Aquila X--1: a low inclination soft X-ray transient

Details Aquila X--1: a low inclination soft X-ray transient Aquila X--1: a low inclination soft X-ray transient

1998-01-24

arxiv.org/abs/astro-ph/9801240v1

Astronomy and Astrophysics

Astrophysics

4 pages text, 3 figures, to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.1998.01474.x

We have obtained I-band photometry of the neutron star X-ray transient Aql X--1 during quiescence. We find a periodicity at 2.487 cd-1, which we interpret as twice the orbital frequency (19.30+/-0.05 h). Folding the data on the orbital period, we model the light curve variations as the ellipsoidal modulation of the secondary star. We determine the binary inclination to be 20--31 degrees (90 per cent confidence) and also 95 per cent upper limits to the radial velocity semi-amplitude and rotational broadening of the secondary star to be 117 kms-1 and 50 kms-1 respectively.

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