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Title: The clumpy absorber in the high-mass X-ray binary Vela X-1

Journal Article · · Astronomy and Astrophysics
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [7];  [9];  [10];  [11];  [6];  [8];  [9];  [8]
  1. ESA European Space Research and Technology Centre (ESTEC), Noordwijk (Netherlands)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Catholic Univ. of Leuven (KU Leuven) (Belgium). Centre for Mathematical Plasma Astrophysics. Dept. of Mathematics
  4. Villanova Univ., PA (United States). Dept. of Physics
  5. Univ. of Potsdam (Germany). Inst. of Physics and Astronomy
  6. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States). Dept. of Physics. Center for Research and Exploration in Space Science & Technology (CRESST); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  7. ESA European Space Astronomy Centre (ESAC), Madrid (Spain). Science Operations Dept.
  8. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Kavli Inst. for Astrophysics and Space Research
  9. Univ. of Erlangen-Nuremberg, Bamberg (Germany). Dr. Karl Remeis-Sternwarte. Erlangen Centre for Astroparticle Physics (ECAP)
  10. CSIC Univ. of Cantabria, Santander (Spain). Inst. of Physics of Cantabria
  11. Univ. of Erlangen-Nuremberg, Bamberg (Germany). Dr. Karl Remeis-Sternwarte. Erlangen Centre for Astroparticle Physics (ECAP); Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Astronomical Observatory
+ Show Author Affiliations

Bright and eclipsing, the high-mass X-ray binary Vela X-1 offers a unique opportunity to study accretion onto a neutron star from clumpy winds of O/B stars and to disentangle the complex accretion geometry of these systems. In Chandra-HETGS spectroscopy at orbital phase ~0.25, when our line of sight towards the source does not pass through the large-scale accretion structure such as the accretion wake, we observe changes in overall spectral shape on timescales of a few kiloseconds. This spectral variability is, at least in part, caused by changes in overall absorption and we show that such strongly variable absorption cannot be caused by unperturbed clumpy winds of O/B stars. We detect line features from high and low ionization species of silicon, magnesium, and neon whose strengths and presence depend on the overall level of absorption. Finally, these features imply a co-existence of cool and hot gas phases in the system, which we interpret as a highly variable, structured accretion flow close to the compact object such as has been recently seen in simulations of wind accretion in high-mass X-ray binaries.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); ESA European Space Research and Technology Centre (ESTEC), Noordwijk (Netherlands); Catholic Univ. of Leuven (KU Leuven) (Belgium); Univ. of Erlangen-Nuremberg, Bamberg (Germany)
Sponsoring Organization:
USDOE; National Aeronautics and Space Administration (NASA); European Union (EU); Research Foundation Flanders (FWO) (Belgium); German Research Foundation (DFG)
Grant/Contract Number:
AC52-07NA27344; SV3-73016; NAS8-03060; HST-HF2-51343.001-A; 665501; HA 1455/26
OSTI ID:
1438665
Report Number(s):
LLNL-JRNL-737837; TRN: US1900479
Journal Information:
Astronomy and Astrophysics, Vol. 608; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

References (86)

