wahlgren, Glenn, Supervisor Veenhuizen, Hans, Supervisor, External person
Award date	2006 Feb 18
Publisher	KFS AB
ISBN (Print)	91-628-6734-2
Publication status	Published - 2006

Bibliographical note

Defence details

Date: 2006-02-18
Time: 10:15
Place: Lundmarksalen Astronomiska institutionen Lund

External reviewer(s)

Name: Schmid, Hans
Title: Dr
Affiliation: Institute of Astronomy, ETH Zurich

---

<div class="article_info">Mattias Eriksson. <span class="article_issue_date">2004</span>. <span class="article_title">Modeling the wind structure of AG Peg by fitting of C IV and N V resonance doublets</span> <span class="journal_pages">pp 987-999</span>. (accepted)</div>
<div class="article_info">Mattias Eriksson. <span class="article_issue_date">2005</span>. <span class="article_title">Bowen excitation of N III lines in symbiotic stars</span> </div>
<div class="article_info">Mattias Eriksson. <span class="article_issue_date">2006</span>. <span class="article_title">The ultraviolet spectrum of symbiotic stars</span> (accepted)</div>

Subject classification (UKÄ)

Astronomy, Astrophysics and Cosmology

Free keywords

Astronomi
rymdvetenskap
kosmisk kemi
cosmic chemistry
space research
Astronomy
Atom- och molekylärfysik
Atomic and molecular physics
Symbiotic stars
Fluorescence
Atomic processes

Cite this

@phdthesis{df80f1d630bf4f83b5608fe26b600be1,

title = "Dynamics and Atomic Processes in the Symbiotic Star AG Peg as Derived from Its Emission Line Spectrum",

abstract = "The spectra of symbiotic stars are shown to frequently contain numerous fluorescence lines caused by Photo-excitation by Accidental Resonance (PAR). So far, most work involving fluorescence in stellar spectra has been assigned to the search of new PAR mechanisms, which can explain the presence of certain emission lines. This is taken a step further as the PAR pumped emission lines are analyzed together with their pumping sources, which have enabled us to derive properties such as wind velocities, structure and opacities for the emitting plasma of the symbiotic star AG Peg. Furthermore, a powerful temperature diagnostic tool involving H Ly alpha pumped Fe~II lines is tested on the Weigelt Blobs of Eta Car, resulting in a temperature estimate of 3500 K. A majority of the observed ultraviolet emission lines in spectra of symbiotic stars are also explained in terms of population mechanism and locataion of origin. New ideas about the structure and evolution of symbiotic stars are discussed.",

keywords = "Astronomi, rymdvetenskap, kosmisk kemi, cosmic chemistry, space research, Astronomy, Atom- och molekyl{\"a}rfysik, Atomic and molecular physics, Symbiotic stars, Fluorescence, Atomic processes",

author = "Mattias Eriksson",

note = "Defence details Date: 2006-02-18 Time: 10:15 Place: Lundmarksalen Astronomiska institutionen Lund External reviewer(s) Name: Schmid, Hans Title: Dr Affiliation: Institute of Astronomy, ETH Zurich --- <div class={"}article_info{"}>Mattias Eriksson. <span class={"}article_issue_date{"}>2004</span>. <span class={"}article_title{"}>Modeling the wind structure of AG Peg by fitting of C IV and N V resonance doublets</span> <span class={"}journal_pages{"}>pp 987-999</span>. (accepted)</div> <div class={"}article_info{"}>Mattias Eriksson. <span class={"}article_issue_date{"}>2005</span>. <span class={"}article_title{"}>Bowen excitation of N III lines in symbiotic stars</span> </div> <div class={"}article_info{"}>Mattias Eriksson. <span class={"}article_issue_date{"}>2006</span>. <span class={"}article_title{"}>The ultraviolet spectrum of symbiotic stars</span> (accepted)</div>",

year = "2006",

language = "English",

isbn = "91-628-6734-2",

publisher = "KFS AB",

type = "Doctoral Thesis (compilation)",

}

TY - THES

T1 - Dynamics and Atomic Processes in the Symbiotic Star AG Peg as Derived from Its Emission Line Spectrum

AU - Eriksson, Mattias

N1 - Defence details Date: 2006-02-18 Time: 10:15 Place: Lundmarksalen Astronomiska institutionen Lund External reviewer(s) Name: Schmid, Hans Title: Dr Affiliation: Institute of Astronomy, ETH Zurich --- <div class="article_info">Mattias Eriksson. <span class="article_issue_date">2004</span>. <span class="article_title">Modeling the wind structure of AG Peg by fitting of C IV and N V resonance doublets</span> <span class="journal_pages">pp 987-999</span>. (accepted)</div> <div class="article_info">Mattias Eriksson. <span class="article_issue_date">2005</span>. <span class="article_title">Bowen excitation of N III lines in symbiotic stars</span> </div> <div class="article_info">Mattias Eriksson. <span class="article_issue_date">2006</span>. <span class="article_title">The ultraviolet spectrum of symbiotic stars</span> (accepted)</div>

PY - 2006

Y1 - 2006

N2 - The spectra of symbiotic stars are shown to frequently contain numerous fluorescence lines caused by Photo-excitation by Accidental Resonance (PAR). So far, most work involving fluorescence in stellar spectra has been assigned to the search of new PAR mechanisms, which can explain the presence of certain emission lines. This is taken a step further as the PAR pumped emission lines are analyzed together with their pumping sources, which have enabled us to derive properties such as wind velocities, structure and opacities for the emitting plasma of the symbiotic star AG Peg. Furthermore, a powerful temperature diagnostic tool involving H Ly alpha pumped Fe~II lines is tested on the Weigelt Blobs of Eta Car, resulting in a temperature estimate of 3500 K. A majority of the observed ultraviolet emission lines in spectra of symbiotic stars are also explained in terms of population mechanism and locataion of origin. New ideas about the structure and evolution of symbiotic stars are discussed.

AB - The spectra of symbiotic stars are shown to frequently contain numerous fluorescence lines caused by Photo-excitation by Accidental Resonance (PAR). So far, most work involving fluorescence in stellar spectra has been assigned to the search of new PAR mechanisms, which can explain the presence of certain emission lines. This is taken a step further as the PAR pumped emission lines are analyzed together with their pumping sources, which have enabled us to derive properties such as wind velocities, structure and opacities for the emitting plasma of the symbiotic star AG Peg. Furthermore, a powerful temperature diagnostic tool involving H Ly alpha pumped Fe~II lines is tested on the Weigelt Blobs of Eta Car, resulting in a temperature estimate of 3500 K. A majority of the observed ultraviolet emission lines in spectra of symbiotic stars are also explained in terms of population mechanism and locataion of origin. New ideas about the structure and evolution of symbiotic stars are discussed.

KW - Astronomi

KW - rymdvetenskap

KW - kosmisk kemi

KW - cosmic chemistry

KW - space research

KW - Astronomy

KW - Atom- och molekylärfysik

KW - Atomic and molecular physics

KW - Symbiotic stars

KW - Fluorescence

KW - Atomic processes

M3 - Doctoral Thesis (compilation)

SN - 91-628-6734-2

PB - KFS AB

ER -

Dynamics and Atomic Processes in the Symbiotic Star AG Peg as Derived from Its Emission Line Spectrum

Abstract

Bibliographical note

Subject classification (UKÄ)

Free keywords

Fingerprint

Cite this