Zobrazeno 1 - 10
of 714
pro vyhledávání: '"Liebert, J"'
Publikováno v:
Steward Observatory Parker Library SO QB 4 .S752 ARCH
Externí odkaz:
http://hdl.handle.net/10150/623908
http://arizona.openrepository.com/arizona/handle/10150/623908
http://arizona.openrepository.com/arizona/handle/10150/623908
Autor:
Saffer, R. A., Liebert, J.
Publikováno v:
Steward Observatory Parker Library SO QB 4 .S752 ARCH
We report on a search for short -period binary systems composed of pairs of evolved stars. The search is being carried out concurrently with a program to characterize the kinematical properties of two different samples of stars. Each sample has produ
Externí odkaz:
http://hdl.handle.net/10150/623897
http://arizona.openrepository.com/arizona/handle/10150/623897
http://arizona.openrepository.com/arizona/handle/10150/623897
Publikováno v:
Steward Observatory Parker Library SO QB 4 .S752 ARCH
We report on high dispersion spectroscopy of the Ha absorption line of the cool DA white dwarf G 29 -38. This is the star for which a recently detected infrared excess has been suggested to be due to a possible brown dwarf companion by Zuckerman and
Externí odkaz:
http://hdl.handle.net/10150/623899
http://arizona.openrepository.com/arizona/handle/10150/623899
http://arizona.openrepository.com/arizona/handle/10150/623899
Autor:
Berger, E., Basri, G., Fleming, T. A., Giampapa, M. S., Gizis, J. E., Liebert, J., Martin, E. L., Phan-Bao, N., Rutledge, R. E.
Publikováno v:
Astrophys.J.709:332-341,2010
[Abridged] As part of our on-going investigation into the magnetic field properties of ultracool dwarfs, we present simultaneous radio, X-ray, and H-alpha observations of three M9.5-L2.5 dwarfs (BRI0021-0214, LSR060230.4+391059, and 2MASSJ052338.2-14
Externí odkaz:
http://arxiv.org/abs/0909.4783
Autor:
Kilic, Mukremin, Brown, Warren R., Prieto, Carlos Allende, Swift, B., Kenyon, S. J., Liebert, J., Agueros, M. A.
We report the detection of a radial velocity companion to the extremely low mass white dwarf LP400-22. The radial velocity of the white dwarf shows variations with a semi-amplitude of 119 km/s and a 0.98776 day period, which implies a companion mass
Externí odkaz:
http://arxiv.org/abs/0903.1843
Publikováno v:
J.Phys.Conf.Ser.172:012066,2009
We present some of the results of a survey aimed at exploring the asteroseismological potential of the newly-discovered carbon-atmosphere white dwarfs. We show that, in certains regions of parameter space, carbon-atmosphere white dwarfs may drive low
Externí odkaz:
http://arxiv.org/abs/0901.3489
Publikováno v:
J.Phys.Conf.Ser.172:012012,2009
Recently, Dufour et al. (2007) reported the unexpected discovery that a few white dwarfs found in the Sloan Digital Sky Survey had an atmosphere dominated by carbon with little or no trace of hydrogen and helium. Here we present a progress report on
Externí odkaz:
http://arxiv.org/abs/0901.3487
Autor:
Roelofs, G. H. A., Groot, P. J., Steeghs, D., Rau, A., de Groot, E., Marsh, T. R., Nelemans, G., Liebert, J., Woudt, P.
We describe a spectroscopic survey designed to uncover an estimated ~40 AM CVn stars hiding in the photometric database of the Sloan Digital Sky Survey (SDSS). We have constructed a relatively small sample of about 1500 candidates based on a colour s
Externí odkaz:
http://arxiv.org/abs/0811.3974
Autor:
Berger, E., Rutledge, R. E., Phan-Bao, N., Basri, G., Giampapa, M. S., Gizis, J. E., Liebert, J., Martin, E., Fleming, T. A.
Publikováno v:
Astrophys.J.695:310-316,2009
[Abridged] We present an 8.5-hour simultaneous radio, X-ray, UV, and optical observation of the L dwarf binary 2MASSW J0746+20. We detect strong radio emission, dominated by short-duration periodic pulses at 4.86 GHz with P=124.32+/-0.11 min. The sta
Externí odkaz:
http://arxiv.org/abs/0809.0001
We report the discovery of a strong magnetic field in the unique pulsating carbon-atmosphere white dwarf SDSS J142625.71+575218.3. From spectra gathered at the MMT and Keck telescopes, we infer a surface field of B_s ~1.2 MG, based on obvious Zeeman
Externí odkaz:
http://arxiv.org/abs/0807.1112