The helium-rich cataclysmic variable SBSS 1108+574
We present time-resolved spectroscopy and photometry of the dwarf nova SBSS 1108+574, obtained during the 2012 outburst. Its quiescent spectrum is unusually rich in helium, showing broad, double-peaked emission lines from the accretion disc. We measure a line flux ratio He i 5875/Hα = 0.81 ± 0.04, a...
| Autores: | ; ; ; ; ; ; ; ; ; ; ; ; ; ; |
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| Tipo de documento: | Artículo |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Lenguaje: | Inglés |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/9595 |
| Acceso en línea: | http://hdl.handle.net/10272/9595 |
| Nivel de acceso: | Acceso abierto |
| Palabra clave: | Accretion, accretion discs Binaries: close Stars: individual: SBSS 1108+574 Novae, cataclysmic variables White dwarfs |
| _version_ | 1878740007583219712 |
|---|---|
| author | Carter, P. J. |
| author2 | Steeghs, D. Miguel Agustino, Enrique de Goff, W. Koff, Robert Krajci, Thomas Marsh, T. R. Gänsicke, B. T. Breedt, E. Groot, P. J. Nelemans, G. Roelofs, G. H. A. Rau, A. Koester, D. Kupfer, T. |
| author2_role | author author author author author author author author author author author author author author |
| author_browse | Breedt, E. Carter, P. J. Goff, W. Groot, P. J. Gänsicke, B. T. Koester, D. Koff, Robert Krajci, Thomas Kupfer, T. Marsh, T. R. Miguel Agustino, Enrique de Nelemans, G. Rau, A. Roelofs, G. H. A. Steeghs, D. |
| author_facet | Carter, P. J. Steeghs, D. Miguel Agustino, Enrique de Goff, W. Koff, Robert Krajci, Thomas Marsh, T. R. Gänsicke, B. T. Breedt, E. Groot, P. J. Nelemans, G. Roelofs, G. H. A. Rau, A. Koester, D. Kupfer, T. |
| author_role | author |
| collection | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| description | We present time-resolved spectroscopy and photometry of the dwarf nova SBSS 1108+574, obtained during the 2012 outburst. Its quiescent spectrum is unusually rich in helium, showing broad, double-peaked emission lines from the accretion disc. We measure a line flux ratio He i 5875/Hα = 0.81 ± 0.04, a much higher ratio than typically observed in cataclysmic variable stars (CVs). The outburst spectrum shows hydrogen and helium in absorption, with weak emission of Hα and He i 6678, as well as strong He ii emission. From our photometry, we find the superhump period to be 56.34 ± 0.18 min, in agreement with the previously published result. The spectroscopic period, derived from the radial velocities of the emission lines, is found to be 55.3 ± 0.8 min, consistent with a previously identified photometric orbital period, and significantly below the normal CV period minimum. This indicates that the donor in SBSS 1108+574 is highly evolved. The superhump excess derived from our photometry implies a mass ratio of q = 0.086 ± 0.014. Our spectroscopy reveals a grazing eclipse of the large outbursting disc. As the disc is significantly larger during outburst, it is unlikely that an eclipse will be detectable in quiescence. The relatively high accretion rate implied by the detection of outbursts, together with the large mass ratio, suggests that SBSS 1108+574 is still evolving towards its period minimum. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_cc09c2e1e1a8e51831065b1602154010 |
| institution | Universidad de Huelva (UHU) |
| instname_str | Universidad de Huelva (UHU) |
| language | eng |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:ariasmontano.uhu.es:10272/9595 |
| publishDate | 2013 |
| publishDateSort | 2013 |
| publisher | Oxford University Press |
| publisherStr | Oxford University Press |
| reponame_str | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| spelling | The helium-rich cataclysmic variable SBSS 1108+574 Carter, P. J. Steeghs, D. Miguel Agustino, Enrique de Goff, W. Koff, Robert Krajci, Thomas Marsh, T. R. Gänsicke, B. T. Breedt, E. Groot, P. J. Nelemans, G. Roelofs, G. H. A. Rau, A. Koester, D. Kupfer, T. Accretion, accretion discs Binaries: close Stars: individual: SBSS 1108+574 Novae, cataclysmic variables White dwarfs We present time-resolved spectroscopy and photometry of the dwarf nova SBSS 1108+574, obtained during the 2012 outburst. Its quiescent spectrum is unusually rich in helium, showing broad, double-peaked emission lines from the accretion disc. We measure a line flux ratio He i 5875/Hα = 0.81 ± 0.04, a much higher ratio than typically observed in cataclysmic variable stars (CVs). The outburst spectrum shows hydrogen and helium in absorption, with weak emission of Hα and He i 6678, as well as strong He ii emission. From our photometry, we find the superhump period to be 56.34 ± 0.18 min, in agreement with the previously published result. The spectroscopic period, derived from the radial velocities of the emission lines, is found to be 55.3 ± 0.8 min, consistent with a previously identified photometric orbital period, and significantly below the normal CV period minimum. This indicates that the donor in SBSS 1108+574 is highly evolved. The superhump excess derived from our photometry implies a mass ratio of q = 0.086 ± 0.014. Our spectroscopy reveals a grazing eclipse of the large outbursting disc. As the disc is significantly larger during outburst, it is unlikely that an eclipse will be detectable in quiescence. The relatively high accretion rate implied by the detection of outbursts, together with the large mass ratio, suggests that SBSS 1108+574 is still evolving towards its period minimum. Oxford University Press http://hdl.handle.net/10272/9595 |
| spellingShingle | The helium-rich cataclysmic variable SBSS 1108+574 Carter, P. J. Accretion, accretion discs Binaries: close Stars: individual: SBSS 1108+574 Novae, cataclysmic variables White dwarfs |
| title | The helium-rich cataclysmic variable SBSS 1108+574 |
| title_full | The helium-rich cataclysmic variable SBSS 1108+574 |
| title_fullStr | The helium-rich cataclysmic variable SBSS 1108+574 |
| title_full_unstemmed | The helium-rich cataclysmic variable SBSS 1108+574 |
| title_short | The helium-rich cataclysmic variable SBSS 1108+574 |
| title_sort | The helium-rich cataclysmic variable SBSS 1108+574 |
| topic | Accretion, accretion discs Binaries: close Stars: individual: SBSS 1108+574 Novae, cataclysmic variables White dwarfs |
| topic_facet | Accretion, accretion discs Binaries: close Stars: individual: SBSS 1108+574 Novae, cataclysmic variables White dwarfs |
| url | http://hdl.handle.net/10272/9595 |