Zobrazeno 1 - 10
of 201
pro vyhledávání: '"Jay B. Holberg"'
Autor:
Tim Axelrod, Abhijit Saha, Thomas Matheson, Edward W. Olszewski, Ralph C. Bohlin, Annalisa Calamida, Jenna Claver, Susana Deustua, Jay B. Holberg, Ivan Hubeny, John W. Mackenty, Konstantin Malanchev, Gautham Narayan, Sean Points, Armin Rest, Elena Sabbi, Christopher W. Stubbs
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 1, p 78 (2023)
Hot DA white dwarfs (DAWDs) have fully radiative pure hydrogen atmospheres that are the least complicated to model. Pulsationally stable, they are fully characterized by their effective temperature T _eff and surface gravity $\mathrm{log}\,g$ , which
Externí odkaz:
https://doaj.org/article/b6eb1350c6b34f49ba29ec75e9eed043
Autor:
Lotfi Ben-Jaffel, Julianne I. Moses, Robert A. West, Klaus-Michael Aye, Eric T. Bradley, John T. Clarke, Jay B. Holberg, Gilda E. Ballester
Publikováno v:
The Planetary Science Journal, Vol 4, Iss 3, p 54 (2023)
A planet’s Ly α emission is sensitive to its thermospheric structure. Here we report joint Hubble Space Telescope and Cassini cross-calibration observations of the Saturn Ly α emission made 2 weeks before the Cassini grand finale. To investigate
Externí odkaz:
https://doaj.org/article/27b7cd43fd4d48b5af537c97e0c124fd
Autor:
Martin A. Barstow, Jay B. Holberg
This text describes the development of astronomy in the Extreme Ultraviolet (EUV) wavelength range, from the first rocket-based experiments in the late 1960s through to later satellite missions. Discussions of the results from important space project
Publikováno v:
Proceedings of the International Astronomical Union. 15:170-174
The Gaia DR2 has dramatically increased the ability to detect faint nearby white dwarfs. The census of the local white dwarf population has recently been extended from 25 pc to 50 pc, effectively increasing the sample by roughly an order of magnitude
Autor:
S. R. G. Joyce, Sarah L. Casewell, Howard E. Bond, Martin A. Barstow, Matthew R. Burleigh, Jay B. Holberg
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 481:2361-2370
Einstein's theory of General Relativity predicts that the light from stars will be gravitationally shifted to longer wavelengths. We previously used this effect to measure the mass of the white dwarf Sirius B from the wavelength shift observed in its
Publikováno v:
Proceedings of the International Astronomical Union. 12:301-304
White dwarfs are becoming useful tools for many areas of astronomy. They can be used as accurate chronometers over Gyr timescales. They are also clues to the history of star formation in our galaxy. Many of these studies require accurate estimates of
Autor:
S. P. Preval, Nicole Reindl, Jay B. Holberg, John K. Webb, Chung-Chi Lee, Matthew Bainbridge, Thomas R. Ayres, Jiting Hu, John D. Barrow, Martin A. Barstow
Using newly obtained high-resolution data ($R\sim{1\times{10}^{5}}$) from the \textit{Hubble Space Telescope}, and archival UV data from the \textit{Far Ultraviolet Spectroscopic Explorer} we have conducted a detailed UV survey of the three hot, meta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e3fbf1e61d39b53c0b71bce833d47df5
http://arxiv.org/abs/1905.12350
http://arxiv.org/abs/1905.12350
Autor:
Nicole Reindl, Chung-Chi Lee, Julian C. Berengut, John D. Barrow, Matthew Bainbridge, V. A. Dzuba, Jay B. Holberg, Thomas R. Ayres, Robert F. Carswell, Victor V. Flambaum, Jiting Hu, W. Ü. L. Tchang-Brillet, Martin A. Barstow, S. P. Preval, John K. Webb
Publikováno v:
Mon.Not.Roy.Astron.Soc.
Mon.Not.Roy.Astron.Soc., 2019, 485 (4), pp.5050-5058. ⟨10.1093/mnras/stz739⟩
Mon.Not.Roy.Astron.Soc., 2019, 485 (4), pp.5050-5058. ⟨10.1093/mnras/stz739⟩
White dwarf atmospheres are subjected to gravitational potentials around $10^5$ times larger than occur on Earth. They provide a unique environment in which to search for any possible variation in fundamental physics in the presence of strong gravita
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7e49f2ed64efefe901e98a506460bfae
https://hal.archives-ouvertes.fr/hal-01982913
https://hal.archives-ouvertes.fr/hal-01982913
Autor:
Seth Redfield, Boris T. Gänsicke, Jay Farihi, P. Wilson Cauley, Jay B. Holberg, David J. Wilson, S. P. Preval, Paul Chote, Claudia Belardi, Matthew R. Burleigh, Mark Hollands, Sarah L. Casewell, Knox S. Long, Martin A. Barstow, Detlev Koester, Odette Toloza
We present new Hubble Space Telescope (HST) ultraviolet and ground-based optical observations of the hot, metal-rich white dwarf GD 394. Extreme-ultraviolet (EUV) observations in 1992-1996 revealed a 1.15d periodicity with a 25 percent amplitude, hyp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1c3e5657335f843ab26ea2ef71ff538c
http://arxiv.org/abs/1811.10614
http://arxiv.org/abs/1811.10614
Autor:
S. R. G. Joyce, Sarah L. Casewell, Matthew R. Burleigh, Jay B. Holberg, Martin A. Barstow, Howard E. Bond
Publikováno v:
Monthly Notices of the Royal Astronomical Society.
Observational tests of the white dwarf mass-radius relationship have always been limited by the uncertainty in the available distance measurements. Most studies have focused on Balmer line spectroscopy because these spectra can be obtained from groun