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Hubble Space Telesc...
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Fransson, ClaesStockholms universitet,Institutionen för astronomi
(author)
Hubble Space Telescope and Ground-based Observations of SN 1993J and SN 1998S : CNO Processing in the Progenitors
- Article/chapterEnglish2005
Publisher, publication year, extent ...
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American Astronomical Society,2005
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:su-30948
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-30948URI
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https://doi.org/10.1086/426495DOI
Supplementary language notes
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Language:English
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Summary in:English
Part of subdatabase
Classification
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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Ground-based and Hubble Space Telescope observations are presented for SN 1993J and SN 1998S. SN 1998S shows strong, relatively narrow circumstellar emission lines of N III-V and C III-IV, as well as broad lines from the ejecta. Both the broad ultraviolet and optical lines in SN 1998S indicate an expansion velocity of ~7000 km s-1. The broad emission components of Lyα and Mg II are strongly asymmetrical after day 72 past the explosion and differ in shape from Hα. Different models based on dust extinction from dust in the ejecta or shock region, in combination with Hα from a circumstellar torus, are discussed. It is concluded, however, that the double-peaked line profiles are more likely to arise as a result of optical depth effects in the narrow, cool, dense shell behind the reverse shock than in a torus-like region. The ultraviolet lines of SN 1993J are broad, with a boxlike shape, coming from the ejecta and a cool, dense shell. The shapes of the lines are well fitted by a shell with inner velocity ~7000 km s-1 and outer velocity ~10,000 km s-1. For both SN 1993J and SN 1998S a strong nitrogen enrichment is found, with N/C~12.4 in SN 1993J and N/C~6.0 in SN 1998S. From a compilation of all supernovae with determined CNO ratios, we discuss the implications of these observations for the structure of the progenitors of Type II supernovae. Based in part on observations obtained with the Hubble Space Telescope, which is operated by AURA, Inc., under NASA contract NAS 5-26555.
Subject headings and genre
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Stars: Circumstellar Matter
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Nuclear Reactions
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Nucleosynthesis
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Abundances
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Stars: Evolution
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Stars: Mass Loss
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Stars: Supernovae: Individual: Alphanumeric: SN 1993J
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Stars: Supernovae: Individual: Alphanumeric: SN 1998S
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Astronomy
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astronomi
Added entries (persons, corporate bodies, meetings, titles ...)
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Challis, Peter M.
(author)
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Chevalier, Roger A.
(author)
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Filippenko, Alexei V.
(author)
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Kirshner, Robert P.
(author)
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Kozma, CeciliaStockholms universitet,Institutionen för astronomi(Swepub:su)cissi
(author)
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Leonard, Douglas C.
(author)
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Matheson, Thomas
(author)
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Baron, E.
(author)
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Garnavich, Peter
(author)
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Jha, Saurabh
(author)
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Leibundgut, Bruno
(author)
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Lundqvist, PeterStockholms universitet,Institutionen för astronomi(Swepub:su)lundq
(author)
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Pun, C. S. J.
(author)
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Wang, Lifan
(author)
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Wheeler, J. Craig
(author)
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Stockholms universitetInstitutionen för astronomi
(creator_code:org_t)
Related titles
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In:Astrophysical Journal: American Astronomical Society622, s. 991-10070004-637X1538-4357
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Fransson, Claes
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Kozma, Cecilia
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Leonard, Douglas ...
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Matheson, Thomas
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Baron, E.
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Garnavich, Peter
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Lundqvist, Peter
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Pun, C. S. J.
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Wang, Lifan
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