Visitor information
Speaker: Dr. Katharine G. Johnston (University of Leeds)
Website: https://physicalsciences.leeds.ac.uk/staff/441/dr-katharine-g-johnston
Talk title: Properties of accretion discs around massive stars with ALMA
Abstract:
Circumstellar discs are widely known to be one of the main conduits for accretion of matter onto forming low- and intermediate-mass stars, with their structural and kinematic properties being well-characterised by numerous studies. There is now significant evidence that centrifugally supported discs also exist around forming OB-type stars. However, a key question is how the physical and chemical properties of these discs compare to those around their lower-mass counterparts. In this seminar, I will begin with a brief review of the theoretical and observational background for the existence of discs around massive stars and their properties, including some of the recent results that ALMA has begun to provide in this field. I will then present results from our ALMA observations of AFGL 4176, a highly luminous (~10^5 Lsun) young stellar object, where transitions of CH3CN and 1.2mm dust continuum show a disc ~1000AU in radius, with signatures of Keplerian rotation and spiral structure around a 25Msun O-type star.
Office: G6, 105
Host: Dr. Maria Drozdovskaya (maria.drozdovskaya"at"csh.unibe.ch)
Schedule
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Please include your name, time, and the room, in which you would like to meet.
You may sign up for two consecutive slots if time allows.
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Thursday, October 24th, 2019 |
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09.30-10.00: greeting of the visitor by the host |
10.00–11.00: |
11.00–12.00: |
12.15–13.00: CSH Seminar |
13.00–14.00: lunch |
14.00–15:00: |
15.00–16.00: Beatrice Kulterer |
16.00–17.00: |
17.30: departure by foot for the dinner restaurant |
Friday, October 25th, 2019 |
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09.30–10.30: |
10.30–12.00: TAPS Group Meeting -108 (G6) |
12.00–13.00: lunch |
13.00–14.00: |
14.00–15:00: |
15.00–16.00: |
16.00–17.00: |
17.00–18.00: |
Dinner plans: Thursday, October 24th, 2019, 18:00 (Casa Novo, participants: Katharine, Beatrice, Susanne, Niels, Maria) - please contact the host if you would like to join the dinner