College of Science

SEMINAR: Henry (Chip) Kobulnicky [University of Wyoming])

SEMINAR: New Measurements for Mass-loss Rates of Massive Stars, Dr. Henry (Chip) Kobulnicky [University of Wyoming]

Oct 10, 2019 11:00 AM to Oct 10, 2019 12:00 PM at

Physics and Astronomy Seminar

October 10, 2019 at Building 8, Room 241


Dr. Henry (Chip) Kobulnicky (University of Wyoming)


New Measurements for Mass-loss Rates of Massive Stars

Second only to initial mass, the rate of wind-driven mass loss determines the final mass of a massive star and the nature of its remnant.  The deaths of massive stars produce nature's most explosive events, like supernova and gamma-ray bursts, as well as the compact neutron stars and black holes that are now seen with gravitational wave observatories when they merge.  Motivated by the need to reconcile observational values and theory, we use a recently vetted technique to analyze the mass-loss rates in a sample of
massive stars that generate "bowshock nebulae" as they speed through the interstellar medium. The new mass-loss rates for these O and early B stars agree with recently lowered theoretical predictions, ranging from 10^-7 solar masses per year for mid-O dwarfs to 10^-9 solar masses per year for late-O dwarfs---a factor of about 2.7 lower than the canonical values.  Decreased mass-loss rates means that massive stars die with larger masses than previously assumed, with implications for the final nature of the stellar remnant.




10:50 am Refreshments

11:00 am Seminar