2017A&A...602A.102H


Query : 2017A&A...602A.102H

2017A&A...602A.102H - Astronomy and Astrophysics, volume 602A, 102-102 (2017/6-1)

Dwarf nova outbursts in intermediate polars.

HAMEURY J.-M. and LASOTA J.-P.

Abstract (from CDS):

Context. The disc instability model (DIM) has been very successful in explaining the dwarf nova outbursts observed in cataclysmic variables. When, as in intermediate polars, the accreting white dwarf is magnetised, the disc is truncated at the magnetospheric radius, but for mass-transfer rates corresponding to the thermal-viscous instability such systems should still exhibit dwarf-nova outbursts. Yet, the majority of intermediate polars, in which the magnetic field is not large enough to completely disrupt the accretion disc, seem to be stable, and the rare observed outbursts, in particular in systems with long orbital periods, are much shorter than normal dwarf-nova outbursts.
Aims. We investigate the predictions of the disc instability model for intermediate polars in order to determine which of the observed properties of these systems can be explained by the DIM.
Methods. We use our numerical code for the time evolution of accretion discs, modified to include the effects of the magnetic field, with constant or variable mass transfer from the secondary star.
Results. We show that intermediate polars have mass transfer low enough and magnetic fields large enough to keep the accretion disc stable on the cold equilibrium branch. We show that the infrequent and short outbursts observed in long-period systems, such as, for example, TV Col, cannot be attributed to the thermal-viscous instability of the accretion disc, but instead have to be triggered by an enhanced mass-transfer from the secondary, or, more likely, by some instability coupling the white dwarf magnetic field with that generated by the magnetorotational instability operating in the accretion disc. Longer outbursts (a few days) could result from the disc instability.

Abstract Copyright: © ESO, 2017

Journal keyword(s): accretion, accretion disks - stars: dwarf novae - instabilities - instabilities

Simbad objects: 24

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Number of rows : 24
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* V513 Cas CV* 00 18 14.9151594912 +66 18 13.656069684   16.7       ~ 27 0
2 V* HV And CV* 00 40 55.3833704472 +43 24 59.466999960   15.582 15.599 16.131   ~ 26 0
3 V* IW And CV* 01 01 08.9070026424 +43 23 25.791345060     15.0 14.52   sdOB 38 0
4 V* XY Ari CV* 02 56 08.185 +19 26 34.12           ~ 151 1
5 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 908 0
6 V* TV Col CV* 05 29 25.5292422792 -32 49 03.900212364   14.219 13.846 14.181   K2V 325 0
7 V* HT Cam CV* 07 57 01.3362559272 +63 06 02.000945340   16.36       ~ 70 0
8 V* DW Cnc CV* 07 58 53.0399000904 +16 16 45.169158720           ~ 63 0
9 V* CP Pup No* 08 11 46.0634106720 -35 21 04.986480708   15.436 15.227     ~ 255 1
10 V* T Pyx CV* 09 04 41.5061511720 -32 22 47.502932700           ~ 414 0
11 V* BK Lyn CV* 09 20 11.2020621696 +33 56 42.356468364   13.97 13.99 14.72   ~ 109 1
12 V* SX LMi CV* 10 54 30.4187071632 +30 06 10.358155512   16.9   15.6   ~ 70 0
13 V* YY Dra EB* 11 43 35 +71 42.2           ~ 34 1
14 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.51 13.49 13.55   M5-6V 682 0
15 V* BZ Cir CV* 14 54 15.1889492064 -68 16 18.633104472   18.2       ~ 19 0
16 NAME Rapid Burster LXB 17 33 24.61 -33 23 19.8           ~ 402 2
17 OGLE BLG501.24 34423 LP* 17 49 54.52 -29 43 35.8     21.606   15.668 ~ 6 0
18 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 328 0
19 V* WZ Sge CV* 20 07 36.5037622512 +17 42 14.733254952   15.30 15.20     DAepv 930 0
20 V* V1316 Cyg CV* 20 12 13.6496172587 +42 45 51.126307680     14.30     ~ 30 0
21 V* SS Cyg CV* 21 42 42.8034497592 +43 35 09.867842484 11.07 12.651 12.032 9.326   K5V 1268 1
22 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948           ~ 351 0
23 V* CC Scl CV* 23 15 31.8594770904 -30 48 47.673022140   16.6       ~ 45 0
24 V* V455 And CV* 23 34 01.4484962496 +39 21 40.866079356   16.22 16.09 16.14   ~ 133 0

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2023.02.08-01:43:58

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