| Description |
Carbon (and nitrogen) abundances, which can be used to constrainstellar evolution theory, are not well known in Galactic bulgeplanetary nebulae because the lines used are in the ultraviolet andare weak and difficult to measure accurately. We propose to measurethe C(+) abundance in a selection of low ionization PNe where it isthe dominant ion, by measuring the CII line at 157 microns. Thenitrogen line at 122 microns is used in conjunction with the line at6584 angstroms to accurately determine the electron temperature, whichnot only will make the nitrogen abundance more accurate, but willenable abundances to be determined for other ions measured in thevisual spectrum. |
| Keywords |
Herschel Space Observatory data, ESA Herschel mission dataset, far-infrared astronomy observations, submillimeter astronomy data, infrared space telescope observations, PACS photometer data, PACS spectrometer data, SPIRE photometer data, SPIRE Fourier transform spectrometer data, HIFI heterodyne spectroscopy data, far-infrared spectroscopy dataset, submillimeter spectral line observations, cold universe observations dataset, star formation infrared data, molecular cloud far-infrared observations, interstellar medium spectroscopy data, protoplanetary disk infrared observations, galaxy evolution far-infrared data, dust emission submillimeter observations, cosmic infrared background measurements, extragalactic infrared survey data, calibrated level 2 data products, FITS files astronomy, spectral cubes far-infrared, flux-calibrated maps, continuum photometry data, spectral energy distribution measurements, ESA Herschel Science Archive data |
