Zobrazeno 1 - 10
of 443
pro vyhledávání: '"H A Townsend"'
Autor:
Cole Johnston, Mathias Michielsen, Evan H. Anders, Mathieu Renzo, Matteo Cantiello, P. Marchant, Jared A. Goldberg, Richard H. D. Townsend, Gautham Sabhahit, Adam S. Jermyn
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 2, p 170 (2024)
One-dimensional stellar evolution calculations produce uncertain predictions for quantities like the age, core mass, core compactness, and nucleosynthetic yields; a key source of uncertainty is the modeling of interfaces between regions that are conv
Externí odkaz:
https://doaj.org/article/ce66b8e98b7a468c94b2a6bde2678dd3
Autor:
R. H. D. Townsend, M. Sun
Publikováno v:
The Astrophysical Journal, Vol 953, Iss 1, p 48 (2023)
We examine the reasons for discrepancies between two alternative approaches to modeling small-amplitude tides in binary systems. The direct solution (DS) approach solves the governing differential equations and boundary conditions directly, while the
Externí odkaz:
https://doaj.org/article/614b3b697c65450aa6b391c9efcf7ea5
Publikováno v:
The Astrophysical Journal, Vol 945, Iss 1, p 43 (2023)
We describe new functionality in the GYRE stellar oscillation code for modeling tides in binary systems. Using a multipolar expansion in space and a Fourier-series expansion in time, we decompose the tidal potential into a superposition of partial ti
Externí odkaz:
https://doaj.org/article/e23d6bcf59e44244a635144a7e9a261c
Autor:
Adam S. Jermyn, Evan B. Bauer, Josiah Schwab, R. Farmer, Warrick H. Ball, Earl P. Bellinger, Aaron Dotter, Meridith Joyce, Pablo Marchant, Joey S. G. Mombarg, William M. Wolf, Tin Long Sunny Wong, Giulia C. Cinquegrana, Eoin Farrell, R. Smolec, Anne Thoul, Matteo Cantiello, Falk Herwig, Odette Toloza, Lars Bildsten, Richard H. D. Townsend, F. X. Timmes
Publikováno v:
The Astrophysical Journal Supplement Series, Vol 265, Iss 1, p 15 (2023)
We update the capabilities of the open-knowledge software instrument Modules for Experiments in Stellar Astrophysics ( MESA ). The new auto _ diff module implements automatic differentiation in MESA , an enabling capability that alleviates the need f
Externí odkaz:
https://doaj.org/article/8b2d350d4c7143ca9b52af8a82fb2d0e
Autor:
M. S. Oey, N. Castro, M. Renzo, I. Vargas-Salazar, M. W. Suffak, M. Ratajczak, J. D. Monnier, M. K. Szymanski, G. D. Phillips, N. Calvet, A. Chiti, G. Micheva, K. C. Rasmussen, R. H. D. Townsend
Publikováno v:
The Astrophysical Journal, Vol 947, Iss 1, p 27 (2023)
We present 18 yr of OGLE photometry together with spectra obtained over 12 yr revealing that the early Oe star AzV 493 shows strong photometric (Δ I < 1.2 mag) and spectroscopic variability with a dominant, 14.6 yr pattern and ∼40 day oscillations
Externí odkaz:
https://doaj.org/article/89dc505d0e5d464c839bd8f62614810d
Autor:
Richard H. D. Townsend
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 497:2670-2679
Laplace's tidal equations govern the angular dependence of oscillations in stars when uniform rotation is treated within the so-called traditional approximation. Using a perturbation expansion approach, I derive improved expressions for the eigenvalu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::822aec8e5d1063c3aaed1bebd56d4187
https://doi.org/10.1093/mnras/staa2159
https://doi.org/10.1093/mnras/staa2159
Autor:
Véronique Petit, Alexandre David-Uraz, Gregg A. Wade, Z. Keszthelyi, Georges Meynet, Asif ud-Doula, Richard H. D. Townsend, Cyril Georgy, Stan Owocki, Matt Shultz
Publikováno v:
Monthly Notices of the Royal Astronomical Society, 493(1), 518-535. Oxford University Press
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society
