J/MNRAS/399/2139 CI Cyg BVRcIc light curves (Siviero+, 2009) ================================================================================ The ongoing 2008-09 outburst of CI Cyg. Siviero A., Munari U., Dallaporta S., Valisa P., Luppi V., Moretti S., Tomaselli S., Bacci S., Ballardini F., Cherini G., Graziani M., Frigo A., Vagnozzi A. =2009MNRAS.399.2139S ================================================================================ ADC_Keywords: Stars, variable ; Binaries, cataclysmic ; Photometry, UBVRI Keywords: binaries: symbiotic - novae, cataclysmic variables Abstract: In this paper, we discuss the early phases of the ongoing outburst that CI Cyg, a prototype symbiotic star, is currently undergoing after 30-year quiescence. We have tightly monitored CI Cyg in B V R_C_ I_C_ bands, starting a whole year before the onset of the outburst, and in addition we obtained numerous Echelle high- and low-resolution absolutely flux-calibrated spectra. The outburst started while the accreting white dwarf (WD) was being eclipsed by the Roche lobe filling M giant companion, and it was discovered during the egress phase on the second half of 2008 August. The system reached peak V-band brightness in early 2008 October and has been characterized by amplitudes {delta}B=1.9, {delta}V=1.5, {delta}R_C_=0.9, {delta}I_C_=0.4mag. At maximum V-band brightness, the outbursting WD had expanded to closely resemble an F3 II/Ib star, with MV=-3.5, Teff~6900K and R=28R_{sun}_. The high-ionization emission lines ([NeV], [FeVII], HeII) disappeared and only lower ionization lines were visible. Balmer and He I emission lines declined in equivalent width but increased in absolute flux. The output radiated by the hot component during the outburst corresponds to nuclear burning proceeding at a 2x10^-8^M_{sun}_/yr rate. Description: CCD observations of CI Cyg in the B V RCIC bands were obtained with the following Asiago Novae and Symbiotic Stars (ANS) Collaboration telescopes in Italy. Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 19 50 11.8 +35 41 03 CI Cyg = V* CI Cyg -------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 66 119 BVRcIc photometry of CI Cyg -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 F12.4 d HJD Heliocentric Julian date 14- 19 F6.3 mag Vmag Johnson V magnitude 21- 25 F5.3 mag e_Vmag rms uncertainty on Vmag 27- 31 F5.3 mag B-V ? Johnson B-V colour index 33- 37 F5.3 mag e_B-V ? rms uncertainty on B-V 39- 43 F5.3 mag V-Rc ? Johnson-Cousins V-R colour index 45- 49 F5.3 mag e_V-Rc ? rms uncertainty on V-Rc 51- 55 F5.3 mag V-Ic ? Johnson-Cousins V-I colour index 57- 61 F5.3 mag e_V-Ic ? rms uncertainty on V-Ic 63- 66 A4 --- Obs Observation code (1) -------------------------------------------------------------------------------- Note (1): Observation codes as follows: R010 = a 0.13-m f/6.6 Vixen ED130SS refractor in Trieste R030 = the 0.30-m Meade RCX-400 f/8 Schmidt-Cassegrain of Associazione Astrofili Valle di Cembra (Trento) R071 = a 0.40-m Meade LX200 telescope in Catania R120 = the 0.42-m f/5.4 Newton telescope operated in Bastia (Ravenna) by Associazione Ravennate Astrofili Rheyta R130 = the 0.50-m f/6 Ritchey-Cretien telescope of Associazione Ternana Astrofili (Stroncone, Terni). -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Patricia Vannier [CDS] 12-Aug-2011