Access to Astronomical Catalogues

← Click to display the menu
J/A+A/484/783       Spectroscopy of 7 INTEGRAL X-ray sources      (Chaty+, 2008)

Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. I. The nature of the companion star. Chaty S., Rahoui F., Foellmi C., Tomsick J.A., Rodriguez J., Walter R. <Astron. Astrophys. 484, 783 (2008)> =2008A&A...484..783C
ADC_Keywords: Binaries, X-ray ; Gamma rays ; Spectroscopy Keywords: infrared: stars - X-rays: binaries - X-rays: general - stars: supergiants Abstract: The INTEGRAL hard X-ray observatory has revealed an emerging population of highly obscured X-ray binary systems through multi-wavelength observations. Previous studies have shown that many of these sources are high-mass X-ray binaries hosting neutron stars orbiting around luminous and evolved companion stars. To better understand this newly-discovered population, we have selected a sample of sources for which an accurate localisation is available to identify the stellar counterpart and reveal the nature of the companion star and of the binary system. Description: We performed an intensive study of a sample of thirteen INTEGRAL sources, through multi-wavelength optical to NIR photometric and spectroscopic observations, using EMMI and SofI instruments at the ESO-NTT telescope. We performed accurate astrometry and identified candidate counterparts for which we give the optical and NIR magnitudes. We detected many spectral lines allowing us to determine the spectral type of the companion star. We fitted with stellar black bodies the mid-infrared to optical spectral energy distributions of these sources. From the spectral analysis and SED fitting we identified the nature of the companion stars and of the binary systems. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 16 32 01.9 -47 52 27 IGR J16320-4751 = INTEGRAL1 25 16 35 58. -47 24 24 IGR J16358-4726 = INTEGRAL1 28 16 47 59. -45 13 00 IGR J16479-4514 = INTEGRAL1 33 17 25 11.4 -36 16 59 IGR J17252-3616 = INTEGRAL1 53 17 39 11.6 -30 20 38 IGR J17391-3021 = AX J1739.1-3020 18 02 39.9 -20 17 13 IGR J18027-2016 = INTEGRAL1 81 19 14 02. +09 53 18 IGR J19140+0951 = INTEGRAL1 111 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table8.dat 99 206 Spectroscopy results
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [IGR] 5- 15 A11 --- IGR IGR source designation (JHHMMm+DDMM) 17- 36 A20 --- Ident Identification of the lines (1) 38- 43 F6.4 um lambda ? Rest wavelength 44 A1 --- --- [/-] 45- 50 F6.4 um lam.2 ? Second rest wavelength 52- 57 F6.4 um lam.fit Fitted central wavelength 59- 74 E16.14 --- Flux Flux (in mW/m2 = erg/cm2/s for optical spectra and in arbitrary units for NIR spectra) 76- 86 F11.6 0.1nm EW ?=- Equivalent width 88- 90 F3.1 0.1nm e_EW ? rms uncertainty on EW 93- 99 F7.3 0.1nm FWHM Full Width Half Maximum
Note (1): T stands for telluric.
Acknowledgements: Sylvain Chaty,
(End) Patricia Vannier [CDS] 19-May-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact