- Author
- Year
- 2012
- Title
- The near-infrared counterpart of 4U 1636-53
- Journal
- Astronomy & Astrophysics
- Volume
- 539
- Pages (from-to)
- A53
- Number of pages
- 4
- Document type
- Article
- Faculty
- Faculty of Science (FNWI)
- Institute
- Anton Pannekoek Institute for Astronomy (API)
- Abstract
-
Context. The optical counterpart of the neutron star X-ray binary and well known X-ray burster, 4U 1636-53 (=4U 1636-536 = V801 Ara) has been studied for three decades. However, no infrared studies have been reported to date.
Aims. Our aims are to identify and investigate the near-infrared (NIR) counterpart of 4U 1636-53.
Methods. We present deep, KS-band (2.2 μm) imaging of the region of 4U 1636-53 taken with the Infrared Spectrometer And Array Camera (ISAAC) on the Very Large Telescope. Archival optical and UV data were used to infer the 0.2−2.2 μm spectral energy distribution (SED).
Results. One star is located at coordinates α = 16:40:55.57, δ = −53:45:05.2 (J2000; 1σ positional uncertainty of ~0.3 arcsec), which is consistent with the known optical position of 4U 1636-53; its magnitude is KS = 16.14 ± 0.12. This star is also detected in the 2MASS survey in the J-band and has a magnitude of J = 16.65 ± 0.22. Assuming that the persistent emission is quite steady, the 0.4−2.2 μm de-reddened SED can be described by a power law Fν ∝ ν1.5 ± 0.3, with some possible curvature (Fν ∝ ν ≲ 1.5) at 0.2−0.4 μm. The SED can be approximated by a blackbody of temperature ~27 000 K. This is typical for an active low-mass X-ray binary, and the emission can be explained by the outer regions of a (likely irradiated) accretion disc. We therefore interpret this KS-band star as the NIR counterpart. - URL
- go to publisher's site
- Language
- English
- Persistent Identifier
- https://hdl.handle.net/11245/1.382028
- Downloads
-
near-infrared_counterpart.pdf(Final published version)
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