J/A+A/662/A58ivo://CDS.VizieR/J/A+A/662/A58doi:10.26093/cds/vizier.36620058CDSVan Reeth T.De Cat P.Van Beeck J.Prat V.Wright D.J.Lehmann H.,Chene A.-N.Kambe E.Yang S.L.S.Gentile G.Joos M.2022-08-25T12:53:40Z2022-06-14T16:09:34ZCDS support team

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

cds-question@unistra.frvariable-starsphotometryvisible-astronomyspectroscopyThe TESS space mission provides us with high-precision photometric observations of large numbers of bright stars over more than 70% of the entire sky, allowing us to revisit and characterise well-known stars. We aim to conduct an asteroseismic analysis of the gamma Doradus (gamma Dor) star HD 112429 using both the available ground-based spectroscopy and TESS photometry, and assess the conditions required to measure the near-core rotation rate and buoyancy travel time. We collect and reduce the available five sectors of short-cadence TESS photometry of this star, as well as 672 legacy observations from six medium- to high-resolution ground-based spectrographs. We determine the stellar pulsation frequencies from both data sets using iterative prewhitening, do asymptotic g mode modelling of the star and investigate the corresponding spectral line profile variations using the pixel-by-pixel method. We validate the pulsation frequencies from the TESS data up to S/N>=5.6, confirming recent reports in the literature that the classical criterion S/N>=4 does not suffice for space-based observations. We identify the pulsations as prograde dipole g modes and r-mode pulsations, and measure a near-core rotation rate of 1.536(3)d^-1^ and a buoyancy travel time {Pi}0 of 4190(50) s. These results are in agreement with the observed spectral line profile variations, which were qualitatively evaluated using a newly developed toy model. We establish a set of conditions that have to be fulfilled for an asymptotic asteroseismic analysis of g-mode pulsators. In the case of HD112429, two TESS sectors of space photometry suffice. Although a detailed asteroseismic modelling analysis is not viable for g-mode pulsators with only short or sparse light curves of space photometry, it is possible to determine global asteroseismic quantities for a subset of these stars. Thanks to the ongoing TESS mission, this will allow us to characterise many more stars than only those with years of data.2022A&A...662A..58Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/662/A58CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/662/A58https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/662/A58http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/662/A58https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/662/A58https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/662/A58http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/662/A58GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/662/A58/listphotList of reduced and detrended short-cadence TESS photometry of HD112429LCShow the light curvemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSectorTESS sector during which the photometry was takenobs.fieldintFileNameFilename of the associated observed and detrended TESS photometry in subdirectory photmeta.id;phot;meta.filecharJ/A+A/662/A58/listspList of reduced and normalised spectra of HD112429 (with relevant observation information)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstName of the used spectrographmeta.id;instrcharBJDBarycentric Julian Day of the observationdtime.epoch;obsdoubleBVCorBarycentric RV correctionkm/sphys.veloc;arith.diffdoubleSNRSignal-to-noise ratio of the spectrumstat.snrintspShow the spectrummeta.ref.urlcharFileNameFilename of the associated observed and reduced spectrum in subdirectory spmeta.id;meta.filechar