Zobrazeno 1 - 10
of 288
pro vyhledávání: '"Martell, Sarah L"'
Autor:
Awad, Petra, Li, Ting S., Erkal, Denis, Peletier, Reynier F., Bunte, Kerstin, Koposov, Sergey E., Li, Andrew, Balbinot, Eduardo, Smith, Rory, Canducci, Marco, Tino, Peter, Senkevich, Alexandra M., Cullinane, Lara R., Da Costa, Gary S., Ji, Alexander P., Kuehn, Kyler, Lewis, Geraint F., Pace, Andrew B., Zucker, Daniel B., Bland-Hawthorn, Joss, Limberg, Guilherme, Martell, Sarah L., McKenzie, Madeleine, Yang, Yong, Usman, Sam A.
As globular clusters (GCs) orbit the Milky Way, their stars are tidally stripped forming tidal tails that follow the orbit of the clusters around the Galaxy. The morphology of these tails is complex and shows correlations with the phase of the orbit
Externí odkaz:
http://arxiv.org/abs/2411.08991
Autor:
Atzberger, Kaia R., Usman, Sam A., Ji, Alexander P., Cullinane, Lara R., Erkal, Denis, Hansen, Terese T., Lewis, Geraint F., Li, Ting S., Limberg, Guilherme, Luna, Alice, Martell, Sarah L., McKenzie, Madeleine, Pace, Andrew B., Zucker, Daniel B.
Chemical abundances of stellar streams can be used to determine the nature of a stream's progenitor. Here we study the progenitor of the recently discovered Leiptr stellar stream, which was previously suggested to be a tidally disrupted halo globular
Externí odkaz:
http://arxiv.org/abs/2410.17312
Autor:
Das, Pradosh Barun, Zucker, Daniel B., De Silva, Gayandhi M., Borsato, Nicholas W., Mura-Guzmán, Aldo, Buder, Sven, Ness, Melissa, Nordlander, Thomas, Casey, Andrew R., Martell, Sarah L., Bland-Hawthorn, Joss, de Grijs, Richard, Freeman, Ken C., Kos, Janez, Stello, Dennis, Lewis, Geraint F., Hayden, Michael R., Sharma, Sanjib
Analysing stellar parameters and abundances from nearly one million Gaia DR3 Radial Velocity Spectrometer (RVS) spectra poses challenges due to the limited spectral coverage (restricted to the infrared Ca II triplet) and variable signal-to-noise rati
Externí odkaz:
http://arxiv.org/abs/2410.12272
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