Zobrazeno 1 - 10
of 15
pro vyhledávání: '"Hayes, Christian R."'
Autor:
Sit, Tawny, Weinberg, David H., Wheeler, Adam, Hayes, Christian R., Hasselquist, Sten, Masseron, Thomas, Sobeck, Jennifer
Stellar abundance measurements are subject to systematic errors that induce extra scatter and artificial correlations in elemental abundance patterns. We derive empirical calibration offsets to remove systematic trends with surface gravity $\log(g)$
Externí odkaz:
http://arxiv.org/abs/2403.08067
Autor:
Placco, Vinicius M., Almeida-Fernandes, Felipe, Holmbeck, Erika M., Roederer, Ian U., Mardini, Mohammad K., Hayes, Christian R., Venn, Kim, Chiboucas, Kristin, Deibert, Emily, Gamen, Roberto, Heo, Jeong-Eun, Jeong, Miji, Kalari, Venu, Martioli, Eder, Xu, Siyi, Diaz, Ruben, Gomez-Jimenez, Manuel, Henderson, David, Prado, Pablo, Quiroz, Carlos, Ruiz-Carmona, Roque, Simpson, Chris, Urrutia, Cristian, McConnachie, Alan W., Pazder, John, Burley, Gregory, Ireland, Michael, Waller, Fletcher, Berg, Trystyn A. M., Robertson, J. Gordon, Hartman, Zachary, Jones, David O., Labrie, Kathleen, Perez, Gabriel, Ridgway, Susan, Thomas-Osip, Joanna
We report on the chemo-dynamical analysis of SPLUS J142445.34-254247.1, an extremely metal-poor halo star enhanced in elements formed by the rapid neutron-capture process. This star was first selected as a metal-poor candidate from its narrow-band S-
Externí odkaz:
http://arxiv.org/abs/2310.17024
Autor:
Dovgal, Anya, Venn, Kim A., Sestito, Federico, Hayes, Christian R., McConnachie, Alan W., Navarro, Julio F., Placco, Vinicius M., Starkenburg, Else, Martin, Nicolas F., Pazder, John S., Chiboucas, Kristin, Deibert, Emily, Gamen, Roberto, Heo, Jeong-Eun, Kalari, Venu M., Martioli, Eder, Xu, Siyi, Diaz, Ruben, Gomez-Jiminez, Manuel, Henderson, David, Prado, Pablo, Quiroz, Carlos, Robertson, J. Gordon, Ruiz-Carmona, Roque, Simpson, Chris, Urrutia, Cristian, Waller, Fletcher, Berg, Trsytyn, Burley, Gregory, Hartman, Zachary, Ireland, Michael, Margheim, Steve, Perez, Gabriel, Thomas-Osip, Joanna
Publikováno v:
MNRAS 527 (2024) 7810-7824
Pristine_183.6849+04.8619 (P1836849) is an extremely metal-poor ([Fe/H]$=-3.3\pm0.1$) star on a prograde orbit confined to the Galactic disk. Such stars are rare and may have their origins in protogalactic fragments that formed the early Milky Way, i
Externí odkaz:
http://arxiv.org/abs/2310.03075
Autor:
Sestito, Federico, Hayes, Christian R., Venn, Kim A., Jensen, Jaclyn, McConnachie, Alan W., Pazder, John, Waller, Fletcher, Arentsen, Anke, Jablonka, Pascale, Martin, Nicolas F., Matsuno, Tadafumi, Navarro, Julio F., Starkenburg, Else, Vitali, Sara, Bassett, John, Berg, Trystyn A. M., Diaz, Ruben, Edgar, Michael L., Firpo, Veronica, Gomez-Jimenez, Manuel, Kalari, Venu, Lambert, Sam, Lawrence, Jon, Robertson, Gordon, Ruiz-Carmona, Roque, Salinas, Ricardo, Sebo, Kim M., Venkatesan, Sudharshan
This study focuses on Pristine$\_180956.78$$-$$294759.8$ (hereafter P180956, $[Fe/H] =-1.95\pm0.02$), a star selected from the Pristine Inner Galaxy Survey (PIGS), and followed-up with the recently commissioned Gemini High-resolution Optical SpecTrog
Externí odkaz:
http://arxiv.org/abs/2308.07366
Autor:
McCormick, Caroline, Majewski, Steven R., Smith, Verne V., Hayes, Christian R., Cunha, Katia, Masseron, Thomas, Weiss, Achim, Shetrone, Matthew, Almeida, Andrés, Frinchaboy, Peter M., García-Hernández, Domingo Aníbal, Nitschelm, Christian
Standard stellar evolution theory poorly predicts the surface abundances of chemical species in low-mass, red giant branch (RGB) stars. Observations show an enhancement of p-p chain and CNO cycle products in red giant envelopes, which suggests the ex
Externí odkaz:
http://arxiv.org/abs/2307.11191
Autor:
Brauner, Maren, Masseron, Thomas, García-Hernández, D. A., Pignatari, Marco, Womack, Kate A., Lugaro, Maria, Hayes, Christian R.
