Zobrazeno 1 - 10 of 25 pro vyhledávání: '"J. B. Holberg"'
1
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The 25 Parsec Local White Dwarf Population
Autor: Oswalt, J. B. Holberg T. D., Sion, E. M., McCook, G. P.
We have extended our detailed survey of the local white dwarf population from 20 pc to 25 pc, effectively doubling the sample volume, which now includes 232 stars. In the process new stars within 20 pc have been added, a more uniform set of distance
Externí odkaz: http://arxiv.org/abs/1606.01236
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2
A search for binarity using Far-Ultraviolet Spectroscopic Explorer observations of DAO white dwarfs
Autor: S. A. Good, M. A. Barstow, M. R. Burleigh, P. D. Dobbie, J. B. Holberg
Publikováno v: Monthly Notices of the Royal Astronomical Society. 364:1082-1090
We report on a search for evidence of binarity in Far-Ultraviolet Spectroscopic Explorer (FUSE) observations of DAO white dwarfs. Spectra recorded by FUSE are built up from a number of separate exposures. Observation of changes in the position of pho
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0991662c19983b79207a9dd3326e3d2b
https://doi.org/10.1111/j.1365-2966.2005.09647.x
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3
IUE Echelle observations of the photospheres and circumstellar environments of hot white dwarfs
Autor: J. B. Holberg
Publikováno v: White Dwarfs ISBN: 9783540591573
For well over a decade, narrow, interstellar-like features have been observed in the high resolution ME spectra of many hot white dwarfs. It is now clear that these features originate in at least two different environments. In many of the hottest whi
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3095483c66ef71dc83e8b3269403c9fb
https://doi.org/10.1007/3-540-59157-5_197
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5
Spectra of the Far–Ultraviolet Background Shortward of 1200 Å from Voyager 2
Autor: J. B. Holberg
Publikováno v: Symposium - International Astronomical Union. 139:220-222
Deep spectra of the far-ultraviolet sky background have been obtained by the Voyager 2 Ultraviolet Spectrometer (UVS) in the 500 to 1200 Å wavelength range. New diffuse galactic background results—particularly in the 900 to 1100 Å region—are pr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f3752398ce3b1ab5a4b839fe7de7b8df
https://doi.org/10.1017/s0074180900240709
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7
What fraction of white dwarfs are members of binary systems?
Autor: J B Holberg
Publikováno v: Journal of Physics: Conference Series. 172:012022
White dwarfs were originally discovered as the subordinate faint companions of bright nearby stars (i.e. Sirius B and 40 Eri B). Several general categories of binary systems involving white dwarfs are recognized: Sirius-like systems, where the white
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ee282a8c6263f6d6b34e29bdf9029e86
https://doi.org/10.1088/1742-6596/172/1/012022
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9
UBV photometry of hot white dwarf stars
Autor: James Collins, Mathew Cheselka, Ron Watkins, R. W. Tweedy, J. B. Holberg
Publikováno v: The Astronomical Journal. 106:2365
Johnson UBV photometry has been obtained for a set of hot degenerate stars, primarily DA and DO white dwarfs from among those detected in the Palomar-Green survey of UV excess objects. Most of our program stars have estimated effective temperatures (
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e1318f0b210819a17a4526badaed1575
https://doi.org/10.1086/116808
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