Greiner, J., Schwarz, R., Tappert, C., Mennickent, R. E., Reinsch, K., Sala, G.
We summarize our optical monitoring program of VY Scl stars with the SMARTS telescopes, and triggered X-ray as well as optical observations after/during state transitions of V504 Cen and VY Scl.
Observations of three pre-cataclysmic variables from the Edinburgh-Cape Blue Object Survey (2009)
Tappert, C., Gaensicke, B. T., Zorotovic, M., Toledo, I., Southworth, J., Papadaki, C., ...
We present light curves and time-resolved spectroscopy of the three candidate pre-cataclysmic binaries EC 12477-1738, EC 13349-3237, and EC 14329-1625. We determine the orbital period for EC...
A dusty component to the gaseous debris disk around the white dwarf SDSS J1228+1040 (2009)
Brinkworth, C. S., Gänsicke, B. T., Marsh, T. R., Hoard, D. W., Tappert, C.
We present Infrared Spectrometer And Array Camera (ISAAC) spectroscopy and ISAAC, UKIDSS, and Spitzer Space Telescope broadband photometry of SDSS J1228+1040—a white dwarf for which evidence of a...
A Dusty Component to the Gaseous Debris Disk around the White Dwarf SDSS J1228+1040 (2009)
Brinkworth, C. S., Gaensicke, B. T., Marsh, T. R., Hoard, D. W., Tappert, C.
We present ISAAC spectroscopy and ISAAC, UKIDSS and Spitzer Space Telescope broad-band photometry of SDSS J1228+1040 -- a white dwarf for which evidence of a gaseous metal-rich circumstellar disk has...
RR Pictoris: an old nova showing superhumps and QPOs (2008)
Schmidtobreick, L., Papadaki, C., Tappert, C., Ederoclite, A.
We present time-resolved V-photometry of the old nova RR Pic. Apart from the hump-like variability, the light curves show the strong flickering and random variation typical for RR Pic. We do not find...
NSV 13983: A New Dwarf Nova in the Period Gap (2008)
Aims. NSV 13983 is catalogued as a dwarf nova based on a reported outburst from 2005. The system has not yet been studied spectroscopically. We attempt to confirm its nature as a dwarf nova and...
The remarkable properties of the symbiotic star AE Circinus (2008)
Mennickent, R., Greiner, J., Arenas, J., Tovmassian, G., Mason, E., Tappert, C., ...
The remarkable properties of the symbiotic star AE Circinus (2007)
Mennickent, R. E., Greiner, J., Arenas, J., Tovmassian, G., Mason, E., Tappert, C., ...
We present new optical spectroscopy and photometry, 2MASS infrared observations and 24 years of combined AAVSO and AFOEV photometry of the symbiotic star candidate \ae. The long-term light curve is...
The pre-cataclysmic variable, LTT560 (2007)
Tappert, C., Gaensicke, B. T., Schmidtobreick, L., Aungwerojwit, A., Mennickent, R. E., Koester, D.
System parameters of the object LTT560 are determined in order to clarify its nature and evolutionary status. We apply time-series photometry to reveal orbital modulations of the light curve,...
K-band spectroscopy of pre-cataclysmic variables (2007)
Tappert, C., Gaensicke, B. T., Schmidtobreick, L., Mennickent, R. E., Navarrete, F. P.
We have taken K-band spectroscopy of a sample of 13 pre-CVs in order to examine them for anomalous chemical abundances. In particular, we study the strength of the 12CO and 13CO absorption bands that...
The emission line galaxy TV Reticuli: Evidence for an ultraluminous supernova (2006)
Schmidtobreick, L., Tappert, C., Horst, H., Saviane, I., Lidman, C.
TV Ret was classified as a cataclysmic variable due to an outburst observed in 1977. We intended to confirm this classification and derive some basic properties of the system. Low resolution optical...
AD Mensae: a dwarf nova in the period gap (2006)
Schmidtobreick, L., Tappert, C.
AD Men was classified as a probable long-period dwarf nova based on its long-term variability. Recent spectroscopic data instead suggested a short-period system. With the here presented observations...
Spectroscopy of the candidate pre-CV LTT 560 (2006)
Tappert, C., Gaensicke, B. T., Mennickent, R. E., Schmidtobreick, L.
We present preliminary results on spectroscopic data of the candidate pre-cataclysmic variable LTT 560. A fit to the flux-calibrated spectrum reveals the temperature of the white-dwarf primary to be...
Spectroscopic classification of cataclysmic variable candidates (2005)
Schmidtobreick, L., Galli, L., Whiting, A., Tappert, C., Carver, A. J.
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 dwarf nova RX Volantis in Quiescence (2005)
SCHMIDTOBREICK, L, TAPPERT, C, CARVER, A, Baes, Maarten, VIDAL PEREZ, E
Spectroscopic analysis of tremendous--outburst--nova candidates (2004)
Schmidtobreick, L., Tappert, C., Bianchini, A., Mennickent, R. E.
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...
Cataclysmic variables from the Calan-Tololo Survey - I. Photometric periods (2004)
Tappert, C., Augusteijn, T., Maza, José
In a search for cataclysmic variables in the Calan-Tololo Survey, we have detected 21 systems, 16 of them previously unknown. In this paper we present detailed time-series photometry for those six...
