{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/70663"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/70663","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"The Physical Nature of The Symbiotic Stars","abstract":"The physical nature of the peculiar emission-line objects known as symbiotic stars is examined. The available observations of these objects can be understood best if they are binaries consisting of a late-type giant and a hot component which ionizes a gaseous nebula.","abstract_html":"The physical nature of the peculiar emission-line objects known as symbiotic stars is examined. The available observations of these objects can be understood best if they are binaries consisting of a late-type giant and a hot component which ionizes a gaseous nebula.","abstract_has_math":false,"creators":["Kenyon, Scott Jay"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Astronomy","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-12-16T00:55:14Z","date_published":"2014-12-16T00:55:14Z","updated_at":"2026-07-22T22:26:03Z","subjects":["Physics, Astronomy and Astrophysics"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8409968"],"render_values":[{"text":"(UMI)AAI8409968","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/70663","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Kenyon, Scott Jay"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2014-12-16T00:55:14Z","10000-01-01","1983"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Astronomy"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Astronomy and Astrophysics"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/70663","(UMI)AAI8409968"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The physical nature of the peculiar emission-line objects known as symbiotic stars is examined. The available observations of these objects can be understood best if they are binaries consisting of a late-type giant and a hot component which ionizes a gaseous nebula.","New 2-4 micron low resolution spectra of symbiotic stars are compared to spectra of normal M-type giants and supergiants. The 14 symbiotics observed in this study have the strong CO absorption band at 2.29 microns that is characteristic of M-type giants and supergiants. CI Cyg, T CrB and Z And have CO bands which are comparable in strength to some M-type supergiants and bright giants, suggesting these systems contain very evolved stars on the asymptotic giant branch. The remaining systems have CO bands resembling those observed in normal M-type giants.","New optical spectrophotometric observations show long-term variability in Z And, CI Cyg and AX Per which appear to be eclipses. An analysis of the strong H I, He I and He II emission lines implies effective temperatures of 100,000 K and luminosities of 1000 L(,(CIRCLE)) are appropriate for most symbiotic hot components. The {O III} and {Fe VII} line intensities require low density nebulae in some symbiotics (log n = 6; e.g. V1016 Cyg) and high density nebulae in others (log n = 9; e.g. CI Cyg).","Spectrum synthesis techniques have been used to determine the physical nature of symbiotic hot components. The UV continua of many symbiotics (e.g. CI Cyg and AX Per) are produced in an accretion disk surrounding a low mass main sequence star. These binaries may evolve into cataclysmic variables. Most other systems (e.g. EG And and V443 Her) appear to be hot stellar sources with effective temperatures of 25-100,000 K. Such binaries probably evolve into planetary nebulae with double white dwarf nuclei.","Made available in DSpace on 2014-12-16T00:55:14Z (GMT). No. of bitstreams: 1 8409968.pdf: 10267767 bytes, checksum: 224567b5eac5093406eb22ab8bec38e7 (MD5) Previous issue date: 1983","Embargo set by: Seth Robbins for item 70829 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","357 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983."]},{"key":"dc:title","label":"Title","values":["The Physical Nature of The Symbiotic Stars"]}]}],"canonical_facts":{"dc:creator":["Kenyon, Scott Jay"],"dc:date":["2014-12-16T00:55:14Z","10000-01-01","1983"],"dc:description":["The physical nature of the peculiar emission-line objects known as symbiotic stars is examined. The available observations of these objects can be understood best if they are binaries consisting of a late-type giant and a hot component which ionizes a gaseous nebula.","New 2-4 micron low resolution spectra of symbiotic stars are compared to spectra of normal M-type giants and supergiants. The 14 symbiotics observed in this study have the strong CO absorption band at 2.29 microns that is characteristic of M-type giants and supergiants. CI Cyg, T CrB and Z And have CO bands which are comparable in strength to some M-type supergiants and bright giants, suggesting these systems contain very evolved stars on the asymptotic giant branch. The remaining systems have CO bands resembling those observed in normal M-type giants.","New optical spectrophotometric observations show long-term variability in Z And, CI Cyg and AX Per which appear to be eclipses. An analysis of the strong H I, He I and He II emission lines implies effective temperatures of 100,000 K and luminosities of 1000 L(,(CIRCLE)) are appropriate for most symbiotic hot components. The {O III} and {Fe VII} line intensities require low density nebulae in some symbiotics (log n = 6; e.g. V1016 Cyg) and high density nebulae in others (log n = 9; e.g. CI Cyg).","Spectrum synthesis techniques have been used to determine the physical nature of symbiotic hot components. The UV continua of many symbiotics (e.g. CI Cyg and AX Per) are produced in an accretion disk surrounding a low mass main sequence star. These binaries may evolve into cataclysmic variables. Most other systems (e.g. EG And and V443 Her) appear to be hot stellar sources with effective temperatures of 25-100,000 K. Such binaries probably evolve into planetary nebulae with double white dwarf nuclei.","Made available in DSpace on 2014-12-16T00:55:14Z (GMT). No. of bitstreams: 1 8409968.pdf: 10267767 bytes, checksum: 224567b5eac5093406eb22ab8bec38e7 (MD5) Previous issue date: 1983","Embargo set by: Seth Robbins for item 70829 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs","U of I Only","357 p.","Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983."],"dc:identifier":["http://hdl.handle.net/2142/70663","(UMI)AAI8409968"],"dc:subject":["Physics, Astronomy and Astrophysics"],"dc:title":["The Physical Nature of The Symbiotic Stars"],"dc:type":["text"],"thesis:degree_discipline":["Astronomy"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:26:03Z"}