Rubin, RH;
Bhatt, NJ;
Dufour, RJ;
Buckalew, BA;
Barlow, MJ;
Liu, XW;
Storey, PJ;
... Martin, PG; + view all
(2003)
Temperature variations from HST imagery and spectroscopy of NGC 7009.
In: Kwok, S and Dopita, M and Sutherland, R, (eds.)
Proceedings of the International Astronomical Union.
(pp. pp. 361-362).
Cambridge University Press
Preview |
Text
0204276v1.pdf - Accepted Version Download (277kB) | Preview |
Abstract
We obtained new HST/STIS long-slit spectra and WFPC2 imagery of the planetary nebula NGC 7009 in order to obtain high spatial resolution of the intrinsic flux ratio [O III] 4364/5008, which is a well-known diagnostic for electron temperature (Te). Our primary purpose was to quantify Te variations across the nebula. We address whether the observational data support the possibility that the [fractional] mean-square Te variation (t2) (Peimbert 1967) in NGC 7009 may be as large as ~0.1. Such large values are required to reconcile the “abundance dichotomy” by Te variations alone. The abundance dichotomy (discussed by Liu at greater length elsewhere in this volume) refers to the significantly higher heavy element abundances derived from optical recombination lines (e.g., a factor of ~5 for NGC 7009, Liu et al. 1995) compared with the corresponding values deduced from collisionally-excited lines.
| Type: | Proceedings paper |
|---|---|
| Title: | Temperature variations from HST imagery and spectroscopy of NGC 7009 |
| Event: | 209th Symposium of the International-Astronomical-Union |
| Location: | CANBERRA, AUSTRALIA |
| Dates: | 19 November 2001 - 23 November 2001 |
| ISBN: | 1-58381-148-6 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1017/S0074180900209017 |
| Publisher version: | https://doi.org/10.1017/S0074180900209017 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. 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 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/10096010 |
Archive Staff Only
 |
View Item |
