Two Lectures on 2016-06-21

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Peter Jedicke
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Two Lectures on 2016-06-21

Post by Peter Jedicke » June 10th, 2016, 12:36 am

Western Events Calendar: http://www.events.westernu.ca/events/ph ... n-the.html
At Western University, Tuesday 2016-06-21 at 10:30 in the Physics & Astronomy Seminar Room 100, there will be a lecture by

Dr. Jason Nordhaus
of the School of Mathematical Sciences, Rochester Institute of Technology
on the topic
“Binary interactions on the post-main sequence”

The physics of post-main-sequence binaries is rich with open theoretical questions. Planetary and stellar companions orbiting within ~5 AU of their host stars may strongly interact as the primary star evolves off the main sequence. In this talk, a few of the physical processes that can occur when the companion becomes engulfed in a common envelope (CE) will be highlighted. In particular, the amplification of magnetic fields during the CE, where to look for planetary companions around white dwarfs and the formation and shaping of planetary nebulae. For the last 10 minutes of this talk, work building astronomy opportunities for deaf and hard-of-hearing students at the National Technical Institute for the Deaf at RIT will be presented.

Coffee will be available in the Atrium, 2nd floor, at 10:00 a.m.

The second lecture is at 13:00 in the same room, by
Neven Vulic
It's Neven's PhD Public Lecture. Neven has worked with supervisors Pauline Barmby and Sarah Gallagher. His title is
X-ray Populations in the Local Group: Insights with Hubble & Chandra

X-ray observations provide a unique perspective on the most energetic processes in the Universe. In particular, Low-mass X-ray binaries (LMXBs) found in globular clusters have been shown to depend on the mass, radius, and metallicity of the cluster. This thesis focuses on the impact environmental parameters have on X-ray sources and the underlying physical explanations for them.

Neven studied the X-ray binary population in M31 using data from Chandra and Hubble. From a sample of 83 star clusters, he found the brightest and most compact star clusters preferentially hosted an X-ray source. An investigation of 1566 HII regions found that neither radius nor H-alpha luminosity was a predictor of an HII region hosting an X-ray source. Following-up this work, Neven produced the most sensitive Chandra X-ray point source catalogue of M31. The X-ray luminosity functions indicated a lack of bright high-mass X-ray binaries in the disk and an aging population of LMXBs in the bulge.

Neven also investigated the origin of the relationship between globular cluster metallicity and LMXB formation by studying the number density of red giant branch stars for 109 Galactic globular clusters. A Spearman Rank test confirmed that the red giant branch star density was correlated with metallicity [Fe/H].
Peter Jedicke, FRASC
London Centre Honorary President (1996-)

"Much is too strange to be believed, but nothing is too strange to have happened." (Thomas Hardy)

RobMcNeil
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Re: Two Lectures on 2016-06-21

Post by RobMcNeil » June 20th, 2016, 10:13 pm

I am looking forward to these tomorrow - thank you, Peter!

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Peter Jedicke
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Re: Two Lectures on 2016-06-21

Post by Peter Jedicke » June 22nd, 2016, 5:46 am

Both lectures were quite good. Pretty technical, but I was able to follow maybe a bit more than half of what was explained. Good to see you there, Rob!
Peter Jedicke, FRASC
London Centre Honorary President (1996-)

"Much is too strange to be believed, but nothing is too strange to have happened." (Thomas Hardy)

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