J/A+A/616/A24ivo://CDS.VizieR/J/A+A/616/A24doi:10.26093/cds/vizier.36160024CDSGehan C.Mosser B.Michel E.Samadi R.Kallinger T.2018-09-28T07:51:00Z2018-08-31T12:19:47ZCDS support team

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

cds-question@unistra.frasteroseismologygiant-starsAsteroseismology allows us to probe stellar interiors. In the case of red giant stars, conditions in the stellar interior are such as to allow for the existence of mixed modes, consisting in a coupling between gravity waves in the radiative interior and pressure waves in the convective envelope. Mixed modes can thus be used to probe the physical conditions in red giant cores. However, we still need to identify the physical mechanisms that transport angular momentum inside red giants, leading to the slow-down observed for red giant core rotation. Thus large-scale measurements of red giant core rotation are of prime importance to obtain tighter constraints on the efficiency of the internal angular momentum transport, and to study how this efficiency changes with stellar parameters. This work aims at identifying the components of the rotational multiplets for dipole mixed modes in a large number of red giant oscillation spectra observed by Kepler. Such identification provides us with a direct measurement of the red giant mean core rotation. We compute stretched spectra that mimic the regular pattern of pure dipole gravity modes. Mixed modes with the same azimuthal order are expected to be almost equally spaced in stretched period, with a spacing equal to the pure dipole gravity mode period spacing. The departure from this regular pattern allows us to disentangle the various rotational components and therefore to determine the mean core rotation rates of red giants. We automatically identify the rotational multiplet components of 1183 stars on the red giant branch with a success rate of 69 per cent with respect to our initial sample. As no information on the internal rotation can be deduced for stars seen pole-on, we obtain mean core rotation measurements for 875 red giant branch stars. This large sample includes stars with a mass as large as 2.5 solar masses, allowing us to test the dependence of the core slow-down rate on the stellar mass. Disentangling rotational splittings from mixed modes is now possible in an automated way for stars on the red giant branch, even for the most complicated cases, where the rotational splittings exceed half the mixed-mode spacing. This work on a large sample allows us to refine previous measurements of the evolution of the mean core rotation on the red giant branch. Rather than a slight slow-down, our results suggest rotation is constant along the red giant branch, with values independent of the mass.2018A&A...616A..24Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/616/A24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/A+A/540/A143 : Oscillations of red giants observed by Kepler (Mosser+, 2012)J/A+A/588/A87 : Seismic global parameters of 6111 KIC (Vrard+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/616/A24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/616/A24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/616/A24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/616/A24https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/616/A24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/616/A24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/616/A24/rotation (Seismic global parameters and rotational splittings)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/616/A24/rotation?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/616/A24/rotation?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/616/A24/rotation?GETtext/xml+votable180.050000true291.3342136.78661440.0055555555555555564/922-923 933-935 944-945 5/3645-3646 3683 3704 3706 3729-3731 3760 3784-3786 3789 3792 6/14567 14573 14575 14578-14579 14588-14589 14591 14730-14731 14744 14746-14747 14750-14751 14792 14794-14795 14822 14828 14830-14831 14914-14915 15044-15045 15057 15059-15062 15148-15150 15153-15155 15160 15172-15174 15178 15200 15232https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/616/A24?format=asciidefaultJ/A+A/616/A24/rotationSeismic global parameters and rotational splittingsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKIC numbermeta.id;meta.mainlongDnuLarge separationuHzem.freq;src.varfloatnumaxFrequency of maximum oscillation poweruHzem.freq;stat.maxfloatDPi1Period spacingstime.periodfloatdnurotRotational splittingnHzem.freq;src.varfloate_dnurotUncertainty on dnurotnHzstat.errorfloatNcompNumber of rotational componentsmeta.numberintSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main