Calendar

Feb
19
Mon
PDS Atmospheres Node meeting
Feb 19 @ 3:00 pm – 4:00 pm
Feb
23
Fri
Colloquium Thesis Proposal: Jodi Berdis
Feb 23 @ 3:15 pm – 4:15 pm
Colloquium Thesis Proposal: Jodi Berdis @ BX102

Colloquium Title

Jodi Berdis, NMSU

Abstract text

Observatory Open House
Feb 23 @ 7:00 pm – 8:00 pm
Observatory Open House

Your hosts for the February Campus Observatory Open House are Moire Prescott, Agnar Hall, David DeColibus, and Kristen Luchsinger.

Feb
26
Mon
Planetary Group meeting
Feb 26 @ 3:00 pm – 4:00 pm
Mar
2
Fri
Colloquium PhD Thesis Defense: Gordon MacDonald
Mar 2 @ 3:15 pm – 4:15 pm
Colloquium PhD Thesis Defense: Gordon MacDonald @ BX102

Colloquium Title

Gordon MacDonald, NMSU

Abstract

Mar
5
Mon
PDS Atmospheres Node meeting
Mar 5 @ 3:00 pm – 4:00 pm
Mar
12
Mon
Planetary Group meeting
Mar 12 @ 3:00 pm – 4:00 pm
Mar
15
Thu
Colloquium Thesis Proposal: Drew Chojnowski
Mar 15 @ 3:15 pm – 4:15 pm
Colloquium Thesis Proposal: Drew Chojnowski @ Domenici Hall 102

The Circumstellar Disks and Binary Companions of Be Stars

Drew Chojnowski, NMSU

Tremendous progress has been made over the past two decades toward understanding Be stars, but a number of key aspects of them remain enigmatic. The unsolved mysteries include identification of the mechanism responsible for disk formation, the reason this mechanism occasionally turns off or on unexpectedly, the source of viscosity in the circumstellar disks, and the cause of slowly precessing density perturbations in the disks of many or most Be stars. On a deeper level, the origin of Be stars’ near-critical rotation is unknown, with one possible explanation being spin-up due to interaction with a binary companion. A better understanding of these stars is needed, with a particular focus on high-mass binaries being warranted in the age of gravitational wave astronomy. In this dissertation, I will extend the knowledge and understanding of Be stars through a series of three projects. First, I will present and describe the largest ever homogeneous, spectroscopic sample of Be stars to date. I will then focus on investigation of a rare class of Be stars found in binary systems with hot, low mass companions. The second project will present detailed characterization and modeling of HD~55606, a newly discovered member of this class. Finally, I will discuss the results of spectroscopic monitoring of seven newly discovered systems and establish or place limits on the orbital parameters of the binary components.

Mar
16
Fri
Observatory Open House
Mar 16 @ 9:00 pm – 10:00 pm
Observatory Open House

Your hosts for the March Campus Observatory Open House are Jon Holtzman, Ethan Dederick, Lauren Kahre, and Emma Dahl.

Mar
19
Mon
PDS Atmospheres Node meeting
Mar 19 @ 3:00 pm – 4:00 pm