Zobrazeno 1 - 10
of 39
pro vyhledávání: '"Donald Hoard"'
Autor:
Steve B. Howell, Robert O. Harmon, Donald Hoard, Justin Ely, John H. Debes, Rachael M. Roettenbacher
Publikováno v:
The Astronomical Journal. 156:119
We analyze extensive ground- and space-based ultraviolet-infrared observations of the variable white dwarf BOKS 53856. Photometry and spectroscopy were obtained from the Hubble Space Telescope, Spi ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bf263849ed3b332c9f469481951b55e
https://doi.org/10.3847/1538-3881/aad238
https://doi.org/10.3847/1538-3881/aad238
Publikováno v:
Astrophysical Journal
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
Artículos CONICYT
CONICYT Chile
instacron:CONICYT
We present ISAAC spectroscopy and ISAAC, UKIDSS and Spitzer Space Telescope broad-band photometry of SDSS J1228+1040 -- a white dwarf for which evidence of a gaseous metal-rich circumstellar disk has previously been found from optical emission lines.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1c369174dc18defb06236587a82970c
https://doi.org/10.1088/0004-637x/696/2/1402
https://doi.org/10.1088/0004-637x/696/2/1402
Publikováno v:
The Astronomical Journal. 132:1989-1994
We present four MIPS (24 \micron) and two IRAC (3.6, 4.5, 5.8, and 8.0 \micron) Spitzer observations of the newly discovered Tremendous Outburst Amplitude Dwarf nova (TOAD) Var Her 04 during decline from super-outburst. The four MIPS observations spa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ded415898a56bf1b898d32b23f7abfec
https://doi.org/10.1086/508212
https://doi.org/10.1086/508212
Autor:
Bing Chen, Gary D. Schmidt, Scott F. Anderson, Paula Szkody, J. Brinkmann, Arne Henden, Donald Hoard, Wolfgang Voges, Lee Homer
Publikováno v:
The Astronomical Journal. 128:2443-2447
XMM-Newton observations of the polar SDSSJ155331.12+551614.5 reveal that all the X-ray flux emerges at energies less than 2 keV. The best fit to the spectrum is with a thermal plasma with kT=0.8 keV plus a 20-90 ev black body, yielding a thermal X-ra
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b984cd3d6cd92c8466f85b342831816b
https://doi.org/10.1086/424540
https://doi.org/10.1086/424540
Autor:
Donald Hoard, Paula Szkody, K. Nishikida, Edward M. Sion, Knox S. Long, Anil C. Seth, John C. Raymond
Publikováno v:
The Astrophysical Journal. 574:942-949
We have observed the prototypical dwarf nova U Gem at quiescence with the Chandra medium- and high-resolution gratings to accomplish the first study of resolved X-ray emission lines in a disk-accreting cataclysmic variable. Doppler tomograms construc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98031cf1f8f64d504ceb9eb38db32409
https://doi.org/10.1086/341006
https://doi.org/10.1086/341006
Autor:
Rodolfo Montez, Andrew C. Layden, Gabriel Brammer, Donald Hoard, Shadrian Holmes, Jorge Cuadra, Kathy L. Cooksey, Alicia S. Day, Erika Labbe
Publikováno v:
Publications of the Astronomical Society of the Pacific. 114:645-649
We present light curves in the B, V, and I passbands for six field RR Lyrae stars. We derive the stars' intensity‐mean magnitudes, light amplitudes, and colors at minimum light. We compare the latter with measurements from other variables and discu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a45e2a789a47f25f03698284e51b66d8
https://doi.org/10.1086/341685
https://doi.org/10.1086/341685
Publikováno v:
Publications of the Astronomical Society of the Pacific. 112:1595-1606
We present an analysis of ground-based optical photometry and spectroscopy, and Rossi X-ray Timing Explorer X-ray observations of the old novae DI Lacertae and V841 Ophiuchi. Our optical photometry data (obtained with the automated photometry telesco
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9eec88d9969a4ea55d789f8898233c4b
https://doi.org/10.1086/317722
https://doi.org/10.1086/317722
Autor:
Paula Szkody, Vandana Desai, Donald Hoard, Boris T. Gänsicke, Robert E. Fried, Todd Burdullis, Peter M. Garnavich
Publikováno v:
The Astrophysical Journal. 540:983-991
To explore the amount of secondary irradiation and the long-term effects of a superoutburst (SOB) on tremendous outburst amplitude dwarf novae (TOADs), we obtained spectra of EG Cnc for 3-17 months past its SOB, of SW UMa, WX Cet, and USNO 1425.09823
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea8d216136444fa46fad8b9a599b992f
https://doi.org/10.1086/309375
https://doi.org/10.1086/309375
Publikováno v:
The Astrophysical Journal. 539:L49-L53
We present the ultraviolet spectrum of the SW Sextantis star and nova-like variable DW Ursae Majoris in an optical low state, as observed with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope (HST). The data are well descr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b90b863223ce8d07d188342465f6953d
https://doi.org/10.1086/312825
https://doi.org/10.1086/312825
Publikováno v:
The Astronomical Journal. 119:365-368
Three nights of blue and red spectroscopy of the extreme-amplitude dwarf nova GW Lib at quiescence show that the orbital period is 79.4 minutes and the semiamplitude of the Hβ emission-line velocity curve is 40.0 km s-1. The emission lines are very
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a2c06f54a6da33dbe0a1fdf09fb8b8b1
https://doi.org/10.1086/301183
https://doi.org/10.1086/301183