On the Sw Sex-Type Eclipsing Cataclysmic Variable Sdss0756+0858

Tovmassian, G.; Hernández, M. S.; González–Buitrago, D.; Zharikov, S. V.; García-Díaz, Maria Teresa

doi:10.1088/0004-6256/147/3/68

Cited by 17 publications

(28 citation statements)

References 32 publications

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“…We confirm the eclipsing nature of SDSS J0756 (197.154 min), which was recently discovered by Tovmassian et al (2014). Along with SDSS J0750 (134.158 min) and the seven systems considered in Littlefair et al (2008), they form a sequence which would allow the physical properties of short-period CVs to be empirically defined as a function of orbital period.…”

Section: Discussionsupporting

confidence: 80%

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Orbital periods of cataclysmic variables identified by the SDSS

Southworth

Tappert

Gänsicke

et al. 2014

A&A

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Section: Discussionsupporting

confidence: 80%

“…A detailed photometric and spectroscopic study of this object was presented by Tovmassian et al (2014) whilst the current work was nearing completion. Their orbital period measurement is in good agreement with our own.…”

Section: Four New Eclipsing Cataclysmic Variablesmentioning

confidence: 91%

Orbital periods of cataclysmic variables identified by the SDSS

Southworth

Tappert

Gänsicke

et al. 2014

A&A

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“…Dhillon et al (1997Dhillon et al ( , 2013 supposed that the dominance of the single-peaked line emission from the hot spot over the weak double-peaked disk emission leads to the strange single-peaked lines of the SW Sex-type spectra and their radial velocity curves following the motion of the bright spot. The different amplitudes of the radial velocities of the different emission lines are another confirmation of this conclusion (Tovmassian et al 2014). The almost single-peaked emission profiles of J2256 imply considerable hot-spot contribution.…”

Section: Analysis Of the Spectral Data And Sw Sex Classification Of Jsupporting

confidence: 53%

2MASS J22560844+5954299: the newly discovered cataclysmic star with the deepest eclipse

Kjurkchieva

Khruzina

Dimitrov

et al. 2015

A&A

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Context. The SW Sex stars are assumed to represent a distinguished stage in cataclysmic variable (CV) evolution, making it especially important to study them. Aims. We discovered a new cataclysmic star and carried out prolonged and precise photometric observations, as well as mediumresolution spectral observations. Modelling these data allowed us to determine the physical parameters and to establish its peculiarities. Methods. To obtain a light curve solution we used model whose emission sources are a white dwarf surrounded by an accretion disk with a hot spot, a gaseous stream near the disk's lateral side, and a secondary star filling its Roche lobe. The obtained physical parameters are compared with those of other SW Sex-subtype stars. Results. The newly discovered cataclysmic variable 2MASS J22560844+5954299 shows the deepest eclipse amongst the known nova-like stars. It was reproduced by totally covering a very luminous accretion disk by a red secondary component. The temperature distribution of the disk is flatter than that of steady-state disk. The target is unusual with the combination of a low mass ratio q ∼ 1.0 (considerably below the limit q = 1.2 of stable mass transfer of CVs) and an M-star secondary. The intensity of the observed three emission lines, Hα, He 5875, and He 6678, sharply increases around phase 0.0, accompanied by a Doppler jump to the shorter wavelength. The absence of eclipses of the emission lines and their single-peaked profiles means that they originate mainly in a vertically extended hot-spot halo. The emission Hα line reveals S-wave wavelength shifts with semi-amplitude of around 210 km s −1 and phase lag of 0.03. Conclusions. The non-steady-state emission of the luminous accretion disk of 2MASS J22560844+5954299 was attributed to the low viscosity of the disk matter caused by its unusually high temperature. The star shows all spectral properties of an SW Sex variable apart from the 0.5 central absorption.

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“…In order to reproduce the observed light curve of SWIFT J1753.5-0127 in terms of shape and amplitude, we adopted the modelling technique from Zharikov et al (2013) and Tovmassian et al (2014). A simple geometrical model of SWIFT J1753.5-0127, presented in Fig.…”

Section: Appendix A: Brief Description Of the Light-curve Simulationsmentioning

confidence: 99%

Spectroscopic evidence for a low-mass black hole in SWIFT J1753.5−0127

Neustroev

Veledina

Poutanen

et al. 2014

Monthly Notices of the Royal Astronomical Society

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The black hole (BH) candidate SWIFT J1753.5-0127 has remained active since the onset of its 2005 outburst. Emission lines in the optical spectrum were observed at the very beginning of the outburst, but since then the spectrum has been featureless making a precise BH mass estimation impossible. Here we present results from our optical and ultraviolet (UV) observations of SWIFT J1753.5-0127 taken in 2012-2013. Our new observations show extremely broad, double-peaked emission lines in the optical and UV spectra. The optical data also show narrow absorption and emission features with nearly synchronous and significant Doppler motions. A radial velocity study of these lines which we associate with the secondary star, yields a semi-amplitude of K 2 =382 km s −1 . A time-series analysis of the spectral and photometric data revealed a possible orbital periodicity of 2.85 h, significantly shorter than the reported 3.2 h periodic signal by Zurita et al. The observed variability properties argue against a low orbital inclination angle and we present several observational arguments in favour of the BH interpretation. However, the measured radial velocity semi-amplitude of the donor star and the short orbital period imply that SWIFT J1753.5-0127 has one of the lowest measured mass function for a BH in a low-mass X-ray binary. We show that the compact object mass in excess of 5 M ⊙ is highly improbable. Thus, SWIFT J1753.5-0127 is a BH binary that has one of the shortest orbital period and hosts probably one of the smallest stellar mass BH found to date.

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On the Sw Sex-Type Eclipsing Cataclysmic Variable Sdss0756+0858

Cited by 17 publications

References 32 publications

Orbital periods of cataclysmic variables identified by the SDSS

Orbital periods of cataclysmic variables identified by the SDSS

2MASS J22560844+5954299: the newly discovered cataclysmic star with the deepest eclipse

Spectroscopic evidence for a low-mass black hole in SWIFT J1753.5−0127

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