Search Results - "Casey, Andrew"

THE BEST AND BRIGHTEST METAL-POOR STARS by SCHLAUFMAN, KEVIN C, Casey, Andrew R

“…The chemical abundances of large samples of extremely metal-poor (EMP) stars can be used to investigate metal-free stellar populations, supernovae, and…”
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An Ultra Metal-poor Star Near the Hydrogen-burning Limit by Schlaufman, Kevin C., Thompson, Ian B., Casey, Andrew R.

“…Abstract It is unknown whether or not low-mass stars can form at low metallicity. While theoretical simulations of Population III (Pop III) star formation show…”
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CHEMISTRY OF THE MOST METAL-POOR STARS IN THE BULGE AND THE z ≳ 10 UNIVERSE by Casey, Andrew R, Schlaufman, Kevin C

“…Metal-poor stars in the Milky Way are local relics of the epoch of the first stars and the first galaxies. However, a low metallicity does not prove that a…”
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Snake in the Clouds: a new nearby dwarf galaxy in the Magellanic bridge by Koposov, Sergey E, Walker, Matthew G, Belokurov, Vasily, Casey, Andrew R, Geringer-Sameth, Alex, Mackey, Dougal, Da Costa, Gary, Erkal, Denis, Jethwa, Prashin, Mateo, Mario, Olszewski, Edward W, Bailey, John I

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Korg: Fitting, Model Atmosphere Interpolation, and Brackett Lines by Wheeler, Adam J., Casey, Andrew R., Abruzzo, Matthew W.

“…Abstract We describe several updates to Korg , a package for 1D LTE spectral synthesis of FGKM stars. Built-in functions to fit observed spectra via synthesis…”
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The RAVE-on Catalog of Stellar Atmospheric Parameters and Chemical Abundances for Chemo-dynamic Studies in the Gaia Era by Casey, Andrew R., Hawkins, Keith, Hogg, David W., Ness, Melissa, Rix, Hans-Walter, Kordopatis, Georges, Kunder, Andrea, Steinmetz, Matthias, Koposov, Sergey, Enke, Harry, Sanders, Jason, Gilmore, Gerry, Zwitter, Tomaž, Freeman, Kenneth C., Casagrande, Luca, Matijevič, Gal, Seabroke, George, Bienaymé, Olivier, Bland-Hawthorn, Joss, Gibson, Brad K., Grebel, Eva K., Helmi, Amina, Munari, Ulisse, Navarro, Julio F., Reid, Warren, Siebert, Arnaud, Wyse, Rosemary

“…The orbits, atmospheric parameters, chemical abundances, and ages of individual stars in the Milky Way provide the most comprehensive illustration of galaxy…”
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Iron-rich Metal-poor Stars and the Astrophysics of Thermonuclear Events Observationally Classified as Type Ia Supernovae. I. Establishing the Connection by Reggiani, Henrique, Schlaufman, Kevin C., Casey, Andrew R.

“…Abstract The progenitor systems and explosion mechanisms responsible for the thermonuclear events observationally classified as Type Ia supernovae are…”
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Dynamically Tagged Groups of Metal-poor Stars from the Best and Brightest Survey by Shank, Derek, Beers, Timothy C., Placco, Vinicius M., Limberg, Guilherme, Jaques, Emma, Yuan, Zhen, Schlaufman, Kevin C., Casey, Andrew R., Huang, Yang, Lee, Young Sun, Hattori, Kohei, Santucci, Rafael M.

“…Abstract Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ∼4000 metal-poor stars ([Fe/H] ≤ −0.8) compiled…”
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DERIVING STELLAR EFFECTIVE TEMPERATURES OF METAL-POOR STARS WITH THE EXCITATION POTENTIAL METHOD by FREBEL, ANNA, Casey, Andrew R, Jacobson, Heather R, YU, QINSI

“…It is well established that stellar effective temperatures determined from photometry and spectroscopy yield systematically different results. We describe a…”
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Tidal Interactions between Binary Stars Can Drive Lithium Production in Low-mass Red Giants by Casey, Andrew R., Ho, Anna Y. Q., Ness, Melissa, Hogg, David W., Rix, Hans-Walter, Angelou, George C., Hekker, Saskia, Tout, Christopher A., Lattanzio, John C., Karakas, Amanda I., Woods, Tyrone E., Price-Whelan, Adrian M., Schlaufman, Kevin C.

“…Theoretical models of stellar evolution predict that most of the lithium inside a star is destroyed as the star becomes a red giant. However, observations…”
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Stellar spots cause measurable variations in atmospheric metallicity by Wilson, Tanner A, Casey, Andrew R

“…ABSTRACT To accurately measure a star’s atmospheric parameters and chemical abundances, it is crucial to have high-quality spectra. Analysing the detailed…”
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The TESS–HERMES survey data release 1: high-resolution spectroscopy of the TESS southern continuous viewing zone by Sharma, Sanjib, Stello, Dennis, Buder, Sven, Kos, Janez, Bland-Hawthorn, Joss, Asplund, Martin, Duong, Ly, Lin, Jane, Lind, Karin, Ness, Melissa, Huber, Daniel, Zwitter, Tomaz, Traven, Gregor, Hon, Marc, Kafle, Prajwal R., Khanna, Shourya, Saddon, Hafiz, Anguiano, Borja, Casey, Andrew R., Freeman, Ken, Martell, Sarah, De Silva, Gayandhi M., Simpson, Jeffrey D., Wittenmyer, Rob A., Zucker, Daniel B.

