Superhumps in cataclysmic binaries. XXIII. V442 ophiuchi and RX J1643.7+3402

Joseph Patterson, William H. Fenton, John R. Thorstensen, David A. Harvey, David R. Skillman, Robert E. Fried, Berto Monard, Darragh O'Donoghue, Edward C Beshore, Brian Martin, Panos Niarchos, Tonny Vanmunster, Jerry Foote, Greg Bolt, Robert Rea, Lewis M. Cook, Neil Butterworth, Matt Wood

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We report the results of long observing campaigns on two novalike variables: V442 Ophiuchi and RX J1643.7+3402. These stars have high-excitation spectra, complex line profiles signifying mass loss at particular orbital phases, and similar orbital periods (respectively, 0.12433 and 0.12056 days). They are well-credentialed members of the SW Sex class of cataclysmic variables. Their light curves are also quite complex. V442 Oph shows periodic signals with periods of 0.12090(8) and 4.37(15) days, and RX J1643.7+3402 shows similar signals at 0.11696(8) and 4.05(12) days. We interpret these short and long periods, respectively, as a "negative superhump" and the wobble period of the accretion disk. The superhump could then possibly arise from the heating of the secondary (and structures fixed in the orbital frame) by inner-disk radiation, which reaches the secondary relatively unimpeded since the disk is not coplanar. At higher frequencies, both stars show another type of variability: quasi-periodic oscillations with a period near 1000 s. Underlying these strong signals of low stability may be weak signals of higher stability. Similar quasi-periodic oscillations, and negative superhumps, are quite common features in SW Sex stars. Both can in principle be explained by ascribing strong magnetism to the white dwarf member of the binary; and we suggest that SW Sex stars are borderline AM Herculis binaries, usually drowned by a high accretion rate. This would provide an ancestor channel for AM Hers, whose origin is still mysterious.

Original languageEnglish (US)
Pages (from-to)1364-1381
Number of pages18
JournalPublications of the Astronomical Society of the Pacific
Volume114
Issue number802
DOIs
StatePublished - 2003
Externally publishedYes

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stars
orbitals
oscillation
fixed structure
accretion
oscillations
cataclysmic variables
accretion disks
ancestry
light curve
heating
radiation
profiles
excitation
loss
magnetism
rate

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Patterson, J., Fenton, W. H., Thorstensen, J. R., Harvey, D. A., Skillman, D. R., Fried, R. E., ... Wood, M. (2003). Superhumps in cataclysmic binaries. XXIII. V442 ophiuchi and RX J1643.7+3402. Publications of the Astronomical Society of the Pacific, 114(802), 1364-1381. https://doi.org/10.1086/344587

Superhumps in cataclysmic binaries. XXIII. V442 ophiuchi and RX J1643.7+3402. / Patterson, Joseph; Fenton, William H.; Thorstensen, John R.; Harvey, David A.; Skillman, David R.; Fried, Robert E.; Monard, Berto; O'Donoghue, Darragh; Beshore, Edward C; Martin, Brian; Niarchos, Panos; Vanmunster, Tonny; Foote, Jerry; Bolt, Greg; Rea, Robert; Cook, Lewis M.; Butterworth, Neil; Wood, Matt.

In: Publications of the Astronomical Society of the Pacific, Vol. 114, No. 802, 2003, p. 1364-1381.

Research output: Contribution to journalArticle

Patterson, J, Fenton, WH, Thorstensen, JR, Harvey, DA, Skillman, DR, Fried, RE, Monard, B, O'Donoghue, D, Beshore, EC, Martin, B, Niarchos, P, Vanmunster, T, Foote, J, Bolt, G, Rea, R, Cook, LM, Butterworth, N & Wood, M 2003, 'Superhumps in cataclysmic binaries. XXIII. V442 ophiuchi and RX J1643.7+3402', Publications of the Astronomical Society of the Pacific, vol. 114, no. 802, pp. 1364-1381. https://doi.org/10.1086/344587
Patterson J, Fenton WH, Thorstensen JR, Harvey DA, Skillman DR, Fried RE et al. Superhumps in cataclysmic binaries. XXIII. V442 ophiuchi and RX J1643.7+3402. Publications of the Astronomical Society of the Pacific. 2003;114(802):1364-1381. https://doi.org/10.1086/344587
Patterson, Joseph ; Fenton, William H. ; Thorstensen, John R. ; Harvey, David A. ; Skillman, David R. ; Fried, Robert E. ; Monard, Berto ; O'Donoghue, Darragh ; Beshore, Edward C ; Martin, Brian ; Niarchos, Panos ; Vanmunster, Tonny ; Foote, Jerry ; Bolt, Greg ; Rea, Robert ; Cook, Lewis M. ; Butterworth, Neil ; Wood, Matt. / Superhumps in cataclysmic binaries. XXIII. V442 ophiuchi and RX J1643.7+3402. In: Publications of the Astronomical Society of the Pacific. 2003 ; Vol. 114, No. 802. pp. 1364-1381.
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AU - Harvey, David A.

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AU - Martin, Brian

AU - Niarchos, Panos

AU - Vanmunster, Tonny

AU - Foote, Jerry

AU - Bolt, Greg

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