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Doppler Tomography of X-ray binaries
Boroson, B.; Vrtílek, S. D.; Quaintrell, H. +1 more
The Space Telescope Imaging Spectrograph (STIS) on HST provides the first ultraviolet data that are of sufficient spectral and temporal resolution to generate Doppler tomograms of X-ray binaries. We show both optical and ultraviolet maps constructed for the intermediate mass system Hercules X-1/HZ Her and the massive wind-fed system SMC X-1/SK160.…
The stellar content of the ring in NGC 660
Tikhonov, N. A.; Galazutdinova, O. A.; Hagen-Thorn, V. A. +2 more
We present the results of stellar photometry of the polar-ring galaxy
ISOCAM Observations of Globular Clusters in the Magellanic Clouds: The Data
Sauvage, M.; Onaka, T.; Tanabé, T. +2 more
Seventeen globular clusters in the Large and Small Magellanic Clouds were observed in the mid-infrared wavelength region with the ISOCAM instrument on board the Infrared Space Observatory (ISO). Observations were made using the broadband filters LW1, LW2, and LW10, corresponding to the effective wavelengths of 4.5, 6.7, and 12 µm, respective…
The corona of HD 199178 (V 1794 Cygni)
Gondoin, P.
HD 199178 (V 1794 Cygni), a chromospherically active late-type giant with a high X-ray luminosity, was observed by the XMM-Newton space observatory. Series of lines of highly ionized Fe and several Lyman lines of hydrogen-like ions are visible in the reflection grating spectra, most notably from O and Ne. Analysis results suggest a scenario where …
Newly Identified Star Clusters in NGC 6822, and the Age Distribution of Its Cluster System
Hodge, Paul; Krienke, Karl
From past ground-based imaging and our current Hubble Space Telescope images, we have identified 51 candidate open clusters in the dwarf irregular galaxy NGC 6822. Of these, 25 candidates are located on our HST images with standard wideband filters, 16 of which are securely identified as true clusters. Integrated photometry in B, V, and I for seve…
Computation of the Adiabatic Eigenmodes of Stars Using the Riccati Method
Takata, Masao; Löffler, Wolfgang
In stellar oscillation problems, it is often necessary to compute a large number of stellar eigenmodes with wildly varying radial orders and angular degrees. Conventionally the relaxation method is used for this purpose. This method is, however, fraught with several numerical issues, which make it cumbersome and tedious to write the corresponding …
Limits on I-Band Microvariability of the Galactic Bulge Mira Variables
McGowan, K. E.; Vestrand, W. T.; Woźniak, P. R.
We search for microvariability in a sample of 485 Mira variables with high-quality I-band light curves from the second-generation Optical Gravitational Lensing Experiment (OGLE-II). Rapid variations with amplitudes in the ~0.2-1.1 mag range lasting hours to days were discovered in Hipparcos data by de Laverny et al. Our search is primarily sensiti…
A Uniform Database of 2.2-16.5 µm Spectra from the ISOCAM CVF Spectrometer
Engelke, C. W.; Kraemer, Kathleen E.; Price, Stephan D.
We present all ISOCAM circular variable filter (CVF) spectra that cover more than one-third of the 2.2-16.5 µm spectral range of the instrument. The 364 spectra have been classified according to the classification system of Kraemer et al., as modified by Hodge et al. to account for the shorter wavelength range. Prior to classification, the s…
Martian northern polar cap: Layering and possible implications for radar sounding
Ilyushin, Yaroslaw A.
The propagation of electromagnetic waves in the northern polar ice sheet of Mars is considered. It is shown that the dispersion and attenuation of radio waves in the polar sheet are regulated by two groups of factors: the physical and chemical composition of the ice, and the geometrical parameters of the layered structure of polar sheet. Both anal…
Fundamental parameters and evolutionary state of the Herbig Ae star candidate HD 35929
Miroshnichenko, A. S.; Bjorkman, K. S.; Gray, R. O. +2 more
HD 35929 is a pre-main-sequence Herbig Ae star candidate that exhibits emission in the Hα line and a weak IR excess. Although its luminosity type was estimated as IV from low-resolution spectroscopy, the insignificant HIPPARCOS parallax (0.88±0.93 mas) contradicted the low luminosity. To resolve this discrepancy, we took 3 high-resolution optical …