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Properties of the ζ Aur-Type Binary System 22 Vul = QS Vul
Eaton, Joel A.; Shaw, Felecia G.
The 22 Vul system is important for studying the winds and chromospheres of cool evolved stars because the G4 I component is rotating rapidly and probably faster than synchronously. We discuss the system's physical properties in the context of a wide range of constraints on them and propose values that may be marginally better than previous ones (s…
The 2003 November 14 occultation by Titan of TYC 1343-1865-1. II. Analysis of light curves
Dhillon, V. S.; Irwin, P. G. J.; Taylor, F. W. +6 more
We observed a stellar occultation by Titan on 2003 November 14 from La Palma Observatory using ULTRACAM with three Sloan filters: u, g, and i (358, 487, and 758 nm, respectively). The occultation probed latitudes 2° S and 1° N during immersion and emersion, respectively. A prominent central flash was present in only the i filter, indicating wavele…
Constraining the Fundamental Parameters of the O-Type Binary CPD -41 7733
Gosset, E.; Rauw, G.; Sana, H.
Using a set of high-resolution spectra, we studied the physical and orbital properties of the O-type binary CPD -41 7733, located in the core of NGC 6231. We report the unambiguous detection of a secondary spectral signature and we derive the first SB2 orbital solution of the system. The period is 5.6815+/-0.0015 days, and the orbit has no signifi…
Solar Cycle Variation of Real CME Latitudes
Feng, Xueshang; Song, Wenbin; Hu, Yanqi
With the assumption of radial motion and uniform longitudinal distribution of coronal mass ejections (CMEs), we propose a method to eliminate projection effects from the apparent observed CME latitude distribution. This method has been applied to SOHO LASCO data from 1996 January to 2006 December. As a result, we find that the real CME latitude di…
Photometric study of the W UMa eclipsing binaries VW LMi and BX Dra
García-Melendo, E.; Gómez-Forrellad, J. M.; Sánchez-Bajo, F.
New ephemeris and the absolute parameters—masses, radii and luminosities—of the contact systems VW LMi and BX Dra have been obtained, by means of the analysis of the minima data available in the literature (for the determination of the ephemeris) and combining the previously published spectroscopic information and the results of the Wilson-Devinne…
New Ultraviolet Observations of AM CVn
Eracleous, Michael; Wade, Richard A.; Flohic, Hélène M. L. G.
We have obtained observations of the ultraviolet spectrum of AM CVn, an ultrashort-period helium cataclysmic variable, using the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope (HST). We obtained data in time-tag mode during two consecutive orbits of HST, covering 1600-3150 and 1140-1710 Å, respectively. The mean spectrum is…
A catalogue of candidate Red Clump stars in the Tycho-2.
Rybka, S. P.
Strands and braids in narrow planetary rings: a scattering system approach
Merlo, Olivier; Benet, Luis
We address the occurrence of narrow planetary rings and some of their structural properties, in particular when the rings are shepherded. We consider the problem as Hamiltonian scattering of a large number of non-interacting massless point particles in an effective potential. Using the existence of stable motion in scattering regions in this set u…
Super Star Cluster NGC 1705-1: A Local Analog to the Birth Site of Long-Duration γ-Ray Bursts
Chen, Hsiao-Wen; Bloom, Joshua S.; Prochaska, Jason X.
Recent observations suggest that global properties of the host galaxies for long-duration γ-ray bursts (GRBs) are particularly well suited for creating the massive star progenitors of these GRBs. Motivated by the hypothesis that massive young star clusters located in metal-poor, low-metallicity galaxies are a natural birth site for GRB progenitors…
Cygnus X-3 transition from the ultrasoft to the hard state
Gehrels, N.; von Kienlin, A.; De Cesare, G. +8 more
Aims:The nature of Cygnus X-3 is still not understood well. This binary system might host a black hole or a neutron star. Recent observations by INTEGRAL have shown that Cygnus X-3 was again in an extremely ultrasoft state. Here we present our analysis of the transition from the ultrasoft state, dominated by blackbody radiation at soft X-rays plus…