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The long period Intermediate Polar RX J1548-4528

Abstract : Phase-resolved optical spectroscopy of the recently identified Intermediate Polar (IP) RX J1548-4528 (Haberl et al. 2002) reveals radial velocity variability of emission lines at the 693 s X-ray and photometric period, confirming the identification of the white dwarf (WD) spin period as well as at a 9.87 hr period, which we identify as the orbital period. RX J1548-4528 is then the fourth longest period IP known so far. The optical spectrum is peculiar with broad absorptions around Balmer emission lines resembling those observed in V 709 Cas (Bonnet-Bidaud et al. 2001). Their origin, the WD or disc, remains unclear. An evolved G9-K3 secondary star is detected in the red spectra.
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Submitted on : Tuesday, November 6, 2007 - 11:53:23 AM
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D. de Martino, M. Mouchet, J. M. Bonnet-Bidaud, F. Haberl, B. T. Gänsicke. The long period Intermediate Polar RX J1548-4528. The Astrophysics of Cataclysmic Variables and Related Objects, Jul 2004, Strasbourg, France. pp.401. ⟨in2p3-00185508⟩



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