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Speaker: Dr. Katharine G. Johnston (University of Leeds)

Talk title: Properties of accretion discs around massive stars with ALMA

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"


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Thursday, October 24th, 2019
09.30-10.00: greeting of the visitor by the host
12.15–13.00: CSH Seminar
13.00–14.00: lunch
15.00–16.00: Beatrice Kulterer
17.30: departure by foot for the dinner restaurant
Friday, October 25th, 2019
10.30–12.00: TAPS Group Meeting -108 (G6)
12.00–13.00: lunch

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