IR spectroscopy of pre-cataclysmic binaries (2004)
Tappert, C., Gaensicke, B. T., Mennickent, R. E.
We have taken near-infrared (JHK) spectroscopic data of a sample of pre-CVs, in order to examine them for signatures of nuclear evolution. Here we present preliminary results for the three systems...
Cataclysmic variables from the Calan-Tololo-Survey -- I. Photometric periods (2004)
Tappert, C., Augusteijn, T., Maza, J.
In a search for cataclysmic variables in the Calan-Tololo Survey we have detected 21 systems, 16 of them previously unknown. In this paper we present detailed time-series photometry for those six...
Bianchini , A., Mennickent , R. E., Schmidtobreick , L., Tappert , C.
Durante un proyecto a largo plazo dedicado a la investigación de novas clásicas con explosiones de grandes amplitudes hemos llevado a cabo fotometría a múltiples longitudes de onda y...
Spectroscopy of old nova candidates (2004)
A. Bianchini, C. Tappert, L. Schmidtobreick, R. E. Mennickent
Search for brown-dwarf like secondaries in cataclysmic variables II (2003)
Mennickent, R. E., Diaz, M. P., Tappert, C.
We have examined VTL/ISAAC 1-2.5 $\umu$m spectroscopy of a sample of short orbital period cataclysmic variables which are candidates for harboring substellar companions. We provide descriptions of...
Recovery of the old nova V840 Ophiuchi: A carbon rich system (2003)
Schmidtobreick, L., Tappert, C., Bianchini, A., Mennickent, R. E.
We present optical spectroscopy and multi colour photometry of the old nova V840 Oph. We rediscovered the nova based on its position in the colour--colour diagrams. It stands out as a very blue...
An atlas of line profile studies for SU UMa type cataclysmic variables (2003)
Tappert, C., Mennickent, R. E., Arenas, J., Matsumoto, K., Hanuschik, R. W.
We present H-alpha line-profile analyses for the seven SU UMa type dwarf novae AK Cnc, WX Cet, AQ Eri, VW Hyi, RZ Leo, TU Men, and HS Vir. All data sets are treated in the same manner, applying a...
GZ Cancri: a cataclysmic variable at the lower edge of the period gap (2003)
We present calibrated photometry and time-resolved spectroscopy of the cataclysmic variable GZ Cnc. Radial velocities of the H-alpha emission line reveal an orbital period of 0.08825(28) d, or...
The emission distribution of RR Pictoris (2003)
Schmidtobreick, L., Tappert, C., Saviane, I.
We present time-resolved optical spectroscopy of the old nova RR Pic. Two emission lines (Halpha and He I) are present in the observed part of the spectrum and both show strong variability. Halpha...
On the orbital period of the cataclysmic variable V592 Herculis (2002)
Mennickent, R. E., Tappert, C., Gallardo, R., Duerbeck, H. W., Augusteijn, T.
We present a spectroscopic study of the long-recurrence-time dwarf nova V592 Herculis based on observations obtained during its August 1998 superoutburst. From the analysis of the radial velocities...
On the secondary star of the cataclysmic variable 1RXS J094432.1+035738 (2001)
Mennickent, R. E., Tovmassian, G., Zharikov, S. V., Tappert, C., Greiner, J., Gansicke, B. T., ...
We present V and Rc band photometry and optical near-infrared spectroscopy of the cataclysmic variable 1RXS J094432.1+035738. We detected features of a cool secondary star, which can be modeled with...
The cataclysmic variable CW 1045+525: a secondary-dominated dwarf nova? (2001)
Tappert, C., Thorstensen, J. R., Fenton, W. H., Bennert, N., Schmidtobreick, L., Bianchini, A.
We present spectroscopic and photometric observations of the cataclysmic variable CW 1045+525. Both the optical spectrum and the photometric lightcurve show a strong contribution of a K5V - M0V...
The Missing CV Population: Results From An Objective Prism Survey (2001)
Tappert, C., Augusteijn, T., Maza, J.
We present the results of a search for cataclysmic variables (CVs) in the Calan-Tololo survey. We detected a total number of 21 CVs, 12 of them are previously unknown objects. Our results suggest...
Is the old nova RW UMi (1956) an intermediate polar? (2001)
Bianchini, A., Tappert, C., Osborne, H., Canterna, Ronald, Tamburini, F.
From photometric observations of the old nova RW UMi (1956) we have discovered the presence of five sub-orbital periodicities. The longest period, P1 = 54.4 min, always observed, could be the beat...
On the orbital period of the cataclysmic variable RZ Leonis (2001)
Mennickent, R. E., Tappert, C.
In this research note we present a time-resolved study of the Balmer emission lines of RZ Leo. From the analysis of the radial velocities we find an orbital period of 0.07651(26) d. This is in...
Two new quasars at z=1.90 and z=0.15 from the Calan-Tololo Survey (1999)
Rossa, J., Tappert, C., Augusteijn, Th., Maza, J.
We present the discovery of two new quasars, that initially appeared as candidate cataclysmic variables (CVs) in a list of the Calan-Tololo objective prism survey. However, additional spectroscopic...