Beuermann, Klaus Peter

[["dc.bibliographiccitation.firstpage","143"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","New Astronomy Reviews"],["dc.bibliographiccitation.lastpage","148"],["dc.bibliographiccitation.volume","44"],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","van Teeseling, A."],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","Reinsch, K."],["dc.date.accessioned","2018-11-07T11:25:18Z"],["dc.date.available","2018-11-07T11:25:18Z"],["dc.date.issued","2000"],["dc.description.abstract","Recent observational results on supersoft X-ray binaries are reviewed, with emphasis on the galactic source QR And and on the enigmatic LMC source RX J0439.8-6809. (C) 2000 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S1387-6473(00)00028-2"],["dc.identifier.isi","000090017800026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/56592"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.publisher.place","Oxford"],["dc.relation.conference","Cataclysmic Variables: a 60th Birthday Symposium in Honour of Brian Warner"],["dc.relation.eventlocation","OXFORD UNIV, OXFORD, ENGLAND"],["dc.relation.issn","1387-6473"],["dc.title","Supersoft X-ray binaries: an observational update"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","L141"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","The Astrophysical Journal Letters"],["dc.bibliographiccitation.lastpage","L144"],["dc.bibliographiccitation.volume","613"],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","Jordan, S."],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","de Martino, Domitilla"],["dc.contributor.author","Szkody, P."],["dc.contributor.author","Marsh, T. R."],["dc.contributor.author","Thorstensen, J."],["dc.date.accessioned","2018-11-07T10:44:59Z"],["dc.date.available","2018-11-07T10:44:59Z"],["dc.date.issued","2004"],["dc.description.abstract","We report the detection of Zeeman-split Lyalpha absorption pi and sigma(+) lines in the far-ultraviolet Hubble Space Telescope/Space Telescope Imaging Spectrograph (STIS) spectrum of the magnetic cataclysmic variable RX J1554.2 + 2721. Fitting the STIS data with magnetic white dwarf model spectra, we derive a field strength of B similar or equal to 144 MG and an effective temperature of 17,000 K less than or similar to T-eff less than or similar to 23,000 K. This measurement makes RX J1554.2 + 2721 only the third cataclysmic variable containing a white dwarf with a field exceeding 100 MG. Similar to the other high-field polar AR UMa, RX J1554.2 + 2721 is often found in a state of feeble mass transfer, which suggests that a considerable number of high-field polars may still remain undiscovered."],["dc.identifier.doi","10.1086/425141"],["dc.identifier.isi","000224303300015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/47397"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1538-4357"],["dc.relation.issn","0004-637X"],["dc.title","A 150 MG magnetic white dwarf in the cataclysmic variable RX J1554.2+2721"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","490"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.lastpage","500"],["dc.bibliographiccitation.volume","356"],["dc.contributor.author","Kube, Jennifer"],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","Beuermann, Klaus"],["dc.date.accessioned","2018-11-07T09:08:30Z"],["dc.date.available","2018-11-07T09:08:30Z"],["dc.date.issued","2000"],["dc.description.abstract","We present a new method to map the surface brightness of the accretion streams in AM Herculis systems from observed light curves. Extensive tests of the algorithm show that it reliably reproduces the intensity distribution of the stream for data with a signal-to-noise ratio greater than or similar to 5. As a first application, we map the accretion stream emission of C IV lambda 1550 in the polar UZ Fornacis using HST FOS high state spectra. We find three main emission regions along the accretion stream: (1) On the ballistic part of the accretion stream, (2) on the magnetically funneled stream near the primary accretion spot, and (3) on the magnetically funneled stream at a position above the stagnation region."],["dc.identifier.isi","000087182700015"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26045"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation.issn","0004-6361"],["dc.title","Eclipse mapping of the accretion stream in UZ Fornacis"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","605"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.lastpage","609"],["dc.bibliographiccitation.volume","354"],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","de Martino, Domitilla"],["dc.contributor.author","Thomas, H. C."],["dc.date.accessioned","2018-11-07T10:13:59Z"],["dc.date.available","2018-11-07T10:13:59Z"],["dc.date.issued","2000"],["dc.description.abstract","We