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 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:
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RA (2000) DE Designation(s)
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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
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 99 206 Spectroscopy results
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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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
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Note (1): T stands for telluric.
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Acknowledgements:
Sylvain Chaty,
(End) Patricia Vannier [CDS] 19-May-2008