73 citations · 294 across the 17 of their papers we have counts for
17 papers
New orbital periods of high-inclination dwarf novae based on Gaia Alerts photometry
Catalina Sáez-Carvajal, Nikolaus Vogt, Mónica Zorotovic +8
The orbital period of a cataclysmic variable stands as a crucial parameter for investigating the structure and physics of these binary systems, as well as understanding their evolu…
Determination of the superoutburst cycle lengths of 206 SU UMa type dwarf novae
N. Vogt, E. C. Puebla, A. Contreras-Quijada
SU UMa stars are characterized by "superoutbursts" which are brighter at maximum light and which last much longer than the more frequent "ordinary" outbursts of these dwarf novae.…
Life after eruption VIII: The orbital periods of novae
I. Fuentes-Morales, C. Tappert, M. Zorotovic +5
The impact of nova eruptions on the long-term evolution of Cataclysmic Variables(CVs) is one of the least understood and intensively discussed topics in the field. Acrucial ingredi…
The luminosity evolution of nova shells -- I. A new analysis of old data
C. Tappert, N. Vogt, A. Ederoclite +3
We present a re-analysis of the H and [OIII] flux data from the only comprehensive study of the luminosity evolution of nova shells, undertaken almost two decades ago. We use ne…
Photometric long-term variations and superhump occurrence in the Classical Nova RR Pictoris
I. Fuentes-Morales, N. Vogt, C. Tappert +3
We present an analysis of all available time-resolved photometry from the literature and new light curves obtained in 2013-2014 for the old nova RR Pictoris. The well-known hump li…
The orbital ephemeris of the classical nova RR Pictoris: presence of a third body?
N. Vogt, M. R. Schreiber, F. -J. Hambsch +4
The ex-nova RR Pic presents a periodic hump in its light curve which is considered to refer to its orbital period. Analyzing all available epochs of these hump maxima in the litera…
Life after eruption - VI. Recovery of the old novae EL Aql, V606 Aql, V908 Oph, V1149 Sgr, V1583 Sgr and V3964 Sgr
C. Tappert, D. Barria, I. Fuentes Morales +3
We report on the recovery of the six old novae EL Aql, V606 Aql, V908 Oph, V1149 Sgr, V1583 Sgr and V3964 Sgr, using photometric and spectroscopic data. Analysing several propertie…
Life after eruption - V. Spectroscopy of eight candidate old novae with Gemini-South
C. Tappert, N. Vogt, L. Schmidtobreick +1
We present the analysis of photometric and spectroscopic data on eight candidates for post-nova systems. Five post-novae, V528 Aql, HS Sge, BS Sgr, GR Sgr and V999 Sgr, are success…
Astrometric follow-up observations of directly imaged sub-stellar companions to young stars and brown dwarfs
C. Ginski, T. O. B. Schmidt, M. Mugrauer +4
The formation of massive planetary or brown dwarf companions at large projected separations from their host star is not yet well understood. In order to put constraints on formatio…
Multiperiodic semiregular variable stars in the ASAS data base: A pilot study
I. Fuentes-Morales, N. Vogt
Based on a search for multi-periodic variability among the semi-regular red variable stars in the database of the All Sky Automated Survey (ASAS), a sample of 72 typical examples i…
Life after eruption - IV. Spectroscopy of 13 old novae
C. Tappert, N. Vogt, M. Della Valle +2
We present data on 13 post-nova systems. This includes the recovery via UBVR photometry of the five post-novae X Cir, V2104 Oph, V363 Sgr, V928 Sgr and V1274 Sgr and their spectros…
Life after eruption - II. The eclipsing old nova V728 Scorpii
C. Tappert, N. Vogt, L. Schmidtobreick +2
The old nova V728 Sco has been recently recovered via photometric and spectroscopic observations, 150 years after the nova eruption. The spectral properties pointed to a high-incli…
Astrometric confirmation of young low-mass binaries and multiple systems in the Chamaeleon star-forming regions
N. Vogt, T. O. B. Schmidt, R. Neuhäuser +4
The star-forming regions in Chamaeleon are one of the nearest (distance ~165 pc) and youngest (age ~2 Myrs) conglomerates of recently formed stars and the ideal target for populati…
Post-common-envelope binaries from SDSS. XIII: Mass dependencies of the orbital period distribution
M. Zorotovic, M. R. Schreiber, B. T. Gänsicke +11
Post-common-envelope binaries (PCEBs) consisting of a white dwarf (WD) and a main-sequence secondary star are ideal systems to constrain models of common-envelope (CE) evolution. U…
Direct detection of a substellar companion to the young nearby star PZ Telescopii
M. Mugrauer, N. Vogt, R. Neuhäuser +1
Aims: We study the formation of substellar objects (exoplanets and brown dwarfs) as companions to young nearby stars. Methods: With high contrast AO imaging obtained with NACO at E…
Orbital motion of the young brown dwarf companion TWA 5 B
R. Neuhäuser, T. O. B. Schmidt, V. V. Hambaryan +1
With more adaptive optics images available, we aim at detecting orbital motion for the first time in the system TWA 5 A+B. We measured separation and position angle between TWA 5 A…
FH Leonis, the first dwarf nova member of a multiple star system?
N. Vogt
Sudden brightenings of HD 96273 or BD+07 2411B were observed with the HIPPARCOS satellite in 1992,which still require a convincing explanation. A new analysis of all known data of…