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.
<Mon. Not. R. Astron. Soc., 399, 2139-2145 (2009)>
=2009MNRAS.399.2139S 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 RC IC
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 δB=1.9, δV=1.5, δRC=0.9,
δIC=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☉. 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 2x10-8M☉/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:
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RA (2000) DE Designation(s)
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19 50 11.8 +35 41 03 CI Cyg = V* CI Cyg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 66 119 BVRcIc photometry of CI Cyg
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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)
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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).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Aug-2011