Soft X-ray transients in quiescence - Observations of AQL X-1 and CEN X-4

Details Soft X-ray transients in quiescence - Observations of AQL X-1 and CEN X-4 Soft X-ray transients in quiescence - Observations of AQL X-1 and CEN X-4

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...182...47v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 182, no. 1, Aug. 1987, p. 47-50.

Astronomy and Astrophysics

Astrophysics

87

Binary Stars, Stellar Luminosity, X Ray Stars, Balmer Series, Exosat Satellite, Stellar Mass Accretion, Visible Spectrum

Scientific paper

The authors observed the soft X-ray transients Aql X-1 and Cen X-4 during quiescence with EXOSAT. For Aql X-1 they obtain a 3σ upper limit to the X-ray luminosity Lx (in the energy range between 0.5 and 4.5 keV) of <3.0×1033erg s-1, Cen X-4 was detected at Lx (0.5 - 4.5 keV) ≅ 1.5 to 4.2×1033erg s-1. An optical spectrum of Cen X-4 obtained two years after its 1979 outburst shows a K3 V continuum with Balmer emission lines. Combining their EXOSAT observations with a previous EINSTEIN detection the authors argue that the X-ray luminosity of Cen X-4 is due to continued accretion, and not to thermal radiation of a cooling neutron star.

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