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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 (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: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 15 59 30.16 +25 55 12.6 T CrB = HD 143454 -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
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
Byte-by-byte Description of file: tablea2.dat
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- 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
Note (1): Orbital phase based on ephemeris from Lines et al. (1988AJ.....95.1505L).
Byte-by-byte Description of file: tablea3.dat
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
Note (1): Orbital phase based on ephemeris from Lines et al. (1988AJ.....95.1505L).
Byte-by-byte Description of file: tableb1.dat
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
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Feb-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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