Six months of mass outflow and inclined rings in the ejecta of V1494 Aql     

S. P. S. Eyres  I. Heywood  T. J. O'Brien  R. J. Ivison  T. W. B. Muxlow  V. G. Elkin 《Monthly notices of the Royal Astronomical Society》2005,358(3):1019-1024

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Discovery of irradiation-induced variations in the light curve of the classical nova V2275 Cyg (N Cyg 2001 No. 2)     

&#;. Balman  A. Y&#;lmaz  A. Retter  T. Saygaç  H. Esenoglu 《Monthly notices of the Royal Astronomical Society》2005,356(2):773-777

We present charge-coupled device (CCD) photometry, light curve and time-series analysis of the classical nova V2275 Cyg (N Cyg 2001 No. 2). The source was observed for 14 nights in total in 2002 and 2003 using an R filter with the 1.5-m Russian–Turkish joint telescope (RTT150) at the TUBITAK National Observatory in Antalya, Turkey, as part of a large programme on the CCD photometry of cataclysmic variables. We report the detection of two distinct periodicities in the light curve of the nova: (a)   P ₁= 0.314 49(15) d [7.6 h]  , and (b)   P ₂= 0.017 079(17) d [24.6 min]  . The first period is evident in both 2002 and 2003 whereas the second period is only detected in the 2003 data set. We interpret the first period as the orbital period of the system and attribute the orbital variations to aspect changes of the secondary irradiated by the hot white dwarf (WD). We suggest that the nova was a supersoft X-ray source in 2002 and, perhaps, in 2003. The second period could be a quasi-periodic oscillation originating from the oscillation of the ionization front (due to a hot WD) below the inner Lagrange point or a beat frequency in the system as a result of the magnetic nature of the WD if steady accretion has already been re-established.  相似文献   

The simulation of non-linear stellar pulsations     

M. Grott  S. Chernigovski  W. Glatzel 《Monthly notices of the Royal Astronomical Society》2005,360(4):1532-1544

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The component masses of the cataclysmic variable V347 Puppis     

T. D. Thoroughgood  V. S. Dhillon  D. Steeghs  C. A. Watson  D. A. H. Buckley  S. P. Littlefair  D. A. Smith  M. Still †  K. J. van der Heyden  B. Warner 《Monthly notices of the Royal Astronomical Society》2005,357(3):881-894

We present time-resolved spectroscopy and photometry of the double-lined eclipsing cataclysmic variable V347 Pup (=LB 1800). There is evidence of irradiation on the inner hemisphere of the secondary star, which we correct for using a model to give a secondary-star radial velocity of   K _R= 198 ± 5 km s⁻¹  . The rotational velocity of the secondary star in V347 Pup is found to be   v sin  i = 131 ± 5 km s⁻¹  and the system inclination is   i = 840 ± 23  . From these parameters we obtain masses of   M ₁= 0.63 ± 0.04 M_⊙  for the white dwarf primary and   M ₂= 0.52 ± 0.06 M_⊙  for the M0.5V secondary star, giving a mass ratio of   q = 0.83 ± 0.05  . On the basis of the component masses, and the spectral type and radius of the secondary star in V347 Pup, we find tentative evidence for an evolved companion. V347 Pup shows many of the characteristics of the SW Sex stars, exhibiting single-peaked emission lines, high-velocity S-wave components and phase-offsets in the radial velocity curve. We find spiral arms in the accretion disc of V347 Pup and measure the disc radius to be close to the maximum allowed in a pressureless disc.  相似文献   

I-band time-series observations of five bright ultracool dwarfs     

Chris Koen 《Monthly notices of the Royal Astronomical Society》2004,354(2):378-386

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How many cosmological parameters?     

Andrew R. Liddle 《Monthly notices of the Royal Astronomical Society》2004,351(3):L49-L53

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XMM–Newton observations of the eclipsing polar EP Dra     

Gavin Ramsay  C. M. Bridge  Mark Cropper  K. O. Mason  F. A. Córdova  W. Priedhorsky 《Monthly notices of the Royal Astronomical Society》2004,354(3):773-778

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The non-radially pulsating primary of the cataclysmic variable GW Librae     

L. van Zyl  B. Warner  D. O'Donoghue  C. Hellier  P. Woudt  D. Sullivan  J. Pritchard  J. Kemp  J. Patterson  W. Welsh  J. Casares  T. Shahbaz  F. van der Hooft  S. Vennes 《Monthly notices of the Royal Astronomical Society》2004,350(1):307-316

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The Dushak-Erekdag survey of roAp stars     

Tatyana Dorokhova  Nikolay Dorokhov 《Journal of Astrophysics and Astronomy》2005,26(2-3):223-229

The search of roAp stars at Mt. Dushak-Erekdag Observatory was started in 1992 using the 0.8 m Odessa telescope equipped with a two-star high-speed photometer. We have observed more than a dozen stars so far and discovered HD 99563 as roAp star while BD+8087 is suspected to have rapid oscillations. Negative results of our observations for the search of rapid oscillations in four stars in NGC 752 are also discussed.  相似文献   

The light curve of the semiregular variable L₂ Puppis – II. Evidence for solar-like excitation of the oscillations     

T. R. Bedding  L. L. Kiss †  H. Kjeldsen  B. J. Brewer  Z. E. Dind  S. D. Kawaler  A. A. Zijlstra 《Monthly notices of the Royal Astronomical Society》2005,361(4):1375-1381

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