J/ApJ/718/L97ivo://CDS.VizieR/J/ApJ/718/L97doi:10.26093/cds/vizier.17189097CDSVan Grootel V.Charpinet S.Fontaine G.Brassard P.Green E.M.,Randall S.K.Silvotti R.Ostensen R.H.Kjeldsen H.,Christensen-Dalsgaard J.Borucki W.J.Koch D.2018-01-30T07:17:50Z2012-07-03T14:48:57ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frb-starsvariable-starsWe present a seismic analysis of the pulsating hot B subdwarf KPD 1943+4058 (KIC 005807616) on the basis of the long-period, gravity-mode pulsations recently uncovered by Kepler. This is the first time that g-mode seismology can be exploited quantitatively for stars on the extreme horizontal branch, all previous successful seismic analyses having been confined so far to short-period, p-mode pulsators. We demonstrate that current models of hot B subdwarfs can quite well explain the observed g-mode periods, while being consistent with independent constraints provided by spectroscopy. We identify the 18 pulsations retained in our analysis as low-degree ({l}=1 and 2), intermediate-order (k=-9 through -58) g-modes. The periods (frequencies) are recovered, on average, at the 0.22% level, which is comparable to the best results obtained for p-mode pulsators. We infer the following structural and core parameters for KPD 1943+4058 (formal fitting uncertainties only): T_eff_=28050+/-470K, logg=5.52+/-0.03, M_*_=0.496+/-0.002M_{sun}_, log(M_env_/M*)=-2.55+/-0.07, log(1-M_core_/M_*_)=-0.3+/-0.01, and X_core_(C+O)=0.261+/-0.008. We additionally derive the age of the star since the zero-age extended horizontal branch 18.4+/-1.0Myr, the radius R=0.203+/-0.007R_{sun}_, the luminosity L=22.9+/-3.13L_{sun}_, the absolute magnitude M_V_=4.21+/-0.11, the reddening index E(B-V)=0.094+/-0.017, and the distance d=1180+/-95pc.2010ApJ...718L..97Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/718/L97CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/525/A23 : Frequency analysis of HD 49434 (Mathias+, 2011)J/A+A/506/471 : Frequency analysis of CoRoT B stars (Degroote+, 2009)J/A+A/506/111 : Frequency analysis of HD 180642 (V1449 Aql) (Degroote+, 2009)J/A+A/506/79 : Asteroseismic analysis of HD 174936 (Garcia Hernandez+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/718/L97https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/718/L97http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/718/L97https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/718/L97https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/718/L97http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/718/L97GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/718/L97/table2Mode identification and other propertiesk[-63/-3] Radial orderstat.fit.paramintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintl[1/4] Degreestat.fit.paramintnuObs? Observed frequencyuHzem.freqfloatnullablenuThTheoretical frequencyuHzstat.fit.paramdoublePObs? Observed periodstime.periodfloatnullablePThTheoretical periodstime.periodfloatlogELog of the energy; in erglog(1e-07J)phys.energyfloatCklLedoux coefficientstat.fit.paramfloatDelX/X? Relative dispersion (on P or {nu})%stat.errorfloatnullableDelP? Period dispersion {Delta}Pstime.period;instr.dispersionfloatnullableDelnu? Frequency dispersion {Delta}{nu}uHzstat.fit.paramfloatnullableIDMode identification (f_1_-f_27_, u_1_-u_14_)meta.id;stat.fitf_ID[1/2] Flag on ID (1)meta.codecharJ/ApJ/718/L97/table1List of frequencies f_n_ (n is by order of decreasing amplitude) detected in KPD 1943+4058recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDMode identification (f_1_-f_27_, u_1_-u_14_)meta.id;stat.fitprimaryf_ID[*] *: pulsation period safely assumed to be independent (18 periods used in the analysis)meta.codecharPerPeriodstime.periodfloatFreqFrequencyuHzstat.fit.paramfloatS/NSignal to noise ratiostat.snrfloatCommCommentsmeta.note