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Article: Two-temperature X-ray emission from the planetary nebula NGC 7293

TitleTwo-temperature X-ray emission from the planetary nebula NGC 7293
Authors
KeywordsPlanetary Nebulae: Individual (Ngc 7293)
X-Rays: Ism
Issue Date1994
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637X
Citation
The Astrophysical Journal, 1994, v. 422 n. 1, p. 205-207 How to Cite?
AbstractROSAT PSPC observations of the planetary nebula NGC are reported here. This planetary nebula is here the first discovered to show clearly two components in its X-ray spectrum. A two-component model consisting of a blackbody and a Raymond-Smith thermal plasma is fitted to the observed ROSAT PSPC spectrum. This results in a temperature of T1 = 1.4 × 105 K for the blackbody component and a temperature T2 = 8.7 × 106 K for the hot plasma component, at a hydrogen column density NH = 1.4 × 1020 cm-2. The temperature of the blackbody component is consistent with the helium Zanstra temperature of the central star, indicating that it may be attributed to the photosphere of the central star. The high-temperature component is possibly from a corona around the central star, which may be related to a strong convection in the star. An alternative explanation is that the hot plasma resides in a hot bubble predicted by the interacting wind model. A lower limit of the electron density in the hot plasma is found to be ∼ 10 cm-3.
Persistent Identifierhttp://hdl.handle.net/10722/179681
ISSN
2015 Impact Factor: 5.909
2015 SCImago Journal Rankings: 3.266

 

DC FieldValueLanguage
dc.contributor.authorLeahy, DAen_US
dc.contributor.authorZhang, CYen_US
dc.contributor.authorKwok, Sen_US
dc.date.accessioned2012-12-19T10:02:48Z-
dc.date.available2012-12-19T10:02:48Z-
dc.date.issued1994en_US
dc.identifier.citationThe Astrophysical Journal, 1994, v. 422 n. 1, p. 205-207en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/179681-
dc.description.abstractROSAT PSPC observations of the planetary nebula NGC are reported here. This planetary nebula is here the first discovered to show clearly two components in its X-ray spectrum. A two-component model consisting of a blackbody and a Raymond-Smith thermal plasma is fitted to the observed ROSAT PSPC spectrum. This results in a temperature of T1 = 1.4 × 105 K for the blackbody component and a temperature T2 = 8.7 × 106 K for the hot plasma component, at a hydrogen column density NH = 1.4 × 1020 cm-2. The temperature of the blackbody component is consistent with the helium Zanstra temperature of the central star, indicating that it may be attributed to the photosphere of the central star. The high-temperature component is possibly from a corona around the central star, which may be related to a strong convection in the star. An alternative explanation is that the hot plasma resides in a hot bubble predicted by the interacting wind model. A lower limit of the electron density in the hot plasma is found to be ∼ 10 cm-3.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/0004-637Xen_US
dc.relation.ispartofThe Astrophysical Journalen_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPlanetary Nebulae: Individual (Ngc 7293)en_US
dc.subjectX-Rays: Ismen_US
dc.titleTwo-temperature X-ray emission from the planetary nebula NGC 7293en_US
dc.typeArticleen_US
dc.identifier.emailKwok, S: deannote@hku.hken_US
dc.identifier.authorityKwok, S=rp00716en_US
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1086/173718-
dc.identifier.scopuseid_2-s2.0-12044258046en_US
dc.identifier.volume422en_US
dc.identifier.issue1en_US
dc.identifier.spage205en_US
dc.identifier.epage207en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridLeahy, DA=7004941920en_US
dc.identifier.scopusauthoridZhang, CY=38260889100en_US
dc.identifier.scopusauthoridKwok, S=22980498300en_US

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