2020A&A...642A.100N


Query : 2020A&A...642A.100N

2020A&A...642A.100N - Astronomy and Astrophysics, volume 642A, 100-100 (2020/10-1)

Voracious vortices in cataclysmic variables. II. Evidence for the expansion of accretion disc material beyond the Roche lobe of the accretor in HT Cassiopeia during its 2017 superoutburst.

NEUSTROEV V.V. and ZHARIKOV S.V.

Abstract (from CDS):


Context.In PaperI we showed that the accretion disc radius of the dwarf nova HT Cas in its quiescent state has not changed significantly during many years of observations.It has remained consistently large, close to the tidal truncation radius. This result is inconsistent with the modern understanding of the evolution of the disc radius through an outburst cycle.
Aims. Spectroscopic observations of HT Cas during its superoutburst offered us an exceptional opportunity to compare the properties of the disc of this object in superoutburst and in quiescence.
Methods. We obtained a new set of time-resolved spectra of HT Cas in the middle of its 2017 superoutburst. We used Doppler tomography to map emission structures in the system, which we compared with those detected during the quiescent state. We used solutions of the restricted three-body problem to discuss again the location of emission structures and the disc size of HT Cas in quiescence.
Results. The superoutburst spectrum is similar in appearance to the quiescent spectra, although the strength of most of the emission lines decreased. However, the high-excitation lines significantly strengthened in comparison with the Balmer lines. Many lines show a mix of broad emission and narrow absorption components. Hα in superoutburst was much narrower than in quiescence. Other emission lines have also narrowed in outburst, but they did not become as narrow as Hα. Doppler maps of Hα in quiescence and of the Hβ and HeI lines in outburst are dominated by a bright emission arc at the right side of the tomograms, which is located at and even beyond the theoretical truncation limit. However, the bulk of the Hα emission in outburst has significantly lower velocities.
Conclusions. We show that the accretion disc radius of HT Cas during its superoutburst has become hot but remained the same size as it was in quiescence.Instead, we detected cool gas beyond the Roche lobe of the white dwarf that may have been expelled from the hot disc during the superoutburst.

Abstract Copyright: © ESO 2020

Journal keyword(s): methods: observational - accretion - accretion disks - binaries: close - novae - cataclysmic variables - stars: dwarf novae - stars: individual: HT Cas

Simbad objects: 13

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Number of rows : 13
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* HT Cas CV* 01 10 13.1213309510 +60 04 35.489284826     14.10     M5.5e 373 0
2 V* VW Hyi CV* 04 09 11.3966476826 -71 17 41.555169342   12.00 12.30 14.16   ?+L0:e 623 0
3 V* RR Pic No* 06 35 36.0633947411 -62 38 24.292758747   12.30 12.502   12.385 ~ 327 0
4 V* EZ Lyn CV* 08 04 34.2191501584 +51 03 49.367636054   17.1   17.4   ~ 58 0
5 Feige 34 HS* 10 39 36.7377085527 +43 06 09.209752646 9.613 10.91 11.14 11.319 11.464 sdOp 621 0
6 CRTS SSS130101 J122222-311525 CV* 12 22 21.6665292165 -31 15 23.827876086   18.2   18.2   ~ 31 0
7 V* V406 Vir CV* 12 38 13.7338474960 -03 39 32.965693473           DA3e 41 0
8 V* UX UMa CV* 13 36 40.9533414077 +51 54 49.424110262   12.78 13.26     sdOB 506 0
9 V* V1838 Aql CV* 19 15 01.99 +07 19 47.1           ~ 13 0
10 V* WZ Sge CV* 20 07 36.5036203067 +17 42 14.733657651   15.30 15.20     DAepv 907 0
11 V* AE Aqr CV* 20 40 09.1598509019 -00 52 15.057042857   12.46 10.40   10.191 K3-5IV/V 626 0
12 TCP J21040470+4631129 CV* 21 04 04.6783629347 +46 31 14.465159323           ~ 11 0
13 V* IP Peg CV* 23 23 08.5362716048 +18 24 59.206210572           M2 366 0

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:02:04

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