Francis T. O’Donovan based on Infrared Spectroscopy of the Black Hole Candidate GRO J1655-40.

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Presentation transcript:

Francis T. O’Donovan based on Infrared Spectroscopy of the Black Hole Candidate GRO J

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 J Discovered in July 1994 by CGRO. X-ray Transient. Harbors a BH? Superluminal jets. Model for AGN?!

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

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 Br-  or HI = Å. HeI = Å. FeI = Å. SiI = Å. TiI] = Å.

Spectroscopic Data Analysis Spectra of isolated stars from spectral atlas of Wallace & Hinkle (1997).

Spectroscopic Data Analysis Spectra of isolated stars from spectral atlas of Wallace & Hinkle (1997). Equivalent widths: Absorption spectrum similar to that of a F5-F7 III-IV star.

Spectroscopic Data Analysis Spectra of isolated stars from spectral atlas of Wallace & Hinkle (1997). Equivalent widths: Absorption spectrum similar to that of a F5-F7 III-IV star. No emission  negligible disk contribution!

Modeling M x ~ 7 M s.

Derived values comparable with previous studies. But a unique determination of disk contribution. Comments and Conclusions