scholarly journals Supernova searches and rates

2013 ◽  
Vol 9 (S296) ◽  
pp. 37-44
Author(s):  
Enrico Cappellaro
Keyword(s):  
Stellar Evolution ◽  
Rapid Development ◽  
Cosmic Time ◽  
Stellar Populations ◽  
Evolution Theory ◽  
Direct Link ◽  
Local Universe ◽  
Crucial Test

AbstractSupernova statistics, establishing a direct link between stellar populations and explosion scenarios, is a crucial test of stellar evolution theory. Nowadays, a number of SN searches in the local Universe and at high redshifts are allowing observational probes of long standing theoretical scenarios. I will briefly review some of the most interesting results in particular for what concern the evolution with cosmic time of the SN rate, which is one of the topic that in the last few years had a most rapid development.

scholarly journals Lessons from the local Universe

2019 ◽  
Vol 15 (S352) ◽  
pp. 315-315
Author(s):  
Daniel Weisz
Keyword(s):  
Galaxy Evolution ◽  
Stellar Evolution ◽  
Cosmic Time ◽  
Local Universe ◽  
The Imf

AbstractResolved galaxies in the local Universe are fundamentally connected to galaxies observed at all cosmic epochs. The IMF, extinction law, distance ladder, and stellar evolution are all anchored in observations of resolved stars in the nearby Universe. In this talk, I highlight new links between resolved galaxies and those in the higher redshift Universe, and discuss how future observations of resolved stars are essential for a complete and accurate census of galaxy evolution across cosmic time.

scholarly journals Stellar Populations in Star Clusters: The Role Played by Stochastic Effects

2002 ◽  
Vol 207 ◽  
pp. 616-624 ◽  
Author(s):  
Gustavo Bruzual A.
Keyword(s):  
Stellar Evolution ◽  
Ad Hoc ◽  
Star Clusters ◽  
Stellar Populations ◽  
Evolution Theory ◽  
Agb Stars ◽  
Population Synthesis ◽  
Stochastic Effects

In this paper I combine the results of a set of population synthesis models with simple Montecarlo simulations of stochastic effects in the number of stars occupying sparsely populated stellar evolutionary phases, to show that the scatter observed in the magnitudes and colors of LMC and NGC 7252 star clusters can be understood in the framework of current stellar evolution theory, without the need to introduce ad-hoc corrections (e.g. artificially increasing the number of AGB stars).

scholarly journals The size and mass evolution of the massive galaxies over cosmic time

2012 ◽  
Vol 8 (S295) ◽  
pp. 27-36
Author(s):  
Ignacio Trujillo
Keyword(s):  
Structural Evolution ◽  
Cosmic Time ◽  
Stellar Populations ◽  
Massive Galaxies ◽  
Active Line ◽  
Satellite Galaxies ◽  
Compact Galaxies ◽  
Minor Mergers ◽  
Stellar Properties

AbstractOnce understood as the paradigm of passively evolving objects, the discovery that massive galaxies experienced an enormous structural evolution in the last ten billion years has opened an active line of research. The most significant pending question in this field is the following: which mechanism has made galaxies to grow largely in size without altering their stellar populations properties dramatically? The most viable explanation is that massive galaxies have undergone a significant number of minor mergers which have deposited most of their material in the outer regions of the massive galaxies. This scenario, although appealing, is still far from be observationally proved since the number of satellite galaxies surrounding the massive objects appears insufficient at all redshifts. The presence also of a population of nearby massive compact galaxies with mixture stellar properties is another piece of the puzzle that still does not nicely fit within a comprehensive scheme. I will review these and other intriguing properties of the massive galaxies in this contribution.

scholarly journals Massive stars in their death throes

2008 ◽  
Vol 366 (1884) ◽  
pp. 4441-4452 ◽  
Author(s):  
John J Eldridge
Keyword(s):  
Stellar Evolution ◽  
Massive Stars ◽  
Evolution Theory ◽  
Luminous Blue Variables ◽  
Show Evidence ◽  
Red Supergiants ◽  
Working Backwards

The study of the stars that explode as supernovae used to be a forensic study, working backwards from the remnants of the star. This changed in 1987 when the first progenitor star was identified in pre-explosion images. Currently, there are eight detected progenitors with another 21 non-detections, for which only a limit on the pre-explosion luminosity can be placed. This new avenue of supernova research has led to many interesting conclusions, most importantly that the progenitors of the most common supernovae, type IIP, are red supergiants, as theory has long predicted. However, no progenitors have been detected thus far for the hydrogen-free type Ib/c supernovae, which, given the expected progenitors, is an unlikely result. Also, observations have begun to show evidence that luminous blue variables, which are among the most massive stars, may directly explode as supernovae. These results contradict the current stellar evolution theory. This suggests that we may need to update our understanding.

scholarly journals Disentangling discrepancies between stellar evolution theory and sub-solar mass stars

2003 ◽  
Vol 409 (2) ◽  
pp. 611-618 ◽  
Author(s):  
E. Lastennet ◽  
J. Fernandes ◽  
D. Valls-Gabaud ◽  
E. Oblak
Keyword(s):  
Stellar Evolution ◽  
Evolution Theory ◽  
Solar Mass

Guglielmo Marconi and Radioastronomy

1996 ◽  
Vol 175 ◽  
pp. 1-4
Author(s):  
Giancarlo Setti
Keyword(s):  
Antenna Array ◽  
Radio Signal ◽  
Rapid Development ◽  
100Th Anniversary ◽  
Direct Link ◽  
Radio Communications ◽  
Guglielmo Marconi ◽  
Great Discovery ◽  
First Time

The decision to hold this IAU Symposium at Bologna on the occasion of the 100th anniversary of the discovery of the wireless telegraphy represents in itself a recognition of the widespread feeling of a historical link between the great discovery of Guglielmo Marconi and the birth of radioastronomy. Obviously, it is not a direct link. We all well know that the birth of radioastronomy must be traced back to the year 1932 when Karl Jansky recognized for the first time the existence of a radio signal probably associated with a celestial source. This a classical example of a ‘serendipitous’ discovery made while Jansky was investigating for the Bell Telephone Laboratories the sources of radio interferences with a rotating antenna array operating at about 14 m wavelength. The study of local disturbances was of primary importance in the rapid development of radio communications which had been geared by the Marconi's discovery.

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