2014A&A...572A..99B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET00:24:15

2014A&A...572A..99B - Astronomy and Astrophysics, volume 572A, 99-99 (2014/12-1)

Polarimetric and spectroscopic optical observations of the ultra-compact X-ray binary 4U 0614+091.

BAGLIO M.C., MAINETTI D., D'AVANZO P., CAMPANA S., COVINO S., RUSSELL D.M. and SHAHBAZ T.

Abstract (from CDS):

We present a polarimetric and spectroscopic study of the persistent ultra-compact X-ray binary 4U 0614+091 aimed at searching for the emission of a relativistic particle jet and at unveiling the orbital period Porb of the system. We obtained r-band polarimetric observations with the Telescopio Nazionale Galileo (TNG) equipped with the PAOLO polarimeter and with the Nordic Optical Telescope (NOT) equipped with the ALFOSC instrument, covering ∼2h and ∼0.5h observations, respectively. We carried out low resolution spectroscopy of the system using the ESO Very Large Telescope equipped with FORS1 for ∼1.5h (16 spectra covering the range 4300-8000Å). The polarimetric analysis performed starting from the TNG dataset revealed a polarisation degree in the r-band of 3%±1%. From the NOT dataset, due to the lower signal-to-noise ratio, we could obtain only a 3σ upper limit of 3.4%. From the joining of a spectroscopic and photometric analysis, through the study of the equivalent width variations of the CII 7240Å line and the r-band light curve, we could find a hint of a ∼45-min periodicity. A polarisation degree P of ∼3% in the r-band is consistent with the emission of a relativistic particle jet, which is supposed to emit intrinsically linearly polarised synchrotron radiation. Since no variations of P with time have been detected, and the accretion disc of the system does not contain ionised hydrogen, scattering by free electrons in the accretion disc has been rejected. The period of ∼45-min obtained through the analysis of the system light curve and of the equivalent width variations of the selected spectral line is probably linked to the presence of a hot spot or a superhump in the accretion disc, and lead to an orbital period >1h for the binary system.

Abstract Copyright:

Journal keyword(s): stars: jets - stars: neutron - X-rays: binaries - polarisation

VizieR on-line data: <Available at CDS (J/A+A/572/A99): table1.dat table3.dat ew.dat spectrum.dat>

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 BD+52 913 WD* 05 05 30.6182785658 +52 49 51.920797126 10.25 11.44 11.69 11.93 12.108 DA.8 970 0
2 V* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 505 1
3 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 715 0
4 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1004 0
5 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1726 0
6 MAXI J1836-194 XB* 18 35 43.440 -19 19 10.48           ~ 99 0
7 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3878 0
8 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1071 0

    Equat.    Gal    SGal    Ecl

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2020.02.20-00:24:15

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