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Center for Astrophysics Research and Technologies Seminar Series Information

 

Events Calendar

A Masing BAaDE's Window

Friday November 2, 2018
3:30 pm


 Presenter:  Dr. Ylva Pihlstrom, UNM, Physics and Astronomy
 Series:  Physics and Astronomy Colloquium
 Abstract:  Evolved, intermediate mass stars are tracers of an intermediate age stellar population.  Due to high mass-loss rates, they harbor circumstellar envelopes, in which different types of molecular maser emission can be observed.  The maser emission allows not only studies of the physical conditions in the circumstellar envelope itself, but also can be used to test Galactic dynamics.  Both these facets are investigated in the Bulge Asymmetries and Dynamical Evolution (BAaDE) survey, using 28,000 SiO maser emitting stars in the Milky Way galaxy observed by the VLA and ALMA. I will give an overview of this survey and discuss a few of our results and challenges: A marginal flux bias exists in our sample due to two different sets of frequencies observed, which could partly be corrected for using longer integration times at ALMA.  We have collected an extensive infrared data set for our sample, providing a means of modeling parameters such as bolometric luminosities and mass loss rates. Infrared colors further helps to separate C-rich from O-rich stars, and may also be tied to line ratios, tying back to the conditions in the circumstellar
envelope.
 Host:  Gregory Taylor
 Location:  Room 125, Dane Smith Hall
 

Refreshments will be available before the colloquium, at 03:15 pm, in in the lobby of Dane Smith Hall.

Disability Notice Individuals with disabilities who need an auxiliary aid or service to attend or participate in P&A events should contact Sandra Ortiz (phone: 505-277-5900, email: sportiz@unm.edu) well in advance to ensure your needs are accommodated. Event handouts can be provided in alternative accessible formats upon request. Please contact Ms. Ortiz if you need written information in an alternative format.