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Astrometric Solution of the Multiple System Xy Leo
Erdem, Ahmet; Bakis, Volkan; Budding, Edwin +2 more
An astrometric solution, together with time of minimum analysis, has been made for the multiple system XY Leonis (HIP 49136) to identify the properties of the remote companion to the eclipsing pair (AB). From this solution, we derive the inclination of the wide orbit (AB-cd) as 94.4∘± 0.2∘, angle of nodes as 247.3∘…
uvby FCAPT Photometry of the Magnetic Chemically Peculiar Stars 36 Aurigae, HR 2722, 13 Andromedae, and HD 220147
Adelman, Saul J.
Differential Strömgren uvby observations obtained with the Four College Automated Photoelectric Telescope (FCAPT) are presented for the magnetic chemically peculiar (mCP) stars 36 Aur, HR 2722, 13 And, and HD 220147. The new data help to better define the light curves. The period for 36 Aur was found to be 14.368 days, close to that for the previo…
A case study testing the cavity mode model of the magnetosphere
Sarafopoulos, D. V.
Based on a case study we test the cavity mode model of the magnetosphere, looking for eigenfrequencies via multi-satellite and multi-instrument measurements. Geotail and ACE provide information on the interplanetary medium that dictates the input parameters of the system; the four Cluster satellites monitor the magnetopause surface waves; the POLA…
A remarkable double helix in the V838 Mon nebula
Carlqvist, P.
In the beginning of 2002 the previously unnoted star V838 Mon had a powerful outburst. The star is surrounded by pre-existing, dusty clouds which are illuminated by the star in an expanding, parabolic layer. Spectacular images captured by the Hubble Space Telescope Advanced Camera for Surveys show that the clouds are to a great extent built up by …
HST/FOS time-resolved spectral mapping of IP Pegasi at the end of an outburst
Horne, K.; Saito, R. K.; Baptista, R.
We report an eclipse mapping analysis of time-resolved ultraviolet spectroscopy covering three eclipses of the dwarf nova IP Pegasi on the late decline of the 1993 May outburst. The eclipse maps of the first run show evidence of one spiral arm, suggesting that spiral structures may still be present in the accretion disc 9 days after the onset of t…
The merging cluster Abell 85 caught between meals by XMM-Newton
Durret, Florence; Lima Neto, Gastão B.; Forman, William
Our XMM-Newton observations of Abell 85 confirm the extended 4 Mpc filament first detected with ROSAT, which has an X-ray temperature of about ∼2 keV and is probably made of groups falling on to the cluster. A comparison of the temperature map with numerical simulations show that Abell 85 had intense merging activity in the past and is not fully r…
Determination of physical properties of a planetary surface by measuring the deceleration of a probe upon impact: Application to Titan
Lorenz, Ralph D.; McKay, Christopher P.; Seiff, Alvin +3 more
We report scale model laboratory experiments showing how an impact accelerometer on a planetary probe (based on the Huygens probe Phase A configuration) can provide significant information on the mechanical characteristics of the surface. In particular, solid and liquid surfaces can be discriminated. The density of liquids can in principle be dete…
Detection of thermal X-ray emission in the halo of the plerionic supernova remnant G21.5-0.9
Bocchino, F.
The detection of a soft thermal X-ray component in the spectrum of a bright knot in the halo of the plerion G21.5-0.9 is reported. Using a collisional ionization equilibrium model for an hot optically thin plasma, a temperature of kT 0.12-0.24 keV, a mass of 0.3-1.0 M⊙ and a density of 1.6-6 cm -3 is derived. The spectral ana…
Physical properties as indicators of liquid compositions: Derivation of the composition for Titan's surface liquids from the Huygens SSP measurements
Lorenz, R. D.; Hagermann, A.; Leese, M. R. +5 more
We present a method for inferring the relative molar abundance of constituents of a liquid mixture, in this case methane, ethane, nitrogen and argon, from a measurement of a set of physical properties of the mixture. This problem is of interest in the context of the Huygens Surface Science Package, SSP, equipped to measure several physical propert…
Effect of the latitudinal distribution of temperature at the coronal base on the interplanetary magnetic field configuration and the solar wind flow
Li, Xing; Habbal, Shadia Rifai; Li, Bo +1 more
Using a two-dimensional MHD model of the corona and solar wind, we investigate the role of the temperature distribution with latitude at the coronal base on the global magnetic field configuration and solar wind properties at 1 AU. The latitudinal distribution of temperature is aimed at modeling the transition in electron temperature at the Sun fr…