Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230l.145m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 230, June 15, 1979, p. L145-L148.
Astronomy and Astrophysics
Astronomy
28
Radio Sources (Astronomy), Satellite Observation, Spaceborne Astronomy, X Ray Density Measurement, X Ray Sources, Bremsstrahlung, Heao 1, Luminous Intensity, Spectral Line Width, White Dwarf Stars
Scientific paper
The X-ray source H1908+050 (=4U 1908+05 = A1909+04) was observed for three 6 day periods in 1977 and 1978 with the HEAO A-2 experiment. Because of the positional error box and variability of the source, the unusual emission-line object and variable radio source SS 433 has been suggested as the optical counterpart. The X-ray luminosity of the source varied by a factor of about 2 on a time scale of 6 months, and the spectrum of the object is consistent with either a power law of photon index of 2.1 or with 14.3 KeV thermal bremsstrahlung emission with an about 575 eV equivalent-width iron line. These X-ray characteristics argue against the source being extragalactic, but do not uniquely identify the type of source. The measurements are consistent with emission from a white dwarf with 100 million gauss magnetic field, but are also similar to the X-ray emission sometimes seen from Cir X-1. A search has been made for X-ray emission from similar radio sources, but no new X-ray sources were detected. A previously known source, A1850+00, is a possible counterpart for one of these radio sources.
Boldt Elihu A.
Holt Stephen S.
Marshall Francis E.
Serlemitsos Peter J.
Swank Jean H.
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