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Protoplanetary Disk Mass Distribution in Young Binaries
Jensen, Eric L. N.; Akeson, Rachel L.
We present millimeter-wave continuum images of four wide (separations 210-800 AU), young stellar binary systems in the Taurus-Auriga star-forming region. For all four sources, the resolution of our observations is sufficient to determine the millimeter emission from each of the components. In all four systems, the primary star's disk has stronger …
The history of the iron Kalpha line profile in the Piccinotti AGN ESO 198-G24
Guainazzi, M.
This paper presents ASCA (July 1997), XMM-Newton (December 2000) and BeppoSAX (January 2001) observations of the Piccinotti Seyfert 1 galaxy ESO 198-G24. The BeppoSAX 0.1-200 keV spectrum exhibits reprocessing features, probably produced by an X-ray illuminated, relativistic accretion disk subtending a solid angle la 2 pi . During the XMM-Newton o…
Reprocessing the Hipparcos Intermediate Astrometric Data of spectroscopic binaries. II. Systems with a giant component
Pourbaix, D.; Boffin, H. M. J.
By reanalyzing the Hipparcos Intermediate Astrometric Data of a large sample of spectroscopic binaries containing a giant, we obtain a sample of 29 systems fulfilling a carefully derived set of constraints and hence for which we can derive an accurate orbital solution. Of these, one is a double-lined spectroscopic binary and six were not listed in…
The first detection of Far-Infrared emission associated with an extended HI disk. The case of NGC 891
Tuffs, R. J.; Popescu, C. C.
Spiral galaxies in the local universe are commonly observed to be embedded in extended disks of neutral hydrogen - the so called ``extended HI disks''. Based on observations made using the ISOPHOT instrument on board the Infrared Space Observatory, we report the first detection of cold dust in the extended HI disk of a spiral galaxy. The detection…
Reconstructing a Cepheid Light Curve with Fourier Techniques. I. The Fourier Expansion and Interrelations
Tanvir, Nial R.; Ngeow, Chow-Choong; Kanbur, Shashi M. +2 more
Fourier decomposition is a well-established technique used in the study of stellar pulsation. However, the quality of reconstructed light curves using this method is reduced when the observed data have uneven phase coverage. We use simulated annealing techniques together with Fourier decomposition to improve the quality of the Fourier decompositio…
Unidentified infrared bands in the interstellar medium across the Galaxy
Lemke, D.; Lehtinen, K.; Mattila, K. +2 more
We present a set of 6-12 mu m ISOPHOT-S spectra of the general interstellar medium of the Milky Way. This part of the spectrum is dominated by a series of strong, wide emission features commonly called the Unidentified Infrared Bands. The sampled area covers the inner Milky Way from l = -60 degr to +60 degr with a ten-degree step in longitude and …
XMM-Newton Observation of the 5.25 Millisecond Transient Pulsar XTE J1807-294 in Outburst
Campana, S.; Belloni, T.; Israel, G. L. +2 more
We report on the results obtained for the millisecond transient X-ray pulsar XTE J1807-294 in a 40 minute orbital period system, based on an XMM-Newton target-of-opportunity observation carried out during 2003 March. The source was found at a luminosity level of about 2×1036 ergs s-1 in the 0.5-10 keV range (assuming a distan…
The Optical Counterpart of the Isolated Neutron Star RX J1605.3+3249
Kulkarni, S. R.; van Kerkwijk, M. H.; Kaplan, D. L.
We have detected the optical counterpart to the nearby isolated neutron star RX J1605.3+3249 using observations from the Space Telescope Imaging Spectrometer aboard the Hubble Space Telescope. The counterpart, with m50CCD=26.84+/-0.07 mag and very blue colors, lies close to the ROSAT HRI error circle and within the Chandra error circle.…
Prominence Motions Observed at High Cadences in Temperatures from 10 000 to 250 000 K
De Pontieu, B.; Kucera, T. A.; Tovar, M.
We report here for the first time observations of prominence velocities over a wide range of temperatures and with a high time cadence. Our study of ultraviolet movies of prominences reveals that multi-thermal features with speeds of 5-70 km s−1 perpendicular to the line of sight are common in the prominences which showed traceable moti…
Analysis of Stellar Occultation Data. II. Inversion, with Application to Pluto and Triton
Elliot, J. L.; Person, M. J.; Qu, S.
We present a method for obtaining atmospheric temperature, pressure, and number density profiles for small bodies through inversion of light curves recorded during stellar occultations. This method avoids the assumption that the atmospheric scale height is small compared with the radius of the body, and it includes the variation of gravitational a…