General Information
CDSA is a 10-week program. In 2022 it will run from Tuesday, May 31 through Thursday, August 4. Given the strong integration of lectures, group activities, and tutorials, we require all students to be on campus ready to learn by the first day of the program. Early arrivals are possible.
Students participating in this NSF-funded program will receive a stipend of $6000 plus expenses for travel to and from Raleigh and on-campus housing during the 10-week program. Additional funding may be available for students to present their research at a relevant scientific conference after their summer residency.


 
					 The gravitational accretion onto a star moving through uniform 
interstellar gas was first described by Hoyle and Lyttleton in 1939.  
This description of accretion flow assumes smooth, laminar flow and
predicts identically zero accreted angular momentum.
HLA theory continues to be used in many fields of astrophysics, 
including a new class of accreting neutron stars now known as Supergiant
Fast X-Ray Transients.
The gravitational accretion onto a star moving through uniform 
interstellar gas was first described by Hoyle and Lyttleton in 1939.  
This description of accretion flow assumes smooth, laminar flow and
predicts identically zero accreted angular momentum.
HLA theory continues to be used in many fields of astrophysics, 
including a new class of accreting neutron stars now known as Supergiant
Fast X-Ray Transients.  
					 Chris used 2D hydrodynamic 
simulations to show that the accretion flow does not behave as described in this original theory, but instead
occurs through a rotating accretion disk.  As a consequence, the accreting star can be spun up to short
rotation periods.
Chris used 2D hydrodynamic 
simulations to show that the accretion flow does not behave as described in this original theory, but instead
occurs through a rotating accretion disk.  As a consequence, the accreting star can be spun up to short
rotation periods.