Periodic UV modulation of X1850-087: a double degenerate binary in the globular cluster NGC 6712?

Details Periodic UV modulation of X1850-087: a double degenerate binary in the globular cluster NGC 6712? Periodic UV modulation of X1850-087: a double degenerate binary in the globular cluster NGC 6712?

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.282l..37h&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 282, Issue 3, pp. L37-L46.

Astronomy and Astrophysics

Astronomy

39

Binaries: Close, Stars: Individual: X1850-087, Globular Clusters: Individual: Ngc 6712, X-Rays: Stars

Scientific paper

We report the discovery with the Hubble Space Telescope (HST) of a short-period (20.6 min) UV modulation in X1850-087, the luminous X-ray source in the globular cluster NGC 6712. The low-amplitude modulation (0.044+/-0.007 mag) is not detected in archival X-ray observations with EXOSAT. We compare the properties of X1850-087 with the 11-min binary X1820-303 and identify the modulation as the orbital period, which requires the mass-losing companion to be degenerate and of low mass (0.04 M_solar).

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