Optical and ultraviolet spectrophotometry of the ONeMg Nova V838 Herculis 1991
Identifieur interne : 002783 ( Main/Merge ); précédent : 002782; suivant : 002784Optical and ultraviolet spectrophotometry of the ONeMg Nova V838 Herculis 1991
Auteurs : Karen M. Vanlandingham [États-Unis] ; Sumner Starrfield [États-Unis] ; R. Mark Wagner [États-Unis] ; Steven N. Shore [États-Unis] ; George Sonneborn [États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 1996-09-11.
Abstract
We present an analysis of optical and UV spectra of the fast nova V838 Herculis 1991. IUE observations began on 1991 March 25 and continued through 1991 August 20, while optical observations began on 1991 March 29 and continued through 1991 August 20. We determine a value for the reddening of E (B − V) ~ 0.5 ± 0.1 and a distance of ~ 3 ± l kpc based both on our own observations and on those of other groups. This nova was remarkable in being both fast and optically thick in the UV at maximum light. Our spectra show strong lines of helium, neon, sulphur and nitrogen. In contrast, oxygen lines were never present in our UV spectra and very weak in our optical spectra. We use a new optimization method to perform an abundance analysis of the spectra, and find that carbon, nitrogen, neon, silicon and sulphur are overabundant with respect to solar material by factors ranging from 5 to 37, while helium and oxygen are both underabundant by a factor of 0.3. Our best model is obtained with a luminosity for the central source of 5.1 × 1036 erg s−1, indicating that this nova may have turned off by two months after outburst. We also find an ejected mass for this nova of Mej ~ 1.8 × 10−4 M⊙. Based on both the characteristics of the outburst and our observed abundances, we suggest that this outburst occurred on a very massive ONeMg white dwarf.
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DOI: 10.1093/mnras/282.2.563
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Optical and ultraviolet spectrophotometry of the ONeMg Nova V838 Herculis 1991</title><author><name sortKey="Vanlandingham, Karen M" sort="Vanlandingham, Karen M" uniqKey="Vanlandingham K" first="Karen M." last="Vanlandingham">Karen M. Vanlandingham</name></author><author><name sortKey="Starrfield, Sumner" sort="Starrfield, Sumner" uniqKey="Starrfield S" first="Sumner" last="Starrfield">Sumner Starrfield</name></author><author><name sortKey="Wagner, R Mark" sort="Wagner, R Mark" uniqKey="Wagner R" first="R. Mark" last="Wagner">R. Mark Wagner</name></author><author><name sortKey="Shore, Steven N" sort="Shore, Steven N" uniqKey="Shore S" first="Steven N." last="Shore">Steven N. Shore</name></author><author><name sortKey="Sonneborn, George" sort="Sonneborn, George" uniqKey="Sonneborn G" first="George" last="Sonneborn">George Sonneborn</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:AF141D44F3A2857E54D6047876C0F436EE56AB31</idno><date when="1996" year="1996">1996</date><idno type="doi">10.1093/mnras/282.2.563</idno><idno type="url">https://api.istex.fr/document/AF141D44F3A2857E54D6047876C0F436EE56AB31/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">000A53</idno><idno type="wicri:Area/Istex/Curation">000A41</idno><idno type="wicri:Area/Istex/Checkpoint">001A50</idno><idno type="wicri:doubleKey">0035-8711:1996:Vanlandingham K:optical:and:ultraviolet</idno><idno type="wicri:Area/Main/Merge">002783</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a">Optical and ultraviolet spectrophotometry of the ONeMg Nova V838 Herculis 1991</title><author><name sortKey="Vanlandingham, Karen M" sort="Vanlandingham, Karen M" uniqKey="Vanlandingham K" first="Karen M." last="Vanlandingham">Karen M. Vanlandingham</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504</wicri:regionArea><placeName><region type="state">Arizona</region></placeName></affiliation></author><author><name sortKey="Starrfield, Sumner" sort="Starrfield, Sumner" uniqKey="Starrfield S" first="Sumner" last="Starrfield">Sumner Starrfield</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504</wicri:regionArea><placeName><region type="state">Arizona</region></placeName></affiliation></author><author><name sortKey="Wagner, R Mark" sort="Wagner, R Mark" uniqKey="Wagner R" first="R. Mark" last="Wagner">R. Mark Wagner</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Astronomy, Ohio State University, 174 W. 18th Avenue, Columbus, OH 43210</wicri:regionArea><placeName><region type="state">Ohio</region></placeName></affiliation></author><author><name sortKey="Shore, Steven N" sort="Shore, Steven N" uniqKey="Shore S" first="Steven N." last="Shore">Steven N. Shore</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Physics and Astronomy, Indiana University South Bend, 1700 Mishawaka Ave, South Bend, IN 46634-7111</wicri:regionArea><placeName><region type="state">Indiana</region></placeName></affiliation></author><author><name sortKey="Sonneborn, George" sort="Sonneborn, George" uniqKey="Sonneborn G" first="George" last="Sonneborn">George Sonneborn</name><affiliation wicri:level="2"><country xml:lang="fr">États-Unis</country><wicri:regionArea>Laboratory for Astronomy and Solar Physics, Code 681, NASA/GSFC, Greenbelt, MD 20771</wicri:regionArea><placeName><region type="state">Maryland</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Monthly Notices of the Royal Astronomical Society</title><title level="j" type="abbrev">Mon. Not. R. Astron. Soc.</title><idno type="ISSN">0035-8711</idno><idno type="eISSN">1365-2966</idno><imprint><publisher>Blackwell Science Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1996-09-11">1996-09-11</date><biblScope unit="volume">282</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="563">563</biblScope><biblScope unit="page" to="579">579</biblScope></imprint><idno type="ISSN">0035-8711</idno></series><idno type="istex">AF141D44F3A2857E54D6047876C0F436EE56AB31</idno><idno type="DOI">10.1093/mnras/282.2.563</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0035-8711</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract">We present an analysis of optical and UV spectra of the fast nova V838 Herculis 1991. IUE observations began on 1991 March 25 and continued through 1991 August 20, while optical observations began on 1991 March 29 and continued through 1991 August 20. We determine a value for the reddening of E (B − V) ~ 0.5 ± 0.1 and a distance of ~ 3 ± l kpc based both on our own observations and on those of other groups. This nova was remarkable in being both fast and optically thick in the UV at maximum light. Our spectra show strong lines of helium, neon, sulphur and nitrogen. In contrast, oxygen lines were never present in our UV spectra and very weak in our optical spectra. We use a new optimization method to perform an abundance analysis of the spectra, and find that carbon, nitrogen, neon, silicon and sulphur are overabundant with respect to solar material by factors ranging from 5 to 37, while helium and oxygen are both underabundant by a factor of 0.3. Our best model is obtained with a luminosity for the central source of 5.1 × 1036 erg s−1, indicating that this nova may have turned off by two months after outburst. We also find an ejected mass for this nova of Mej ~ 1.8 × 10−4 M⊙. Based on both the characteristics of the outburst and our observed abundances, we suggest that this outburst occurred on a very massive ONeMg white dwarf.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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