The time evolution of angular momentum and surface rotation of massive stars is strongly influenced by fossil magnetic fields via magnetic braking. We present a new module containing a simple, comprehensive implementation of such a field at the surfa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6573b805e18271262d13032bfeda9edf
https://hdl.handle.net/11245.1/cd417143-d1f7-4c36-9190-4210a053f8cd
https://hdl.handle.net/11245.1/cd417143-d1f7-4c36-9190-4210a053f8cd
Publikováno v:
Monthly Notices of the Royal Astronomical Society
Monthly Notices of the Royal Astronomical Society, 2022, 517, pp.437-446. ⟨10.1093/mnras/stac2611⟩
Monthly Notices of the Royal Astronomical Society, 2022, 517, pp.437-446. ⟨10.1093/mnras/stac2611⟩
We revisit the Tidally Excited Oscillations (TEOs) in the A-type, main-sequence, eccentric binary KOI-54, the prototype of heartbeat stars. Although the linear tidal response of the star is a series of orbital-harmonic frequencies which are not stell
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02a18ccea33c6c9f06bed8073eb72631
Autor:
M. L. Winther, Zeynep Çelik Orhan, Jennifer L. van Saders, Richard H. D. Townsend, Daniel Huber, Maïssa Salama, Sibel Örtel, Victor Silva Aguirre, R. Paul Butler, Savita Mathur, Travis A. Berger, Keivan G. Stassun, Aldo Serenelli, Hans Kjeldsen, Ashley Chontos, Timothy R. Bedding, Jia Mian Joel Ong, Mia S. Lundkvist, Zachary R. Claytor, Steve B. Howell, Robert A. Wittenmyer, Warrick H. Ball, Martin Bo Nielsen, C. G. Tinney, Sarbani Basu, Travis S. Metcalfe, Mutlu Yildiz, Rafael A. García, Enrico Corsaro, William J. Chaplin
Publikováno v:
Digital.CSIC. Repositorio Institucional del CSIC
instname
Chontos, A, Huber, D, Berger, T A, Kjeldsen, H, Serenelli, A M, Silva Aguirre, V, Ball, W H, Basu, S, Bedding, T R, Chaplin, W J, Claytor, Z R, Corsaro, E, Garcia, R A, Howell, S B, Lundkvist, M S, Mathur, S, Metcalfe, T S, Nielsen, M B, Mian Joel Ong, J, Celik Orhan, Z, Ortel, S, Salama, M, Stassun, K G, Townsend, R H D, Van Saders, J L, Winther, M, Yildiz, M, Butler, R P, Tinney, C G & Wittenmyer, R A 2021, ' TESS Asteroseismology of α Mensae : Benchmark Ages for a G7 Dwarf and Its M Dwarf Companion ', Astrophysical Journal, vol. 922, no. 2, 229 . https://doi.org/10.3847/1538-4357/ac1269
instname
Chontos, A, Huber, D, Berger, T A, Kjeldsen, H, Serenelli, A M, Silva Aguirre, V, Ball, W H, Basu, S, Bedding, T R, Chaplin, W J, Claytor, Z R, Corsaro, E, Garcia, R A, Howell, S B, Lundkvist, M S, Mathur, S, Metcalfe, T S, Nielsen, M B, Mian Joel Ong, J, Celik Orhan, Z, Ortel, S, Salama, M, Stassun, K G, Townsend, R H D, Van Saders, J L, Winther, M, Yildiz, M, Butler, R P, Tinney, C G & Wittenmyer, R A 2021, ' TESS Asteroseismology of α Mensae : Benchmark Ages for a G7 Dwarf and Its M Dwarf Companion ', Astrophysical Journal, vol. 922, no. 2, 229 . https://doi.org/10.3847/1538-4357/ac1269
Asteroseismology of bright stars has become increasingly important as a method to determine the fundamental properties (in particular ages) of stars. The Kepler Space Telescope initiated a revolution by detecting oscillations in more than 500 main-se
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abcd89a11dcf25bc55af6ddc2c47c1b9
http://hdl.handle.net/10261/261934
http://hdl.handle.net/10261/261934
Autor:
Stanley P. Owocki, J. O. Sundqvist, Matt Shultz, Steven R. Cranmer, Asif ud-Doula, Richard H. D. Townsend
Strongly magnetic B-type stars with moderately rapid rotation form `centrifugal magnetospheres' (CMs), from the magnetic trapping of stellar wind material in a region above the Kepler co-rotation radius. A longstanding question is whether the eventua
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0dd39f5f969db92c7123de11fcf993f8
http://arxiv.org/abs/2009.12359
http://arxiv.org/abs/2009.12359