J/ApJ/888/30ivo://CDS.VizieR/J/ApJ/888/30doi:10.26093/cds/vizier.18880030CDSFeng H.-C.Liu H.T.Bai J.M.Xing L.F.Li Y.B.Xiao M.Xin Y.X.2021-09-29T11:41:55Z2021-07-19T12:39:38ZCDS support team

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

cds-question@unistra.frbl-lacertae-objectsinfrared-photometryvisible-astronomybroad-band-photometryspectroscopyIn order to study short timescale optical variability of {gamma}-ray blazar S5 0716+714, quasi-simultaneous spectroscopic and multiband photometric observations were performed from 2018 November to 2019 March with the 2.4m optical telescope located at Lijiang Observatory of Yunnan Observatories. The observed spectra are well fitted with a power law F_{lambda}_=A{lambda}^-{alpha}^ (spectral index {alpha}>0). Correlations found between {dot}{alpha}, {dot}A, {dot}A/A, {dot}F_{lambda}_, and {dot}F_{lambda}_/F_{lambda}_ are consistent with the trend of bluer-when-brighter (BWB). It is the same case for colors, magnitudes, color variation rates, and magnitude variation rates of photometric observations. The variations of {alpha} lead those of F_{lambda}_. Also, the color variations lead magnitude variations. The observational data are mostly distributed in the I(+,+) and III(-,-) quadrants of the coordinate system. Both spectroscopic and photometric observations show BWB behaviors in S5 0716+714. The observed BWB may be explained by the shock-jet model, and its appearance may depend on the relative position of the observational frequency ranges with respect to the synchrotron peak frequencies, e.g., at the left of the peak frequencies. Fractional variability amplitudes are F_var_~40% for both spectroscopic and photometric observations. Variations of {alpha} indicate variations of relativistic electron distribution producing the optical spectra.2020ApJ...888...30Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/888/30CatalogResearchIsServedByTAP VizieR generic servicerelated-toVIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)VIII/85 : SPECFIND V2.0 Catalog of radio continuum spectra (Vollmer+ 2009)J/A+AS/115/1 : Optical identification of S5 catalog (Stickel+, 1996)J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)J/ApJ/522/846 : Optical monitoring of GeV loud blazars (Xie+, 1999)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/MNRAS/401/1240 : Light curves of flat-spectrum radio sources (Jenness+, 2010)J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)J/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)J/A+A/548/A79 : INTEGRAL-OMC opt. variable sources (Alfonso-Garzon+, 2012)J/AJ/143/108 : B'V'R' photometry of the BL Lac object S5 0716+714 (Wu+, 2012)J/ApJ/768/40 : R-band and polarimetry of S5 0716+71 (Larionov+, 2013)J/A+A/558/A92 : S5 0716+714 microvariability observation (Bhatta+, 2013)J/ApJ/782/45 : SEAMBHs. I. Mrk 142, Mrk 335, and IRAS F12397+3333 (Du+, 2014)J/ApJ/783/83 : BVRI photometry of S5 0716+714 (Liao+, 2014)J/MNRAS/448/1060 : Fermi/LAT broad emission line blazars (Ghisellini+, 2015)J/ApJS/218/18 : 2004-2012 BVRI observations of blazar S5 0716+714 (Dai+, 2015)J/ApJ/798/134 : MOJAVE. XII. Acceleration of blazar jets (Homan+, 2015)J/A+A/587/A112 : Long term R and V band monitoring of AGN (Taris+, 2016)J/A+A/596/A45 : Radio light curves of 8 AGN (Fuhrmann+, 2016)J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)J/AZh/93/605 : AGN long-term variability (Volvach+, 2016)J/ApJ/827/118 : A new reverberation mapping campaign on NGC 5548 (Lu+, 2016)J/ApJ/849/161 : BVRI light curves of the BL Lac object Mrk 501 (Feng+, 2017)J/ApJ/851/33 : Multi-wavelength analysis of CGRaBS blazars (Paliya+, 2017)J/A+A/601/A12 : S5 0716+714 VLBI K- and Q-band variability (Lee+, 2017)J/PAZh/43/407 : S5 0716+714 pol. & brightness 1991-2004 (Doroshenko+ 2017)J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 2017)J/AJ/155/31 : 2005-2012 BVRI obs. of blazar S5 0716+714 (Hong+, 2018)J/A+A/619/A45 : S5 0716+714 multi-wavelength curves (MAGIC Col.