195 citations · 513 across the 15 of their papers we have counts for
9 papers · 1 filter
New radial velocity observations of AH Her: evidence for material outside the tidal radius
J. Echevarría, J. V. Hernández Santisteban, O. Segura Montero +7
Spectroscopic observations of AH Herculis during a deep quiescent state are put forward. We found the object in a rare long minima, allowing us to derive accurately the semi-amplit…
Quest for the Donor Star in the Magnetic Precataclysmic Variable V1082 Sgr
G. Tovmassian, J. F. Gonzalez, M. -S. Hernandez +3
We obtained high-resolution spectra and multicolor photometry of V1082 Sgr to study the donor star in this 20.8 hr orbital period binary, which is assumed to be a detached system.…
From outburst to quiescence: spectroscopic evolution of V1838 Aql imbedded in a bow-shock nebula
J. V. Hernández Santisteban, J. Echevarría, S. Zharikov +15
We analyse new optical spectroscopic, direct-image and X-ray observations of the recently discovered a high proper motion cataclysmic variable V1838 Aql. The data were obtained dur…
IGR J19552+0044: A new asynchronous short period polar: "Filling the gap between intermediate and ordinary polars"
G. Tovmassian, D. Gonzalez-Buitrago, J. Thorstensen +23
Based on XMM--Newton X-ray observations IGR J19552+0044 appears to be either a pre-polar or an asynchronous polar. We conducted follow-up optical observations to identify the sourc…
ROTSE1 J164341.65+251748.1: a new W UMa-type eclipsing binary
R. Michel, J. Echevarria, T. Cang +2
ROTSE1 J164341.65+251748.1 was photometrically observed in the V band during three epochs with the 0.84-m telescope of the San Pedro Mártir Observatory in Mexico. Based on addition…
Long orbital period pre-polars containing an early K-type donor stars. Bottleneck accretion mechanism in action
G. Tovmassian, D. Gonzalez-Buitrago, S. Zharikov +6
We studied two objects identified as a Cataclysmic Variables (CVs) with periods exceeding the natural boundary for Roche lobe filling ZAMS secondary stars. We present observational…
On the SW Sex-Type Eclipsing Cataclysmic Variable SDSS0756+0858
Gagik Tovmassian, Mercedes Stephania Hernandez, Diego Gonzalez-Buitrago +2
We conducted a spectroscopic and photometric study of SDSS J075653.11+085831. X-ray observations were also attempted. We determined the orbital period of this binary system to be 3…
Periodic Radio Continuum Emission Associated with the beta Cephei Star V2187 Cyg
Mauricio Tapia, Luis F. Rodriguez, Gagik Tovmassian +4
We present new optical time-resolved photometry and medium-resolution spectroscopy of V2187 Cyg. We confirm its classification as a beta Cephei star based on sinusoidal light varia…
The accretion disk in the post period-minimum cataclysmic variable SDSS J080434.20+510349.2
S. Zharikov, G. Tovmassian, A. Aviles +3
This study of SDSS0804 is primarily concerned with the double-hump shape in the light curve and its connection with the accretion disk in this bounce-back system. Time-resolved pho…