J/ApJ/902/42ivo://CDS.VizieR/J/ApJ/902/42doi:10.26093/cds/vizier.19020042CDSFeng H.-C.Yang S.Yang Z.-X.Liu H.T.Bai J.M.Li S.-S.Zhao X.H.,Zhang J.Li Y.B.Xiao M.Xin Y.X.Xing L.F.Lu K.X.Xu L.Wang J.G.,Wang C.J.Zhang X.L.Zhang J.J.Lun B.L.He S.S.2022-09-06T14:00:01Z2022-03-10T15:56:55ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsvisible-astronomyspectroscopyactive-galactic-nucleiIn this paper, we report new results of spectroscopic observations of {gamma}-ray blazar S5 0716+714 from 2019 September to 2020 March with the 2.4m optical telescope at Lijiang Observatory of Yunnan Observatories. The median cadence of observations is ~1 day. During the second observation period (Epoch2), the observational data reveal an extremely bright state and a bluer-when-brighter (BWB) chromatism. The BWB trend of Epoch2 differs significantly from that of the first observation period (Epoch1). A significantly brightness-dependent BWB chromatism emerges in the total data of Epoch1 and Epoch2. The BWB trend becomes weaker toward the brighter states, and likely becomes saturated at the highest state. Based on a log-parabolic function, a power law of synchrotron peak flux and frequency {nu}p, and a power law of the curvature of synchrotron spectrum and its {nu}p, simulation well reproduces the brightness-dependent BWB trend of S5 0716+714. The BWB trend is seemingly controlled by the shift of {nu}p with respect to the observational window, and effectively may be dominated by the variations of electron average energy and magnetic field in the emitting region.2020ApJ...902...42Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/902/42CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)J/AJ/129/1818 : Photometry of S5 0716+714 (Wu+, 2005)J/AZh/83/310 : BV(RI)c photometry of S5 0716+714 (Amirkhanyan+, 2006)J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)J/A+A/451/435 : BV(RI)c photometry of S5 0716+714 (Montagni+, 2006)J/AJ/133/1599 : B'V'R' photometry of S5 0716+714 (Wu+, 2007)J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)J/AJ/136/1846 : BVRI light curves of S5 0716+714 (Zhang+, 2008)J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)J/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)J/AJ/143/108 : B'V'R' phot. of the BL Lac object S5 0716+714 (Wu+, 2012)J/A+A/558/A92 : S5 0716+714 microvariability observation (Bhatta+, 2013)J/ApJ/768/40 : R-band and polarimetry of S5 0716+71 (Larionov+, 2013)J/ApJ/783/83 : BVRI photometry of S5 0716+714 (Liao+, 2014)J/ApJS/218/18 : 2004-2012 BVRI obs. of blazar S5 0716+714 (Dai+, 2015)J/MNRAS/448/1060 : Fermi/LAT broad emission line blazars (Ghisellini+, 2015)J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)J/PAZh/43/407 : S5 0716+714 polarization & brightness (Doroshenko+ 2017)J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 2017)J/A+A/601/A12 : S5 0716+714 VLBI K- and Q-band variability (Lee+, 2017)J/A+A/619/A45 : S5 0716+714 multi-wavelength curves (MAGIC Col.+, 2018)J/ApJS/235/39 : Jet properties of {gamma}-ray-loud 3FGL AGNs (Chen, 2018)J/AJ/155/31 : 2005-2012 BVRI obs. of blazar S5 0716+714 (Hong+, 2018)J/ApJ/880/155 : RI photometry of blazars S5 0716+714 and 3C 273 (Liu+, 2019)J/ApJ/884/92 : 7yrs of VRI obs. of S5 0716+714 and its flares (Xu+, 2019)J/ApJ/888/30 : BVRI and spectroscopic LCs of S5 0716+714 (Feng+, 2020)J/ApJ/893/68 : RadioAstron. III. S5 0716+71 (Kravchenko+, 2020)J/ApJS/247/49 : gri obs. of S5 0716+714 (2017-2019) (Xiong+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/902/42https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/902/42http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/902/42https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/902/42https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/902/42http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/902/42GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/902/42/table1Spectral flux in each bin for Epoch 2JDJulian Datedtime.epochdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFlux4425[1/5.8] Flux, bin 1 (4425{AA}), 10^-14^erg/s/cm^2^/Angstrom (1)1e-14cW.m**-2.nm**-1phot.fluxfloate_Flux4425[0.02/0.16] Uncertainty in Flux44251e-14cW.m**-2.nm**-1stat.errorfloatFlux5125[0.97/4.9] Flux, bin 2 (5125{AA}), 10^-14^erg/s/cm^2^/Angstrom (1)1e-14cW.m**-2.nm**-1phot.flux.densityfloate_Flux5125[0.015/0.09] Uncertainty in Flux51251e-14cW.m**-2.nm**-1stat.errorfloatFlux5825[0.89/4.32] Flux, bin 3 (5825{AA}), 10^-14^erg/s/cm^2^/Angstrom (1)1e-14cW.m**-2.nm**-1phot.fluxfloate_Flux5825[0.013/0.11] Uncertainty in Flux58251e-14cW.m**-2.nm**-1stat.errorfloatFlux6525[0.8/3.82] Flux, bin 4 (6525{AA}), 10^-14^erg/s/cm^2^/Angstrom (1)1e-14cW.m**-2.nm**-1phot.fluxfloate_Flux6525[0.012/0.1] Uncertainty in Flux65251e-14cW.m**-2.nm**-1stat.errorfloatFlux7225[0.79/3.56] Flux, bin 5 (7225{AA}), 10^-14^erg/s/cm^2^/Angstrom (1)1e-14cW.m**-2.nm**-1phot.fluxfloate_Flux7225[0.013/0.1] Uncertainty in Flux72251e-14cW.m**-2.nm**-1stat.errorfloatFlux7925[0.7/3.2] Flux, bin 6 (7925{AA}), 10^-14^erg/s/cm^2^/Angstrom (1)1e-14cW.m**-2.nm**-1phot.fluxfloate_Flux7925[0.011/0.09] Uncertainty in Flux79251e-14cW.m**-2.nm**-1stat.errorfloat