J/A+A/705/A116ivo://CDS.VizieR/J/A+A/705/A116CDSPietrow A.G.M.Kuckein C.Verma M.Denker C.Trelles Arjona J.C.,Kamlah R.Poppenhaeger K.2026-03-02T06:25:50Z2026-01-13T08:15:07ZCDS support team

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

cds-question@unistra.fratomic-physicsthe-sunspectroscopyWe present high-resolution spectroscopic observations of the quiet-Sun center-to-limb variations (CLV) of the HeI triplet at 10830{AA} and the nearby SiI 10827{AA} line, observed with GREGOR Infrared Spectrograph (GRIS) and the improved High-resolution Fast Imager (HiFI+). The observations cover the interval {mu}=[0.1, 1.0], where {mu} is the cosine of the heliocentric angle. At each {mu}-position, the spectra are spatially averaged over 0.02{mu}, and the resulting CLVs are given both as these averaged data points and as smooth polynomial curves fitted across each wavelength point. The HeI spectra were inverted using the HAnle and ZEeman Light (HAZEL) code, showing an increase in optical depth towards the limb and a reversed convective blueshift for the red component, while the blue component was entirely absent. In addition, we find a strong increase in the steepness of the HeI CLV compared to that of the nearby continuum. The SiI showed a behavior more typical of photospheric lines, namely shallower CLV, a reduction in width and depth, and a more typical convective blueshift.2026A&A...705A.116Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/705/A116CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/705/A116https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/705/A116http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/705/A116https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/705/A116https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/705/A116http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/705/A116GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/705/A116/listList of fits files, center-to-limb variation (CLV) datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHDUNumber of HDU in the file (1)meta.numberintSizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar