The Gasing Pangkah Collaboration. I. Asteroseismic Identification and Characterization of a Rapidly Rotating Engulfment Candidate

Autor: J. M. Joel Ong, Marc Teng Yen Hon, Melinda Soares-Furtado, Alexander P. Stephan, Jennifer van Saders, Jamie Tayar, Benjamin Shappee, Daniel R. Hey, Lyra Cao, Mutlu Yıldız, Zeynep Çelik Orhan, Sibel Örtel, Benjamin Montet, Thomas W.-S. Holoien, Joss Bland-Hawthorn, Sven Buder, Gayandhi M. De Silva, Ken C. Freeman, Sarah L. Martell, Geraint F. Lewis, Sanjib Sharma, Dennis Stello

Publikováno v: The Astrophysical Journal, Vol 966, Iss 1, p 42 (2024)

We report the discovery and characterization of TIC 350842552 (“Zvrk”), an apparently isolated, rapidly rotating ( P _rot ∼ 99 days) red giant observed by TESS in its southern Continuous Viewing Zone. The star’s fast surface rotation is indep

Externí odkaz: https://doaj.org/article/bb5b471dee324e7eada5b0ab43f2da63

Spinning up the Surface: Evidence for Planetary Engulfment or Unexpected Angular Momentum Transport?

Autor: Jamie Tayar, Facundo D. Moyano, Melinda Soares-Furtado, Ana Escorza, Meridith Joyce, Sarah L. Martell, Rafael A. García, Sylvain N. Breton, Stéphane Mathis, Savita Mathur, Vincent Delsanti, Sven Kiefer, Sabine Reffert, Dominic M. Bowman, Timothy Van Reeth, Shreeya Shetye, Charlotte Gehan, Samuel K. Grunblatt

Publikováno v: The Astrophysical Journal, Vol 940, Iss 1, p 23 (2022)

In this paper, we report the potential detection of a nonmonotonic radial rotation profile in a low-mass lower-luminosity giant star. For most low- and intermediate-mass stars, the rotation on the main sequence seems to be close to rigid. As these st

Externí odkaz: https://doaj.org/article/6001f52a1aa9479f86e2d63223f3da31

The GALAH Survey: dependence of elemental abundances on age and metallicity for stars in the Galactic disc

Autor: Daniel B. Zucker, Gayandhi M. De Silva, Joss Bland-Hawthorn, Prajwal R. Kafle, Karin Lind, Thor Tepper-García, Robert A. Wittenmyer, Sarah L. Martell, Tomaž Zwitter, Lorenzo Spina, Geraint F. Lewis, Martin Asplund, Katharine J. Schlesinger, Thomas Kallinger, Purmortal Wang, Michael R. Hayden, Joel C. Zinn, Jeffrey D. Simpson, Janez Kos, Sven Buder, Jane Lin, Shourya Khanna, Valentina D'Orazi, Dennis Stello, Sanjib Sharma, Boquan Chen, Kenneth C. Freeman, Klemen Čotar

Publikováno v: Monthly Notices of the Royal Astronomical Society
Sharma, S, Hayden, M R, Bland-Hawthorn, J, Stello, D, Buder, S, Zinn, J C, Spina, L, Kallinger, T, Asplund, M, De Silva, G M, D'Orazi, V, Freeman, K C, Kos, J, Lewis, G F, Lin, J, Lind, K, Martell, S L, Schlesinger, K J, Simpson, J D, Zucker, D B, Zwitter, T, Chen, B, Cotar, K, Kafle, P R, Khanna, S, Tepper-Garcia, T, Wang, P & Wittenmyer, R A 2022, ' The GALAH Survey : Dependence of elemental abundances on age and metallicity for stars in the Galactic disc ', Monthly Notices of the Royal Astronomical Society, vol. 510, no. 1, pp. 734-752 . https://doi.org/10.1093/mnras/stab3341
Monthly Notices of the Royal Astronomical Society, 510(1), 734-752. Oxford University Press

Using data from the GALAH survey, we explore the dependence of elemental abundances on stellar age and metallicity among Galactic disc stars. We find that the abundance of most elements can be predicted from age and [Fe/H] with an intrinsic scatter o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cf74e84973a87a79abd3390988832526
https://doi.org/10.1093/mnras/stab3341

The GALAH survey and symbiotic stars – I. Discovery and follow-up of 33 candidate accreting-only systems

Autor: Yuan-Sen Ting, A. Frigo, Sanjib Sharma, U. Munari, N. Masetti, P. Valisa, Daniel B. Zucker, Jeffrey D. Simpson, Robert A. Wittenmyer, G. L. Righetti, Sarah L. Martell, F. J. Hambsch, Gregor Traven, Geraint F. Lewis, Kenneth C. Freeman, G. M. De Silva, Klemen Čotar

Publikováno v: Monthly Notices of the Royal Astronomical Society. 505:6121-6154

We have identified a first group of 33 new candidates for symbiotic stars (SySt) of the accreting-only variety among the 600,255 stars so far observed by the GALAH high-resolution spectroscopic survey of the Southern Hemisphere, more than doubling th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::51c14a3c65d0fe125f2f9382577d0844
https://doi.org/10.1093/mnras/stab1620

The tidal remnant of an unusually metal-poor globular cluster

Autor: Jeffrey D. Simpson, Geraint F. Lewis, Zhen Wan, Eduardo Balbinot, Daniel B. Zucker, Prajwal R. Kafle, Gayandhi M. De Silva, Nora Shipp, Dougal Mackey, Alexander P. Ji, Joss Bland-Hawthorn, Sanjib Sharma, Andrew R. Casey, Andrew B. Pace, Ting S. Li, Sarah L. Martell, Kyler Kuehn, Jeremy Mould, Sergey E. Koposov, Denis Erkal, Gary S. Da Costa

Publikováno v: Nature, 583(7818), 768-770. Nature Publishing Group
Wan, Z, Lewis, G F, Li, T S, Simpson, J D, Martell, S L, Zucker, D B, Mould, J R, Erkal, D, Pace, A B, Mackey, D, Ji, A P, Koposov, S E, Kuehn, K, Shipp, N, Balbinot, E, Bland-Hawthorn, J, Casey, A R, Costa, G S D, Kafle, P, Sharma, S & Silva, G M D 2020, ' The tidal remnant of an unusually metal-poor globular cluster ', Nature, pp. 768-770 . https://doi.org/10.1038/s41586-020-2483-6

Globular clusters are some of the oldest bound stellar structures observed in the Universe. They are ubiquitous in large galaxies and are believed to trace intense star formation events and the hierarchical build-up of structure. Observations of glob

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ee0773f8e3c71223089b1a5ee375e008
https://doi.org/10.1038/s41586-020-2483-6