“…Abstract The Transiting Exoplanet Survey Satellite (TESS) will provide high-precision time series photometry for millions of stars with at least a half-hour…”
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The GALAH survey and Gaia DR2: dissecting the stellar disc’s phase space by age, action, chemistry, and location by Bland-Hawthorn, Joss, Sharma, Sanjib, Tepper-Garcia, Thor, Binney, James, Freeman, Ken C, Hayden, Michael R, Kos, Janez, De Silva, Gayandhi M, Ellis, Simon, Lewis, Geraint F, Asplund, Martin, Buder, Sven, Casey, Andrew R, D’Orazi, Valentina, Duong, Ly, Khanna, Shourya, Lin, Jane, Lind, Karin, Martell, Sarah L, Ness, Melissa K, Simpson, Jeffrey D, Zucker, Daniel B, Zwitter, Tomaž, Kafle, Prajwal R, Quillen, Alice C, Ting, Yuan-Sen, Wyse, Rosemary F G

“…Abstract We use the second data releases of the European Space AgencyGaia astrometric survey and the high-resolution Galactic Archaeology with HERMES (GALAH)…”
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The impact of incorrect dissociation energies on inferred photospheric abundances by Aquilina, Sarah E, Casey, Andrew R, Wheeler, Adam J

“…ABSTRACT Spectral synthesis codes are essential for inferring stellar parameters and detailed chemical abundances. These codes require many physical inputs to…”
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The GALAH survey: effective temperature calibration from the InfraRed Flux Method in the Gaia system by Casagrande, Luca, Lin, Jane, Rains, Adam D, Liu, Fan, Buder, Sven, Horner, Jonathan, Asplund, Martin, Lewis, Geraint F, Martell, Sarah L, Nordlander, Thomas, Stello, Dennis, Ting, Yuan-Sen, Wittenmyer, Robert A, Bland-Hawthorn, Joss, Casey, Andrew R, De Silva, Gayandhi M, D’Orazi, Valentina, Freeman, Ken C, Hayden, Michael R, Kos, Janez, Lind, Karin, Schlesinger, Katharine J, Sharma, Sanjib, Simpson, Jeffrey D, Zucker, Daniel B, Zwitter, Tomaž

“…ABSTRACT In order to accurately determine stellar properties, knowledge of the effective temperature of stars is vital. We implement Gaia and 2MASS photometry…”
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Korg: A Modern 1D LTE Spectral Synthesis Package by Wheeler, Adam J., Abruzzo, Matthew W., Casey, Andrew R., Ness, Melissa K.

“…Abstract We present Korg , a new package for 1D LTE spectral synthesis of FGK stars, which computes theoretical spectra from the near-ultraviolet to the…”
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The tidal remnant of an unusually metal-poor globular cluster by Wan, Zhen, Lewis, Geraint F., Li, Ting S., Simpson, Jeffrey D., Martell, Sarah L., Zucker, Daniel B., Mould, Jeremy R., Erkal, Denis, Pace, Andrew B., Mackey, Dougal, Ji, Alexander P., Koposov, Sergey E., Kuehn, Kyler, Shipp, Nora, Balbinot, Eduardo, Bland-Hawthorn, Joss, Casey, Andrew R., Da Costa, Gary S., Kafle, Prajwal, Sharma, Sanjib, De Silva, Gayandhi M.

“…Globular clusters are some of the oldest bound stellar structures observed in the Universe 1 . They are ubiquitous in large galaxies and are believed to trace…”
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A hyper-runaway white dwarf in Gaia DR2 as a Type Iax supernova primary remnant candidate by Ruffini, Nicholas J, Casey, Andrew R

“…ABSTRACT Observations of stellar remnants linked to Type Ia and Type Iax supernovae are necessary to fully understand their progenitors. Multiple progenitor…”
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The GALAH Survey: second data release by Buder, Sven, Asplund, Martin, Duong, Ly, Kos, Janez, Lind, Karin, Ness, Melissa K, Sharma, Sanjib, Bland-Hawthorn, Joss, Casey, Andrew R, De Silva, Gayandhi M, D’Orazi, Valentina, Freeman, Ken C, Lewis, Geraint F, Lin, Jane, Martell, Sarah L, Schlesinger, Katharine J, Simpson, Jeffrey D, Zucker, Daniel B, Zwitter, Tomaž, Amarsi, Anish M, Anguiano, Borja, Carollo, Daniela, Casagrande, Luca, Čotar, Klemen, Cottrell, Peter L, Da Costa, Gary, Gao, Xudong D, Hayden, Michael R, Horner, Jonathan, Ireland, Michael J, Kafle, Prajwal R, Munari, Ulisse, Nataf, David M, Nordlander, Thomas, Stello, Dennis, Ting (丁源森), Yuan-Sen, Traven, Gregor, Watson, Fred, Wittenmyer, Robert A, Wyse, Rosemary F G, Yong, David, Zinn, Joel C, Žerjal, Maruša

“…ABSTRACT The Galactic Archaeology with HERMES (GALAH) survey is a large-scale stellar spectroscopic survey of the Milky Way, designed to deliver complementary…”
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OBSERVATIONAL CONSTRAINTS ON FIRST-STAR NUCLEOSYNTHESIS. II. SPECTROSCOPY OF AN ULTRA METAL-POOR CEMP-no STAR by Placco, Vinicius M., Frebel, Anna, Beers, Timothy C., Yoon, Jinmi, Chiti, Anirudh, Heger, Alexander, Chan, Conrad, Casey, Andrew R., Christlieb, Norbert

“…ABSTRACT We report on the first high-resolution spectroscopic analysis of HE 0020–1741 , a bright ( V  = 12.9), ultra metal-poor ( = −4.1), carbon-enhanced ( =…”
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