2016A&A...592A..58D


Query : 2016A&A...592A..58D

2016A&A...592A..58D - Astronomy and Astrophysics, volume 592A, 58-58 (2016/8-1)

RT Crucis: a look into the X-ray emission of a peculiar symbiotic star.

DUCCI L., DOROSHENKO V., SULEIMANOV V., NIKOLAJUK M., SANTANGELO A. and FERRIGNO C.

Abstract (from CDS):

Symbiotic stars are a heterogeneous class of interacting binaries. Among them, RT Cru has been classified as prototype of a subclass that is characterised by hard X-ray spectra that extend past ∼20keV. We analyse ∼8.6Ms of archival INTEGRAL data collected during the period 2003-2014, ∼140ks of Swift/XRT data, and a Suzaku observation of 39ks, to study the spectral X-ray emission and investigate the nature of the compact object. Based on the 2MASS photometry, we estimate the distance to the source of 1.2-2.4kpc. The X-ray spectrum obtained with Swift/XRT, JEM-X, IBIS/ISGRI, and Suzaku data is well fitted by a cooling flow model modified by an absorber that fully covers the source and two partially covering absorbers. Assuming that the hard X-ray emission of RT Cru originates from an optically thin boundary layer around a non-magnetic white dwarf, we estimated a mass of the white dwarf of MWD~=1.2M. The mass accretion rate obtained for this source might be too high for the optically thin boundary layer scenario. Therefore we investigate other plausible scenarios to model its hard X-ray emission. We show that, alternatively, the observed X-ray spectrum can be explained with the X-ray emission from the post-shock region above the polar caps of a magnetised white dwarf with mass MWD~=0.9-1.1M.

Abstract Copyright: © ESO, 2016

Journal keyword(s): X-rays: binaries - white dwarfs - stars: individual: RT Cru - stars: individual: IGR J12349-6434

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 CD-57 3057 Sy* 10 11 02.9432180688 -57 48 13.948381620   11.26 9.99     M4IIIe 66 0
2 V* RT Cru Sy* 12 34 53.7361211904 -64 33 56.099018448   12.20 11.35 12.09   M4/5e 91 0
3 V* T CrB Sy* 15 59 30.1622265912 +25 55 12.613382940   11.516 10.247 9.70   M3IIIe_sh 724 0
4 V* V2116 Oph Sy* 17 32 02.1532435416 -24 44 44.129169096   20.78 18.4     M6IIIe 687 1
5 V* RS Oph Sy* 17 50 13.1591484960 -06 42 28.480729788   11.884 10.776 11.228   K5.5/M0IIIe 1080 0
6 V* V426 Oph CV* 18 07 51.6919772928 +05 51 47.804055084           ~ 169 0
7 V* CH Cyg Sy* 19 24 33.0657463320 +50 14 29.095038672 8.14 8.77 7.08   5.345 M7IIIab+Be 766 0
8 V* CI Cyg Sy* 19 50 11.8342618008 +35 41 03.004794996   11.97 9.90     M4.9III 420 0
9 V* LS Peg CV* 21 51 57.9373184400 +14 06 53.271115344   11.886 11.800 12.4   ~ 88 0

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