Search Results - "Levesque, Emily M."

Stellar and Nebular Diagnostics in the Ultraviolet for Star-forming Galaxies by Byler, Nell, Dalcanton, Julianne J., Conroy, Charlie, Johnson, Benjamin D., Levesque, Emily M., Berg, Danielle A.

“…There is a long history of using optical emission and absorption lines to constrain the metallicity and ionization parameters of gas in galaxies. However,…”
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THE EFFECTS OF STELLAR ROTATION. I. IMPACT ON THE IONIZING SPECTRA AND INTEGRATED PROPERTIES OF STELLAR POPULATIONS by LEVESQUE, Emily M, LEITHERER, Claus, EKSTROM, Sylvia, MEYNET, Georges, SCHAERER, Daniel

“…We present a sample of synthetic massive stellar populations created using the Starburst99 evolutionary synthesis code and new sets of stellar evolutionary…”
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The Host Galaxies of Long-Duration Gamma-Ray Bursts by Levesque, Emily M.

“…Long-duration gamma-ray bursts (LGRBs) are the signatures of extraordinarily high-energy events occurring in our universe. Since their discovery, we have…”
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[Ne III]/[O II] AS AN IONIZATION PARAMETER DIAGNOSTIC IN STAR-FORMING GALAXIES by Levesque, Emily M, Richardson, Mark L A

“…We present our parameterizations of the log([NeIII][lambda]3869/[OII][lambda]3727) (Ne3O2) and log([OIII][lambda]5007/[OII][lambda]3727) (O3O2) ratios as…”
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Physical Properties of 5000 Cool Large Magellanic Cloud Supergiants with Gaia XP Spectra: A Detailed Portrait of the Upper H-R Diagram Hints at Missing Supernova Progenitors by Dorn-Wallenstein, Trevor Z., Neugent, Kathryn F., Levesque, Emily M.

“…Abstract Characterizing the physical properties of cool supergiants allows us to probe the final stages of a massive star’s evolution before it undergoes core…”
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Prospects for Multimessenger Observations of Thorne–Żytkow Objects by DeMarchi, Lindsay, Sanders, J. R., Levesque, Emily M.

“…Abstract Thorne–Żytkow objects (TŻOs) are a class of stellar object comprised of a neutron star core surrounded by a large and diffuse envelope. Their exterior…”
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The Luminosity Function of Red Supergiants in M31 by Neugent, Kathryn F., Massey, Philip, Georgy, Cyril, Drout, Maria R., Mommert, Michael, Levesque, Emily M., Meynet, Georges, Ekström, Sylvia

“…The mass-loss rates of red supergiant stars (RSGs) are poorly constrained by direct measurements, and yet the subsequent evolution of these stars depends…”
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The Effective Temperatures and Physical Properties of Magellanic Cloud Red Supergiants: The Effects of Metallicity by Levesque, Emily M, Massey, Philip, Olsen, K. A. G, Plez, Bertrand, Meynet, Georges, Maeder, Andre

“…We present moderate-resolution spectrophotometry of 36 red supergiants (RSGs) in the LMC and 37 RSGs in the SMC. Using the MARCS atmosphere models to fit this…”
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Great Dimming of Betelgeuse explained by Levesque, Emily M.

“…Observations suggest that an unexpected dimming of the massive star Betelgeuse resulted from dust forming over a cold patch in the star’s southern hemisphere…”
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Red Supergiants in the JWST Era. I. Near-IR Photometric Diagnostics by Levesque, Emily M.

“…The Near Infrared Camera (NIRCam) on the James Webb Space Telescope (JWST) will be an incredibly powerful instrument for studying red supergiants (RSGs). The…”
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Physical Properties of II Zw 40's Super Star Cluster and Nebula: New Insights and Puzzles from UV Spectroscopy by Leitherer, Claus, Byler, Nell, Lee, Janice C., Levesque, Emily M.

“…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…”
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A Comparison of Rotating and Binary Stellar Evolution Models: Effects on Massive Star Populations by Dorn-Wallenstein, Trevor Z., Levesque, Emily M.

“…Both rotation and interactions with binary companions can significantly affect massive star evolution, altering interior and surface abundances, mass loss…”
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The Red Supergiant Binary Fraction of the Large Magellanic Cloud by Neugent, Kathryn F., Levesque, Emily M., Massey, Philip, Morrell, Nidia I., Drout, Maria R.

“…The binary fraction of unevolved massive stars is thought to be 70%-100% but there are few observational constraints on the binary fraction of the evolved…”
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Stellar Population Diagnostics of the Massive Star Binary Fraction by Dorn-Wallenstein, Trevor Z., Levesque, Emily M.

“…Populations of massive stars are directly reflective of the physics of stellar evolution. Counts of subtypes of massive stars and ratios of massive stars in…”
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HV 11423: The Coolest Supergiant in the SMC by Massey, Philip, Levesque, Emily M, Olsen, K. A. G, Plez, Bertrand, Skiff, B. A

“…We call attention to the fact that one of the brightest red supergiants in the SMC has recently changed its spectral type from K0-1 I (2004 December) to M4 I…”
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MODELING TRACERS OF YOUNG STELLAR POPULATION AGE IN STAR-FORMING GALAXIES by Levesque, Emily M, Leitherer, Claus

“…The young stellar population of a star-forming galaxy is the primary engine driving its radiative properties. As a result, the age of a galaxy's youngest…”
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Binary Red Supergiants. II. Discovering and Characterizing B-type Companions by Neugent, Kathryn F., Levesque, Emily M., Massey, Philip, Morrell, Nidia I.

“…The percentage of massive main-sequence OB stars in binary systems is thought to be as high as 100%. However, very few Galactic binary red supergiants (RSGs)…”
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Testing Evolutionary Models with Red Supergiant and Wolf–Rayet Populations by Massey, Philip, Neugent, Kathryn F., Dorn-Wallenstein, Trevor Z., Eldridge, J. J., Stanway, E. R., Levesque, Emily M.

“…Abstract Despite the many successes that modern massive star evolutionary theory has enjoyed, reproducing the apparent trend in the relative number of red…”
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A Mote in Andromeda's Disk: A Misidentified Periodic AGN behind M31 by Dorn-Wallenstein, Trevor, Levesque, Emily M., Ruan, John J.

“…We identify an object previously thought to be a star in the disk of M31, J0045+41, as a background active galactic nucleus (AGN) seen through a low-absorption…”
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Short-term Variability of Evolved Massive Stars with TESS by Dorn-Wallenstein, Trevor Z., Levesque, Emily M., Davenport, James R. A.

“…We present the first results from a study of Transiting Exoplanet Survey Satellite (TESS) Sector 1 and 2 light curves for eight evolved massive stars in the…”
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