Finding a 24-day orbital period for the X-ray binary 1A 1118-616

Thumbnail Image

Files

aa15737-10.pdf (835.05 KB)

Links to Files

https://www.aanda.org/articles/aa/abs/2011/03/aa15737-10/aa15737-10.html

Permanent Link

https://doi.org/10.1051/0004-6361/201015737
 http://hdl.handle.net/11603/29868

Collections

UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
UMBC Faculty Collection
UMBC Physics Department

Author/Creator

Author/Creator ORCID

https://orcid.org/0000-0002-4656-6881

Date

2011-01-18

Type of Work

journal articles
Text

Department

Program

Citation of Original Publication

Staubert, R., K. Pottschmidt, V. Doroshenko, J. Wilms, S. Suchy, R. Rothschild, and A. Santangelo. “Finding a 24-Day Orbital Period for the X-Ray Binary 1A 1118-616.” Astronomy & Astrophysics 527 (March 1, 2011): A7. https://doi.org/10.1051/0004-6361/201015737.

Rights

This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
Attribution 4.0 International (CC BY 4.0)

Subjects

Abstract

We report the first determination of the binary period and orbital ephemeris of the Be X-ray binary containing the pulsar 1A 1118-616 (35 years after the discovery of the source). The orbital period is found to be Porb = 24.0 ± 0.4days. The source was observed by RXTE during its last large X-ray outburst in January 2009, which peaked at MJD 54845.4, by taking short observations every few days, covering an elapsed time comparable to the orbital period. Using the phase connection technique, pulse arrival time delays could be measured and an orbital solution determined. The data are consistent with a circular orbit and the time of 90 degrees longitude was found to be Tπ/2 = MJD 54845.37(10), which is coincident with that of the peak X-ray flux.