J/other/PASA/35.7 Long-term BVRI photometry of V2492 Cygni (Ibryamov+, 2018)
V2492 Cygni: Optical BVRI Variability During the Period 2010-2017.
Ibryamov S.I., Semkov E.H., Peneva S.P.
<Publ. Astron. Soc. Australia, 35, 7 (2018)>
=2018PASA...35....7I 2018PASA...35....7I (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, UBVRI
Keywords: stars: pre-main sequence - stars: individual: V2492 Cygni
Abstract:
Results from BVRI photometric observations of the young stellar object
V2492 Cyg collected during the period from August 2010 to December
2017 are presented. The star is located in the field of the Pelican
Nebula and it was discovered in 2010 due to its remarkable increase in
the brightness by more than 5mag in R-band. According to the first
hypothesis of the variability, V2492 Cyg is an FUor candidate. During
subsequent observations, it was reported that the star shows the
characteristics inherent to EXor- and UXor-type variables. The optical
data show that during the whole time of observations the star exhibits
multiple large amplitude increases and drops in the brightness. In the
beginning of 2017, we registered a significant increase in the optical
brightness of V2492 Cyg, which seriously exceeds the maximal
magnitudes registered after 2010.
Description:
BVRI photometric data of V2492 Cyg collected during the period from
August 2010 to December 2017 are presented. The CCD observations were
carried out with the 2-m Ritchey-Chretien-Coude, the 50/70-cm Schmidt
and the 60-cm Cassegrain telescopes administered by Rozhen National
Astronomical Observatory in Bulgaria and the 1.3-m Ritchey-Chretien
telescope administered by Skinakas Observatory in Greece. The
technical parameters and specifications for the cameras used, the
observational procedure, and the data reduction process are given in
Ibryamov et al. (2015PASA...32...21I 2015PASA...32...21I, Cat. J/other/PASA/32.21. All
frames were taken through a standard Johnson-Cousins set of filters.
All data were analysed using the same aperture, which was chosen to
have a 4-arcsec radius, while the background annulus was taken from 9
to 14-arcsec. The magnitudes of V2492 Cyg from all CCD frames are
measured with the standard stars reported in the current paper. The
average value of the errors in the reported magnitudes is 0.01-0.02mag
for the I- and R-band data, 0.01-0.03mag for the V-band data, and
0.02-0.04mag for the B-band data.
Objects:
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RA (2000) DE Designation(s)
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20 51 26.23 +44 05 23.9 V2492 Cyg = PTF 10nvg
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 56 201 V2492 Cygni photometric CCD observations during
the period 2010 Aug-2017 Dec
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See also:
J/A+A/551/A62 : V2492 Cyg light variations (Kospal+, 2013)
J/AJ/145/59 : PTF 10nvg optical & mid-IR photometry (Hillenbrand+ 2013)
J/other/RAA/14.1264 : V350 Cep UBVRI long-term photometry (Ibryamov+, 2014)
J/other/PASA/32.11 : Long-term UBVRI photometry of GM Cep (Semkov+, 2015)
J/other/PASA/32.21 : Long-Term Multicolour Photometry of YSOs (Ibryamov+ 2015)
J/other/BAJ/22.3 : BVRI photometry of 5 PMS stars (Ibryamov+, 2015)
J/other/BAJ/24.62 : BVRI Photometry of 14 PMS stars (Ibryamov+, 2016)
J/other/RAA/17.20 : V977 Cep & V982 Cep long-term photometry (Ibryamov+ 2017)
J/other/RAA/18.137 : 15 PMS stars long-term BVRI photometry (Ibryamov+, 2018)
J/other/BAJ/29.10 : Long-term BVRI photometry of V1704 Cygni (Ibryamov+ 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "date" Date Date of observation ('DD.MM.YYYY' format)
12- 22 F11.3 d JD Julian Date
24- 28 F5.2 mag Imag ? I magnitude
30- 34 F5.2 mag Rmag ? R magnitude
36- 40 F5.2 mag Vmag ? V magnitude
42- 46 F5.2 mag Bmag ? B magnitude
48- 52 A5 --- Tel Telescope used (1)
54- 56 A3 --- CCD CCD used (2)
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Note (1): Telescopes as follows:
2-m = 2-m Ritchey-Chretien-Coude telescope of the Rozhen National
Astronomical Observatory (Bulgaria)
Sch = 50/70-cm Schmidt telescope of the Rozhen National Astronomical
Observatory (Bulgaria)
60-cm = 60-cm Cassegrain telescope of the Rozhen National Astronomical
Observatory (Bulgaria)
1.3-m = 1.3-m Ritchey-Chretien telescope of the Skinakas Observatory
(Greece)
Note (2): CCD cameras as follows:
FLI = FLI PL16803 (50/70-cm Shmidt telescope)
FLI PL09000 (60-cm Cassegrain telescope)
VA = VersArray 1300B
AND = ANDOR DZ436-BV
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Acknowledgements:
Dr. Sunay I. Ibryamov, sibryamov(at)shu.bg,
Department of Physics and Astronomy, University of Shumen, Bulgaria.
(End) Patricia Vannier [CDS] 02-Jan-2019