Zobrazeno 1 - 10 of 127 pro vyhledávání: '"Donald E Winget"'
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The Pulsating White Dwarf G117-B15A: Still the Most Stable Optical Clock Known
Autor: J. J. Hermes, Michael H. Montgomery, Paul Chote, Fergal Mullally, Alejandra D. Romero, D. Chandler, K. I. Winget, Donald E Winget, Steven DeGennaro, Staszek Zola, Souza Oliveira Kepler, Kurtis A. Williams, Keaton J. Bell, Zachary P. Vanderbosch, Barbara G. Castanheira, Elizabeth J. Jeffery, Jamile K. Fritzen
Publikováno v: The Astrophysical Journal. 906:7
The pulsating hydrogen atmosphere white dwarf star G 117-B15A has been observed since 1974. Its main pulsation period at 215.19738823(63) s, observed in optical light curves, varies by only (5.12+/-0.82)x10^{-15} s/s and shows no glitches, as pulsars
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9e2f00f218477daf7a77d4d9e4579f8
https://doi.org/10.3847/1538-4357/abc626
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4
An experimental platform for creating white dwarf photospheres in the laboratory: Preliminary results
Autor: Gregory Rochau, Michael H. Montgomery, Donald E Winget, James E. Bailey, Thomas Gomez, A. L. Carlson, M. Stein, Taisuke Nagayama, David E. Bliss, Ross E. Falcon
Publikováno v: High Energy Density Physics. 17:168-174
We present the current status of the White Dwarf Photosphere Experiment at the Z Pulsed Power Facility at Sandia National Laboratories. This experiment has evolved into a unique platform for simultaneously measuring emission, absorption, and back-lig
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0074780077277b5bc5a651eb335f90d4
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5
Outliers: multicolour photometry guiding the search for evolved binary systems in the globular cluster 47 Tucanae
Autor: Fabíola Campos, Sebastian Kamann, Michael H. Montgomery, Andrea Bellini, Stefan Dreizler, Tim Oliver Husser, Domenico Nardiello, Ingrid Domingos Pelisoli, Giampaolo Piotto, Souza Oliveira Kepler, Edward L. Robinson, Aaron Dotter, Alina G. Istrate, Donald E Winget
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Monthly Notices of the Royal Astronomical Society
We use Hubble Space Telescope multicolour photometry of the globular cluster 47 Tucanae to uncover a population of 24 objects with no previous classification that are outliers from the single-star model tracks in the colour-magnitude diagram and yet
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b425441e7c6e59cb8ad4525f8b9be81d
http://arxiv.org/abs/1809.07746
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6
The McDonald Observatory search for pulsating sdA stars: asteroseismic support for multiple populations
Autor: Souza Oliveira Kepler, K. I. Winget, Ingrid Pelisoli, Z. Vanderbosch, Keaton J. Bell, D. Koester, Warren R. Brown, J. J. Hermes, Michael H. Montgomery, Donald E Winget, Barbara G. Castanheira
Publikováno v: Bell, K J, Pelisoli, I, Kepler, S O, Brown, W R, Winget, D E, Winget, K I, Vanderbosch, Z, Castanheira, B G, Hermes, J J, Montgomery, M H & Koester, D 2018, ' The McDonald Observatory search for pulsating sdA stars Asteroseismic support for multiple populations ', Astronomy & Astrophysics, vol. 617, 6 . https://doi.org/10.1051/0004-6361/201833279
Context. The nature of the recently identified "sdA" spectroscopic class of star is not well understood. The thousands of known sdAs have H-dominated spectra, spectroscopic surface gravities intermediate to main sequence stars and isolated white dwar
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c87b3d4fb8386cd6333ee7bbde90563c
http://arxiv.org/abs/1805.11129
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8
Four New Massive Pulsating White Dwarfs Including an Ultramassive DAV
Autor: Keaton J. Bell, K. I. Winget, Carlos Allende Prieto, Donald E Winget, Mukremin Kilic, Alejandra D. Romero, Brandon Curd, Alexandros Gianninas
We report the discovery of four massive ($M > 0.8\,M_\odot$) ZZ Ceti white dwarfs, including an ultramassive $1.16\,M_\odot$ star. We obtained ground based, time-series photometry for thirteen white dwarfs from the Sloan Digital Sky Survey Data Relea
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3b08cb64bc60202083224ddc1b4f714
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9
Destroying Aliases from the Ground and Space: Super-Nyquist ZZ Cetis in K2 Long Cadence Data
Autor: J. J. Hermes, Pier-Emmanuel Tremblay, Michael H. Montgomery, Erik Dennihy, Keaton J. Bell, J. T. Fuchs, Donald E Winget, Z. Vanderbosch
Publikováno v: NASA Astrophysics Data System
The Astrophysical Journal
With typical periods of order 10 minutes, the pulsation signatures of ZZ Ceti variables (pulsating hydrogen-atmosphere white dwarf stars) are severely undersampled by long-cadence (29.42 minutes per exposure) K2 observations. Nyquist aliasing renders
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ebe05f22f689e8e9f71954a806184dac
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10
A new class of pulsating white dwarf of extremely low mass: the fourth and fifth members
Autor: Samuel T. Harrold, Keaton J. Bell, Mukremin Kilic, Alexandros Gianninas, J. J. Hermes, Donald E Winget, Warren R. Brown, B. G. Castanheira, Michael H. Montgomery, Scott J. Kenyon
Publikováno v: Monthly Notices of the Royal Astronomical Society. 436:3573-3580
We report the discovery of two new pulsating extremely low-mass (ELM) white dwarfs (WDs), SDSS J161431.28+191219.4 (hereafter J1614) and SDSS J222859.93+362359.6 (hereafter J2228). Both WDs have masses
9 pages, 5 figures, 5 tables; accepted to M
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fd129033adb0416a2d35322d9ebc982
https://doi.org/10.1093/mnras/stt1835
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