Simultaneous NICER and NuSTAR Observations of the Ultracompact X-Ray Binary 4U 1543–624

The Orbital Period of the Ultracompact Low-mass X-ray Binary 4u 1543–624

We report the discovery of the orbital period of the ultracompact low-mass X-ray binary (LMXB) 4U 1543−624 using time-resolved optical photometry taken with the 6.5-m Clay (Magellan II) telescope in Chile. The light curve in the Sloan r band clearly shows a periodic, sinusoidal modulation at 18.2±0.1 min with a fractional semiamplitude of 8%, which we identify as the binary period. This is the ...

NuSTAR Observations of X-Ray Binaries

Nustar and Xmm-newton Observations of the Neutron Star X-ray Binary 1rxs J180408.9-34205

We report on observations of the neutron star (NS) residing in the low-mass X-ray binary 1RXS J180408.934205 taken 2015 March by NuSTAR and XMM-Newton while the source was in the hard spectral state. We find multiple reflection features (Fe Kα detected with NuSTAR; N VII, O VII, and O VIII detected in the RGS) from different ionization zones. Through joint fits using the self consistent relativ...

Simultaneous radio and X-ray observations of the low-mass X-ray binary GX 13+1

We present the results of two simultaneous X-ray/radio observations of the low-mass X-ray binary GX 13+1, performed in July/ August 1999 with the Rossi X-ray Timing Explorer and the Very Large Array. In X-rays the source was observed in two distinct spectral states; a soft state, which had a corresponding 6 cm flux density of ∼0.25 mJy, and a hard state, which was much brighter at 1.3–7.2 mJy. ...

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