Levesque, Emily M., Kewley, Lisa J., Larson, Kirsten L.
We use the newest generation of the Starburst99/Mappings code to generate an extensive suite of models to facilitate detailed studies of star-forming galaxies and their ISM properties, particularly...
The Host Galaxies of Gamma-Ray Bursts I: ISM Properties of Ten Nearby Long-Duration GRB Hosts (2009)
Levesque, Emily M., Berger, Edo, Kewley, Lisa J., Bagley, Megan M.
We present the first observations from a large-scale survey of nearby (z < 1) long-duration gamma-ray burst (LGRB) host galaxies, which consist of eight rest-frame optical spectra obtained at Keck...
Red Supergiants in the Andromeda Galaxy (M31) (2009)
Massey, Philip, Silva, David R., Levesque, Emily M., Plez, Bertrand, Olsen, Knut A. G., Clayton, Geoffrey C., ...
Red supergiants are a short-lived stage in the evolution of moderately massive stars (10-25Mo), and as such their location in the H-R diagram provides an exacting test of stellar evolutionary models....
GRB 090426: The Environment of a Rest-Frame 0.35-second Gamma-Ray Burst at Redshift z=2.609 (2009)
Levesque, Emily M., Bloom, Joshua S., Butler, Nathaniel R., Perley, Daniel A., Cenko, S. Bradley, Prochaska, J. Xavier, ...
We present the discovery of an absorption-line redshift of z = 2.609 for GRB 090426, establishing the first firm lower limit to a redshift for a gamma-ray burst with an observed duration of 90%...
The Physical Properties of the Red Supergiant WOH G64: The Largest Star Known? (2009)
Levesque, Emily M., Massey, Philip, Plez, Bertrand, Olsen, Knut A. G.
WOH G64 is an unusual red supergiant (RSG) in the Large Magellanic Cloud (LMC), with a number of properties that set it apart from the rest of the LMC RSG population, including a thick circumstellar...
The Physical Properties of Red Supergiants (2009)
Red supergiants (RSGs) are a He-burning phase in the evolution of moderately massive stars (10-25 solar masses). For many years, the assumed physical properties of these stars placed them at odds...
The Physical Properties of Red Supergiants: Comparing Theory and Observations (2008)
Massey, Philip, Levesque, Emily M., Plez, Bertrand, Olsen, K. A. G.
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (than than 25 solar masses). For many years, their location in the H-R diagram was at variance with the...
Physical Properties of Red Supergiants (2007)
Massey, Philip, Plez, Bertrand, Levesque, Emily M., Olsen, K. A. G., Silva, David R., Clayton, Geoffery C.
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (
The Coolest Stars in the Clouds: Unusual Red Supergiants in the Magellanic Clouds (2007)
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand
Red supergiants (RSGs) are a He-burning phase in the evolution of moderately high mass stars (10-25 solar masses). The evolution of these stars, particularly at low metallicities, is still poorly...
The Host Galaxy of GRB 060505: Host ISM Properties (2007)
Levesque, Emily M., Kewley, Lisa J.
We investigate the ISM environment of GRB 060505. Using optical emission-line diagnostic ratios, we compare the ISM properties of the GRB 060505 host region with the hosts of unambiguous long- and...
Late-Type Red Supergiants: Too Cool for the Magellanic Clouds? (2007)
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand
We have identified seven red supergiants (RSGs) in the Large Magellanic Cloud (LMC) and four RSGs in the Small Magellanic Cloud (SMC), all of which have spectral types that are considerably later...
HV 11423: The Coolest Supergiant in the SMC (2007)
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 (December 2004) to M4 I (December 2005) and back to K0-1 I...
Oey, M. Sally, Meurer, Gerhardt R., Yelda, Sylvana, Furst, E. J., Caballero-Nieves, S. M., Hanish, D. J., ...
We use the first data release from the SINGG Hα survey of H I-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties...
Oey, M. Sally, Meurer, Gerhardt R., Yelda, Sylvana, Furst, E. J., Caballero-Nieves, S. M., Hanish, D. J., ...
We use the first data release from the SINGG Hα survey of H I-selected galaxies to study the quantitative behavior of the diffuse, warm ionized medium (WIM) across the range of properties...
Bringing VY Canis Majoris Down to Size: An Improved Determination of Its Effective Tempeature (2006)
Massey, Philip, Levesque, Emily M., Plez, Bertrand
The star VY CMa is a late-type M supergiant with many peculiarities, mostly related to the intense circumstellar environment due to the star's high mass-loss rate. Claims have been made that would...
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand, Meynet, George, Maeder, Andre
We use the MARCS stellar atmosphere to derive the physical properties of 36 red supergiants (RSGs) in the LMC, and 39 RSGs in the SMC using moderate-resolution optical spectrophotometry (4000-9000A)...
The Reddening of Red Supergiants: When Smoke Gets In Your Eyes (2005)
Massey, Philip, Plez, Bertrand, Levesque, Emily M., Olsen, K. A. G., Clayton, Geoffrey, Josselin, Eric
Deriving the physical properties of red supergiants (RSGs) depends upon accurate corrections for reddening by dust. We use our recent modeling of the optical spectra of RSGs to address this topic. We...
Levesque, Emily M., Massey, Philip, Olsen, K. A. G., Plez, Bertrand, Josselin, Eric, Maeder, Andre, ...
We use moderate-resolution optical spectrophotometry and the new MARCS stellar atmosphere models to determine the effective temperatures of 74 Galactic red supergiants. From these we find a new...