scholarly journals Nucleosynthesis in exploding massive Wolf-Rayet stars

1988 ◽  
Vol 108 ◽  
pp. 440-441 ◽  
Author(s):  
M.F. El Eid ◽  
N. Langer
Keyword(s):  
Supernova Remnant ◽  
Massive Star ◽  
Young Supernova Remnant ◽  
Cas A

Recent observations of the young supernova remnant Cas A (Fesen et al., 1987) suggest an exploding Wolf-Rayet (WR) star of WNL type as a progenitor of this object. The majority of the WR stars seems to originate from massive O-stars of M > 40 M⊙. According to current investigations (Schild and Maeder, 1984; Langer, 1987; cf. also: Langer, this volume) WNL stars rank among the most massive WR stars. Hence, it is possible to assume that the stellar progenitor of Cas A was indeed a very massive star.As shown by Langer and El Eid (1986), (see also Woosley, 1986) a population I star of initially 100 M⊙ may loose enough mass during its evolution up to core He exhaustion to become a WN star of ∼ 45 M⊙, which then mainly consists of oxygen (more than 80%) synthesized during He burning.

scholarly journals X-ray, Optical and UV Observations of the Young Supernova Remnant in the Irregular Galaxy NGC 4449

1983 ◽  
Vol 101 ◽  
pp. 579-582
Author(s):  
W. P. Blair ◽  
R. P. Kirshner ◽  
P. F. Winkler ◽  
J. C. Raymond ◽  
R. A. Fesen ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Massive Star ◽  
Irregular Galaxy ◽  
Reverse Shock ◽  
X Ray ◽  
Young Supernova Remnant ◽  
Cas A

A powerful young supernova remnant (SNR) similar to Cas A has recently been discovered in the irregular galaxy NGC 4449. We have obtained X-ray, optical and ultraviolet data which allow us to investigate possible models for this object and estimate its age. Several lines of argument indicate a massive star of order 25 M⊙ as the precursor to this remnant. If the x-ray emission is attributed to a reverse shock in the ejecta, the remnant should be ∼ 120 years old.

scholarly journals Gamma-ray line measurements from supernova explosions

2017 ◽  
Vol 12 (S331) ◽  
pp. 157-163 ◽  
Author(s):  
Roland Diehl
Keyword(s):  
Supernova Remnant ◽  
Gamma Ray ◽  
Radioactive Decay ◽  
Line Emission ◽  
Gamma Ray Spectrometry ◽  
Young Supernova Remnant ◽  
Supernova Explosions ◽  
Cas A ◽  
Integral Data ◽  
Gamma Ray Telescopes

AbstractGamma ray lines are expected to be emitted as part of the afterglow of supernova explosions, because radioactive decay of freshly synthesised nuclei occurs. Significant radioactive gamma ray line emission is expected from56Ni and44Ti decay on time scales of the initial explosion (56Ni, τ ~days) and the young supernova remnant (44Ti,τ ~90 years). Less specific, and rather informative for the supernova population as a whole, are lessons from longer lived isotopes such as26Al and60Fe. From isotopes of elements heavier than iron group elements, any interesting gamma-ray line emission is too faint to be observable. Measurements with space-based gamma-ray telescopes have obtained interesting gamma ray line emissions from two core collapse events, Cas A and SN1987A, and one thermonuclear event, SN2014J. We discuss INTEGRAL data from all above isotopes, including all line and continuum signatures from these two objects, and the surveys for more supernovae, that have been performed by gamma ray spectrometry. Our objective here is to illustrate what can be learned from gamma-ray line emission properties about the explosions and their astrophysics.

STRANGE MATTER STARS AND GENERAL RELATIVITY

1998 ◽  
Vol 13 (16) ◽  
pp. 1253-1264 ◽  
Author(s):  
LUIS P. NEIRA CERVILLERA ◽  
ROBERTO O. AQUILANO ◽  
HECTOR VUCETICH
Keyword(s):  
General Relativity ◽  
Supernova Remnant ◽  
Strange Matter ◽  
Relativistic Star ◽  
Young Supernova Remnant ◽  
General Relativistic

In this letter we present a general relativistic star with strange matter to explain in a young supernova remnant the radial millisecond oscillations. The results confirm previous conclusions.

scholarly journals The radio expansion and brightening of the very young supernova remnant G1.9 + 0.3

2008 ◽  
Vol 387 (1) ◽  
pp. L54-L58 ◽  
Author(s):  
D. A. Green ◽  
S. P. Reynolds ◽  
K. J. Borkowski ◽  
U. Hwang ◽  
I. Harrus ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Young Supernova Remnant

X-Ray, Optical and UV Observations of the Young Supernova Remnant in the Irregular Galaxy NGC 4449

1983 ◽  
pp. 579-582
Author(s):  
W. P. Blair ◽  
R. P. Kirshner ◽  
P. F. Winkler ◽  
J. C. Raymond ◽  
R. A. Fesen ◽  
...  
Keyword(s):  
Supernova Remnant ◽  
Irregular Galaxy ◽  
X Ray ◽  
Young Supernova Remnant
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