BM Cas – a long-period eclipsing young supergiant binary system in common envelope stage

Pustylnik, I.; Kalv, P.; Harvig, V.; Aas, T.

doi:10.1080/10556790701553532

Cited by 2 publications

(1 citation statement)

References 9 publications

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“…For example, by the presence of cool or hot spots/areas (e.g. Bopp & Noah 1980;Bell et al 1984;Pustylnik et al 2007;Samec et al 2009;Yuan 2010;Pribulla et al 2011), an asymmetric wind distribution in symbiotic binaries (e.g. Dumm et al 1999), a slopping accretion column (Andronov 1986), pulsation of binary components (Kato et al 2012;Popper 1961, and references therein), a Coriolis effect (e.g.…”

Section: Introductionmentioning

confidence: 99%

Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus

Shagatova

Skopal

2017

A&A

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Context. Light curves (LCs) of some symbiotic stars show a different slope of the ascending and descending branch of their minimum profile. The origin of this asymmetry is not understood well. Aims. We explain this effect in the ultraviolet LCs of the symbiotic binary SY Mus. Methods. We model the continuum fluxes in the spectra obtained by the International Ultraviolet Explorer at 10 wavelengths, from 1280 to 3080 Å. We consider that the white dwarf radiation is attenuated by H 0 atoms, H − ions and free electrons in the red giant wind. Variation in the nebular component is approximated by a sine wave along the orbit as suggested by spectral energy distribution models. The model includes asymmetric wind velocity distribution and the corresponding ionization structure of the binary. Results. We determined distribution of the H 0 and H + , as well as upper limits of H − and H 0 column densities in the neutral and ionized region at the selected wavelengths as functions of the orbital phase. Corresponding models of the LCs match well the observed continuum fluxes. In this way, we suggested the main UV continuum absorbing (scattering) processes in the circumbinary environment of S-type symbiotic stars. Conclusions. The asymmetric profile of the ultraviolet LCs of SY Mus is caused by the asymmetric distribution of the circumstellar matter at the near-orbital-plane area.

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Section: Introductionmentioning

confidence: 99%

Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus

Shagatova

Skopal

2017

A&A

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Interacting binaries W Serpentids and double periodic variables

Mennickent

Otero

Kołaczkowski

2015

Monthly Notices of the Royal Astronomical Society

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W Serpentids and Double Periodic Variables (DPVs) are candidates for close interacting binaries in a non-conservative evolutionary stage; while W Serpentids are defined by high-excitation ultraviolet emission lines present during most orbital phases, and by usually showing variable orbital periods, DPVs are characterized by a long photometric cycle lasting roughly 33 times the (practically constant) orbital period. We report the discovery of 7 new Galactic DPVs, increasing the number of known DPVs in our Galaxy by 50%. We find that DPVs are tangential-impact systems, i.e. their primaries have radii barely larger than the critical Lubow-Shu radius. These systems are expected to show transient discs, but we find that they host stable discs with radii smaller than the tidal radius. Among tangential-impact systems including DPVs and semi-detached Algols, only DPVs have primaries with masses between 7 and 10 M . We find that DPVs are in a Case-B mass transfer stage with donor masses between 1 and 2 M and with primaries resembling Be stars. W Serpentids are impact and non-impact systems, their discs extend until the last non-intersecting orbit and show a larger range of stellar mass and mass ratio than DPVs. Infrared photometry reveals significant color excesses in many DPVs and W Serpentids, usually larger for the latter ones, suggesting variable amounts of circumstellar matter.

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BM Cas – a long-period eclipsing young supergiant binary system in common envelope stage

Abstract: We report main results of the analysis of UBVR light curves of the long-period eclipsing binary BM Cas obtained between 1967 and 1996 in Tallinn observatory. The orbital period variations, evolutionary stage, peculiarities of the light curves and colour variations are discussed.

Cited by 2 publications

References 9 publications

Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus

Wind asymmetry imprint in the UV light curves of the symbiotic binary SY Mus

Interacting binaries W Serpentids and double periodic variables

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