Publikováno v:
A&A 673, A123 (2023)
The origin of phosphorus, one of the essential elements for life on Earth, is currently unknown. Prevalent models of Galactic chemical evolution (GCE) underestimate the amount of P compared to observations. The recently discovered P-rich ([P/Fe] > 1
Externí odkaz:
http://arxiv.org/abs/2303.12590
Autor:
Hayes, Christian R., Masseron, Thomas, Sobeck, Jennifer, Garcia-Hernandez, D. A., Prieto, Carlos Allende, Beaton, Rachael L., Cunha, Katia, Hasselquist, Sten, Holtzman, Jon A., Jonsson, Henrik, Majewski, Steven R., Shetrone, Matthew, Smith, Verne V., Almeida, Andres
Elements with weak and blended spectral features in stellar spectra are challenging to measure and require specialized analysis methods to precisely measure their chemical abundances. In this work, we have created a catalog of approximately 120,000 g
Externí odkaz:
http://arxiv.org/abs/2208.00071
Autor:
Bonidie, Victoria, Court, Travis, Daher, Christine Mazzola, Fielder, Catherine E., Badenes, Carles, Newman, Jeffrey, Moe, Maxwell, Kratter, Kaitlin M., Walker, Matthew G., Majewski, Steven R., Hayes, Christian R., Hasselquist, Sten, Stassun, Keivan, Kounkel, Marina, Dixon, Don, Stringfellow, Guy S., Carlberg, Joleen, Anguiano, Borja, De Lee, Nathan, Troup, Nicholas
We use time-resolved spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) to examine the distribution of radial velocity (RV) variations in 249 stars identified as members of the Sagittarius (Sgr) dwarf spheroidal (dSph) g
Externí odkaz:
http://arxiv.org/abs/2204.09750
Autor:
Wilson, Robert F., Cañas, Caleb I., Majewski, Steven R., Cunha, Katia, Smith, Verne V., Bender, Chad F., Mahadevan, Suvrath, Fleming, Scott W., Teske, Johanna, Ghezzi, Luan, Jönsson, Henrik, Beaton, Rachael L., Hasselquist, Sten, Stassun, Keivan, Nitschelm, Christian, García-Hernández, D. A., Hayes, Christian R., Tayar, Jamie
The chemical abundances of planet-hosting stars offer a glimpse into the composition of planet-forming environments. To further understand this connection, we make the first ever measurement of the correlation between planet occurrence and chemical a
Externí odkaz:
http://arxiv.org/abs/2111.01753
Autor:
Beaton, Rachael L., Oelkers, Ryan J., Hayes, Christian R., Covey, Kevin R., Chojnowski, S. D., De Lee, Nathan, Sobeck, Jennifer S., Majewski, Steven R., Cohen, Roger, Fernandez-Trincado, Jose, Longa-Pena, Penelope, O'Connell, Julia E., Santana, Felipe A., Stringfellow, Guy S., Zasowski, Gail, Aerts, Conny, Anguiano, Borja, Bender, Chad, Canas, Caleb I., Cunha, Katia, Fleming, John Donor Scott W., Frinchaboy, Peter M., Feuillet, Diane, Harding, Paul, Hasselquist, Sten, Holtzman, Jon, Johnson, Jennifer A., Kollmeier, Juna A., Kounkel, Marina, Mahadevan, Suvrath, Price-Whelan, Adrian. M., Rojas-Arriagada, Alvaro, Roman-Zuniga, Carlos, Schlafly, Edward F., Schultheis, Mathias, Shetrone, Matthew, Simon, Joshua D., Stassun, Keivan G., Stutz, Amelia M., Tayar, Jamie, Teske, Johanna, Tkachenko, Andrew, Troup, Nick, Albareti, Franco D., Bizyaev, Dmitry, Bovy, Jo, Burgasser, Adam J., Comparat, Johan, Downes, Juan Jose, Geisler, Doug, Inno, Laura, Manchado, Arturo, Ness, Melissa K., Pinsonneault, Marc H., Prada, Francisco, Roman-Lopes, Alexandre, Simonian, Gregory V. A., Smith, Verne V., Yan, Renbin, Zamora, Olga
APOGEE-2 is a dual-hemisphere, near-infrared (NIR), spectroscopic survey with the goal of producing a chemo-dynamical mapping of the Milky Way Galaxy. The targeting for APOGEE-2 is complex and has evolved with time. In this paper, we present the upda
Externí odkaz:
http://arxiv.org/abs/2108.11907