Birth and early evolution of a planetary nebula
Article Abstract:
A star's final expulsion of gas as it forms a planetary nebula is poorly understood because the rapid formation of such nebulae is difficult to observe. A particular mystery is how a highly symmetrical nebula with collimated outflows can be produced by a spherical star. New optical observations of the Stingray nebula, which has become a planetary nebula only within the past few decades, shows that the collimated outflows are already apparent and reveals the nebular formation that focuses the outflows. A companion star has also been found, supporting the proposed link between asymmetrical planetary nebulae and binary central stars.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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The Guitar nebula: a bow shock from a slow-spin, high-velocity neutron star
Article Abstract:
A bow shock from a pulsar with a spindown luminosity more than 100 times smaller than other pulsars has been discovered. This prominent nebula is produced by a high-velocity pulsar, PSR 2224+65, through partially neutral gas. Moreover, the results suggest the likelihood of finding shocks around other pulsars and the use of nebulae to find high-velocity neutron star either not acting as pulsars or with their radiation beamed away from the Earth.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1993
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A non-terrestrial (super 16)O-rich isotopic composition for the protosolar nebula
Article Abstract:
A precise determination of the oxygen isotopic composition of the solar wind from particles implanted in the outer hundreds of nanometers of metallic grains in the lunar regolith is reported. Photochemical self-shielding of the CO gas irradiated by ultraviolet light (super 5-7) might be one of these key processes, because it depends on the abundance of the isotopes, rather than their masses.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2005
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