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Upcoming Seminars
Listed here are presentations to be given at the
2008
- Does
omega Centauri have tidal tails?
Who: Gary Da
Costa (ANU)
Where: Geoff Opat Seminar Room 360, School of Physics
When: Fri 5 Sep 08 at 11:30am **NOTE UNUSUAL DAY AND TIME
Abstract: The results of a spectroscopic search with the AAT's 2dF multi-fibre spectrograph for candidate members of the unusual globular cluster Omega Centauri at and beyond the cluster tidal radius will be presented. Both radial velocity and line strength information is used to identify possible candidate members. The outcome is a limit on the fraction of the total cluster mass contained in the region between 1 and 2 cluster tidal radii, and will be discussed in the context of theories which postulate that Omega Centauri is the remnant nucleus of a tidally disrupted dwarf galaxy.
- The
complex and puzzling phenomenology of thermonuclear X-ray bursts
Who: Duncan
Galloway (
Where: Geoff Opat Seminar Room 360, School of Physics
When: 10 Sep 08 at 3:15pm
Abstract: Thirty years of observations of thermonuclear (type-I) bursts from accreting neutron stars have revealed a surprisingly rich spectrum of behavior. A few sources which have been studied intensively offer confirmed examples of the three classes of ignition predicted theoretically, and these systems serve as crucial test-cases for numerical models. However, the behavior of the majority of systems cannot be fully reconciled with theoretical predictions, suggesting there is additional physics at work. I will present recent results from analysis of the combined public observations made by the Rossi X- ray Timing Explorer (RXTE) over more than 10 years, totalling 1185 bursts from 48 sources. The two most prolific bursters in the sample exhibit distinctly different bursting properties, suggesting different accreted compositions in the accreted fuel, and highlighting the diversity in burst behaviour which must be considered when combining burst samples. I will also describe a successor project, the Multi-Instrument Burst ARchive (MINBAR), which aims to collate all bursts observed by modern instruments to enable comprehensive future studies of rare events and broad-scale behaviour. Finally, I will describe some of the approaches we are using to try to constrain the neutron star equation-of-state via thermonuclear burst measurements as part of these studies.
- Mass/luminosity
correlations for globular clusters and connections to events in galaxy
formation
Who: Bill
Harris (McMaster)
Where: Geoff Opat Seminar Room 360, School of Physics
When: 8 Oct 08 at 3:15pm
Abstract: TBA
- Title
TBA
Who: Charley
Lineweaver (ANU)
Where: Geoff Opat Seminar Room 360, School of Physics
When: 15 Oct 08 at 3:15pm
Abstract: TBA
- Title
TBA
Who: Ned Taylor
(
Where: Geoff Opat Seminar Room 360, School of Physics
When: 29 Oct 08 at 3:15pm
Abstract: TBA
- Title
TBA
Who: John Webb
(UNSW)
Where: Geoff Opat Seminar Room 360, School of Physics
When: 5 Nov 08 at 3:15pm
Abstract: TBA
- Title
TBA
Who: Ilana
Feain (ATNF)
Where: Geoff Opat Seminar Room 360, School of Physics
When: 19 Nov 08 at 3:15pm
Abstract: TBA
- Title
TBA
Who: Brian
Schmidt (ANU)
Where: Geoff Opat Seminar Room 360, School of Physics
When: 26 Nov 08 at 3:15pm
Abstract: TBA
- Title
TBA
Who: George
Hobbs (ATNF)
Where: Geoff Opat Seminar Room 360, School of Physics
When: 3 Dec 08 at 3:15pm
Abstract: TBA
Other astrophysics seminars and colloquia around Melbourne and Australia
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