2019MNRAS.482.3622S


Query : 2019MNRAS.482.3622S

2019MNRAS.482.3622S - Mon. Not. R. Astron. Soc., 482, 3622-3635 (2019/January-3)

Hard X-ray view on intermediate polars in the Gaia era.

SULEIMANOV V.F., DOROSHENKO V. and WERNER K.

Abstract (from CDS):

The hardness of the X-ray spectra of intermediate polars (IPs) is determined mainly by the white dwarf (WD) compactness (mass-radius ratio, M/R) and, thus, hard X-ray spectra can be used to constrain the WD mass. An accurate mass estimate requires the finite size of the WD magnetosphere Rm to be taken into the account. We suggested to derive it either directly from the observed break frequency in power spectrum of X-ray or optical light curves of a polar, or assuming the corotation. Here we apply this method to all IPs observed by NuSTAR (10 objects) and Swift/BAT (35 objects). For the dwarf nova GK Per, we also observe a change of the break frequency with flux, which allows us to constrain the dependence of the magnetosphere radius on the mass accretion rate. For our analysis, we calculated an additional grid of two-parameter (M and Rm/R) model spectra assuming a fixed, tall height of the accretion column Hsh/R = 0.25, which is appropriate to determine WD masses in low mass accretion IPs like EX Hya. Using the GaiaData Release 2, we obtain for the first time reliable estimates of the mass accretion rate and the magnetic field strength at the WD surface for a large fraction of objects in our sample. We find that most IPs accrete at a rate of ∼10–9 M yr–1 and have magnetic fields in the range 1-10 MG. The resulting WD mass average of our sample is 0.79 ± 0.16 M, which is consistent with earlier estimates.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - methods: numerical - novae, cataclysmic variables - X-rays: binaries - X-rays: individual: ((EX Hya, GK Per))

Simbad objects: 35

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Number of rows : 35
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* V1033 Cas CV* 00 22 57.6446300016 +61 41 07.571581872           ~ 50 0
2 V* V709 Cas CV* 00 28 48.8267393856 +59 17 22.033767228     14.01     ~ 124 0
3 V* V515 And CV* 00 55 19.8532324488 +46 12 56.987432856           ~ 41 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 913 0
6 USNO-A2.0 1350-05105569 CV* 04 57 06.9748962024 +45 27 48.560418072   18.3   17.5   ~ 8 0
7 V* V1062 Tau CV* 05 02 27.4778229096 +24 45 23.157957240           ~ 70 0
8 V* TV Col CV* 05 29 25.5292422792 -32 49 03.900212364   14.219 13.846 14.181   K2V 326 0
9 V* TX Col CV* 05 43 20.1155786784 -41 01 54.309912963   14.5       ~ 153 0
10 V* V405 Aur CV* 05 57 59.2934496792 +53 53 44.926489464           ~ 126 0
11 V* MU Cam XB* 06 25 16.2519466536 +73 34 39.105603804       14.3   ~ 67 0
12 V* V647 Aur XB* 06 36 32.5534982712 +35 35 43.216106064           ~ 24 0
13 V* V418 Gem XB* 07 04 08.6690512152 +26 25 10.763614452           ~ 29 0
14 V* BG CMi CV* 07 31 29.0079060264 +09 56 23.030740248   14.5       ~ 219 0
15 SWIFT J0732.6-1330 XB* 07 32 37.7092986624 -13 31 08.343979248     15.7     ~ 40 0
16 V* PQ Gem CV* 07 51 17.3280306912 +14 44 23.874868716           ~ 219 0
17 V* EI UMa CV* 08 38 21.9952217352 +48 38 02.163728328   14.9 14.78     ~ 84 1
18 2MASS J08384911-4831248 CV* 08 38 49.1086469712 -48 31 24.818931660   17.6   16.1   ~ 23 0
19 V* DO Dra CV* 11 43 38.4921265896 +71 41 20.559036192       13.747   DQ 215 1
20 V* V1025 Cen CV* 12 38 16.3191432264 -38 42 45.836441856   15.20       ~ 74 0
21 V* EX Hya CV* 12 52 24.2222471899 -29 14 55.999766523   13.51 13.49 13.55   M5-6V 684 0
22 2MASS J15092601-6649232 CV* 15 09 26.0168351808 -66 49 23.279486268           ~ 43 0
23 V* NY Lup XB* 15 48 14.5961459448 -45 28 39.918848376     14.50 14.42   K0/3Ve 95 1
24 UCAC3 114-219187 CV* 16 49 55.6381665624 -33 07 02.089388928   17.43 16.56 16.23   ~ 36 0
25 IGR J16547-1916 CV* 16 54 43.7313487104 -19 16 31.062050724   15.6   15.6   ~ 25 0
26 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 149 0
27 1RXS J171935.6-410054 CV* 17 19 35.8927822656 -41 00 53.529823332   15.60 15.20 15.33 14.3 ~ 59 0
28 1H 1726-058 CV* 17 30 21.9016405464 -05 59 31.840375236   17.04 16.15     ~ 84 0
29 IGR J18173-2509 CV* 18 17 22.1748042325 -25 08 42.511071638     16.9     ~ 30 0
30 V* V1223 Sgr CV* 18 55 02.3108012664 -31 09 49.584656268           ~ 328 0
31 V* V2306 Cyg XB* 19 58 14.4693586728 +32 32 42.003103200 15.16 15.94 15.71 15.76   ~ 63 0
32 V* V2069 Cyg CV* 21 23 44.8214570688 +42 18 01.634864328   16.603 16.031     ~ 48 0
33 RX J2133.7+5107 CV* 21 33 43.6348450728 +51 07 24.729535560   15.80       ~ 73 0
34 V* FO Aqr CV* 22 17 55.3796835600 -08 21 03.754995948           ~ 352 0
35 V* AO Psc CV* 22 55 17.9860863984 -03 10 39.981831564           ~ 304 0

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2023.03.29-21:10:12

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