Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...436..661c&link_type=abstract
Astronomy and Astrophysics, Volume 436, Issue 2, June III 2005, pp.661-669
Astronomy and Astrophysics
Astrophysics
16
Stars: Binaries: Close, Stars: Early-Type, Stars: Winds, Outflows, X-Rays: Individual: 4U 1907+09, Ism: Lines And Bands
Scientific paper
High-resolution optical spectra of the high-mass X-ray binary 4U 1907+09 covering the wavelength range 4680-10 400 Å indicate that the X-ray pulsar's massive companion is an O8/O9 supergiant with a dense stellar wind. The interstellar atomic lines of Na I and K I of this strongly reddened source ({E}(B-V) = 3.45 mag) are used to set a lower limit to its distance: d ≈ 5 kpc, excluding the possibility that the massive companion is a Be star. We re-evaluate the system parameters; the new spectral classification of 4U 1907+09's O supergiant companion is discussed in the context of its similarity in X-ray and orbital properties to Wray 15-977/GX 301-2. The Hα line shows variability similar to what is observed in other wind-fed systems. A remarkable feature is the strong He ii 4686 Å emission line, which possibly originates in the accretion flow towards the X-ray pulsar.
Cox Nick L. J.
Kaper Lex
Mokiem M. R.
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