present low-state IUE spectroscopy of the ROSAT-discovered polar RXJ1313.2-3259. The SWP spectrum displays a broad Ly alpha absorption profile, which can be fitted with a two-temperature model of a white dwarf of T(wd) = 15 000 K with a hot spot of T(spot) = 34 000 K which covers f similar to 0.01 of the white dwarf surface. The white dwarf temperature is atypically low for the long orbital period (4.18 h) of RXJ1313.2-3259. This low temperature implies either that the system is a young CV in the process of switching on mass transfer or that it is an older CV found in a prolonged state of low accretion rate, much below that predicted by standard evolution theory. In the first case, we can put a lower limit on the life time as pre-CV of 10(8) yrs. In the second case, the good agreement of the white dwarf temperature with that expected from compressional heating suggests that the system has experienced the current low accretion rate for an extended period > 10(4) yrs. A possible explanation for the low accretion rate is that RXJ1313.2-3259 is a hibernating post nova and observational tests are suggested."],["dc.identifier.isi","000085921500026"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40535"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation.issn","0004-6361"],["dc.title","RX J1313.2-3259, a missing link in CV evolution?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","L79"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.lastpage","L82"],["dc.bibliographiccitation.volume","356"],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","Fried, R. E."],["dc.contributor.author","Hagen, H. J."],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","Engels, D."],["dc.contributor.author","Hessman, Frederic V."],["dc.contributor.author","Nogami, D."],["dc.contributor.author","Reinsch, K."],["dc.date.accessioned","2018-11-07T10:37:35Z"],["dc.date.available","2018-11-07T10:37:35Z"],["dc.date.issued","2000"],["dc.description.abstract","We report on follow-up spectroscopy and photometry of the cataclysmic variable candidate HS 0907+1902 selected from the Hamburg Quasar Survey. B, V, and R photometry obtained during the first observed outburst of HS 0907+1902 (V approximate to 13) reveals deep eclipses (Delta V approximate to 2.1 - 2.8) and an orbital period P(orb) = 4.2 h with the eclipse depth decreasing to the red. The outburst eclipse profiles are symmetric, indicating an axisymmetrical brightness distribution in the accretion disc. We derive an inclination i approximate to 73 degrees - 79 degrees from the eclipse duration. The quiescent spectrum obtained with the Hobby-Eberly Telescope shows double peaked emission lines of H I, He I and Fe I,II and clearly identifies the system as a dwarf nova. Absorption features of the secondary star are detected at red wavelengths from which a spectral class M3 +/- 1.5 and a distance of d = 320 +/- 100 pc are derived."],["dc.identifier.isi","000087446700005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45601"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","0004-6361"],["dc.title","HS 0907+1902: a new 4.2 hr eclipsing dwarf nova"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","589"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.lastpage","601"],["dc.bibliographiccitation.volume","622"],["dc.contributor.author","Araujo-Betancor, S."],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","Long, K. S."],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","de Martino, Domitilla"],["dc.contributor.author","Sion, E. M."],["dc.date.accessioned","2018-11-07T11:15:34Z"],["dc.date.available","2018-11-07T11:15:34Z"],["dc.date.issued","2005"],["dc.description.abstract","We have obtained Hubble Space Telescope (HST) STIS data for a total of 11 polars as part of a program aimed at compiling a homogeneous database of high-quality far-ultraviolet (FUV) spectra for a large number of cataclysmic variables (CVs). Of the 11 polars, eight were found in a state of low accretion activity (V347 Pav, VV Pup, V834 Cen, BL Hyi, MR Ser, ST LMi, RX J1554.2+2721, and V895 Cen) and three in a state of high activity ( CD Ind, AN UMa, and UW Pic). The STIS spectra of the low-state polars unambiguously reveal the photospheric emission of their white dwarf (WD) primaries. We have used pure hydrogen WD models to fit the FUV spectra of the low-state systems (except RX J1554.2+2721, which is a high-field polar) in order to measure the WD effective temperatures. In all cases, the fits could be improved by adding a second component, which is presumably due to residual accretion onto the magnetic pole of the WD. The WD temperatures obtained range from 10,800 to 14,300 K for log g = 8.0. Our analysis more than doubles the number of polars with accurate WD effective temperatures. Comparing the WD temperatures of polars