Circumstellar Dust Shells: Clues to the Evolution of R Coronae Borealis Stars

Date: 
Monday, August 20, 2018 - 2:00pm PDT
Speaker: 
Ed Montiel
Affiliation: 
UC Davis
Location: 
N232 R227
Event Type: 
Seminar

The study of extended, cold dust envelopes surrounding R Coronae Borealis (RCB) stars began with their discovery by IRAS. RCB stars are carbon-rich supergiants characterized by their extreme hydrogen deficiency and for their irregular and spectacular declines in brightness. I have examined new and archival Spitzer Space Telescope and Herschel Space Observatory images in the far infrared and submillimeter of these envelopes to examine the morphology of these dusty shells. These observations have been combined with other multiwavelength data, taken during maximum light, to construct spectral energy distributions, which have been analyzed by Monte Carlo radiative transfer. I have also investigated the hydrogen abundance of the envelope surrounding R Coronae Borealis, itself, with archival observations from the Galactic Arecibo L-band Feed Array HI (GALFA-HI) Survey. I will discuss all these results and their implications for the origins of the circumstellar material of RCB stars and the origins of RCB stars themselves.

Additional Information: 

To join remotely via WebEx use this link.

The call in number is: 1-844-467-4685
Participant Passcode: #: 711647

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