2005A&A...444..905D


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.16CEST00:40:52

2005A&A...444..905D - Astronomy and Astrophysics, volume 444, 905-912 (2005/12-4)

Doppler tomography of the transient X-ray binary Centaurus X-4 in quiescence.

D'AVANZO P., CAMPANA S., CASARES J., ISRAEL G.L., COVINO S., CHARLES P.A. and STELLA L.

Abstract (from CDS):

We present ESO-NTT low resolution spectroscopy of the neutron star X-ray transient Cen X-4 in quiescence over a complete orbital cycle. Our data reveal the presence of a K3-7 V companion which contributes 63% to the 5600-6900Å flux and orbits the neutron star with a velocity semi-amplitude of K2=145.8±1.0km/s. This, combined with a previous determination of the inclination angle and mass ratio, yields a neutron star and companion mass of M1=1.5±1.0M and M2=0.31±0.27M, respectively. The mass donor is thus undermassive for the inferred spectral type indicating it is probably evolved, in agreement with previous studies. Doppler tomography of the Hα line shows prominent emission located on the companion and a slightly asymmetric accretion disc distribution similar to that seen in systems with precessing eccentric discs. Strong Hα emission from the companion can be explained by X-ray irradiation from the primary. No evidence is found for a hot spot in Hα, whereas one is revealed via Doppler tomography of the HeI lines. This can be interpreted as the hot spot and outer regions of the disc being at a higher temperature than in other systems.

Abstract Copyright:

Journal keyword(s): accretion, accretion discs - binaries: close - stars: individual: Cen X-4 - stars: neutron

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 29697 BY* 04 41 18.8553438360 +20 54 05.447950758 10.064 9.12 7.985 7.313 6.666 K4V 146 0
2 V* KV UMa HXB 11 18 10.7922353051 +48 02 12.319175505     12.25     K5V-M1V 707 0
3 V* GU Mus HXB 11 26 26.5947467816 -68 40 32.888148788   13.60 13.3     K3V-K7V 668 1
4 HD 130970 * 14 51 00.0950336275 -00 15 26.979998792   7.595 6.175     K4III 29 0
5 V* V822 Cen LXB 14 58 21.9350279092 -31 40 07.515505032 11.95 12.85 12.8     K3-K7V 501 0
6 * nu. Lib * 15 06 37.5976214726 -16 15 24.559861419 8.70 6.78 5.20     K5-III 88 0
7 * h Her PM* 16 32 36.2919015 +11 29 16.947932 8.16 6.34 4.85 3.65 2.79 K4.5III 140 0
8 HD 154712 PM* 17 03 18.6604484162 +59 35 07.279801308   9.69   8.0   K4V 64 0
9 V* V2107 Oph HXB 17 08 14.520 -25 05 30.15   16.50 15.9     K3V-K7V 211 1
10 HD 184467 SB* 19 31 07.9709304846 +58 35 09.576438460       7.36   K2V 146 0
11 * 61 Cyg A BY* 21 06 53.9396100677 +38 44 57.897024357 7.50 6.39 5.21 4.19 3.54 K5V 928 0
12 * 61 Cyg B Fl* 21 06 55.2640651855 +38 44 31.362140913 8.63 7.40 6.03 4.86 3.55 K7V 657 1
13 V* LZ Aqr LXB 21 23 14.54 -05 47 52.9 15.90 16.78 16.8     ~ 139 0
14 V* IP Peg DN* 23 23 08.5362716048 +18 24 59.206210572           M2 353 0

    Equat.    Gal    SGal    Ecl

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2019.10.16-00:40:52

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