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Interstellar Absorption Lines in the Spectrum of the Starburst Galaxy NGC 1705
Sahu, M. S.
A Goddard High Resolution Spectrograph archival study of the interstellar absorption lines in the line of sight to the H i-rich, starburst dwarf galaxy NGC 1705 in the 1170 to 1740 Å range at ~120 km s^-1 resolution is presented. The absorption features arising because of photospheric lines are distinctly different from the interstellar lines: the…
UVBY photometry of 33 Tauri, HD 50169, and HR 7786 and an assessment of FCAPT comparison stars
Adelman, S. J.; Pi, C. -L. M.; Rayle, K. E.
Differential Strömgren uvby photometric observations from the Four College Automated Photoelectric Telescope are presented for the ellipsoidal variable 33 Tauri, and the magnetic Chemically Peculiar stars HD 50169 and HR 7786. We confirm that Hube's period of 2.975272 days for 33 Tau is correct. HD 50169 is a constant MCP star. HR 7786 is a large …
Physical properties of the quiescent prominence of 5June 1996, from Hα observations
Schmieder, B.; Roudier, Th.; Malherbe, J. -M. +2 more
The Multichannel Subtractive Double Pass spectrograph (MSDP) is designed to observe line profiles in a 2D field of view with a good spatial and temporal resolution. In order to deal with this unique opportunity, we introduce a new method for fitting the hydrogen Hα line formed in prominences and deriving various plasma parameters from line profile…
Radial evolution of ejecta characteristics and transient shocks: Ulysses in-ecliptic observations
Smith, E. J.; Neugebauer, M.; Phillips, J. L. +1 more
During its travel to Jupiter, Ulysses detected 25 ejecta and 32 transient forward shocks (TFS), and in the first 3 months after the Jupiter flyby Ulysses detected 9 ejecta and 5 TFS. Half of these ejecta (17) were associated with TFS. We identified the ejecta using bidirectional streaming of suprathermal electrons accompanied by other plasma cloud…
Absolute measurements of trigonometric parallaxes with astrometric satellites
Makarov, V. V.
The concept of absolute trigonometric parallax measurements is formulated in strict mathematical terms, in connection with the widely discussed plans for a future astrometric space mission. The parallaxes determined for a large number of stars spread all over the sky are absolute if the expected error (accidental or systematic) of the zero-point, …
HIP 60350: an extreme runaway star
Paunzen, E.; Maitzen, H. M.; Wagner, R. M. +2 more
Using Hipparcos proper motion as well as published and our own radial velocity data we identify HIP 60350 as fastest young B-type runaway star ejected 20 Myr ago or slightly less from the galactic plane, probably at a distance from the galactic center corresponding to spiral arm -II. Both the LSR velocity (417 kms(-1) ) and the mass of the star po…
Spectroscopic binary orbits from ultraviolet radial velocities. Paper 29: V Puppis (HD 65818)
Stickland, D. J.; Lloyd, C.; Pachoulakis, I. +1 more
ORFEUS-SPAS II Observations of the Ultraviolet-bright Star Barnard 29 in M13
Hurwitz, Mark; Dixon, W. Van Dyke
The UV-bright star Barnard 29 in the globular cluster M13 was observed with the Berkeley spectrometer on the ORFEUS-SPAS II mission in 1996 November-December. The resulting spectrum extends from the interstellar cutoff at 912 A to ~1200 A at a resolution of ~0.33 A. It shows numerous absorption features, both photospheric and interstellar, but no …
Shape of the heliospheric termination shock: Effects of latitude variations of solar wind dynamic pressure
Barnes, Aaron
We investigate the consequences of internal solar wind latitude variations on the heliospheric termination shock and the flow of the gas beyond the shock. We have developed a simple gasdynamic model, assuming the solar wind to be a steady, axially symmetric radial outflow of gas that passes through a termination shock and flows incompressibly beyo…
Tetrahedron Geometric Factors
Robert, Patrick; Glassmeier, Karl-Heinz; Daly, Patrick W. +3 more