+, 2018)J/A+A/620/A185 : Long-term optical monitoring of TeV Blazars (Nilsson+, 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/ApJS/247/49 : gri obs. of the blazar 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/888/30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/888/30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/888/30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/888/30https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/888/30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/888/30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.367228618189496e-19 4.920466254354166e-19OpticalInfrareddefaultJ/ApJ/888/30/table2Photometric data in the Johnson B bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of B band observationdtime.epochdoubleBmag[14/15.9] B band magnitude of objectmagphot.mag;em.opt.Bfloate_Bmag[0.001/0.05] Uncertainty in Bmag-omagstat.error;phot.magfloatBmag-s[13.26/13.32] B band magnitude of comparison starmagphot.mag;em.opt.BfloatJ/ApJ/888/30/table3Photometric data in the Johnson V bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of V band observationdtime.epochdoubleVmag[13.2/15.1] V band magnitude of objectmagphot.mag;em.opt.Vfloate_Vmag[0.001/0.2] Uncertainty in Vmag-omagstat.error;phot.magfloatVmag-s[12.42/12.48] V band magnitude of comparison starmagphot.mag;em.opt.VfloatJ/ApJ/888/30/table4Photometric data in the Cousins R bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of R band observationdtime.epochdoubleRmag[12.8/14.6] R band magnitude of objectmagphot.mag;em.opt.Rfloate_Rmag[0.002/0.09] Uncertainty in Rmag-omagstat.error;phot.magfloatRmag-s[12.05/12.15] R band magnitude of comparison starmagphot.mag;em.opt.RfloatJ/ApJ/888/30/table5Photometric data in the Cousins I bandrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of I band observationdtime.epochdoubleImag[12.35/13.95] I band magnitude of objectmagphot.mag;em.opt.Ifloate_Imag[0.001/0.07] Uncertainty in Imag-omagstat.error;phot.magfloatImag-s[11.76/11.85] I band magnitude of comparison starmagphot.mag;em.opt.IfloatJ/ApJ/888/30/table6Spectral flux in each binrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Date of observationdtime.epochdoubleFlux-bin1[0.4/2.3] Spectral Bin # 11e-16W.m**-2.nm**-1spect.binSizefloate_Flux-bin1[0.01/0.13] Uncertainty in Flux-bin11e-16W.m**-2.nm**-1stat.errorfloatFlux-bin2[0.38/2] Spectral Bin # 21e-16W.m**-2.nm**-1spect.binSizefloate_Flux-bin2[0.01/0.11] Uncertainty in Flux-bin21e-16W.m**-2.nm**-1stat.errorfloatFlux-bin3[0.3/1.8] Spectral Bin # 31e-16W.m**-2.nm**-1spect.binSizefloate_Flux-bin3[0.008/0.11] Uncertainty in Flux-bin31e-16W.m**-2.nm**-1stat.errorfloatFlux-bin4[0.35/1.61] Spectral Bin # 41e-16W.m**-2.nm**-1spect.binSizefloate_Flux-bin4[0.007/0.11] Uncertainty in Flux-bin41e-16W.m**-2.nm**-1stat.errorfloatFlux-bin5[0.37/1.53] Spectral Bin # 51e-16W.m**-2.nm**-1spect.binSizefloate_Flux-bin5[0.01/0.11] Uncertainty in Flux-bin51e-16W.m**-2.nm**-1stat.errorfloatFlux-bin6[0.36/1.4] Spectral Bin # 61e-16W.m**-2.nm**-1spect.binSizefloate_Flux-bin6[0.008/0.17] Uncertainty in Flux-bin61e-16W.m**-2.nm**-1stat.errorfloat