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Interacting Binaries No Interacting Binaries No. 6, March, 2001 An Electronic Newsletter Editors: Boris T. Gansic¨ ke, Jens Kube Universitats-Ster¨ nwarte, Geismar Landstraße 11, D-37083 Gottingen¨ [email protected] http://www.uni-sw.gwdg.de/ibnews Contents 1 Editorial 2 – IBNews #06 Gansic¨ ke & Kube . 2 2 Abstracts of refereed papers 3 – Z Cam stars: A particular response to a general phenomenon Buat-Menar´ d et al. 3 – Repetitive Rebrightening of EG Cancri: Evidence for Viscosity Decay in Quiescent Disk? Osaki et al. 3 – The standstill luminosity in Z Cam systems Stehle et al. 4 – On the nature of superoutbursts in dwarf novae Truss et al. 4 – On Echo Outbursts and ER UMa Supercycles in SU UMa-type Cataclysmic Variables Hellier . 4 – NLTE accretion disc models for the AM Canum Venaticorum systems Nasser et al. 5 – A ROSAT WFC observation of SW UMa: the EUV behaviour of dwarf novae in superoutburst explai- ned Burleigh et al. 5 – Phase-resolved HST/STIS spectroscopy of the exposed white dwarf in the high-field polar AR UMa Gansic¨ ke et al. 6 – Optical Photometry of the Double-lined Cataclysmic Variable Phoenix 1 Hoard et al. 6 – Hubble Space Telescope spectroscopy of the dwarf nova RX Andromeda I: The underlying white dwarf Sion et al. 7 – X-ray and Optical Spectra of the Unusual Cataclysmic Variables LS Peg and T Leo Szkody et al. 7 – Spectroscopic Discovery of Brown Dwarf-like Secondary Stars in the Cataclysmic Variables LL Andromedae and EF Eridani Howell & Ciardi . 8 – The early X-ray emission from V382 Velorum (=Nova Vel 1999): An internal shock model Mukai & Ishida . 8 – Superhumps in Cataclysmic Binaries. XIX. DV Ursae Majoris Patterson et al. 9 – Superhumps in Cataclysmic Binaries. XX. V751 Cygni Patterson et al. 9 – Superhumps in Cataclysmic Binaries. XVIII. IY Ursae Majoris Patterson et al. 10 – Accretion-Disk Precession and Substellar Secondaries in Cataclysmic Variables Patterson . 11 – Optical studies of the X-ray transient XTE J2123-058 - II. Phase-resolved spectroscopy Hynes et al. 11 – IR spectra of the microquasar GRS 1915+105 during a low state Harlaftis et al. 12 – A ‘superoutburst’ in XTE J1118+480 Kuulkers . 12 – Black hole X-ray transients: mass accumulation in the disk - constraints for the viscosity Meyer- Hofmeister & Meyer . 13 – Applications of Indirect Imaging techniques in X-ray binaries Harlaftis . 13 – The “Twin Jet” Planetary Nebula M2 9 Livio & Soker . 13 – Properties and nature of Be stars XX. Binary nature and orbital elements of γ Cas Harmanec et al. 14 1 EDITORIAL 2 – On the duration of the subsonic propeller state of neutron stars in wind-fed mass-exchange close binary systems Ikhsanov . 14 – Tidal evolution of eccentric orbits in massive binary systems II. Coupled resonance locking for two rotating main sequence stars Witte & Savonije . 15 – Population synthesis for double white dwarfs I. Close detached systems Nelemans et al. 15 – Population synthesis for double white dwarfs II. Semi-detached systems: AM CVn stars Nelemans et al. 16 3 Other abstracts 17 – Outburst activity in magnetic cataclysmic variables BY Cam and QQ Vul Halevin et al. 17 – A self-regulating braking mechanism in black hole X-ray binaries Meyer & Meyer-Hofmeister . 17 4 Miscellaneous announcements 18 – OpenGL code to draw pictures and animations of cataclysmic variables Beardmore . 18 – Free copies of 2 Proceedings Volumes Greiner . 18 – Cataclysmic Variable Stars: How and why they vary Hellier . 18 – Book review: Cataclysmic Variable Stars: How and why they vary Gansic¨ ke . 19 5 Conference announcements 19 – The International Conference on Variable Star Research M. Zejda & Z. Mikulasek . 19 – Stellar atmospheric modeling Werner . 20 – The physics of cataclysmic variables and related objects, August 5–10, 2001, Georg-August- Universitat¨ Gottingen,¨ Germany . 21 6 Jobs and positions 21 – Research Associate, Univ. of Leicester – Available from 1 October 2001 for 2 years . 21 1 Editorial IBNews #06 B. T. Gansic¨ ke & J. Kube Universitats-Sternw¨ arte Gottingen,¨ Geismar Landstraße 11, D-37083 Gottingen,¨ Germany Dear IB friends, we celebrate with this issue the first anniversary of the Interacting Binary Newsletter, so it’s time for us to thank all of you for the steady inflow of contributions. The next issue of IBnews is planned for May 31 and we will remind you a week ahead with a call for abstracts. Happy reading, Boris Gansick¨ e & Jens Kube Download/Website: http://www.uni-sw.gwdg.de/ibnews Contact: [email protected] 2 ABSTRACTS OF REFEREED PAPERS 3 2 Abstracts of refereed papers Z Cam stars: A particular response to a general phenomenon V. Buat-Menar´ d 1, J.-M. Hameury 1 and J.