On the distance of GRO J1655-40

Abstract

We challenge the accepted distance of 3.2 kpc of GRO J1655-40. We present VLT-UVES spectroscopic observations to estimate the absorption toward the source, and determine a maximum distance of GRO J1655-40. We show that the accepted value of 3.2 kpc is taken for granted by many authors. We retrieved in the ESO archive UVES spectra taken in April 2004 when GRO J1655-40 was in quiescence to determine the spectral type of the secondary star. For the first time we build a flux-calibrated mean (UVES) spectrum of GRO J1655-40 and compare its observed flux to that of five nearby stars of similar spectral types. We strengthen our results with the traditional pair method, using published photometric data of the comparison stars. We show that the distance of 3.2 kpc is questionable. We determine a spectral type F6IV for the secondary star. We demonstrate in details that the distance of GRO J1655-40 must be smaller than 1.7 kpc. The runaway black hole GRO J1655-40 could be associated with the open cluster NGC 6242 which is located at 1.0$\pm$0.1 kpc from the Sun. At $D\le$ 1.7 kpc the jets are not a superluminal, and GRO J1655-40 becomes one of the closest known black holes to the Sun.

9 pages, 6 figures, accepted for publication in Astronomy & Astrophysics. Small correction of distance range values using the photometric method. (re-accepted by A&A)

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• The high energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst
• The highly ionized disk wind of GRO J1655-40
• On the abundances of GRO J1655-40
• Accretion Disc Evolution in GRO J1655-40 and LMC X-3 with Relativistic and Non-Relativistic Disc Models
• Identifying four $INTEGRAL$ sources in the Galactic Plane via VLT/optical and $XMM$-$Newton$/X-ray spectroscopy
• New evidence on the origin of the microquasar GRO J1655-40
• Testing Relativistic Accretion Disk Models with GRO J1655-40