Two New Planetary Nebulae and an AGN in the
Galactic Plane

S. H. Beer and A. E. Vaughan, PASA, 16 (2), in press.
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Observations

Observations were carried out in 53 of the candidate fields in January 1998 on the 74

$^{\prime\prime}$ Telescope at Mount Stromlo Observatory. The Boller & Chivens Cassegrain Spectrograph was used, with the 300 lines/mm grating blazed at 5000 Å. Approximate flux calibration was made using observations of a single source, HR 3454, as precise flux measurements were not needed. Finder charts were constructed from Digitized Sky Survey (DSS) images obtained from the SkyView Virtual Observatory. It was necessary to take spectra of several objects in each field, most of which turned out to be ordinary stars.

Spectra were taken of 112 objects from 3800 to 5300 Å. The spectra were reduced using IRAF, and nine objects with PN-like emission-line spectra were found. However six of these were located close to known HII regions, and had spectra similar to these HII regions. Of the remaining three, two are classified here as PN and one as a Seyfert 2 galaxy. Coordinates of the three objects are shown in Table 1, along with other catalogue listings for the objects from the SIMBAD database. Observed spectral line strengths and other properties of the objects are given in Table 2. Finder charts for the objects are shown in Figures 1-3. The two PN are the objects IRAS 08418-4847 and IRAS 14132-5839, and the galaxy is IRAS 07245-3548. IRAS 08418-4847 is present in the `pospn' file of the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae, and is given the object type ``PN?'' in the SIMBAD database.


Table 1: Coordinates and other catalogue designations for the three objects.
IRAS $\alpha$ J2000      $\delta$ J2000      l      b      Other designations

07245-3548

07 26 26.3 -35 54 24

248.76

-9.03 PMN J0726-3554
08418-4847 08 43 29.1 -48 54 50 267.37 -3.95 PMN J0843-4854a, PK 267-03,
Wray 16-28, PN Sa 3-7
14132-5839 14 16 51.8 -58 53 11 313.78 +2.17 PMN J1416-5853



Table 2: Properties of the objects: Observed optical spectral line fluxes, IRAS and PMN fluxes, ratio of [OIII] lines to H$_\beta $, extinction coefficient C, excitation class p, radial velocity vrad, and observed angular diameters.
Flux or Nebular Property 07245-3548 08418-4847 14132-5839

3727 Å [OII] (10-14 erg cm-2 s-1)

8.2 - -
4861 Å H$_\beta $ (10-14 erg cm-2 s-1) 1.4 2.8 1.0
4959 Å [OIII] (10-14 erg cm-2 s-1) 7.5 14 3.2
5007 Å [OIII] (10-14 erg cm-2 s-1) 22 46 9.8

IRAS 12$\mu$m (Jy)

 0.3 0.37 0.3
IRAS 25$\mu$m (Jy) 0.87 3.6 3.4
IRAS 60$\mu$m (Jy) 1.54 4.1 1.9
IRAS 100$\mu$m (Jy) 3.03 24 39
PMN 5 GHz (mJy) 109$\pm$13 96$\pm$10 34$\pm$8

$\frac{F(4959+5007)}{F({\rm H}_\beta)}$

21 21 13
C - 3.04 2.98
p - $\ge$ 4 3
vrad (km s-1) 8730$\pm$66 132$\pm$25 -144$\pm$15
diameter (

$^{\prime\prime}$)

 $\le$ 1.5 $\le$ 2.8 $\le$ 2.5


Figure 1: Finder chart for IRAS 07245-3548

\scalebox{0.6}{\includegraphics{Finderbwn25.ps}}

Figure 2: Finder chart for IRAS 08418-4847

\scalebox{0.6}{\includegraphics{Finderbwn38.ps}}

Figure 3: Finder chart for IRAS 14132-5839

\scalebox{0.6}{\includegraphics{Finderbwn96.ps}}

Next Section: The Planetary Nebulae
Title/Abstract Page: Two New Planetary Nebulae
Previous Section: Introduction
Contents Page: Volume 16, Number 2

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