2005A&A...429..291S

Query : 2005A&A...429..291S

2005A&A...429..291S - Astronomy and Astrophysics, volume 429, 291-296 (2005/1-1)

The broad-band X-ray spectrum of the dipping low mass X-ray binary EXO 0748-676.

SIDOLI L., PARMAR A.N. and OOSTERBROEK T.

Abstract (from CDS):

We present results of a 0.1-100keV BeppoSAX observation of the dipping low-mass X-ray binary (LMXRB) EXO 0748-676 performed in 2000 November. During the observation EXO 0748-676 exhibited X-ray eclipses, type I X-ray bursts and dipping activity over a wide range of orbital phases. The 0.1-100keV ``dip-free''(i.e. dipping and eclipsing intervals excluded) spectrum is complex, especially at low energies where a soft excess is present. Two very different spectral models give satisfactory fits. The first is the progressive covering model, consisting of separately absorbed black body and cut-off power law components. This model is often used to study the dipping activity in LMXRB. The second model is an absorbed cut-off power law together with a moderately ionized absorber with a sub-solar abundance of Fe and a 2.13keV absorption feature (tentatively identified with SiXIII). This ionized absorber may be the same feature as seen by Chandra during dips from EXO 0748-676. The fact that these two physically very different models both give acceptable fits to the data and plausible values of the best fit parameters indicates how difficult it is to reliably model such complex dipping spectra with moderate spectral resolution data. The blackbody component required by the progressive covering LMXRB model probably has a more complex underlying nature, due to the strong effects of ionized absorption present.

Abstract Copyright: ∼

Journal keyword(s): accretion, accretion disks - stars: individual: EXO 0748-676 - X-rays: general

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 618 0

Query : 2005A&A...429..291S

Basic data :
V* UY Vol -- Low Mass X-ray Binary
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		X (2E,EXO,...), LXB (2013ApJS), V* (2012A&A,V*), * (USNO,WEB), N* (2014MNRAS), SB* (SBC9), N*? (2007ApJS), NIR (DENIS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		07 48 33.71 -67 45 07.7 (Optical) [ 57 17 0 ] D 2003AJ....125..984M
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		07 48 24.93 -67 37 30.7 [ 57 17 0 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		279.97771 -19.81091 [ 57 17 0 ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 20.0 [~] / z(~) 0.000067 [~] / cz 20.00 [~]
   E 1995A&AS..114..269D
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (5) :
U 16.10 [~] D 2007A&A...469..807L
B 17.00 [~] D 2007A&A...469..807L
V 16.9 [~] D 2007A&A...469..807L
R 16.7 [~] E 2003AJ....125..984M
I 17.05 [0.11] D 2005yCat.2263....0D
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (17) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

2E 1882 1RXS J074833.8-674505 V* UY Vol XSS J07480-6746
DENIS J074833.7-674508 SBC9 480 WEB 7511 [KRL2007b] 61
2E 0748.4-6737 SWIFT J0748.8-6743 XB 0748-676
EXO 0748-676 SWIFT J0748.5-6742 XB 0748-68
PBC J0748.6-6744 USNO-B1.0 0222-00189665 2XMM J074833.8-674507

References (618 between 1850 and 2024) (Total 618)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 1    V* : 1    distance : 1   

   

Observing logs


IUE : 3    XMM : 38   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* UY Vol

Link by name to the catalogue in VizieR :

2E 1882 DENIS J074833.7-674508 1RXS J074833.8-674505 USNO-B1.0 0222-00189665 V* UY Vol

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