Stark broadening in radio recombination lines towards the Orion Nebula
An investigation of Stark broadening in hydrogen radio recombination lines was made by observing a series of adjacent higher order lines and a higher frequency unbroadened n-alpha line. Two different diameter telescopes provided the same angular resolution for the complete set of the lines. Collisio...
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| Veröffentlicht in: | Astronomy and astrophysics (Berlin) 1984-06, Vol.135 (1), p.116-121 |
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| container_title | Astronomy and astrophysics (Berlin) |
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| creator | SMIRNOV, G. T SOROCHENKO, R. L PANKONIN, V |
| description | An investigation of Stark broadening in hydrogen radio recombination lines was made by observing a series of adjacent higher order lines and a higher frequency unbroadened n-alpha line. Two different diameter telescopes provided the same angular resolution for the complete set of the lines. Collisional widths are proportional to n to the 4.4 power for quantum level n of about 60 to 174, in agreement with the current theory of Stark broadening. Two different sets of lines were observed with 1.5 and 2.6 arcmin beams toward the Orion Nebula to study effects of beam averaging on the observational characteristics of broadening. An increase of the beamwidth from 1.5 to 2.6 arcmin results in a decrease of the n-dependence of the collisional widths from 4.4 to 3.8 which can be explained by a nonhomogeneous model of the Nebula. Calculations of Stark broadening applied to the 1.5 arcmin observations give electron densities of (1 + or - 0.3) 10,000/cu cm. |
| format | Article |
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Calculations of Stark broadening applied to the 1.5 arcmin observations give electron densities of (1 + or - 0.3) 10,000/cu cm.</description><identifier>ISSN: 0004-6361</identifier><identifier>EISSN: 1432-0746</identifier><identifier>CODEN: AAEJAF</identifier><language>eng</language><publisher>Les Ulis: EDP Sciences</publisher><subject>Astronomy ; Earth, ocean, space ; Exact sciences and technology ; H ii regions. Emission and reflection nebulae ; Interstellar medium (ism) and nebulae in milky way ; Stellar systems. Galactic and extragalactic objects and systems. 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An increase of the beamwidth from 1.5 to 2.6 arcmin results in a decrease of the n-dependence of the collisional widths from 4.4 to 3.8 which can be explained by a nonhomogeneous model of the Nebula. Calculations of Stark broadening applied to the 1.5 arcmin observations give electron densities of (1 + or - 0.3) 10,000/cu cm.</description><subject>Astronomy</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>H ii regions. Emission and reflection nebulae</subject><subject>Interstellar medium (ism) and nebulae in milky way</subject><subject>Stellar systems. Galactic and extragalactic objects and systems. 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L ; PANKONIN, V</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-p145t-7417aaf876ce84f52c5e9145ed6d06120171a95c7c1ce921c2500a8839d039313</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1984</creationdate><topic>Astronomy</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>H ii regions. Emission and reflection nebulae</topic><topic>Interstellar medium (ism) and nebulae in milky way</topic><topic>Stellar systems. Galactic and extragalactic objects and systems. The universe</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>SMIRNOV, G. T</creatorcontrib><creatorcontrib>SOROCHENKO, R. L</creatorcontrib><creatorcontrib>PANKONIN, V</creatorcontrib><collection>Pascal-Francis</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Astronomy and astrophysics (Berlin)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>SMIRNOV, G. T</au><au>SOROCHENKO, R. L</au><au>PANKONIN, V</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Stark broadening in radio recombination lines towards the Orion Nebula</atitle><jtitle>Astronomy and astrophysics (Berlin)</jtitle><date>1984-06-01</date><risdate>1984</risdate><volume>135</volume><issue>1</issue><spage>116</spage><epage>121</epage><pages>116-121</pages><issn>0004-6361</issn><eissn>1432-0746</eissn><coden>AAEJAF</coden><abstract>An investigation of Stark broadening in hydrogen radio recombination lines was made by observing a series of adjacent higher order lines and a higher frequency unbroadened n-alpha line. Two different diameter telescopes provided the same angular resolution for the complete set of the lines. Collisional widths are proportional to n to the 4.4 power for quantum level n of about 60 to 174, in agreement with the current theory of Stark broadening. Two different sets of lines were observed with 1.5 and 2.6 arcmin beams toward the Orion Nebula to study effects of beam averaging on the observational characteristics of broadening. An increase of the beamwidth from 1.5 to 2.6 arcmin results in a decrease of the n-dependence of the collisional widths from 4.4 to 3.8 which can be explained by a nonhomogeneous model of the Nebula. Calculations of Stark broadening applied to the 1.5 arcmin observations give electron densities of (1 + or - 0.3) 10,000/cu cm.</abstract><cop>Les Ulis</cop><pub>EDP Sciences</pub><tpages>6</tpages></addata></record> |
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| ispartof | Astronomy and astrophysics (Berlin), 1984-06, Vol.135 (1), p.116-121 |
| issn | 0004-6361 1432-0746 |
| language | eng |
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| source | EDP Sciences; EZB Electronic Journals Library |
| subjects | Astronomy Earth, ocean, space Exact sciences and technology H ii regions. Emission and reflection nebulae Interstellar medium (ism) and nebulae in milky way Stellar systems. Galactic and extragalactic objects and systems. The universe |
| title | Stark broadening in radio recombination lines towards the Orion Nebula |
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