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dc.contributor.authorØstensen, R.
dc.contributor.authorSolheim, Jan Erik
dc.contributor.authorJohannessen, F.
dc.date.accessioned2009-08-14T09:25:35Z
dc.date.available2009-08-14T09:25:35Z
dc.date.issued2001-10-09
dc.description.abstractWe report the discovery of an eclipsing binary – HS 0705+6700 – being an sdB star with a faint companion. From its light curve the orbital period of 8263.87 s, the mass ratio of the system q = 0.28, the inclination of 84.◦4 and other system parameters are derived. The companion does not contribute to the optical light of the system except through a strong reflection effect. The semiamplitude of the radial velocity curve K1 = 85.8 kms−1 and a mass function of f(m) = 0.00626M⊙ are determined. A spectroscopic analysis of the blue spectra results in Teff = 28 800K, log g = 5.40, and log(nHe/nH) = −2.68. These characteristics are typical for sdB stars, as is its mass of 0.48M⊙. According to its mass (0.13M⊙) and radius (0.19R⊙), the companion is an M dwarf. The primary is in a core helium burning phase of evolution, and the system must have gone through a common envelope stage when the primary was near the tip of the red giant branch.en
dc.descriptionThis is the authors' manuscripten
dc.format.extent892808 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.citationAstronomy and Astrophysicsen
dc.identifier.urihttps://hdl.handle.net/10037/2040
dc.identifier.urnURN:NBN:no-uit_munin_1792
dc.language.isoengen
dc.rights.accessRightsopenAccess
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430::Astrophysics, astronomy: 438en
dc.subjectsubdwarfs – binariesen
dc.subjectspectroscopic – starsen
dc.subjectearly-type – starsen
dc.subjectfundamental parameters – starsen
dc.subjecteclipsing – binariesen
dc.subjectindividual: HS 0705+6700en
dc.titleHS 0705+6700: a new eclipsing sdB binaryen
dc.typeJournal articleen
dc.typeTidsskriftartikkelen


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