2006A&A...449.1151D


Query : 2006A&A...449.1151D

2006A&A...449.1151D - Astronomy and Astrophysics, volume 449, 1151-1160 (2006/4-3)

The long period intermediate polar 1RXSJ154814.5-452845.

DE MARTINO D., BONNET-BIDAUD J.-M., MOUCHET M., GAENSICKE B.T., HABERL F. and MOTCH C.

Abstract (from CDS):

We present the first time resolved medium resolution optical spectroscopy of the recently identified peculiar Intermediate Polar (IP) 1RXSJ154814.5-452845, which allows us to precisely determine the binary orbital period (PΩ=9.87±0.03h) and the white dwarf spin period (Pω=693.01±0.06s). This system is then the third just outside the purported ∼6-10h IP orbital period gap and the fifth of the small group of long period IPs, which has a relatively high degree of asynchronism. From the presence of weak red absorption features, we identify the secondary star with a spectral type K2±2 V, which appears to have evolved on the nuclear timescale. From the orbital radial velocities of emission and the red absorption lines a mass ratio q=0.65±0.12 is found. The masses of the components are estimated to be MWD≥0.5M and Msec=0.4-0.79M and the binary inclination 25°<i≤58°. A distance between 540-840pc is estimated. At this distance, the presence of peculiar absorption features surrounding Balmer emissions cannot be due to the contribution of the white dwarf photosphere and their spin modulation suggests an origin in the magnetically confined accretion flow. The white dwarf is also not accreting at a particularly high rate ({dot}(M)<5x1016g/s), for its orbital period. The spin-to-orbit period ratio Pω/PΩ=0.02 and the low mass accretion rate suggest that this system is far from spin equilibrium. The magnetic moment of the accreting white dwarf is found to be µ<4.1x1032G.cm3, indicating a low magnetic field system.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: novae, cataclysmic variables

Simbad objects: 12

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Number of rows : 12
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* V709 Cas CV* 00 28 48.8267393856 +59 17 22.033767228     14.01     ~ 120 0
2 V* EF Eri CV* 03 14 13.2526234800 -22 35 42.900077688   15.4 14.53 13.5   ~ 425 0
3 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 900 0
4 V* V1062 Tau CV* 05 02 27.4778229096 +24 45 23.157957240           ~ 67 0
5 V* V834 Cen CV* 14 09 07.2863511816 -45 17 16.023776676   16.0   15.301   M6.5 307 0
6 V* NY Lup XB* 15 48 14.5961459448 -45 28 39.918848376     14.50 14.42   K0/3Ve 90 1
7 PG 1550+191 CV* 15 52 47.1968971224 +18 56 28.844471472   16.4 15.46 17.0   M6.5Ve 181 0
8 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 467 0
9 V* V2400 Oph CV* 17 12 36.4233668016 -24 14 44.773987164     14.5     ~ 144 0
10 1H 1726-058 CV* 17 30 21.9016405464 -05 59 31.840375236   17.04 16.15     ~ 81 0
11 V* AE Aqr CV* 20 40 09.1598959176 -00 52 15.055595220   12.46 10.40   10.191 K3-5IV/V 652 0
12 RX J2133.7+5107 CV* 21 33 43.6348450728 +51 07 24.729535560   15.80       ~ 69 0

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2022.11.28-13:36:03

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