-P. Lasota 1 1 UMR 7550 du CNRS, Observatoire de Strasbourg, 11 rue de l’Universite,´ F-67000 Strasbourg, France 2 Institut d’Astrophysique de Paris, 98bis Boulevard Arago, 75014 Paris, France Astronomy & Astrophysics, in press (astro-ph/0101329) We show that the disc instability model can reproduce all the observed properties of Z Cam stars if the energy equation includes heating of the outer disc by the mass-transfer stream impact and by tidal torques, and if the mass-transfer rate from the secondary varies by about 30% around the value critical for stability. In particular the magnitude difference between outburst maxima and standstills corresponds to observations, all outbursts are of the inside-out type and can be divided into two classes: long (wide) and short (narrow) outbursts, as observed. Mass transfer rate fluctuations should occur in other dwarf novae but one can exclude variations similar to those observed in magnetic systems (AM Her’s and some DQ Her’s) and some nova-like systems (VY Scl’s), in which M˙ become very small during low states; these would produce mini-outbursts which, although detectable, have never been observed. Download/Website: http://xxx.lpthe.jussieu.fr/ps/astro-ph/0101329 Contact: [email protected] Repetitive Rebrightening of EG Cancri: Evidence for Viscosity Decay in Quiescent Disk? Yoji Osaki1, Friedrich Meyer2, Emmi Meyer-Hofmeister2 1 Faculty of Education, Nagasaki University, Nagasaki 852-8521, Japan 2 Max-Planck-Institut fur¨ Astrophysik, Karl-Schwarzschild Str. 1, D-85740 Garching, Germany Astronomy & Astrophysics, in press(astro-ph/0102335) A WZ Sge-type dwarf nova, EG Cancri, exhibited six consecutive mini-outbursts with a mean interval of about seven days after the end of the main outburst in 1996/1997. The most unusual was that the star entered abruptly into a deep faint minimum after such frantic activities. We propose that this peculiar phenomenon may be understood in terms of viscosity decay in the cold disk in which the disk viscosity is produced by MHD turbulence due to the magneto-rotational instability (the Balbus-Hawley instability). In this picture, the viscosity dies down exponentially with time when the disk becomes cold because the magnetic fields decay due to finite conductivity in the cold disk, a mechanism suggested by Gammie and Menou (1998), but it is refreshed to a high value every time when a mini- outburst occurs (i.e., the disk becomes hot again). It is argued that a sudden cessation of repetitive mini-outbursts may be brought about by a very small reduction in viscosity or a small increase in its decay rate, which may in turn be produced most likely by stochastic fluctuations of magnetic fields. Numerical simulations based on a simple model are presented which can reproduce observed light curve of EG Cancri very well. Some discussions are made for possible causes why the reflare after the main outburst occurs mostly in the WZ Sge-type stars. Contact: [email protected] 2 ABSTRACTS OF REFEREED PAPERS 4 The standstill luminosity in Z Cam systems R. Stehle, A.R. King, C. Rudge Theoretical Astrophysics Group, Department of Physics & Astronomy, University of Leicester, Leicester LE1 7RH, U.K. Monthly Notices of the Royal Astronomical Society, in press (astro-ph/0012379) We consider accretion discs in close binary systems. We show that heating of a disc at the impact point of the accretion stream contributes significantly to the local energy budget at its outer edge. As a result the thermal balance relation between local accretion rate and surface density (the ‘S–curve’) changes; the critical mass transfer rate above which no dwarf nova outbursts occur can be up to 40% smaller than without impact heating. Standstills in Z Cam systems thus occur at smaller mass transfer rates than otherwise expected, and are rather fainter than the peak luminosity during the dwarf nova phase as a result. Contact: [email protected] On the nature of superoutbursts in dwarf novae M.R. Truss, J.R. Murray, G.A. Wynn Astronomy Group, University of Leicester, University Road, Leicester, LE1 7RH Monthly Notices of the Royal Astronomical Society Letters, in press We present the first detailed hydrodynamic simulation of a superoutburst to incorporate the full tidal potential of a binary system. A two-dimensional smoothed particle hydrodynamics code is used to simulate a superoutburst in a binary with the parameters of the SU UMa system Z Chamaeleontis. The simulated light curves shows all the features observed in such systems. Analysis of the mass flux through the disc and the growth rate of the superhumps and disc eccentricity show that the superoutburst-superhump phenomenon is a direct result of tidal instability. No enhanced mass transfer from the secondary is required to initiate or sustain these phenomena. Comparisons of superoutbursts with normal outbursts are made and we show that the model can be reconciled with the behavior of U Geminorum type dwarf novae, which show no superoutbursts. Download/Website: http://www.star.le.ac.uk/ ¡ mtr Contact: [email protected] On Echo Outbursts and ER UMa Supercycles in SU UMa-type Cataclysmic Variables Coel Hellier Department of Physics, Keele University, Staffordshire ST5 5BG, U.K.
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