2002A&A...384..408M


Query : 2002A&A...384..408M

2002A&A...384..408M - Astronomy and Astrophysics, volume 384, 408-413 (2002/3-3)

Strongly decelerated expansion of SN 1979C.

MARCAIDE J.M., PEREZ-TORRES M.A., ROS E., ALBERDI A., DIAMOND P.J., GUIRADO J.C., LARA L., VAN DYK S.D. and WEILER K.W.

Abstract (from CDS):

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 λ18cm. 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±2yrs 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∼1.6M, 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∼0.9M. If SN1979C originated in a binary star, the low value of Menv 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.

Abstract Copyright:

Journal keyword(s): techniques: interferometric - supernovae: individual: SN1979C - ISM: supernova remnants - radio continuum: stars - galaxies: individual: M100

CDS comments: in ref list YOUNG 1989ApJ...342L..79Y instead ApJ.342.79

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 SN 1987A SN* 05 35 28.020 -69 16 11.07           SNIIpec 4784 2
2 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1364 1
3 PKS J1200+1523 Rad 12 00 33 +15 23.9   19.5       ~ 2 0
4 TXS 1214+161 Rad 12 17 24.30 +15 55 06.5           ~ 2 0
5 M 100 AGN 12 22 54.9299993592 +15 49 20.296257960 10.04 10.05 9.35     ~ 1762 2
6 SN 1979C SN* 12 22 58.58 +15 47 52.7   11.6       SNIIL 567 1
7 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 6833 3

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2023.02.08-02:12:00

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