Detection of long-period variations in the subdwarf B star PG 0101+039 on the basis of photometry from the MOST satellite

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dc.creator Randall, S. K.
dc.creator Matthews, J. M.
dc.creator Fontaine, G.
dc.creator Rowe, J.
dc.creator Kuschnig, R.
dc.creator Green, E. M.
dc.creator Brassard, P.
dc.creator Chayer, P.
dc.creator Guenther, David B.
dc.creator Moffat, A. F. J.
dc.date.accessioned 2013-10-30T18:22:35Z
dc.date.available 2013-10-30T18:22:35Z
dc.date.issued 2005-11-01
dc.identifier.issn 0004-637X
dc.identifier.uri http://library2.smu.ca/xmlui/handle/01/25306
dc.description Publisher's version/PDF
dc.description.abstract We report the detection of three discrete pulsation frequencies in the long-period variable subdwarf B star PG 0101+039 on the basis of ~400 hr of MOST wide-band photometry. The periodicities uncovered lie at 7235, 5227, and 2650 s, respectively, and are associated with amplitudes between 0.03% and 0.06% of the mean brightness, lower than those measured in any other variable of this kind. We also find evidence for luminosity variations consistent with an ellipsoidal deformation of the subdwarf in the rotationally locked short-period binary system predicted from radial velocity measurements and evolutionary models. Our atmospheric modeling of two independent time-averaged optical spectra of PG 0101+039 yields T[subscript eff] [tilde underscore] 28;300 K and log g [tilde underscore] 5:52, making it one of the hottest long-period variable subdwarf B stars known. The fact that we nevertheless detect brightness variations in the data is in conflict with predictions from current models, which place the theoretical blue edge for observable long-period instabilities at a temperature around 4000 K cooler than that of PG 0101+039. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society
dc.relation.uri http://dx.doi.org/10.1086/452628
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Stellar oscillations
dc.subject.lcsh Dwarf stars
dc.title Detection of long-period variations in the subdwarf B star PG 0101+039 on the basis of photometry from the MOST satellite en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal 633(1), 460-464. (2005)


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1086/452628
 
 

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