2008A&A...486..911N


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.20CEST06:14:23

2008A&A...486..911N - Astronomy and Astrophysics, volume 486, 911-917 (2008/8-2)

Unveiling the nature of six HMXBs through IR spectroscopy.

NESPOLI E., FABREGAT J. and MENNICKENT R.E.

Abstract (from CDS):

The International Gamma-Ray Astrophyiscs Laboratory (INTEGRAL) is discovering a large number of new hard X-ray sources, many of them being HMXBs. The identification and spectral characterization of their optical/infrared counterparts is a necessary step to undertake detailed study of these systems. In particular, the determination of the spectral type is crucial in the case of the new class of Supergiant Fast X-ray Transients (SFXTs), which show X-ray properties common to other objects. Our goal is to perform spectral analysis and classification of proposed counterparts to HMXBs in order to characterize the system they belong to. We used the ESO/NTT SofI spectrograph to observe proposed IR counterparts to HMXBs, obtaining Ks medium resolution spectra (R=1320) with a S/N>100. We classified them through comparison with published atlases. We were able to spectrally classify the six sources. This allowed us to ascribe one of them to the new class of SFXTs and confirm the membership of two sources to this class. We confirmed the spectral classification, derived from optical spectroscopy, of a known system, 4U 1907-09, showing for the first time its infrared spectrum. The spectral classification was also used to estimate the distance of the sources. We compared the extinction as derived from X-ray data with effective interstellar extinction obtained from our data, discussing the absorption component due to the circumstellar environment, which we observed in four systems; in particular, intrinsic absorption seems to emerge as a typical feature of the entire class of SFXTs.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: supergiants - accretion, accretion disks - infrared: stars

CDS comments: Abstract : 4U 1907-09 is a misprint for 4U 1907+09. Paragraph.2. IGR J16749-4514 is a probable misprint for IGR J16479-4514. Paragraph.3.1.1. USNO-B1.0 0384-0560857 is a misprint for USNO-B1.0 0384-0560875. Figure 6. IGR J19140+0591 is a misprint for IGR J19140+0951.

Simbad objects: 19

goto Full paper

goto View the reference in ADS

Number of rows : 19

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 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5375 1
2 * alf Cam s*b 04 54 03.0103983 +66 20 33.636467 3.47 4.34 4.29 4.18 4.18 O9Ia 633 1
3 HD 306414 s*b 11 21 46.8237210288 -59 51 47.969821291 10.12 10.69 10.23 10.00   B1Ia 132 0
4 HD 112244 s*b 12 55 57.1346044550 -56 50 08.891958192 4.49 5.33 5.32 5.21 5.21 O8.5Iab(f)p 191 0
5 NAME Nor Arm PoG 16 00 -50.0           ~ 315 0
6 CXOU J162046.2-513006 HXB 16 20 46.2655398336 -51 30 06.046848280   18.9   16.28 13.4 B8IIIe 56 0
7 2MASS J16463526-4507045 HXB 16 46 35.2592332854 -45 07 04.609816032   15.2       O9.5Ia 87 1
8 2MASS J16480656-4512068 HXB 16 48 06.56 -45 12 06.8           O8.5Iab 117 2
9 HD 154368 s*b 17 06 28.3687923960 -35 27 03.759955171 6.10 6.63 6.13 7.12   O9.5Iab 259 0
10 AX J1739.1-3020 HXB 17 39 11.5521531365 -30 20 37.783172824   17.0 14.8     O8.5Iab(f) 141 0
11 HD 169454 s*b 18 25 15.1938696996 -13 58 42.305035144 7.39 7.61 6.71 5.82 5.13 B1Ia 305 0
12 [KRL2007b] 332 HXB 18 41 00.43 -05 35 46.5           B1Ib 115 1
13 USNO-A2.0 0825-12601262 * 18 41 00.4359706898 -05 35 46.474178793   15.91       ~ 10 1
14 NAME Sgr Arm PoG 19 00 -30.0           ~ 496 1
15 4U 1907+09 HXB 19 09 37.9 +09 49 49   19.41 16.35 14.40 12.53 O8.5Iab 304 1
16 2MASS J19093804+0949473 IR 19 09 38.0514820717 +09 49 47.265886646           ~ 1 1
17 INTEGRAL1 111 HXB 19 14 04.2269997048 +09 52 58.398334234   18.6 16.4     B0.5I 87 0
18 Schulte 18 * 20 33 30.7902492275 +41 15 22.690816786 13.38 12.54 10.860     B1I 44 0
19 NAME Scutum Spiral Arm PoG ~ ~           ~ 256 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...486..911N and select 'bookmark this link' or equivalent in the popup menu


2019.10.20-06:14:23

© Université de Strasbourg/CNRS

    • Contact