J/A+A/584/A12 PNV J03093063+2638031 outburst evolution (Munari+, 2015)
Outburst evolution, historic light curve and a flash-ionized nebula around the
WZ Sge-type object PNV J03093063+2638031.
Munari U., Jurdana-Sepic R., Ochner P., Cherini G.
<Astron. Astrophys. 584, A12 (2015)>
=2015A&A...584A..12M 2015A&A...584A..12M (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Binaries, cataclysmic ; Spectroscopy
Keywords: novae, cataclysmic variables
Abstract:
We have monitored the 2014 superoutburst of the WZ Sge-type transient
PNV J03093063+2638031 for more than four months, from V=11.0 maximum
brightness down to V=18.4mag, close to quiescence value, by obtaining
BV Rc Ic photometry and low resolution fluxed spectroscopy. The
evolution was normal and no late-time 'echo' outbursts were
observed. The absolute integrated flux of emission lines kept
declining along the superoutburst, and their increasing contrast with
the underlying continuum was simply the result of the faster decline
of the continuum compared to the emission lines. Inspection of
historical Harvard plates covering the 1899-1981 period did not reveal
previous outbursts, neither 'normal' nor 'super'. We discovered
an extended emission nebula (radius ∼1-arcmin) around PNV
J03093063+2638031, that became visible for a few months as the result
of photo-ionization from the superoutburst of the central star. The
nebula is not present on Palomar I and II sky survey images and it
quickly disappeared when the outburst was over. From the rate at which
the ionization front swept through the nebula, we derive a distance of
∼120pc to the system. The nebula is density bounded with an outer
radius of 0.03pc, and the absolute magnitude of the central star in
quiescence is MV∼14.2mag. The electron density in the nebula is
estimated to be 105cm-3 from the observed recombination time
scale. Given the considerable substructures seen across the nebula, a
low filling factor is inferred. Similar nebulae have not been reported
for other WZ Sge objects and the challenges posed to models are
considered.
Description:
The photometric observations of PNV during the 2014 superoutburst were
carried out with three different telescopes. ANS Collaboration
telescope N. 11, located in Trieste (Italy), was used when the object
was bright. It is a 13cm f/6.6 Vixen ED130SS refractor equipped with
Custom Scientific UBV Rc Ic photometric filters and a SBIG ST10XME CCD
camera, 2184x1472 array, 6.8um pixel providing a focal plane scale of
1.63"/pix and a field of view of 60'x40'.
Low-resolution spectroscopy of PNV was 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:
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RA (2000) DE Designation(s)
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03 09 30.63 +26 38 03.1 PNV J03093063+2638031 = USNO-B1.0 1166-003773
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 42 332 Upper limits to the magnitude of PNV
J03093063+2638031 on the 332 Harvard plates we
inspected looking for previous unrecorded outbursts
20141030.dat 21 2043 PNV J03093063+2638031 spectrum on 2014/10/30
20141102.dat 21 2043 PNV J03093063+2638031 spectrum on 2014/11/02
20141123.dat 20 2043 PNV J03093063+2638031 spectrum on 2014/11/23
20141223.dat 20 2023 PNV J03093063+2638031 spectrum on 2014/12/23
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- JD Julian date
12- 21 A10 "YYYY-MM-DD" Obs.date Observation date
23- 27 A5 "h:m" Obs.time Observation time (UT)
29- 31 A3 --- SPlate Plate series
33- 37 I5 --- NPlate Plate number
39- 42 F4.1 mag maglim Limiting magnitude of the plate
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Byte-by-byte Description of file (#): 2014*.dat
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Bytes Format Units Label Explanations
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3- 10 F8.3 0.1nm lambda Wavelength
13- 21 F9.5 [10mW/m2/nm] logFlux Flux (in erg/cm2/s/Å)
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Acknowledgements:
Ulisse Munari, ulisse.munari(at)oapd.inaf.it
(End) Patricia Vannier [CDS] 12-Nov-2015