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Strongly decelerated expansion of SN1979C

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Strongly decelerated expansion of SN1979C

dc.contributor.author	Marcaide Osoro, Juan María
dc.contributor.author	Pérez Torres, Miguel Ángel
dc.contributor.author	Ros Ibarra, Eduardo
dc.contributor.author	Alberdi, A.
dc.contributor.author	Diamond, P. J.
dc.contributor.author	Guirado Puerta, Jose Carlos
dc.contributor.author	Lara, L.
dc.contributor.author	Van Dyk, S. D.
dc.contributor.author	Weiler, K.W.
dc.date.accessioned	2010-06-18T08:00:36Z
dc.date.available	2010-06-18T08:00:36Z
dc.date.issued	2002
dc.identifier.citation	Marcaide Osoro, Juan María ; Pérez Torres, Miguel Ángel ; Ros, E. ; Alberdi, A. ; Diamond, P. J. ; Guirado Puerta, Jose Carlos ; Lara, L. ; Van Dyk, S.D. ; Weiler, K.W., 2002, Strongly decelerated expansion of SN1979C, Astronomy and Astrophysics, vol. 384, no. 2, p. 408-413	en
dc.identifier.uri	http://hdl.handle.net/10550/12983
dc.description.abstract	We observed SN1979C in M100 on 4 June 1999, about twenty years after explosion, with a very sensitive four-antenna VLBI array at the wavelength of λ 18 cm. The distance to M100 and the expansion velocities are such that the supernova cannot be fully resolved by our Earth-wide array. Model-dependent sizes for the source have been determined and compared with previous results. We conclude that the supernova shock was initially in free expansion for 6+- 2 yrs and then experienced a very strong deceleration. The onset of deceleration took place a few years before the abrupt trend change in the integrated radio flux density curves. We estimate the shocked swept-up mass to be Msw ~1.6 Mo, assuming a standard density profile for the CSM. Such a swept-up mass for SN1979C suggests a mass of the hydrogen-rich envelope ejected at explosion no larger than Menv ~ 0.9 Mo. If SN1979C originated in a binary star, the low value of Menv suggests that the companion of the progenitor star stripped o most of the hydrogen-rich envelope mass of the presupernova star prior to the explosion.	en
dc.language.iso	en	en
dc.subject	Interferometric ; Supernovae ; SN1979C ; ISM ; Supernova remnants ; Radio continuum ; Stars ; M100 ; Galaxies	en
dc.title	Strongly decelerated expansion of SN1979C	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia	en
dc.identifier.doi	10.1051/0004-6361:20011794	en
dc.identifier.idgrec	053997	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/articles/aa/pdf/2002/11/aah3030.pdf	en