A Seminal Spectroscopic and Imagery Investigation of the Brightest Wolf-Rayet Shell Nebula: NGC 6888

Details A Seminal Spectroscopic and Imagery Investigation of the Brightest Wolf-Rayet Shell Nebula: NGC 6888 A Seminal Spectroscopic and Imagery Investigation of the Brightest Wolf-Rayet Shell Nebula: NGC 6888

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8568d&link_type=abstract

HST Proposal ID #8568

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Hst Proposal Id #8568 Ism And Circumstellar Matter

Scientific paper

We propose to obtain HST WFPC2 imagery and STIS UV-optical-NIR spectroscopy of several regions in the brightest Wolf-Rayet Shell Nebula {WRSN}, NGC 6888. The physical conditions in the wind-driven and/or stellar ejected plasma {temperature, density, ionization, and composition} of WRSN, which are dominated by strong stellar winds from hot massive stars in an advanced state of evolution, often involve emission from both shock-ionized and photoionized gas in close proximity. These new observations will comprise the first combined spectroscopy and imagery of a WRSN at a resolution sufficient {i.e., 10^15 cm} to separate and individually analyze these two emission regions. We also expect to obtain the first determination of the abundance of carbon - a key element in the He-C-N nucleosynthesis chain - in WRSN, of which several are known to be nitrogen- and helium-enriched by mass loss during its previous red supergiant phase. These observations will also be used to evaluate the contribution of stellar wind-driven shock emission as a source of temperature fluctuations, important for accurate abundance determinations within this and other types of nebulae, such as planetary nebulae and H ii regions.

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