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TwitterA&A 436, 967-975 (2005)
DOI: 10.1051/0004-6361:20052666
Absolute spectrophotometry of northern compact planetary nebulae
S. A. Wright1, 2, R .L. M. Corradi1 and M. Perinotto31 Isaac Newton Group of Telescopes, Ap. de Correos 321, 38700 Sta. Cruz de la Palma, Canary Islands, Spain
e-mail: rcorradi@ing.iac.es
2 UCLA, Department of Physics and Astronomy, Los Angeles, CA, 90095, USA
e-mail: saw@astro.ucla.edu
3 Dipartimento di Astronomia e Scienza dello Spazio, Universitá di Firenze, L.go E. Fermi 5, 50125 Firenze, Italy
e-mail: mariop@arcetri.astro.it
(Received 19 November 2002 / Accepted 14 March 2005 )
Abstract
We present medium-dispersion spectra and narrowband images
of six northern compact planetary nebulae (PNe):
BoBn 1
,
DdDm 1
,
IC 5117
,
M 1-5
,
M 1-71
, and
NGC 6833
.
From broad-slit spectra, total absolute fluxes
and equivalent widths were measured for all observable emission lines.
High signal-to-noise emission line fluxes of H
, H
, [OIII], [NII], and HeI
may serve as emission line flux standards for northern hemisphere
observers. From narrow-slit spectra, we derive systemic radial velocities.
For four PNe, available emission line fluxes were measured with
sufficient signal-to-noise to probe the physical properties of their
electron densities, temperatures, and chemical abundances.
BoBn 1
and
DdDm 1
, both type IV PNe, have an H flux over
three sigma away from previous measurements. We report the
first abundance measurements of
M 1-71
.
NGC 6833
measured radial velocity and galactic coordinates suggest that it is associated
with the outer arm or possibly the galactic halo, and its low abundance
(
![$\rm [O/H]=1.3\times 10^{-4}$](/articles/aa/abs/2005/24/aa2666-05/img3.gif){kind=small}
) may be indicative of low metallicity within that region.
Key words: ISM: planetary nebulae: general -- techniques: spectroscopic -- line: identification -- ISM: abundances
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