with those of nonmagnetic CVs, we find that at any given orbital period the WDs in polars are colder than those in nonmagnetic CVs. The temperatures of polars below the period gap are consistent with gravitational radiation as the only active angular momentum loss mechanism. The differences in WD effective temperatures between polars and nonmagnetic CVs are significantly larger above the period gap, suggesting that magnetic braking in polars might be reduced by the strong field of the primary. We derive distance estimates to the low-state systems from the flux scaling factors of our WD model fits. Combining these distance measurements with those from the literature, we establish a lower limit on the space density of polars of 1.3 x 10(-6) pc(-3)."],["dc.identifier.isi","000227740900050"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/54392"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","0004-637X"],["dc.title","Far-ultraviolet spectroscopy of magnetic cataclysmic variables"],["dc.type","review"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","443"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","The Astrophysical Journal"],["dc.bibliographiccitation.lastpage","448"],["dc.bibliographiccitation.volume","594"],["dc.contributor.author","Gansicke, B. T."],["dc.contributor.author","Szkody, P."],["dc.contributor.author","De Martino, D."],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","Long, K. S."],["dc.contributor.author","Sion, E. M."],["dc.contributor.author","Knigge, C."],["dc.contributor.author","Marsh, Tom"],["dc.contributor.author","Hubeny, I."],["dc.date.accessioned","2018-11-07T10:36:19Z"],["dc.date.available","2018-11-07T10:36:19Z"],["dc.date.issued","2003"],["dc.description.abstract","Brief Hubble Space Telescope Space Telescope Imaging Spectrograph spectroscopic snapshot exposures of the cataclysmic variables 1RXS J232953.9+062814, CE 315, BZ UMa, and EY Cyg reveal very large N v/C IV line flux ratios, similar to those observed in AE Aqr. Such anomalous line flux ratios have so far been observed in 10 systems and presumably reflect a different composition of the accreted material compared to the majority of cataclysmic variables. We discuss the properties of this small sample in the context of the recent proposal by Schenker et al. that a significant fraction of the present-day population of cataclysmic variables may have passed through a phase of thermal timescale mass transfer."],["dc.identifier.doi","10.1086/376902"],["dc.identifier.isi","000185087400035"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/45293"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation.issn","1538-4357"],["dc.relation.issn","0004-637X"],["dc.title","Anomalous ultraviolet line flux ratios in the cataclysmic variables 1RXS J232953.9+062814, CE 315, BZ Ursae Majoris, and EY Cygni, observed with the Hubble Space Telescope space telescope imaging spectrograph"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","L49"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Astronomy and Astrophysics"],["dc.bibliographiccitation.lastpage","L52"],["dc.bibliographiccitation.volume","354"],["dc.contributor.author","Beuermann, Klaus"],["dc.contributor.author","Wheatley, P."],["dc.contributor.author","Ramsay, G."],["dc.contributor.author","Euchner, F."],["dc.contributor.author","Gansicke, B. T."],["dc.date.accessioned","2018-11-07T10:14:39Z"],["dc.date.available","2018-11-07T10:14:39Z"],["dc.date.issued","2000"],["dc.description.abstract","Low-state spectrophotometry of the short-period polar EF Eridani (P(orb)= 81 min) found the system at V = 18.0 with no trace of the companion (Wheatley and Ramsay 1998). We show that the lack of such spectral features implies that the companion to the white dwarf in EF Eri has a spectral type later than M9 and is either a transition object at the brink of hydrogen burning or a brown dwarf. The optical low state spectrum indicates a temperature of the white dwarf of T(eff)= 9500 +/- 500 K. This is one of the coldest white dwarfs in cataclysmic variables, implying a cooling age t(cool) greater than or equal to 10(9) yrs or accretional heating at a rate as given by gravitational radiation. The large age of the system excludes a warm brown dwarf as companion. EF Eri has either just passed through the period minimum of cataclysmic variable stars or has started mass transfer from an old brown dwarf secondary."],["dc.identifier.isi","000085955700013"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40658"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Edp Sciences S A"],["dc.relation.issn","0004-6361"],["dc.title","Evidence for a substellar secondary in the magnetic cataclysmic binary EF Eridani"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.subtype","letter_note"],["dspace.entity.type","Publication"]]