Zobrazeno 1 - 10
of 153
pro vyhledávání: '"De Silva, Gayandhi M"'
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:
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
First Asteroseismic Analysis of the Globular Cluster M80: Multiple Populations and Stellar Mass Loss
Asteroseismology provides a new avenue for accurately measuring the masses of evolved globular cluster (GC) stars through the detection of their solar-like oscillations. We present the first detections of solar-like oscillations in 47 red giant branc
Externí odkaz:
http://arxiv.org/abs/2307.07158
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
Mass loss remains a major uncertainty in stellar modelling. In low-mass stars, mass loss is most significant on the red giant branch (RGB), and will impact the star's evolutionary path and final stellar remnant. Directly measuring the mass difference
Externí odkaz:
http://arxiv.org/abs/2207.02406
Autor:
Hughes, Arvind C. N., Spitler, Lee R., Zucker, Daniel B., Nordlander, Thomas, Simpson, Jeffrey, Da Costa, Gary S., Ting, Yuan-Sen, Li, Chengyuan, Bland-Hawthorn, Joss, Buder, Sven, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Hayden, Michael R., Kos, Janez, Lewis, Geraint F., Lin, Jane, Lind, Karin, Martell, Sarah L., Schlesinger, Katharine J., Sharma, Sanjib, Zwitter, Tomaz, Collaboration, The GALAH
Extremely Metal-Poor (EMP) stars provide a valuable probe of early chemical enrichment in the Milky Way. Here we leverage a large sample of $\sim600,000$ high-resolution stellar spectra from the GALAH survey plus a machine learning algorithm to find
Externí odkaz:
http://arxiv.org/abs/2203.10843
Autor:
Clark, Jake T., Wright, Duncan J., Wittenmyer, Robert A., Horner, Jonathan, Hinkel, Natalie R., Clerté, Mathieu, Carter, Brad D., Buder, Sven, Hayden, Michael R., Bland-Hawthorn, Joss, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Kos, Janez, Lewis, Geraint F., Lin, Jane, Lind, Karin, Martell, Sarah L., Schlesinger, Katharine J., Sharma, Sanjib, Simpson, Jeffrey D., Stello, Dennis, Zucker, Daniel B., Zwitter, Tomaž, Munari, Ulisse, Nordlander, Thomas
Pioneering photometric, astrometric, and spectroscopic surveys are helping exoplanetary scientists better constrain the fundamental properties of stars within our galaxy, and the planets these stars host. In this study, we use the third data release
Externí odkaz:
http://arxiv.org/abs/2111.14883
Autor:
Li, Ting S., Ji, Alexander P., Pace, Andrew B., Erkal, Denis, Koposov, Sergey E., Shipp, Nora, Da Costa, Gary S., Cullinane, Lara R., Kuehn, Kyler, Lewis, Geraint F., Mackey, Dougal, Simpson, Jeffrey D., Zucker, Daniel B., Ferguson, Peter S., Martell, Sarah L., Bland-Hawthorn, Joss, Balbinot, Eduardo, Tavangar, Kiyan, Drlica-Wagner, Alex, De Silva, Gayandhi M., Simon, Joshua D., Collaboration, S5
We report the kinematic, orbital, and chemical properties of 12 stellar streams with no evident progenitors, using line-of-sight velocities and metallicities from the Southern Stellar Stream Spectroscopic Survey ($S^5$), proper motions from $Gaia$ ED
Externí odkaz:
http://arxiv.org/abs/2110.06950
Autor:
Buder, Sven, Lind, Karin, Ness, Melissa K., Feuillet, Diane K., Horta, Danny, Monty, Stephanie, Buck, Tobias, Nordlander, Thomas, Bland-Hawthorn, Joss, Casey, Andrew R., De Silva, Gayandhi M., D'Orazi, Valentina, Freeman, Ken C., Hayden, Michael R., Kos, Janez, Martell, Sarah L., Lewis, Geraint F., Lin, Jane, Schlesinger, Katharine. J., Sharma, Sanjib, Simpson, Jeffrey D., Stello, Dennis, Zucker, Daniel B., Zwitter, Tomaz, Ciuca, Ioana, Horner, Jonathan, Kobayashi, Chiaki, Ting, Yuan-Sen, Wyse, Rosemary F. G., Collaboration, The GALAH
Publikováno v:
MNRAS, 510, 2407 (2022)
Since the advent of $Gaia$ astrometry, it is possible to identify massive accreted systems within the Galaxy through their unique dynamical signatures. One such system, $Gaia$-Sausage-Enceladus (GSE), appears to be an early "building block" given its
Externí odkaz:
http://arxiv.org/abs/2109.04059