COHEN, M;
BARLOW, MJ;
(1980)
Infrared photometry of southern planetary nebulae and emission-line objects.
Astrophysical Journal
, 238
pp. 585-595.
10.1086/158015.
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Abstract
Ten-micron photometry is presented of 23 planetary nebulae, seven very low excitation (VLE) nebulae, and 11 emission-line objects, of which more than half were also detected at 20 microns. The 10-micron behaviors of the various classes of objects are compared, and it is shown that planetary nebulae can easily be distinguished from VLE nebulae by virtue of the silicate emission displayed by the latter. A uniform sample of planetary nebulae for statistical analysis is created by combining the present sample with an earlier northern hemisphere survey. It is shown that L alpha photons are the dominant grain heating mechanism for nebular electron densities less than approximately 15,000/cu cm, whereas above this density direct dust absorption of stellar continuum photons dominates.
| Type: | Article |
|---|---|
| Title: | Infrared photometry of southern planetary nebulae and emission-line objects |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1086/158015 |
| Publisher version: | https://doi.org/10.1086/158015 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10095250 |
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