Browsing by Author "Schmidtobreick, L"

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    Photographic surface photometry of the Southern Milky Way - VIII. High-resolution U, V and R surface photometries of the Southern Milky Way
    (1998) Hoffmann, B; Tappert, C; Schlosser, W; Schmidt-Kaler, T; Kimeswenger, S; Seidensticker, K; Schmidtobreick, L; Hovest, W
    We present photometries of the Southern Milky Way (l = 200 degrees... 0 degrees... 60 degrees, \b\ less than or equal to 40 degrees) in the U, V and R-passbands. The resolution is 0.25" x 0.25". Together with the B-photometry (Kimeswenger et al. 1993 = Paper VII), this paper gives final results of the Bochum Super-Wide-Angle-Camera photographs obtained in 1971 at La Silla, calibrated by means of accompanying photoelectric observations. The techniques employed and procedures used for the reductions are the same as described in Paper VIII and the references quoted therein. Therefore, this paper is restricted to those points, where either modifications proved to be necessary or additional information will help to judge the accuracy obtained. For this purpose, the chapters are arranged in the same manner as in Paper VII.
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    Spectroscopic analysis of tremendous-outburst-nova candidates
    (2005) Schmidtobreick, L; Tappert, C; Bianchini, A; Mennickent, RE
    In the course of a long-term project investigating classical novae with large outburst amplitudes, we have performed optical spectroscopy of several old-nova candidates. We here present the spectra of the candidates V630 Sgr, XXTau, CQVel, V842 Cen, and V529 Ori, that hitherto lacked such classification. While the first four show spectra typical of cataclysmic variables and can thus be identified as such, V529 Ori is probably misclassified. Of special interest are the two systems XXTau and V842 Cen, which show signs of being low mass transfer systems. As such they can be used to judge the evolution scenarios for novae. In particular, given the rather young age of their outbursts, it appears more likely that these systems are not on their way into hibernation (i.e., cutting off mass transfer for a longer period of time), but are simply settling down towards their original configuration of comparatively low, but steady, mass transfer, such as for dwarf novae.
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    Spectroscopic classification of cataclysmic variable candidates
    (2005) Schmidtobreick, L; Galli, L; Whiting, A; Tappert, C; Carver, AJ
    We present low-resolution optical spectroscopy for six cataclysmic variable candidates and the old nova V888 Cen. We confirm the classification as cataclysmic variable for LB 9963 and FQ Mon, while the other four candidates turn out to be different types of stars. We discuss the individual spectra and pay special attention to the mass transfer rate and disk temperature and density of the three cataclysmic variables.