Collisional-radiative switching - A powerful technique for converging non-LTE calculations
A very simple technique has been developed to converge statistical equilibrium and model atmospheric calculations in extreme non-LTE conditions when the usual iterative methods fail to converge from an LTE starting model. The proposed technique is based on a smooth transition from a collision-domina...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 1988-03, Vol.192 (1-2), p.279-280 |
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| container_title | Astronomy and astrophysics (Berlin) |
| container_volume | 192 |
| creator | Hummer, D. G. Voels, S. A. |
| description | A very simple technique has been developed to converge statistical equilibrium and model atmospheric calculations in extreme non-LTE conditions when the usual iterative methods fail to converge from an LTE starting model. The proposed technique is based on a smooth transition from a collision-dominated LTE situation to the desired non-LTE conditions in which radiation dominates, at least in the most important transitions. The proposed approach was used to successfully compute stellar models with He abundances of 0.20, 0.30, and 0.50; Teff = 30,000 K, and log g = 2.9. |
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G. ; Voels, S. A.</creator><creatorcontrib>Hummer, D. G. ; Voels, S. A.</creatorcontrib><description>A very simple technique has been developed to converge statistical equilibrium and model atmospheric calculations in extreme non-LTE conditions when the usual iterative methods fail to converge from an LTE starting model. The proposed technique is based on a smooth transition from a collision-dominated LTE situation to the desired non-LTE conditions in which radiation dominates, at least in the most important transitions. The proposed approach was used to successfully compute stellar models with He abundances of 0.20, 0.30, and 0.50; Teff = 30,000 K, and log g = 2.9.</description><identifier>ISSN: 0004-6361</identifier><identifier>EISSN: 1432-0746</identifier><identifier>CODEN: AAEJAF</identifier><language>eng</language><publisher>Legacy CDMS: EDP Sciences</publisher><subject>Astronomy ; Astrophysics ; Earth, ocean, space ; Exact sciences and technology ; Stars ; Stellar atmospheres (photospheres, chromospheres, coronae, magnetospheres). Radiative transfer. Opacity and line formation ; Stellar characteristics and properties</subject><ispartof>Astronomy and astrophysics (Berlin), 1988-03, Vol.192 (1-2), p.279-280</ispartof><rights>1988 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=7646623$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Hummer, D. G.</creatorcontrib><creatorcontrib>Voels, S. A.</creatorcontrib><title>Collisional-radiative switching - A powerful technique for converging non-LTE calculations</title><title>Astronomy and astrophysics (Berlin)</title><description>A very simple technique has been developed to converge statistical equilibrium and model atmospheric calculations in extreme non-LTE conditions when the usual iterative methods fail to converge from an LTE starting model. The proposed technique is based on a smooth transition from a collision-dominated LTE situation to the desired non-LTE conditions in which radiation dominates, at least in the most important transitions. The proposed approach was used to successfully compute stellar models with He abundances of 0.20, 0.30, and 0.50; Teff = 30,000 K, and log g = 2.9.</description><subject>Astronomy</subject><subject>Astrophysics</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Stars</subject><subject>Stellar atmospheres (photospheres, chromospheres, coronae, magnetospheres). Radiative transfer. 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A.</creator><general>EDP Sciences</general><scope>CYE</scope><scope>CYI</scope><scope>IQODW</scope></search><sort><creationdate>19880301</creationdate><title>Collisional-radiative switching - A powerful technique for converging non-LTE calculations</title><author>Hummer, D. G. ; Voels, S. A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-n135t-4b09ff1a6090bcfb26cff949cd5009fd6584e8fef337324d82db439af563e3033</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1988</creationdate><topic>Astronomy</topic><topic>Astrophysics</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Stars</topic><topic>Stellar atmospheres (photospheres, chromospheres, coronae, magnetospheres). Radiative transfer. Opacity and line formation</topic><topic>Stellar characteristics and properties</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Hummer, D. G.</creatorcontrib><creatorcontrib>Voels, S. A.</creatorcontrib><collection>NASA Scientific and Technical Information</collection><collection>NASA Technical Reports Server</collection><collection>Pascal-Francis</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Hummer, D. G.</au><au>Voels, S. A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Collisional-radiative switching - A powerful technique for converging non-LTE calculations</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>1988-03-01</date><risdate>1988</risdate><volume>192</volume><issue>1-2</issue><spage>279</spage><epage>280</epage><pages>279-280</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><coden>AAEJAF</coden><abstract>A very simple technique has been developed to converge statistical equilibrium and model atmospheric calculations in extreme non-LTE conditions when the usual iterative methods fail to converge from an LTE starting model. The proposed technique is based on a smooth transition from a collision-dominated LTE situation to the desired non-LTE conditions in which radiation dominates, at least in the most important transitions. The proposed approach was used to successfully compute stellar models with He abundances of 0.20, 0.30, and 0.50; Teff = 30,000 K, and log g = 2.9.</abstract><cop>Legacy CDMS</cop><pub>EDP Sciences</pub><tpages>2</tpages></addata></record> |
| fulltext | fulltext |
| identifier | ISSN: 0004-6361 |
| ispartof | Astronomy and astrophysics (Berlin), 1988-03, Vol.192 (1-2), p.279-280 |
| issn | 0004-6361 1432-0746 |
| language | eng |
| recordid | cdi_pascalfrancis_primary_7646623 |
| source | EDP Sciences; NASA Technical Reports Server; EZB-FREE-00999 freely available EZB journals |
| subjects | Astronomy Astrophysics Earth, ocean, space Exact sciences and technology Stars Stellar atmospheres (photospheres, chromospheres, coronae, magnetospheres). Radiative transfer. Opacity and line formation Stellar characteristics and properties |
| title | Collisional-radiative switching - A powerful technique for converging non-LTE calculations |
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