The [ITAL]Chandra[/ITAL] High-Energy Transmission Grating Observation of an X-Ray Ionization Cone in Markarian 3 journal November 2000
On the nature of ‘off’ states in slowly rotating low-luminosity X-ray pulsars journal October 2012
A CHANDRA SURVEY OF FLUORESCENCE Fe LINES IN X-RAY BINARIES AT HIGH RESOLUTION journal May 2010
High variability in Vela X-1: giant flares and off states journal October 2008
Resolving the Effects of Resonant X‐Ray Line Scattering in Centaurus X‐3 with Chandra journal January 2003
Origin of the Soft Excess in X‐Ray Pulsars journal October 2004
The accretion environment in Vela X-1 during a flaring period using XMM-Newton journal March 2014
Ariel V Sky Survey : Observations of the Accretion Wake in Vel X-1 journal July 1975
Ratio of Line Intensities in Helium-Like Ions as a Density Indicator. journal February 1972
Two-phase models of quasar emission line regions journal October 1981
Tenma observations of bright binary X-ray sources journal February 1985
Energy levels of one‐electron atoms journal July 1977
The Ionized Stellar Wind in Vela X-1 during Eclipse journal January 2002
On the Radial Onset of Clumping in the wind of the b0i Massive star qv nor journal September 2015
X‐Ray Spectral Study of the Photoionized Stellar Wind in Vela X‐1 journal November 2006
Interpretation of Solar Helium-Like Ion Line Intensities journal July 1969
Laboratory Measurements of the K-Shell Transition Energies in L-Shell ions of si and s journal October 2016
An XMM-Newton view of FeK α in high-mass X-ray binaries journal April 2015
UHURU Observations of the Binary X-Ray Source 2u 0900-40 journal May 1973
Binary Nature of the B Supergiant in the Error Box of the VELA X-Ray Source journal July 1972
SHORT-TERM VARIABILITY OF X-RAYS FROM ACCRETING NEUTRON STAR VELA X-1. I. SUZAKU OBSERVATIONS journal March 2013
Hydrodynamic simulations of stellar wind disruption by a compact X-ray source journal June 1990
A Grid of NLTE Line‐blanketed Model Atmospheres of Early B‐Type Stars journal March 2007
Coupling hydrodynamics with comoving frame radiative transfer: I. A unified approach for OB and WR stars journal July 2017
Neutron Stars in Interacting Binary Systems journal September 1984
Theoretical energies for the n  = 1 and 2 states of the helium isoelectronic sequence up to Z  = 100 journal July 1988
XMM‐Newton Reflection Grating Spectrometer Observations of Discrete Soft X‐Ray Emission Features from NGC 1068 journal August 2002
Mass Loss by Hot Stars journal January 1970
Measurements and Analysis of Helium‐like Triplet Ratios in the X‐Ray Spectra of O‐Type Stars journal October 2006
X-Ray Photoionized Bubble in the wind of vela x-1 Pulsar Supergiant Companion journal September 2012
The X‐Ray Spectrum and Global Structure of the Stellar Wind in Vela X‐1 journal November 1999
Black holes in X-ray binaries - Marginal existence and rotation reversals of accretion disks journal February 1976
Arcus: an ISS-attached high-resolution x-ray grating spectrometer conference July 2014
Laboratory Measurements and Modeling of the Fe xvii X‐Ray Spectrum journal August 1998
Line ratios for helium-like ions: Applications to collision-dominated plasmas journal September 2001
Line absorption of He-like triplet lines by Li-like ions: Caveats of using line ratios of triplets for plasma diagnostics journal July 2015
A new model for the X-ray continuum of the magnetized accreting pulsars journal June 2016
Theoretical Wavelengths for Ka-TYPE X-Ray Lines in the Spectra of Ionized Atoms (carbon to Copper) journal February 1969
Time-dependent models of radiatively driven stellar winds. I - Nonlinear evolution of instabilities for a pure absorption model journal December 1988
Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system : II. The non-dip spectrum in the low/hard state – modulations with orbital phase journal May 2016
Long term variability of Cygnus X-1: VII. Orbital variability of the focussed wind in Cyg X-1/HDE 226868 system⋆ journal April 2015
Modeling of iron K lines: Radiative and Auger decay data for $\ion{Fe}{ii}$–$\ion{Fe}{ix}$ journal October 2003
High‐Resolution X‐Ray Spectroscopy of a Low‐Luminosity Active Galactic Nucleus: The Structure and Dynamics of M81* journal November 2007
Clumping in the inner winds of hot, massive stars from hydrodynamical line-driven instability simulations journal November 2012
No anticorrelation between cyclotron line energy and X-ray flux in 4U 0115+634 journal February 2013
Origin of the X-ray off-states in Vela X-1 journal February 2015
Laboratory Measurements and Identification of the Fe xviii – xxiv L‐Shell X‐Ray Line Emission journal June 2002
Variation in Emission and Absorption Lines and Continuum Flux by Orbital Phase in Vela X-1 journal April 2004
Pulse Phase‐Resolved Analysis of the High‐Mass X‐Ray Binary Centaurus X‐3 over Two Binary Orbits journal March 2008
Probing the stellar wind environment of Vela X–1 with MAXI journal March 2016
X-ray photoionized plasma diagnostics with helium-like ions. Application to warm absorber-emitter in active galactic nuclei journal May 2000
THE NuSTAR X-RAY SPECTRUM OF HERCULES X-1: A RADIATION-DOMINATED RADIATIVE SHOCK journal November 2016
Theory of quasi-spherical accretion in X-ray pulsars: Quasi-spherical accretion journal December 2011
Atomic Data for Astrophysics. II. New Analytic FITS for Photoionization Cross Sections of Atoms and Ions journal July 1996
Clumped stellar winds in supergiant high-mass X-ray binaries: X-ray variability and photoionization: Clumped stellar winds in HMXBs journal March 2012
Chandra X-ray spectroscopy of the very early O supergiant HD 93129A: constraints on wind shocks and the mass-loss rate: HD 93129A Chandra spectroscopy journal June 2011
CHANDRA X-RAY SPECTROSCOPY OF THE FOCUSED WIND IN THE CYGNUS X-1 SYSTEM. I. THE NONDIP SPECTRUM IN THE LOW/HARD STATE journal December 2008
Shock-Generated Vorticity in the Interstellar Medium and the Origin of the Stellar Initial mass Function journal August 2009
Short-Term Variability of X-Rays from Accreting Neutron star vela x-1. ii. Monte Carlo Modeling journal December 2013
TGCat : THE CHANDRA TRANSMISSION GRATING DATA CATALOG AND ARCHIVE journal March 2011
Probing large-scale wind structures in Vela X–1 using off-states with INTEGRAL journal December 2014
Towards a Unified View of Inhomogeneous Stellar Winds in Isolated Supergiant Stars and Supergiant High Mass X-Ray Binaries journal March 2017
Beyond XSPEC: Toward Highly Configurable Astrophysical Analysis journal July 2008
The Chandra High‐Energy Transmission Grating: Design, Fabrication, Ground Calibration, and 5 Years in Flight
  • Canizares, Claude R.; Davis, John E.; Dewey, Daniel
  • Publications of the Astronomical Society of the Pacific, Vol. 117, Issue 836 https://doi.org/10.1086/432898
journal October 2005
Parameter estimation in astronomy through application of the likelihood ratio journal March 1979
Experimental study of the x-ray transitions in the heliumlike isoelectronic sequence journal July 1989
Footprints in the wind of Vela X–1 traced with MAXI journal May 2013
X-ray emission from the winds of hot stars journal October 1980
The Interaction of X-Ray Sources with Optically Thin Environments journal June 1969
Modelling the orbital modulation of ultraviolet resonance lines in high-mass X-ray binaries journal August 2001
Inner‐Shell 1 s –2 p Soft X‐Ray Absorption Lines journal May 2002
High resolution X-ray spectroscopy of ζ Puppis with the XMM-Newton reflection grating spectrometer journal January 2001
2D wind clumping in hot, massive stars from hydrodynamical line-driven instability simulations using a pseudo-planar approach journal March 2018
Studies in Astronomical time Series Analysis. vi. Bayesian Block Representations journal February 2013
Measuring the stellar wind parameters in IGR J17544-2619 and Vela X-1 constrains the accretion physics in supergiant fast X-ray transient and classical supergiant X-ray binaries journal June 2016
X-ray variation statistics and wind clumping in Vela X-1 journal September 2010
The X-ray absorption spectrum of VELA X-1 journal September 1990
Low charge states of Si and S in Cygnus X-1 journal September 2013
Thermal and Bulk Comptonization in Accretion‐powered X‐Ray Pulsars journal January 2007
Discovery of a 283-second periodic variation in the X-ray source 3U 0900-40 journal June 1976
Non-linear X-ray variability in X-ray binaries and active galaxies journal May 2005
On the Absorption of X‐Rays in the Interstellar Medium journal October 2000
Photoionization Modeling and the K Lines of Iron journal December 2004
NuSTAR DISCOVERY OF A LUMINOSITY DEPENDENT CYCLOTRON LINE ENERGY IN VELA X-1 journal December 2013
The mass of the neutron star in Vela X-1 and tidally induced non-radial oscillations in GP Vel journal March 2003
Dielectronic Satellite Spectra for Highly-Charged Helium-Like Ion Lines journal October 1972

