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Past events
List of past events.
Colloquium: Courtney Crawford (University of Sydney) "Hydrogen Deficient Carbon Stars - What happens after a white dwarf merger?" ...
Hydrogen deficient carbon (HdC) stars are a rare class of supergiant variable star with less than 1% hydrogen by mass. They exhibit a wealth of exotic characteristics such as production of dust, carbon-rich atmospheres, anomalous isotopic ratios, and very low metallicities. The most likely explanation for their formation is via a low-mass white dwarf merger, namely a CO-WD + He-WD merger. In this talk I will present the evidence that we see for this exotic formation mechanism, such as the oxygen isotopic ratio, our efforts in stellar modelling, and population synthesis modelling. I will also provide an overview of their unique characteristics and pathways for current work on them, especially regarding dust production, variability, and our current understanding of their kinematics using Gaia data.
RSAA Colloquium - Dr Rhea Silvia Remus (Universitäts-Sternwarte München) »
Title: TBC
Colloquium: Joss Bland-Hawthorn (U. Sydney) "Do baryons dominate the centres of high-redshift galaxies?" »
NFW would have us believe that dark matter dominates the centres of galaxies, but this has never been observed in massive galaxies, and certainly not in the Milky Way and M31 where baryons dominate out to at least 10 kpc in radius. So what about early galaxies? Can we find NFW cusps here that were subsequently wiped out? This is looking increasingly unlikely as well -- baryons may have always dominated the inner parts of galaxies. I will examine implications of baryon domination that will be testable with JWST deep fields (e.g. JADES) in the coming months.
RSAA Colloquium - Professor Joss Bland-Hawthorn »
Title: Do baryons dominate the centres of high-redshift galaxies?
RSAA-CGA Joint Seminar - Andjelka Kovačević »
"Unraveling close binary supermassive black holes: Interplay of time-domain observations and simulations"
RSAA Colloquium - Professor Kinwah Wu (University College London) »
Details provided shortly.
End of Thesis talk - Zefeng Li (RSAA) »
Title: Metallicity correlations in galaxies
RSAA Seminar - A/Prof. Shunsaku Horiuchi (Virginia Tech) »
Towards the discovery of diffuse supernova neutrinos.
