Discovery of a long-term periodic variation in LMC X-3

Details Discovery of a long-term periodic variation in LMC X-3 Discovery of a long-term periodic variation in LMC X-3

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..526c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. 526-533.

Astronomy and Astrophysics

Astrophysics

43

Stellar Luminosity, Variable Stars, X Ray Binaries, Accretion Disks, Heao 1, Long Term Effects, X Ray Stars

Scientific paper

The highly variable X-ray luminosity of LMC X-3 is found to be strongly modulated with a period of about 198 (or possibly about 99) days. Observations from satellites show this periodic variation. For energies of less than 13 keV, the X-ray intensity and hardness are positively correlated; for higher energies, there appears to be no correlation. Available optical photometry indicates the mean V brightness also varies by more than 1 mag with this same long-term period. The regularity of this 'clock' in LMC X-3 suggests that it may be related to an accretion-disk precession, similar to that seen in LMC X-4, Her X-1, SS 433, or possibly periodic variations in the mass-transfer rate.

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