Infrared spectroscopy of the black hole candidate gro j1655 40
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Infrared Spectroscopy of the Black Hole Candidate GRO J1655-40. Francis T. O’Donovan based on. Ay 101. BH = remnant from death of a massive star. How observe? - Binary star systems! X-ray binaries. XT - X-ray Transient system. Light curve - Ellipsoidal variability. GRO J1655-40.

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Infrared Spectroscopy of the Black Hole Candidate GRO J1655-40

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Infrared spectroscopy of the black hole candidate gro j1655 40

Infrared Spectroscopy of theBlack Hole CandidateGRO J1655-40

Francis T. O’Donovan

based on


Ay 101

Ay 101

  • BH = remnant from death of a massive star.

  • How observe? - Binary star systems!

  • X-ray binaries.

  • XT - X-ray Transient system.

  • Light curve - Ellipsoidal variability.


Gro j1655 40

GRO J1655-40

  • Discovered in July 1994 by CGRO.

  • X-ray Transient. Harbors a BH?

  • Superluminal jets. Model for AGN?!


Infrared spectroscopy of the black hole candidate gro j1655 40

166”x166” CTIO CIRIM image (K-band, 30s exposure)


Observations made

Observations Made

  • Keck II NIRSPEC spectrograph.

  • First high S/N ratio K-band (IR) spectrum of a BH XT system.

  • Looking for disk emission.


Atomic spectral line

Atomic Spectral Line

  • Br- or HI (4-7) @  = 21661.20Å.

  • HeI (0-1) @  = 20586.900Å.

  • FeI (5-4) @  = 20701.122Å.

  • SiI (2-1) @  = 21360.055Å.

  • TiI] (2-3) @  = 21890.0Å.


Spectroscopic data analysis

Spectroscopic Data Analysis

  • Spectra of isolated stars from spectral atlas of Wallace & Hinkle (1997).


Spectroscopic data analysis1

Spectroscopic Data Analysis

  • Spectra of isolated stars from spectral atlas of Wallace & Hinkle (1997).

  • Equivalent widths: Absorption spectrum similar to that ofa F5-F7 III-IV star.


Spectroscopic data analysis2

Spectroscopic Data Analysis

  • Spectra of isolated stars from spectral atlas of Wallace & Hinkle (1997).

  • Equivalent widths: Absorption spectrum similar to that ofa F5-F7 III-IV star.

  • No emission  negligible disk contribution!


Modeling

Modeling

Mx ~ 7 Ms.


Comments and conclusions

Comments and Conclusions

  • Derived values comparable with previous studies.

  • But a unique determination of disk contribution.


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