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2001. http://www.mso.anu.edu.au/seminars/abstracts/20150410-1440.html
. I would like to solicit the opinions of RSAA staff+students in the next couple of weeks as the decision whether to proceed will be taken in the near future.
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150410-1440.html -- 3.9 Кб -- 10.04.2016
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2002. http://www.mso.anu.edu.au/seminars/abstracts/20150410-1420.html
... Most of these events are thought to be explosions of Carbon-Oxygen White Dwarfs, but recent developments suggest that WDs with alternative compositions may contribute. But there is also the possibility of oxygen-neon white dwarf (ONe WD) or Carbon-Oxygen-Neon-hybrid white dwarf (CONe WD) progenitors in some of the explosion scenarios. I will present results from recent hydrodynamical simulations of explosions in Oxygen-Neon and hybrid Carbon-Oxygen-Neon WDs. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150410-1420.html -- 4.5 Кб -- 10.04.2016
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2003. http://www.mso.anu.edu.au/seminars/abstracts/20150410-1400.html
The abundance of lithium in metal-poor, near-main-sequence stars lies well below the value obtained from Standard Big Bang Nucleosynthesis constrained by the result of the Wilkinson Microwave Anisotropy Probe. ... For example, the Plateau has been described as: (i) ultrathin but postprimordial (Ryan et al. 1999); broken (Melendez et al 2010); and (iii) undergoing meltdown (Bonifacio et al 2010). ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150410-1400.html -- 4.8 Кб -- 10.04.2016
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2004. http://www.mso.anu.edu.au/seminars/abstracts/20150409-1100.html
Sun-like stars end their lives in a phase of catastrophic mass loss. ... The ejecta are briefly visible as an ionized, expanding planetary nebula surrounding a hot pre-white dwarf star. The mass loss of Sun-like stars is crucial to both stellar and galactic evolution: it is responsible for the mass distribution of white dwarfs, about half the local ISM, most of the carbon in the Universe, much of the dust and half of all elements heavier than iron. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150409-1100.html -- 4.9 Кб -- 10.04.2016
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2005. http://www.mso.anu.edu.au/seminars/abstracts/20150402-1100.html
The upper limit to stellar masses is unclear, as is the relative importance of nature (stellar physics) and nurture (formation environment) to the limit. ... Despite some uncertainties in the linear growth rate, we conclude that these modes saturate nonlinearly at small and harmless amplitudes. Vigorous, optically thick winds driven by the Rosseland-mean opacity near 100,000 K are more likely to limit the main-sequence lifetime. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150402-1100.html -- 4.4 Кб -- 10.04.2016
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2006. http://www.mso.anu.edu.au/seminars/abstracts/20150331-1100.html
Post-Asymptotic Giant Branch (post-AGB) stars bear signatures of the entire chemical and morphological changes that occur prior to and during the AGB phase of evolution. ... In this talk, I will present two important outcomes of this survey. Firstly, this survey resulted in a well characterised sample of binary and single post-AGB stars. ... However, some objects show peculiar chemical signatures which do not correspond to the accepted single/binary star evolution and nucleosynthesis. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150331-1100.html -- 5.7 Кб -- 10.04.2016
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2007. http://www.mso.anu.edu.au/seminars/abstracts/20150327-1420.html
There is now strong evidence for stars that have been born with initial helium mass fractions as high as Y=0.40, such as in the globular cluster Omega Centauri. However, the evolution, chemical yields, and final fates of helium-rich stars are poorly understood. In this talk, I will present results for the evolution and nucleosynthesis of asymptotic giant branch models with masses of 3 to 6 Msun at a metallicity of [Fe/H] ~= -1.4 with He-normal and He-rich compositions. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150327-1420.html -- 4.2 Кб -- 10.04.2016
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2008. http://www.mso.anu.edu.au/seminars/abstracts/20150327-1400.html
Snapshot Supernova, a collaboration between Skymapper, Zooniverse and BBC Stargazing Live, is a recent citizen scientists project where Zooites and BBC viewers were asked to scan for supernova candidates in SkyMapper data and the candidates were then followed up using the NTT as part of the PESSTO survey. ... Thanks to the amazing efforts of our volunteers, we managed to discover four confirmed supernovae within the first three days and more discoveries are still being made. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150327-1400.html -- 4.4 Кб -- 10.04.2016
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2009. http://www.mso.anu.edu.au/seminars/abstracts/20150326-1100.html
Local galaxies are in a state of energy equipartition which means that the kinetic energy density equals roughly the thermal one and the magnetic one. ... In models of young galaxies magnetic fields are usually not considered as they are assumed not to be dynamical important at high redshifts. In the presence of turbulence, however, the turbulent dynamo can amplify weak magnetic seed fields by randomly stretching, twisting, and folding the field lines. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150326-1100.html -- 5.3 Кб -- 10.04.2016
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2010. http://www.mso.anu.edu.au/seminars/abstracts/20150324-1400.html
. The range of offshore 8m-class telescopes to which Australian astronomers have access is about to undergo significant changes. I will outline the extensive suite of facilities on the Gemini, Magellan, and Keck telescopes to which all Australian astronomers will be able to apply for from now through to the end of 2017. The International Telescopes Support Office at the AAO is positioning itself to support users of these facilities in a range of ways that I shall discuss.
