Tidal Synchronisation Of The Subdwarf B Binary Pg 0101+039

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dc.contributor.utaustinauthorEdelmann, H.en_US
dc.creatorGeier, S.en_US
dc.creatorNesslinger, S.en_US
dc.creatorHeber, U.en_US
dc.creatorRandall, S. K.en_US
dc.creatorEdelmann, H.en_US
dc.creatorGreen, E. M.en_US
dc.date.accessioned2016-04-22T19:46:48Z
dc.date.available2016-04-22T19:46:48Z
dc.date.issued2008-01en
dc.description.abstractAims. Tidally locked rotation is a frequently applied assumption that helps to measure masses of invisible compact companions in close binaries. The calculations of synchronisation times are affected by large uncertainties, in particular for stars with radiative envelopes, calling for observational constraints. We aim to verify tidally locked rotation for the binary PG 0101+039, a subdwarf B star + white dwarf binary from its tiny (0.025%) light variations measured with the MOST satellite (Randall et al. 2005). Methods. Binary parameters were derived from the mass function, apparent rotation and surface gravity of PG 0101+039 assuming a canonical mass of 0.47 M-circle dot and tidally locked rotation. The light curve was then synthesised and was found to match the observed amplitude well. Results. We verified that the light variations are due to ellipsoidal deformation and that tidal synchronisation is established for PG 0101+039. Conclusions. We conclude that this assumption should hold for all sdB binaries with orbital periods of less than half a day. Hence the masses can be derived from systems that are too faint to measure tiny light variations.en_US
dc.description.departmentMcDonald Observatoryen_US
dc.description.sponsorshipDeutsche Forschungsgemeinschaft He1354/40-3en_US
dc.identifierdoi:10.15781/T27219
dc.identifier.citationGeier, S., S. Nesslinger, U. Heber, S. K. Randall, H. Edelmann, and E. M. Green. >Tidal synchronisation of the subdwarf B binary PG 0101+ 039.> Astronomy & Astrophysics, Vol. 477, No. 2 (Jan., 2008): L13-L16.en_US
dc.identifier.doi10.1051/0004-6361:20078797en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/2152/34461
dc.language.isoEnglishen_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectbinaries : spectroscopicen_US
dc.subjectsubdwarfsen_US
dc.subjectstars : rotationen_US
dc.subjectdetached eclipsing binariesen_US
dc.subjectwhite-dwarfen_US
dc.subjectclose binariesen_US
dc.subjectmain-sequenceen_US
dc.subjectlight curvesen_US
dc.subjectsdb starsen_US
dc.subjectcircularizationen_US
dc.subjectatmosphereen_US
dc.subjecttimesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleTidal Synchronisation Of The Subdwarf B Binary Pg 0101+039en_US
dc.typeArticleen_US

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