Zobrazeno 1 - 10
of 46
pro vyhledávání: '"Falcon, Ross E."'
Autor:
Schaeuble, Marc, Falcon, Ross E., Gomez, Thomas A., Winget, Don E., Montgomery, Michael H., Bailey, James E.
We present preliminary results of an experimental study exploring helium at photospheric conditions of white dwarf stars. These data were collected at Sandia National Laboratories' Z-machine, the largest x-ray source on earth. Our helium results coul
Externí odkaz:
http://arxiv.org/abs/1610.03741
Autor:
Falcon, Ross E., Bailey, J. E., Gomez, T. A., Schaeuble, M., Nagayama, T., Montgomery, M. H., Winget, D. E., Rochau, G. A.
As part of our laboratory investigation of the theoretical line profiles used in white dwarf atmosphere models, we extend the electron-density ($n_{\rm e}$) range measured by our experiments to higher densities (up to $n_{e}\sim80\times10^{16}$ cm$^{
Externí odkaz:
http://arxiv.org/abs/1609.09101
Publikováno v:
2016, The Astrophysical Journal, 817, 27
Hot white dwarfs with carbon-dominated atmospheres (hot DQs) are a cryptic class of white dwarfs. In addition to their deficiency of hydrogen and helium, most of these stars are highly magnetic, and a large fraction vary in luminosity. This variabili
Externí odkaz:
http://arxiv.org/abs/1511.08834
Autor:
Falcon, Ross E., Rochau, G. A., Bailey, J. E., Gomez, T. A., Montgomery, M. H., Winget, D. E., Nagayama, T.
We spectroscopically measure multiple hydrogen Balmer line profiles from laboratory plasmas to investigate the theoretical line profiles used in white dwarf atmosphere models. X-ray radiation produced at the Z Pulsed Power Facility at Sandia National
Externí odkaz:
http://arxiv.org/abs/1505.03801
Autor:
Falcon, Ross E., Rochau, G. A., Bailey, J. E., Gomez, T. A., Montgomery, M. H., Winget, D. E., Nagayama, T.
Our preliminary results from laboratory experiments studying white dwarf (WD) photospheres show a systematic difference between experimental plasma conditions inferred from measured H$\beta$ absorption line profiles versus those from H$\gamma$. One h
Externí odkaz:
http://arxiv.org/abs/1410.4215
Autor:
Szkody, Paula, Mukadam, Anjum S., Gaensicke, Boris T., Henden, Arne, Sion, Edward M., Townsley, Dean M., Christian, Damian, Falcon, Ross E., Pyrzas, Stylianos, Brown, Justin, Funkhouser, Kelsey
Hubble Space Telescope spectra obtained in 2010 and 2011, three and four years after the large amplitude dwarf nova outburst of V455 And, were combined with optical photometry and spectra to study the cooling of the white dwarf, its spin, and possibl
Externí odkaz:
http://arxiv.org/abs/1309.1217
Autor:
Williams, Kurtis A., Winget, D. E., Montgomery, M. H., Dufour, Patrick, Kepler, S. O., Hermes, J. J., Falcon, Ross E., Winget, K. I., Bolte, Michael, Rubin, K. H. R.
Publikováno v:
ApJ 769 (2013) 123
We present the discovery of photometric variability in the DQ white dwarf SDSS J103655.39+652252.2 (SDSS J1036+6522). Time-series photometry reveals a coherent monoperiodic modulation at a period of 1115.64751(67) s with an amplitude of 0.442% +/- 0.
Externí odkaz:
http://arxiv.org/abs/1304.3165
Autor:
Falcon, Ross E., Rochau, G. A., Bailey, J. E., Ellis, J. L., Carlson, A. L., Gomez, T. A., Montgomery, M. H., Winget, D. E., Chen, E. Y., Gomez, M. R., Nash, T. J.
We present an experimental platform for measuring hydrogen Balmer emission and absorption line profiles for plasmas with white dwarf (WD) photospheric conditions (T_e ~ 1 eV, n_e ~ 10^17 cm^-3). These profiles will be used to benchmark WD atmosphere
Externí odkaz:
http://arxiv.org/abs/1210.7197
Autor:
Falcon, Ross E., Rochau, G. A., Bailey, J. E., Ellis, J. L., Carlson, A. L., Gomez, T. A., Montgomery, M. H., Winget, D. E., Chen, E. Y., Gomez, M. R., Nash, T. J., Pille, T. M.
Astrophysics experiments by Falcon et al. to create white dwarf photospheres in the laboratory are currently underway. The experimental platform measures Balmer line profiles of a radiation-driven, pure hydrogen plasma in emission and in absorption f
Externí odkaz:
http://arxiv.org/abs/1210.0832
We measure apparent velocities (v_app) of absorption lines for 36 white dwarfs (WDs) with helium-dominated atmospheres -- 16 DBAs and 20 DBs -- using optical spectra taken for the European Southern Observatory SN Ia progenitor survey (SPY). We find a
Externí odkaz:
http://arxiv.org/abs/1208.2009