Zobrazeno 1 - 10
of 287
pro vyhledávání: '"Martell, Sarah L."'
Autor:
Ong, J. M. Joel, Hon, Marc Teng Yen, Soares-Furtado, Melinda, Stephan, Alexander P., van Saders, Jennifer, Tayar, Jamie, Shappee, Benjamin, Hey, Daniel R., Cao, Lyra, Yıldız, Mutlu, Orhan, Zeynep Çelik, Örtel, Sibel, Montet, Benjamin, Holoien, Thomas W. -S., Bland-Hawthorn, Joss, Buder, Sven, De Silva, Gayandhi M., Freeman, Ken C., Martell, Sarah L., Lewis, Geraint F., Sharma, Sanjib, Stello, Dennis
We report the discovery and characterisation of TIC 350842552 ("Zvrk"), an apparently isolated, rapidly-rotating ($P_\text{rot} \sim 99\ \mathrm{d}$) red giant observed by TESS in its Southern Continuous Viewing Zone. The star's fast surface rotation
Externí odkaz:
http://arxiv.org/abs/2402.16971
Autor:
Bailey, Jeremy, Howarth, Ian D., Cotton, Daniel V., Kedziora-Chudczer, Lucyna, De Horta, Ain, Martell, Sarah L., Eldridge, Colin, Luckas, Paul
We present time-series linear-polarization observations of the bright O4 supergiant $\zeta$ Puppis. The star is found to show polarization variation on timescales of around an hour and longer. Many of the observations were obtained contemporaneously
Externí odkaz:
http://arxiv.org/abs/2402.13383
Autor:
Beeson, Kevin L., Kos, Janez, de Grijs, Richard, Martell, Sarah L., Bunder, Sven, Traven, Gregor, Lewis, Geraint F., Zafar, Tayyaba, Bland-Hawthorn, Joss, Freeman, Ken C., Hayden, Michael, Sharma, Sanjib, De Silva, Gayandhi M.
The ability to measure precise and accurate stellar effective temperatures ($T_{\rm{eff}}$) and surface gravities ($\log(g)$) is essential in determining accurate and precise abundances of chemical elements in stars. Measuring $\log(g)$ from isochron
Externí odkaz:
http://arxiv.org/abs/2402.07748
Autor:
Banks, Kirsten A., Martell, Sarah L., Tinney, C. G., Stello, Dennis, Hon, Marc, Reyes, Claudia, Priest, James, Buder, Sven, Montet, Benjamin T.
Although red clump stars function as reliable standard candles, their surface characteristics (i.e. $T_\text{eff}$, $\log g$, and [Fe/H]) overlap with those of red giant branch stars, which are not standard candles. Recent results have revealed that
Externí odkaz:
http://arxiv.org/abs/2401.13235
Autor:
Usman, Sam A., Ji, Alexander P., Li, Ting S., Pace, Andrew B., Cullinane, Lara R., Da Costa, Gary S., Koposov, Sergey E., Lewis, Geraint F., Zucker, Daniel B., Belokurov, Vasily, Bland-Hawthorn, Joss, Ferguson, Peter S., Hansen, Terese T., Limberg, Guilherme, Martell, Sarah L., McKenzie, Madeleine, Simon, Joshua D.
Milky Way globular clusters (GCs) display chemical enrichment in a phenomenon called multiple stellar populations (MSPs). While the enrichment mechanism is not fully understood, there is a correlation between a cluster's mass and the fraction of enri
Externí odkaz:
http://arxiv.org/abs/2401.02476
Autor:
Manea, Catherine, Hawkins, Keith, Ness, Melissa K., Buder, Sven, Martell, Sarah L., Zucker, Daniel B.
The observed chemical diversity of Milky Way stars places important constraints on Galactic chemical evolution and the mixing processes that operate within the interstellar medium. Recent works have found that the chemical diversity of disk stars is
Externí odkaz:
http://arxiv.org/abs/2310.15257
Autor:
Sayeed, Maryum, Ness, Melissa K., Montet, Benjamin T., Cantiello, Matteo, Casey, Andrew R., Buder, Sven, Bedell, Megan, Breivik, Katelyn, Metzger, Brian D., Martell, Sarah L., McGee-Gold, Leah
Stellar models predict that lithium (Li) inside a star is destroyed during the first dredge-up phase, yet 1.2% of red giant stars are Li-rich. We aim to uncover possible origins of this population, by analysing 1155 Li-rich giants (A(Li) $\geq$ 1.5)
Externí odkaz:
http://arxiv.org/abs/2306.03323
Autor:
Banks, Kirsten A., Ho, Chantel Y. Y., Martell, Sarah L., Buder, Sven, Stello, Dennis, Sharma, Sanjib, Priest, James, Gonneau, Anaïs, Hawkins, Keith
Data-driven analysis methods can help to infer physical properties of red giant stars where "gold-standard" asteroseismic data are not available. The study of optical and infrared spectra of red giant stars with data-driven analyses has revealed that
Externí odkaz:
http://arxiv.org/abs/2305.11620
Autor:
Schiavon, Ricardo P., Zamora, Olga, Carrera, Ricardo, Lucatello, Sara, Robin, A. C., Ness, Melissa, Martell, Sarah L., Smith, Verne V., García-Hernández, D. A., Manchado, Arturo, Schönrich, Ralph, Bastian, Nate, Chiappini, Cristina, Shetrone, Matthew, Mackereth, J. Ted, Williams, Rob A., Mészáros, Szabolcs, Allende Prieto, Carlos, Anders, Friedrich, Bizyaev, Dmitry, Beers, Timothy C., Chojnowski, S. Drew, Cunha, Katia, Epstein, Courtney, Frinchaboy, Peter M., García Pérez, Ana E., Hearty, Fred R., Holtzman, Jon A., Johnson, Jennifer A., Kinemuchi, Karen, Majewski, Steven R., Muna, Demitri, Nidever, David L., Nguyen, Duy Cuong, O'Connell, Robert W., Oravetz, Daniel, Pan, Kaike, Pinsonneault, Marc, Schneider, Donald P., Schultheis, Matthias, Simmons, Audrey, Skrutskie, Michael F., Sobeck, Jennifer, Wilson, John C., Zasowski, Gail
Formation of globular clusters (GCs), the Galactic bulge, or galaxy bulges in general is an important unsolved problem in Galactic astronomy. Homogeneous infrared observations of large samples of stars belonging to GCs and the Galactic bulge field ar
Externí odkaz:
http://hdl.handle.net/10150/623045
http://arizona.openrepository.com/arizona/handle/10150/623045
http://arizona.openrepository.com/arizona/handle/10150/623045
Autor:
Vogrinčič, Rok, Kos, Janez, Zwitter, Tomaž, Traven, Gregor, Beeson, Kevin L., Čotar, Klemen, Munari, Ulisse, Buder, Sven, Martell, Sarah L., Lewis, Geraint F., De Silva, Gayandhi M, Hayden, Michael R., Bland-Hawthorn, Joss, D'Orazi, Valentina
We use more than 872,000 mid-to-high resolution (R $\sim$ 20,000) spectra of stars from the GALAH survey to discern the spectra of diffuse interstellar bands (DIBs). We use four windows with the wavelength range from 4718 to 4903, 5649 to 5873, 6481
Externí odkaz:
http://arxiv.org/abs/2303.14016