TANGENTIAL MOTIONS AND SPECTROSCOPY WITHIN NGC 6720, THE RING NEBULA

We have combined recent Hubble Space Telescope/WFPC2 images in the [O III] 5007 A and [N II] 6583 A lines with similar images made 9.557 years earlier to determine the motion of the Ring Nebula within the plane of the sky. Scaled ratio images argue for homologous expansion, that is, larger velocitie...

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Veröffentlicht in:	The Astronomical journal 2009-04, Vol.137 (4)
Hauptverfasser:	O'Dell, C. R., Henney, W. J., Sabbadin, F.
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ELECTRON TEMPERATURE EXPANSION GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE IONIZATION PLANETARY NEBULAE RADIAL VELOCITY SIGNAL-TO-NOISE RATIO SPECTROSCOPY TELESCOPES WHITE DWARF STARS
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