Results 41 to 50 of about 365 (77)

NuSTAR and swift observations of the fast rotating magnetized white dwarf AE Aquarii [PDF]

, 2013
AE Aquarii is a cataclysmic variable with the fastest known rotating magnetized white dwarf (P_(spin) = 33.08 s). Compared to many intermediate polars, AE Aquarii shows a soft X-ray spectrum with a very low luminosity (L X ~ 10^(31) erg s^(–1)).
An, Hongjun, Beloborodov, Andrei M., Boggs, Steven E., Christensen, Finn Erland, Craig, William W., Gotthelf, Eric V., Hailey, Charles J., Harrison, Fiona A., Hayashi, Takayuki, Kaspi, Victoria M., Kitaguchi, Takao, Rana, Vikram R., Stern, Daniel, Zhang, Will W.   +13 more
core   +5 more sources

Evolution of the Inner Accretion Flow and the White Dwarf Spin Pulse during the 2023 Outburst in GK Persei

The Astrophysical Journal
We present our X-ray and optical observations performed by NICER, NuSTAR, and Tomo-e Gozen during the 2023 outburst in the intermediate polar GK Persei. The X-ray spectrum consisted of three components: blackbody (BB) emission of several tens of eVs from
Mariko Kimura, Takayuki Hayashi, Yuuki Wada, Wataru Iwakiri, Shigeyuki Sako, Martina Veresvarska, Simone Scaringi, Noel Castro-Segura, Christian Knigge, Keith C. Gendreau, Zaven Arzoumanian   +10 more
doaj   +1 more source

Constraining the neutrino magnetic dipole moment from white dwarf pulsations [PDF]

, 2014
Pulsating white dwarf stars can be used as astrophysical laboratories to constrain the properties of weakly interacting particles. Comparing the cooling rates of these stars with the expected values from theoretical models allows us to search for ...
Althaus, Leandro G., Bertolami, Marcelo M. Miller, Córsico, Alejandro H., García-Berro, Enrique, Kepler, S. O.   +4 more
core   +4 more sources

Spectroscopic diagnostics of dust formation and evolution in classical nova ejecta [PDF]

, 2018
A fraction of classical novae form dust during the early stages of their outbursts. The classical CO nova V5668 Sgr (Nova Sgr. 2015b) underwent a deep photometric minimum about 100 days after outburst that was covered across the spectrum. A similar event
Aquino, Ivan De Gennaro, Kuin, N. Paul, Mason, Elena, Shore, Steven N.   +3 more
core   +3 more sources

Asteroseismology

, 2012
Asteroseismology is the determination of the interior structures of stars by using their oscillations as seismic waves. Simple explanations of the astrophysical background and some basic theoretical considerations needed in this rapidly evolving field ...
A Baglin, A Gautschy, A Miglio, A Mukadam, AA Pamyatnykh, AB Kaye, AJ Brickhill, AU Landolt, B Mosser, C Aerts, C Aerts, C Waelkens, C Waelkens, D Kilkenny, DE Mkrtichian, DE Winget, DE Winget, DE Winget, DE Winget, DO Gough, DR Reese, DW Kurtz, DW Kurtz, DW Kurtz, EB Frost, EL Robinson, EM Green, F-L Deubner, G Handler, G Handler, G Handler, G Handler, G Maeder, G Torres, G Walker, H Bruntt, H Kjeldsen, H Saio, J Christensen-Dalsgaard, J Christensen-Dalsgaard, J Daszyńska-Daszkiewicz, J Daszyńska-Daszkiewicz, J Daszyńska-Daszkiewicz, J Goodricke, J Ridder De, J-P Montagner, JH Telting, JH Telting, JP Cox, JR Percy, L Eyer, LL Kiss, M Aizenman, M Asplund, M Suran, M Tassoul, M-A Dupret, MD Reed, MH Montgomery, MH Montgomery, N Baker, P Brassard, P Dufour, PA Woudt, PW Jones, R Samadi, RD Watson, RE Nather, RE Nather, RL Gilliland, S Frandsen, S Hekker, S Rosseland, S Talon, SO Kepler, SS Vogt, T Kallinger, TR Bedding, TR Bedding, TS Metcalfe, TS Metcalfe, WA Dziembowski, WA Dziembowski, WA Dziembowski, WA Dziembowski, WD Pesnell, WJ Chaplin, WW Campbell   +87 more
core   +1 more source

The Chemical Compositions of the Type II Cepheids -- The BL Her and W Vir Variables

, 2007
Abundance analyses from high-resolution optical spectra are presented for 19 Type II Cepheids in the Galactic field. The sample includes both short-period (BL Her) and long-period (W Vir) stars.
Berdnikov L. N., Bono G., David L. Lambert, Dean J. F., Diethelm R., Edvardsson B., Gingold R. A., Gingold R. A., Gonzalez G., Kinman T., Kraft R. P., Lloyd Evans T., Lloyd Evans T., Lloyd Evans T., McClure R. D., Rodgers A. W., Rodgers A. W., Sanwal N. N., Stobie R. S., Sunetra Giridhar, Thomas Maas, Van Winckel H., Vinko J., Wallerstein G.   +23 more
core   +1 more source

Ultraviolet spectroscopy of old novae and symbiotic stars [PDF]

The IUE spectra are presented for two old novae and for two of the symbiotic variables. Prominent emission line spectra are revealed as a continuum whose appearance is effected by the system inclination.
Ferland, G. J., Lambert, D. L., Shields, G. A., Slovak, M. H.   +3 more
core   +1 more source

Electron Temperatures and Free-Electron Energy Distributions of Nebulae from C II Dielectronic Recombination Lines

, 2012
A recently generated theoretical line list of C II dielectronic recombination lines together with observational data gathered from the literature is used to investigate the electron temperature in a range of astronomical objects, mainly planetary nebulae.
Sochi, Taha, Storey, Peter J.
core   +2 more sources

Recent progress in understanding the eruptions of classical novae [PDF]

Dramatic progress has occurred in the last two decades in understanding the physical processes and events leading up to, and transpiring during the eruption of a classical nova.
Shara, Michael M.
core   +1 more source

Nova-like variables [PDF]

On grounds of different observable characteristics five classes of nova-like objects are distinguished: the UX Ursae Majoris stars, the antidwarf novae, the DQ Herculis stars, the AM Herculis stars, and the AM Canum Venaticorum stars.
Ladous, Constanze
core   +1 more source