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Stellar Population Diagnostics of the Massive Star Binary Fraction
Trevor Z. Dorn-Wallenstein, Emily M. Levesque
Populations of massive stars are directly reflective of the physics of stellar evolution. Counting subtypes of massive stars and ratios of massive stars in different evolutionary s…
Red Supergiants in the JWST Era. I: Near-IR Photometric Diagnostics
Emily M. Levesque
The Near Infrared Camera (NIRCam) on the James Webb Space Telescope (JWST) will be an incredibly powerful instrument for studying red supergiants (RSGs). The high luminosities and…
A Runaway Giant in the Galactic Halo
Philip Massey, Stephen E. Levine, Kathryn F. Neugent +3
New evidence provided by the Gaia satellite places the location of the runaway star J01020100-7122208 in the halo of the Milky Way (MW) rather than in the Small Magellanic Cloud as…
Binary Red Supergiants: A New Method for Detecting B-type Companions
Kathryn F. Neugent, Emily M. Levesque, Phil Massey
With the exception of a few well-known and studied systems, the binary population of red supergiants (RSGs) remains relatively uncharacterized. Famous systems such as VV Cep, 31 Cy…
Physical Properties of II Zw 40's Super Star Cluster and Nebula: New Insights and Puzzles from UV Spectroscopy
Claus Leitherer, Nell Byler, Janice C. Lee +1
We analyze far-ultraviolet spectra and ancillary data of the super star cluster SSC-N and its surrounding H II region in the nearby dwarf galaxy II Zw 40. From the ultraviolet spec…
Stellar and nebular diagnostics in the UV for star-forming galaxies
Nell Byler, Julianne Dalcanton, Charlie Conroy +4
There is a long history of using optical emission and absorption lines to constrain the metallicity and ionization parameters of gas in galaxies. However, comparable diagnostics ar…