Zobrazeno 1 - 10
of 257
pro vyhledávání: '"Beuermann, K. P."'
Autor:
Beuermann, K., Reinsch, K.
Publikováno v:
A&A, 687, A273 (2024)
We report an observed accretion rate of $\dot M_1 = (3.86\pm0.60)\times 10^{-11}$ $M_{\odot}$yr$^{-1}$ for the white dwarf in the short-period, intermediate polar EX Hya. This result is based upon the accretion-induced $4\pi$-averaged energy flux fro
Externí odkaz:
http://arxiv.org/abs/2412.13850
Autor:
Beuermann, K., Reinsch, K.
EX Hya is one of the best studied, but still enigmatic intermediate polars. We present phase-resolved blue VLT/UVES high-resolution ($\lambda/\Delta \lambda\simeq16.000$) spectra of EX Hya taken in January 2004. Our analysis involves a unique decompo
Externí odkaz:
http://arxiv.org/abs/2402.13834
Publikováno v:
A&A 657, A101 (2022)
We present a photometric study of the newly discovered eclipsing IP $J183221.56-162724.25$ (in short $J1832$) with an orbital period of $8.87hr$. The system features a box-like deep eclipse with a full width at 50% depth of $1970\pm2s$ and a large-am
Externí odkaz:
http://arxiv.org/abs/2111.02752
Publikováno v:
A&A 645, A56 (2021)
We report results on the ROSAT-discovered noneclipsing short-period polars RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925 collected over 30 years. We present accurate linear orbital ephemerides that allow a co
Externí odkaz:
http://arxiv.org/abs/2010.11678
Publikováno v:
A&A 634, A91 (2020)
We report on the X-ray observations of the eclipsing polar HY Eri (RX J0501-0359), along with its photometric, spectrophotometric, and spectropolarimetric optical variations, collected over 30 years. With an orbital period of 2.855 h, HY Eri falls ne
Externí odkaz:
http://arxiv.org/abs/2001.01967
Autor:
Toloza, O., Gaensicke, B. T., Hermes, J. J., Townsley, D. M., Schreiber, M. R., Szkody, P., Pala, A., Beuermann, K., Bildsten, L., Breedt, E., Cook, M., Godon, P., Henden, A. A., Hubeny, I., Knigge, C., Long, K. S., Marsh, T. R., de Martino, D., Mukadam, A. S., Myers, G., Nelson, P., Oksanen, A., Patterson, J., Sion, E. M., Zorotovic, M.
Non-radial pulsations have been identified in a number of accreting white dwarfs in cataclysmic variables. These stars offer insight into the excitation of pulsation modes in atmospheres with mixed compositions of hydrogen, helium, and metals, and th
Externí odkaz:
http://arxiv.org/abs/1604.02162
From 1979 to 2001, the magnetic axis of the white dwarf in the polar DP Leo slowly rotated by 50 deg in azimuth, possibly indicating a small asynchronism between the rotational and orbital periods of the magnetic white dwarf. We have obtained phase-r
Externí odkaz:
http://arxiv.org/abs/1401.1638
Autor:
Beuermann, K., Dreizler, S., Hessman, F. V., Backhaus, U., Boesch, A., Husser, T. -O., Nortmann, L., Schmelev, A., Springer, R.
Publikováno v:
Astronomy & Astrophysics 10/2013, Volume 558, id.A96, 6 pp
We report photometric observations of the eclipsing close binary CSS21055 (SDSS J141126+200911) that strongly suggest that the companion to the carbon-oxygen white dwarf is a brown dwarf with a mass between 0.030 and 0.074 Msun. The measured orbital
Externí odkaz:
http://arxiv.org/abs/1312.5088
We report optical and X-ray observations of the high-field polar RXJ1007.5-2017 performed between 1990 and 2012. It has an orbital period of 208.60 min determined from the ellipsoidal modulation of the secondary star in an extended low state. The spe
Externí odkaz:
http://arxiv.org/abs/1209.2838
We report new mid-eclipse times of the short-period sdB/dM binary HW Vir, which differ substantially from the times predicted by a previous model. The proposed orbits of the two planets in that model are found to be unstable. We present a new secular
Externí odkaz:
http://arxiv.org/abs/1206.3080