J/MNRAS/454/123 BVRI light curves of Nova V723 Cas (Ochner+, 2015)
Long-term monitoring of orbital modulation and secondary-star irradiation in
Nova Cas 1995 (V723 Cas).
Ochner P., Moschini F., Munari U., Frigo A.
<Mon. Not. R. Astron. Soc., 454, 123-128 (2015)>
=2015MNRAS.454..123O 2015MNRAS.454..123O (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Binaries, cataclysmic ; Photometry, UBVRI
Keywords: novae, cataclysmic variables
Abstract:
We present optical spectroscopy collected at seven epochs and BVRcIc
photometry obtained at 1227 epochs of nova V723 Cas, covering the time
interval between 2007 and 2015. The mean magnitude during this period,
stable at ∼3mag brighter than in quiescence, and the continuous
presence of strong [FeX] and other high-ionization emission lines,
indicates that the nuclear burning at the surface of the white dwarf
is continuing 20-years past the initial outburst. The light curve
shows a large amplitude (2mag) orbital modulation, which is governed
by the visibility of the irradiated side of the secondary star. Our
observations do not confirm the reported increase with time of the
orbital period of V723 Cas, a period of P=16.638383±0.000025h
satisfying equally well all available observations in all bands. Our
observations also do not confirm the presence of an additional
periodicity around P=15.2397h from which V723 Cas was classified as an
intermediate-polar system.
Description:
To monitor the spectroscopic evolution of V723 Cas, we observed it at
seven distinct epochs while it was passing at the photometric minimum
during the orbital motion, i.e. always at the same orbital phase to
avoid introducing spurious differences due to the changing aspect
along the orbital motion.
Low-resolution spectra were obtained with the 1.22m telescope + B&C
spectrograph operated in Asiago by the Department of Physics and
Astronomy of the University of Padova.
Objects:
----------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------
01 05 05.36 +54 00 40.3 V723 Cas = NOVA Cas 1995
----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 82 1227 Our 2007 November-2015 March BVRCIC CCD
photometry of V723 Cas
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.5 d HJD Heliocentric Julian date
15- 24 A10 "date" Obs.date Observation date
26- 31 F6.3 mag Bmag ? Johnson B magnitude
33- 37 F5.3 mag e_Bmag ? rms uncertainty on Bmag (1)
39- 44 F6.3 mag Vmag ? Johnson V magnitude
46- 50 F5.3 mag e_Vmag ? rms uncertainty on Vmag (1)
52- 57 F6.3 mag Rcmag ? Cousins R magnitude
59- 63 F5.3 mag e_Rcmag ? rms uncertainty on Rcmag (1)
65- 70 F6.3 mag Icmag ? Cousins I magnitude
72- 76 F5.3 mag e_Icmag ? rms uncertainty on Icmag (1)
78- 82 A5 --- Tel Telescope ID
--------------------------------------------------------------------------------
Note (1): The total error budget is given.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jun-2016