Zobrazeno 1 - 10
of 225
pro vyhledávání: '"Holberg, J. B."'
To calculate realistic models of objects with Ni in their atmospheres, accurate atomic data for the relevant ionization stages need to be included in model atmosphere calculations. In the context of white dwarf stars, we investigate the effect of cha
Externí odkaz:
http://hdl.handle.net/10150/623044
http://arizona.openrepository.com/arizona/handle/10150/623044
http://arizona.openrepository.com/arizona/handle/10150/623044
We have extended our detailed survey of the local white dwarf population from 20 to 25 pc, effectively doubling the sample volume, which now includes 232 stars. In the process, newstars within 20 pc have been added, a more uniform set of distance est
Externí odkaz:
http://hdl.handle.net/10150/621732
http://arizona.openrepository.com/arizona/handle/10150/621732
http://arizona.openrepository.com/arizona/handle/10150/621732
Autor:
Ben-Jaffel, Lotfi, Holberg, J. B.
The data harvest from the Voyagers' (V1 and V2) Ultraviolet Spectrometers (UVS) covers encounters with the outer planets, measurements of the heliosphere sky-background, and stellar spectrophotometry. Because their period of operation overlaps with m
Externí odkaz:
http://hdl.handle.net/10150/621239
http://arizona.openrepository.com/arizona/handle/10150/621239
http://arizona.openrepository.com/arizona/handle/10150/621239
Autor:
Narayan, G., Axelrod, T., Holberg, J. B., Matheson, T., Saha, A., Olszewski, E., Claver, J., Stubbs, C. W., Bohlin, R. C., Deustua, S., Rest, A.
We present the initial results from a program aimed at establishing a network of hot DA white dwarfs to serve as spectrophotometric standards for present and future wide-field surveys. These stars span the equatorial zone and are faint enough to be c
Externí odkaz:
http://hdl.handle.net/10150/621236
http://arizona.openrepository.com/arizona/handle/10150/621236
http://arizona.openrepository.com/arizona/handle/10150/621236
Autor:
Preval, S. P., Barstow, M. A., Bainbridge, M., Reindl, N., Ayres, T., Holberg, J. B., Barrow, J. D., Lee, C. C., Webb, J. K., Hu, J.
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:
http://arxiv.org/abs/1905.12350
Autor:
Hu, J., Webb, J. K., Ayres, T. R., Bainbridge, M. B., Barrow, J. D., Barstow, M. A., Berengut, J. C., Carswell, R. F., Dzuba, V. A., Flambaum, V. V., Holberg, J. B., Lee, C. C., Preval, S. P., Reindl, N., Tchang-Brillet, W. -Ü L.
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:
http://arxiv.org/abs/1812.11480
Autor:
Joyce, S. R. G., Barstow, M. A., Casewell, S. L., Burleigh, M. R., Holberg, J. B., Bond, H. E.
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
Externí odkaz:
http://arxiv.org/abs/1806.00061
To calculate realistic models of objects with Ni in their atmospheres, accurate atomic data for the relevant ionization stages needs to be included in model atmosphere calculations. In the context of white dwarf stars, we investigate the effect of ch
Externí odkaz:
http://arxiv.org/abs/1610.09662
Autor:
Barstow, M. A., Bond, H. E., Burleigh, M. R., Casewell, S. L., Farihi, J., Holberg, J. B., Hubeny, I.
The presence of a white dwarf in a resolved binary system, such as Sirius, provides an opportunity to combine dynamical information about the masses, from astrometry and spectroscopy, with a gravitational red-shift measurement and spectrophotometry o
Externí odkaz:
http://arxiv.org/abs/1505.03427