Skip to main content Accessibility help

Study of Pulsations in the Nova-like Variable KR Aur and the Intermediate Polar BG CMi

  • J. Singh (a1), P. C. Agrawal (a1), M. V. K. Apparao (a1), R. K. Manchanda (a1), P. Vivekananda Rao (a2) and M. B. K. Sarma (a2)...


Fast photometric observations of a nova-like variable KR Aurigae and the intermediate polar BG CMi (3A0729+103) were made in the B and U bands during 1984–89 to study pulsations in them. The light curves of KR Aur show large amplitude quasi-periodic pulsations with periods in the range 500–800s which can be ascribed to inhomogeneities in the accretion disc. The light curves of the X-ray emitting intermediate polar BG CMi show variable amplitude pulsations with 913s period. From the times of maxima of the pulsations obtained from observations over the period 1984–1989, the pulsation period is derived to be 0.010572966 ± 8 days and the spin-up rate to be (−5.7 ± 0.5) × 10−11 ss−1. The spin-up rate is consistent with the pulsating source being a white dwarf and not a neutron star.



Hide All
Bath, G. T., Evans, W. D. and Papaloizou, F., 1974, Mon. Not. R. Astr. Soc., 167, 7.
Livio, M., 1984, Astron. Astrophys., 141, L4.
McHardy, I. M., Pye, J. R, Fairall, A. P., Warner, B., Allen, S. and Cropper, M., 1984, Mon. Not. R. Astr. Soc., 210, 663.
Mufson, S. L., Wisniewski, W. Z. and McMillan, R. S., 1980, IAU Circ. No. 3471.
Penning, W. R., Schmidt, G. D. and Liebert, J., 1986, Astrophys. J., 301, 881.
Shafter, A. W. and Macry, J. D., 1987, Mon. Not. R. Astr. Soc., 228, 193.
Vaidya, J., Agrawal, P. C., Apparao, M. V. K., Manchanda, R. K., Rao, P. V. and Sarma, M.B.K., 1988, Astron. Astrophys. Suppl. Ser., 75, 43.
Wade, R.A., 1988, Astrophys. J., 335, 394.
Warner, B., 1983, Cataclysmic Variables and Related Objects, Livio, M. and Shaviv, G. (eds), Dortrecht Reidel.


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed