Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543116i&link_type=abstract
American Astronomical Society, AAS Meeting #215, #431.16; Bulletin of the American Astronomical Society, Vol. 42, p.365
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new infrared observations of the bow shock of the high mass X-ray binary (HMXB) Vela X-1 obtained with the Spitzer Space Telescope. Vela X-1 is an X-ray pulsar, actually one of the most massive neutron stars known, accompanied by a B supergiant. Infrared images in the two MIPS bands (24 and 70 microns) and the four IRAC bands (3.6, 4.5, 5.8, and 8.0 microns) are augmented by IRS spectroscopy of three positions along the bow shock. Bow shocks provide a way to probe their energetic environments and reveal properties of both the stellar wind and the ambient interstellar medium. The presence of a bow shock indicates that the system has a high (supersonic) velocity with respect to the interstellar medium, in the process of which dust and gas is accumulated. The strong UV and X-ray radiation fields of this system may contribute to heating the dust. The MIPS and IRAC images show filamentary structures with strong intensity variations that vary with wavelength. We detect several emission features in the IRS spectra.
Iping Rosina
Kaper Lex
Sonneborn George
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