J/MNRAS/462/2695 Symbiotic recurrent nova T CrB spectroscopy (Ilkiewicz+, 2016)
Active phases and flickering of a symbiotic recurrent nova T CrB.
Ilkiewicz K., Mikolajewska J., Stoyanov K., Manousakis A., Miszalski B.
<Mon. Not. R. Astron. Soc., 462, 2695-2705 (2016)>
=2016MNRAS.462.2695I 2016MNRAS.462.2695I (SIMBAD/NED BibCode)
ADC_Keywords: Novae ; Binaries, cataclysmic ; Equivalent widths
Keywords: accretion, accretion discs - binaries: close - binaries: symbiotic -
stars: individual: T CrB - novae, cataclysmic variables
Abstract:
T CrB is a symbiotic recurrent nova known to exhibit active phases,
characterized by apparent increases in the hot component temperature
and the appearance of flickering, i.e. changes in the observed flux on
the time-scale of minutes. Historical UV observations have ruled out
orbital variability as an explanation for flickering and instead
suggest flickering is caused by variable mass transfer. We have
analysed optical and X-ray observations to investigate the nature of
the flickering as well as the active phases in T CrB. The
spectroscopic and photometric observations confirm that the active
phases follow two periods of ∼1000d and ∼5000d. Flickering
in the X-rays is detected and follows an amplitude-flux relationship
similar to that observed in the optical. The flickering is most
prominent at harder X-ray energies, suggesting that it originates in
the boundary layer between the accretion disc and the white dwarf. The
X-ray radiation from the boundary layer is then reprocessed by a thick
accretion disc or a nebula into UV radiation. A more detailed
understanding of flickering would benefit from long-term simultaneous
X-ray and optical monitoring of the phenomena in symbiotic recurrent
novae and related systems such as Z And type symbiotic stars.
Description:
Spectroscopic observations were obtained from the Astronomical Ring
for Access to Spectroscopy data base (ARAS,
http://www.astrosurf.com/aras/).
Objects:
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RA (2000) DE Designation(s)
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15 59 30.16 +25 55 12.6 T CrB = HD 143454
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 46 51 Emission line fluxes
tablea3.dat 40 65 Equivalent widths of emission lines
tableb1.dat 31 17 Swift UVOT observations of T CrB
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 d MJD Modified Julian date
7- 16 A10 "date" Date Observation date
18- 21 F4.2 --- Phase Phase (1)
23- 27 F5.2 mag Vmag V magnitude
29- 32 F4.1 10-16W/m2 FHeII ? Emission line flux of HeII 4686
34- 37 F4.1 10-16W/m2 FHb ? Emission line flux of Hβ
39- 41 I3 10-16W/m2 FHa ? Emission line flux of Hα
43- 46 F4.1 10-16W/m2 FHeI ? Emission line flux of HeI 5876
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Note (1): Orbital phase based on ephemeris from Lines et al.
(1988AJ.....95.1505L 1988AJ.....95.1505L).
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 d MJD Modified Julian date
7- 16 A10 "date" Date Observation date
18- 21 F4.2 --- Phase Phase (1)
23- 26 F4.1 0.1nm EWHeII ? Equivalent width of HeII 4686
28- 31 F4.1 0.1nm EWHb ? Equivalent width of Hβ
33- 36 F4.1 0.1nm EWHa ? Equivalent width of Hα
38- 40 F3.1 0.1nm EWHeI ? Equivalent width of HeI 5876
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Note (1): Orbital phase based on ephemeris from Lines et al.
(1988AJ.....95.1505L 1988AJ.....95.1505L).
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Date Observation date
12- 15 I4 s ExpTime Exposure time
17- 20 A4 --- Filt UVOT filter
22- 26 F5.2 mag mag Magnitude in filter
28- 31 F4.2 mag e_mag rms uncertainty on mag
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Feb-2018