J/A+A/542/A43 V2493 Cyg BVRI long term photometry (Semkov+, 2012)
Optical photometric and spectral study of the new FU Orionis object
V2493 Cyg (HBC 722).
Semkov E.H., Peneva S.P., Munari U., Tsvetkov M.K., Jurdana-Sepic R.,
de Miguel E., Schwartz R.D., Dimitrov D.P., Kjurkchieva D.P., Radeva V.S.
<Astron. Astrophys. 542, A43 (2012)>
=2012A&A...542A..43S 2012A&A...542A..43S
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, CCD ;
Photometry, UBVRI
Keywords: stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be -
stars: individual: V2493 Cyg
Abstract:
We present new results from optical photometric and spectroscopic
observations of the eruptive pre-main sequence star V2493 Cyg
(HBC 722). The object has continued to undergo significant brightness
variations over the past few months and is an ideal target for
follow-up observations.
Description:
We carried out CCD BVRI photometric observations in the field of V2493
Cyg ("Gulf of Mexico") from August 1994 to April 2012, i.e. at the
pre-outburst states and during the phases of the outburst. We acquired
high, medium, and low resolution spectroscopy of V2493 Cyg during
the outburst. To study the pre-outburst variability of the target and
construct its historical light curve, we searched for archival
observations in photographic plate collections. Both CCD and
photographic observations were analyzed using 15 comparison stars in
the field of V2493 Cyg.
Objects:
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RA (2000) DE Designation(s)
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20 58 17.03 +43 53 43.4 V2493 Cyg = HBC 722
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 280 Photometric CCD observations of V2493 Cyg during
the period 1994-2012
table3.dat 85 136 Data from archival photographic observations of
V2493 Cyg during the period 1932-1998
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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- 10 A10 "YYYY/MM/DD" Date Observation date
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- 53 A6 --- Tel Telescope used
55- 62 A8 --- CCD CCD used
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Obs Observatory
19- 26 A8 --- Plate Plate number
29- 38 A10 "YYYY/MM/DD" Date Observation date
40- 50 F11.3 d JD Julian date
52- 64 A13 --- Emul Emulsion
66- 70 A5 --- Filt Filter
73- 74 A2 --- Band [BVRI pg] Observed band
75 A1 --- l_mag [=>] Limit flag on mag
76- 80 F5.2 mag mag Magnitude in Band
82- 85 F4.2 mag e_mag rms uncertainty on mag
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Acknowledgements:
E.H. Semkov, esemkov(at)astro.bas.bg
(End) Patricia Vannier [CDS] 01-Jun-2012