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Date and Time of the Query: 2019-08-21 T11:18:54 PDT
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For refcode 2002A&A...384..408M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2002A&A...384..408M Strongly decelerated expansion of SN 1979C J. M. Marcaide, M. A. Perez-Torres, E. Ros, A. Alberdi, P. J. Diamond, J. C. Guirado, L. Lara, S. D. Van Dyk and K. W. Weiler Departamento de Astronomia, Universitat de Valencia, 46100 Burjassot, Spain Istituto di Radioastronomia/CNR, via P. Gobetti 101, 40129 Bologna, Italy Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, 53121 Bonn, Germany Instituto de Astrofisica de Andalucia, CSIC, Apdo. Correos 3004, 18080 Granada, Spain MERLIN/VLBI National Facility, Jodrell Bank Observatory, Macclesfield, Cheshire SK11 9DL, UK Infrared Processing and Analysis Center, California Institute of Technology, Mail Code 100-22, Pasadena, CA 91125, USA Remote Sensing Division, Naval Research Laboratory, Code 7213, Washington, DC 20375-5320, USA Received 20 July 2001/Accepted 11 December 2001 Abstract. We observed SN 1979C in M100 on 4 June 1999, about twenty years after explosion, with a very sensitive four-antenna VLBI array at the wavelength of {lambda}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 M_sw_ ~ 1.6 M_sun_, assuming a standard density profile for the CSM. Such a swept-up mass for SN 1979C suggests a mass of the hydrogen-rich envelope ejected at explosion no larger than M_env_ ~ 0.9 M_sun_. If SN 1979C originated in a binary star, the low value of M_env_ suggests that the companion of the progenitor star stripped off most of the hydrogen-rich envelope mass of the presupernova star prior to the explosion. Key words: techniques: interferometric - supernovae: individual: SN 1979C - ISM: supernova remnants - radio continuum: stars - galaxies: individual: M100
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