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150324-1400.html -- 4.2 Кб -- 10.04.2016
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2011. http://www.mso.anu.edu.au/seminars/abstracts/20150320-1400.html
. The Gemini multi-conjugate adaptive optics system (GeMS) deploys five laser guide stars and up to three natural guide stars, for better-than-Hubble resolution of ~ 90 milli-arcseconds in Ks-band across the field of view of the RSAA-built Gemini South adaptive optics imager (GSAOI). I will present a user s view of observing with this complex instrument, and make recommendations for getting the most out of your GeMS/GSAOI data.
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150320-1400.html -- 4.1 Кб -- 10.04.2016
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2012. http://www.mso.anu.edu.au/seminars/abstracts/20150319-1100.html
Where did Edwin Hubble get his famous tuning fork from? Every astronomer studying galaxies uses Hubble types Sa, Sb, Sc; does anyone know the actual source of the Hubble classification bins ? ... Who secured almost all the spectra in Hubble s law v=Hr? Following years of collaboration and detective work together with KC Freeman, the strategy of Edwin Hubble is exposed and unmasked to the astronomical community. The seminar details conversations held with the late Dr Allan Sandage. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150319-1100.html -- 4.4 Кб -- 10.04.2016
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2013. http://www.mso.anu.edu.au/seminars/abstracts/20150318-1400.html
. Brian Boyle will give us an update on the Square Kilometre Array project, particularly the recently completed process of re-baselining and the implications for Australia.
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150318-1400.html -- 3.9 Кб -- 10.04.2016
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2014. http://www.mso.anu.edu.au/seminars/abstracts/20150313-1420.html
The strength of the CaII triplet lines near 8500Ang in low/medium resolution spectra of red giants have been used to measure overall abundance, characterised by [Fe/H], in many stellar systems. ... Ca II triplet line strength measurements of LMC red giants that have high dispersion measurements of both [Fe/H] and [Ca/Fe] are used to investigate this question, noting that the LMC stars have quite different [Ca/Fe] from the Galactic calibration objects (globular and open clusters). ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150313-1420.html -- 4.2 Кб -- 10.04.2016
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2015. http://www.mso.anu.edu.au/seminars/abstracts/20150313-1400.html
. Accurate flux calibration is required to derive to many intrinsic properties of the galaxy like star formation rate. It is also required to compare the data from different instruments. In this FoF I will summarise some of the issues (and hopefully their solutions) encountered while flux calibrating data from DEIMOS spectrograph on KECK.
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150313-1400.html -- 4.0 Кб -- 10.04.2016
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2016. http://www.mso.anu.edu.au/seminars/abstracts/20150312-1100.html
Interacting binary stars that produce fast and faint transients, thermonuclear and stripped core-collapse supernovae, or merging compact objects play a crucial role in many areas of astrophysics. ... To tackle the grand task of uncovering the origin of these objects, one must understand how close binary stars evolve and interact. I will demonstrate how such calculations have contributed to uncovering a formation channel of Type Ia supernovae that originates from merging white dwarf stars. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150312-1100.html -- 5.0 Кб -- 10.04.2016
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2017. http://www.mso.anu.edu.au/seminars/abstracts/20150306-1420.html
The next large instrument on a Gemini telescope, GHOST, is being built by a collaboration including AAO, ANU and NRC-Herzberg. It aims to be a high efficiency fiber fed Echelle spectrograph with a wide wavelength range. I will describe the designтАЩs background, including lenslet-based image slicing that reduces slit losses while maintaining high resolution, and why despite cost constraints, the spectrograph has several modes, including a precision radial velocity mode and a two object mode. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150306-1420.html -- 4.3 Кб -- 10.04.2016
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2018. http://www.mso.anu.edu.au/seminars/abstracts/20150306-1400.html
I will present here some of the work that I, my group and collaborators have done on understanding the heating and cooling of the nearest L* galaxy to our own, Andromeda. Its proximity means that we gain a high resolution picture of a typical galaxy unobtainable anywhere else except for the Milky Way, but being external, we can see the integrated picture at the same time, making comparisons with more distant surveys much easier. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150306-1400.html -- 4.3 Кб -- 10.04.2016
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2019. http://www.mso.anu.edu.au/seminars/abstracts/20150305-1100.html
The first natural guide star (NGS) and laser guide star (LGS) adaptive optics (AO) systems on 8 to 10 m class telescopes were implemented on the Keck II telescope in 1999 and 2004, respectively. Both Keck telescopes are now equipped with LGS AO systems and 558 refereed science papers have been published using data from these systems through 2014. ...
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150305-1100.html -- 4.2 Кб -- 10.04.2016
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2020. http://www.mso.anu.edu.au/seminars/abstracts/20150227-1430.html
. A raptor photonics EMCCD camera is characterised for noise, defects and dark current. A preliminary vibration analysis of a new beam expander for space debris tracking is conducted.
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Ссылки http://www.mso.anu.edu.au/seminars/abstracts/20150227-1430.html -- 3.9 Кб -- 10.04.2016
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