Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.4411w&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #44.11; Bulletin of the American Astronomical Society, Vol. 29, p.1279
Astronomy and Astrophysics
Astronomy
1
Scientific paper
We have obtained simultaneous optical photometry and spectroscopy of the low mass X-ray binary (and Z-source) GX 349+2 with the CTIO 0.9 m and 4 m telescopes in July 1997. The spectrum of GX 349+2 only shows strong, narrow Hα emission. The observed radial velocities indicate that our previously reported 22 hour photometric modulation is indeed the orbital period. We find gamma =-250+/-10 km s(-1) and K=65+/-6 km s(-1) for the systemic and semi-amplitude velocities respectively. The photometric light curve and radial velocity curve are offset by 0.25 in phase. Doppler tomography shows the Hα emission centered on the position of the neutron star. The relative phasing implies that the photometric variability is probably caused by the heated face of the companion star while the Hα emission may arise in an accretion disk and traces the motion of the neutron star. It also indicates that the emission region is symmetric around the neutron star. If the Hα emission does originate in the accretion disk, the narrowness of the line suggests a low inclination for the system.
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