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PG 1018−047: the longest period subdwarf B binary
dc.contributor.authorDeca, J.en_US
dc.contributor.authorMarsh, T. R.en_US
dc.contributor.authorØstensen, R. H.en_US
dc.contributor.authorMorales‐rueda, L.en_US
dc.contributor.authorCopperwheat, C. M.en_US
dc.contributor.authorWade, R. A.en_US
dc.contributor.authorStark, M. A.en_US
dc.contributor.authorMaxted, P. F. L.en_US
dc.contributor.authorNelemans, G.en_US
dc.contributor.authorHeber, U.en_US
dc.date.accessioned2012-05-21T15:47:53Z
dc.date.available2013-06-11T19:15:51Zen_US
dc.date.issued2012-04-21en_US
dc.identifier.citationDeca, J.; Marsh, T. R.; Østensen, R. H. ; Morales‐rueda, L. ; Copperwheat, C. M.; Wade, R. A.; Stark, M. A.; Maxted, P. F. L.; Nelemans, G.; Heber, U. (2012). "PGâ 1018â 047: the longest period subdwarf B binary." Monthly Notices of the Royal Astronomical Society 421(4). <http://hdl.handle.net/2027.42/91142>en_US
dc.identifier.issn0035-8711en_US
dc.identifier.issn1365-2966en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/91142
dc.description.abstractAbout 50 per cent of all known hot subdwarf B stars (sdBs) reside in close (short‐period) binaries, for which common‐envelope ejection is the most likely formation mechanism. However, Han et al. predict that the majority of sdBs should form through stable mass transfer leading to long‐period binaries. Determining orbital periods for these systems is challenging and while the orbital periods of ∼100 short‐period systems have been measured, there are no periods measured above 30 d. As part of a large programme to characterize the orbital periods of sdB binaries and their formation history, we have found that PG 1018−047 has an orbital period of 759.8 ± 5.8 d, easily making it the longest period ever detected for a sdB binary. Exploiting the Balmer lines of the subdwarf primary and the narrow absorption lines of the companion present in the spectra, we derive the radial velocity amplitudes of both stars, and estimate the mass ratio M MS / M sdB = 1.6 ± 0.2. From the combination of visual and infrared photometry, the spectral type of the companion star is determined to be mid‐K.en_US
dc.publisherBlackwell Publishing Ltden_US
dc.publisherWiley Periodicals, Inc.en_US
dc.subject.otherBinaries: Closeen_US
dc.subject.otherBinaries: Spectroscopicen_US
dc.subject.otherStars: Evolutionen_US
dc.subject.otherStars: Individual: PG 1018−047en_US
dc.subject.otherSubdwarfsen_US
dc.titlePG 1018−047: the longest period subdwarf B binaryen_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelAstronomyen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Computer Science, Engineering and Physics, The University of Michigan‐Flint, 303 E. Kearsley Street, Flint, MI 48502, USAen_US
dc.contributor.affiliationotherDepartment of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USAen_US
dc.contributor.affiliationotherSymetrica Security Ltd., Phi House, Enterprise Road, Southampton Science Park, Southampton SO16 7NSen_US
dc.contributor.affiliationotherInstituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200D, B‐3001 Leuven, Belgiumen_US
dc.contributor.affiliationotherDepartment of Physics, University of Warwick, Coventry CV4 7ALen_US
dc.contributor.affiliationotherCentrum voor Plasma‐Astrofysica, Katholieke Universiteit Leuven, Celestijnenlaan 200B, B‐3001 Leuven, Belgiumen_US
dc.contributor.affiliationotherDr Karl Remeis‐Observatory & ECAP, Astronomical Institute, Friedrich‐Alexander University Erlangen‐Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germanyen_US
dc.contributor.affiliationotherDepartment of Astrophysics, IMAPP, Radboud University Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlandsen_US
dc.contributor.affiliationotherAstrophysics Group, Keele University, Keele, Staffordshire ST5 5BGen_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/91142/1/j.1365-2966.2012.20483.x.pdf
dc.identifier.doi10.1111/j.1365-2966.2012.20483.xen_US
dc.identifier.sourceMonthly Notices of the Royal Astronomical Societyen_US
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dc.owningcollnameInterdisciplinary and Peer-Reviewed


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