Zobrazeno 51 - 60
of 178
pro vyhledávání: '"Bell, Keaton J."'
Autor:
Kilic, Mukremin, Gianninas, Alexandros, Bell, Keaton J., Curd, Brandon, Brown, Warren R., Hermes, J. J., Dufour, Patrick, Wisniewski, John P., Winget, D. E., Winget, K. I.
We present the serendipitous discovery of eclipse-like events around the massive white dwarf SDSS J152934.98+292801.9 (hereafter J1529+2928). We selected J1529+2928 for time-series photometry based on its spectroscopic temperature and surface gravity
Externí odkaz:
http://arxiv.org/abs/1511.07320
Autor:
Hermes, J. J., Montgomery, M. H., Bell, Keaton J., Chote, P., Gaensicke, B. T., Kawaler, Steven D., Clemens, J. C., Dunlap, B. H., Winget, D. E., Armstrong, D. J.
We present observations of a new phenomenon in pulsating white dwarf stars: large-amplitude outbursts at timescales much longer than the pulsation periods. The cool (Teff = 11,010 K), hydrogen-atmosphere pulsating white dwarf PG 1149+057 was observed
Externí odkaz:
http://arxiv.org/abs/1507.06319
Autor:
Bell, Keaton J., Hermes, J. J., Bischoff-Kim, A., Moorhead, Sean, Montgomery, M. H., Østensen, Roy, Castanheira, Barbara G., Winget, D. E.
We present the Kepler light curve of KIC 4552982, the first ZZ Ceti (hydrogen-atmosphere pulsating white dwarf star) discovered in the Kepler field of view. Our data span more than 1.5 years with a 86% duty cycle, making it the longest pseudo-continu
Externí odkaz:
http://arxiv.org/abs/1506.07878
Autor:
Hernandez, Mercedes S, Schreiber, Matthias R, Landstreet, John D, Bagnulo, Stefano, Parsons, Steven G, Chavarria, Martin, Toloza, Odette, Bell, Keaton J
Publikováno v:
Monthly Notices of the Royal Astronomical Society; 3/15/2024, Vol. 528 Issue 4, p6056-6074, 19p
Autor:
Hermes, J. J., Brown, Warren R., Kilic, Mukremin, Gianninas, A., Chote, Paul, Sullivan, D. J., Winget, D. E., Bell, Keaton J., Falcon, R. E., Winget, K. I., Mason, Paul A., Harrold, Samuel T., Montgomery, M. H.
We carry out high-speed photometry on 20 of the shortest-period, detached white dwarf binaries known and discover systems with eclipses, ellipsoidal variations (due to tidal deformations of the visible white dwarf), and Doppler beaming. All of the bi
Externí odkaz:
http://arxiv.org/abs/1407.3798
Akademický článek
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Autor:
Kilic, Mukremin, Hermes, J. J., Gianninas, A., Brown, Warren R., Heinke, Craig O., Agueros, M. A., Chote, Paul, Sullivan, Denis J., Bell, Keaton J., Harrold, Samuel T.
We present optical and X-ray observations of two tidally distorted, extremely low-mass white dwarfs (WDs) with massive companions. There is no evidence of neutron stars in our Chandra and XMM observations of these objects. SDSS J075141.18$-$014120.9
Externí odkaz:
http://arxiv.org/abs/1310.6359
Autor:
Hermes, J. J., Montgomery, M. H., Gianninas, A., Winget, D. E., Brown, Warren R., Harrold, Samuel T., Bell, Keaton J., Kenyon, Scott J., Kilic, Mukremin, Castanheira, Barbara G.
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 <0.25 Msun and thus likely harbor helium cores.
Externí odkaz:
http://arxiv.org/abs/1310.0013
Autor:
Hermes, J. J., Montgomery, M. H., Winget, D. E., Brown, Warren R., Gianninas, A., Kilic, Mukremin, Kenyon, Scott J., Bell, Keaton J., Harrold, Samuel T.
We report the discovery of the second and third pulsating extremely low mass white dwarfs (WDs), SDSS J111215.82+111745.0 (hereafter J1112) and SDSS J151826.68+065813.2 (hereafter J1518). Both have masses < 0.25 Msun and effective temperatures below
Externí odkaz:
http://arxiv.org/abs/1211.1022
Autor:
Bell, Keaton J., Hilton, Eric J., Davenport, James R. A., Hawley, Suzanne L., West, Andrew A., Rogel, Allen B.
We use ~12,000 spectra of ~3,500 magnetically active M0-M9 dwarfs from the Sloan Digital Sky Survey taken at 10-15 minute intervals, together with ~300 spectra of ~60 M0-M8 stars obtained hourly with the Hydra multi-object spectrometer, to probe H\al
Externí odkaz:
http://arxiv.org/abs/1112.1411