J/ApJ/805/94ivo://CDS.VizieR/J/ApJ/805/94doi:10.26093/cds/vizier.18050094CDSFoster H.M.Reed M.D.Telting J.H.Ostensen R.H.Baran A.S.2015-11-09T10:28:03Z2015-10-14T14:02:39ZCDS support team

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

cds-question@unistra.frsubdwarf-starsvariable-starsb-starsWe analyze 3yr of nearly continuous Kepler spacecraft short cadence observations of the pulsating subdwarf B (sdB) star KIC 3527751. We detect a total of 251 periodicities, most in the g-mode domain, but some where p-modes occur, confirming that KIC3527751 is a hybrid pulsator. We apply seismic tools to the periodicities to characterize the properties of KIC3527751. Techniques to identify modes include asymptotic period spacing relationships, frequency multiplets, and the separation of multiplet splittings. These techniques allow for 189 (75%) of the 251 periods to be associated with pulsation modes. Included in these are three sets of l=4 multiplets and possibly an l=9 multiplet. Period spacing sequences indicate l=1 and 2 overtone spacings of 266.4+/-0.2 and 153.2+/-0.2s, respectively. We also calculate reduced periods, from which we find evidence of trapped pulsations. Such mode trappings can be used to constrain the core/atmosphere transition layers. Interestingly, frequency multiplets in the g-mode region, which sample deep into the star, indicate a rotation period of 42.6+/-3.4days while p-mode multiplets, which sample the outer envelope, indicate a rotation period of 15.3+/-0.7days. We interpret this as differential rotation in the radial direction with the core rotating more slowly. This is the first example of differential rotation for a sdB star.2015ApJ...805...94Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/805/94CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/A+A/572/A34 : Pulsating solar-like stars in Kepler (Garcia+, 2014)J/A+A/569/A15 : KIC 10553698A asteroseismology (Ostensen+, 2014)J/AJ/147/45 : Kepler mission. IV. Binaries eclipse times (Conroy+, 2014)J/A+A/559/A35 : FBS 0117+396 pulsating sdB star photometry (Ostensen+, 2013)J/MNRAS/422/2600 : KOI-74 radial velocities and fluxes (Bloemen+, 2012)J/MNRAS/421/181 : EC 01541-1409 pulsations frequencies (Reed+, 2012)J/MNRAS/409/1470 : Kepler compact pulsator candidates (Ostensen+, 2010)J/MNRAS/408/L51 : 2M1938+4603 (KIC 9472174) eclipses (Ostensen+, 2010)J/ApJ/718/L97 : Early asteroseismic results from Kepler (Van Grootel+, 2010)J/A+A/513/A6 : NOT survey of subdwarf B stars (Ostensen+, 2010)J/A+A/459/557 : Oscillation modes of PG 1325+101 (Silvotti+, 2006)J/A+A/400/939 : Stellar parameters of 115 HQS sdB stars (Edelmann+, 2003)http://archive.stsci.edu/kepler/ : MAST Kepler home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/805/94https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/805/94http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/805/94https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/805/94https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/805/94http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/805/94GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/805/94/table1Asteroseismic quantitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDPeriodicity identifier (among f001-f251 and t218-t246) (1)meta.notecharf_ID[d*] variations or combined frequency (2)meta.codecharFreq[72/3704] FrequencyuHzem.freq;src.vardoublee_Freq[0.004/0.2] Uncertainty in FrequHzstat.errorfloatPer[269.9/13884] Periodstime.perioddoublee_Per[0.001/8.1] Uncertainty in Persstat.errorfloatAmp[0.1/7.2] Amplitude in parts per thousandsrc.var.amplitudefloatl[0/9]? Best estimate {ell} mode identificationstat.fit.paramintnullablen_lNote on {ell} mode (ambiguity)stat.fit.paramcharm[-9/9]? Best estimate m mode identificationstat.fit.paramintnullablenl1[6/40]? Best estimate n_{ell}=1_ mode identification (see section 3)stat.fit.paramintnullablenl2[4/68]? Best estimate n_{ell}=2_ mode identification (see section 3)stat.fit.paramintnullable(dP/P)1[-0.1/0.4]? Period spacing deviation for {ell}=1meta.notefloatnullable(dP/P)2[-0.5/0.7]? Period spacing deviation for {ell}=2meta.notefloatnullabledelf[0.06/6]? Frequency splitting {delta}f (3)uHzem.freqfloatnullable