Optical Observations of 4U 1915-05, and the Stability of the Long Term Ephemeris

Details Optical Observations of 4U 1915-05, and the Stability of the Long Term Ephemeris Optical Observations of 4U 1915-05, and the Stability of the Long Term Ephemeris

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..153c&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.153-162.

Astronomy and Astrophysics

Astronomy

21

Binaries: Close, Stars: Individual (4U 1915-05), X-Rays: Stars

Scientific paper

We present the results of a comprehensive campaign of optical photometry of the dipping and bursting Low Mass X-ray Binary 4U 1915-05 (hereafter 1915-05). During 1990 September we monitored 1915-05 while the system was in an anomalously faint optical state. We find clear evidence for the presence of both the X-ray and optical periods in the data, although at phases which preclude a simple interpretation on the basis of standard models. Optical dips at phase ~ 0.5 were also observed. We show that the intrinsic luminosity of the disk may well make a significant contribution to the overall optical flux of the system, increasing the detectability of any SU UMa--like, precessing behavior. We also discuss our long term, 7 year database of 1915-05 photometry, and show that the mean optical modulation can be apparently described by a simple ephemeris over this timescale. This suggests that the optical modulation indeed represents the binary period: however, further observations are still required to confirm or otherwise the proposed long term phase stability.

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