Cited By (8)

Highly charged ions in a new era of high resolution X‐ray astrophysics journal April 2019
Clumpy wind accretion in Supergiant X-ray Binaries journal August 2018
Chandra reveals a possible ultrafast outflow in the super-Eddington Be/X-ray binary Swift J0243.6+6124 journal June 2019
New Constraints on the Geometry and Kinematics of Matter Surrounding the Accretion Flow in X-Ray Binaries from Chandra High-energy Transmission Grating X-Ray Spectroscopy journal March 2018
A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472 journal November 2019
Chandra reveals a possible ultra-fast outflow in the super-Eddington Be/X-ray binary Swift J0243.6+6124 text January 2019
A Comprehensive Chandra Study of the Disk Wind in the Black Hole Candidate 4U 1630-472 text January 2019
Advances in Understanding High-Mass X-ray Binaries with INTEGRAL and Future Directions text January 2020

Figures / Tables (22)

Fig. 1(p. 4)figure Fig. 1
Fig. 2(p. 5)figure Fig. 2
Fig. 3(p. 5)figure Fig. 3
Table 1(p. 5)table Table 1
Fig. 4(p. 6)figure Fig. 4
Fig. 5(p. 6)figure Fig. 5
Table 2(p. 7)table Table 2
Table 3(p. 7)table Table 3
Fig. 6(p. 8)figure Fig. 6
Fig. 7(p. 9)figure Fig. 7
Table 4(p. 9)table Table 4
Table 5(p. 9)table Table 5
Fig. 8(p. 10)figure Fig. 8
Fig. 9(p. 11)figure Fig. 9
Table 6(p. 11)table Table 6
Fig. 10(p. 13)figure Fig. 10
Table 7(p. 13)table Table 7
Table 8(p. 13)table Table 8
Fig. 11(p. 14)figure Fig. 11
Fig. 12(p. 14)figure Fig. 12
Fig. 13(p. 16)figure Fig. 13
Fig. 14(p. 18)figure Fig. 14

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
x-rays
Vela X-1
binary x-rays
stars
winds
outflows
massive stars