scholarly journals UV and Optical Abundances for a Sample of Southern Galactic Planetary Nebulae

1993 ◽  
Vol 155 ◽  
pp. 571-571
Author(s):  
Robin L. Kingsburgh ◽  
M.J. Barlow
Keyword(s):  
Southern Hemisphere ◽  
Planetary Nebulae ◽  
Optical Spectra ◽  
Uv Spectra ◽  
Low Resolution ◽  
Low Dispersion

We present abundances for a sample of 57 southern hemisphere galactic planetary nebulae (PN). Optical spectra covering the 3100–7400 Å range were obtained at the AAT. Low resolution UV spectra obtained with the IUE satellite were available for half of these objects and were accessed via the IUE Uniform Low–Dispersion Archive. Additionally, new low resolution IUE SWP observations of Fg 1, M 3-1 and M 3-3 were obtained.

scholarly journals Two New Planetary Nebulae and an AGN in the Galactic Plane

1999 ◽  
Vol 16 (2) ◽  
pp. 134-138 ◽  
Author(s):  
S. H. Beer ◽  
A. E. Vaughan
Keyword(s):  
Radio Emission ◽  
Planetary Nebula ◽  
Galactic Plane ◽  
Angular Size ◽  
Planetary Nebulae ◽  
Optical Spectra ◽  
Radio Flux ◽  
Low Resolution ◽  
5 Ghz

AbstractA search for planetary nebulae was carried out using candidates selected by their infrared colours and 5 GHz radio emission. One new planetary nebula was identified on the basis of its small angular size, strong [O iii] emission and infrared colours. Another object, known as the possible planetary nebula Wray 16–28, is similarly identified as a planetary nebula. An undiscovered AGN was also found, and is classed as a Seyfert 2 galaxy on the basis of its strong O iii emission, linewidths of ∼500 km s−1, and 5 GHz radio flux. Low-resolution optical spectra are presented and distance estimates discussed.

scholarly journals Nebular and auroral emission lines of [Cl III] in the optical spectra of planetary nebulae

2000 ◽  
Vol 97 (9) ◽  
pp. 4551-4555 ◽  
Author(s):  
F. P. Keenan ◽  
L. H. Aller ◽  
C. A. Ramsbottom ◽  
K. L. Bell ◽  
F. L. Crawford ◽  
...  
Keyword(s):  
Planetary Nebulae ◽  
Optical Spectra ◽  
Emission Lines ◽  
Auroral Emission

High and Low Resolution Spectra of Selected Planetary Nebulae

1989 ◽  
pp. 191-191
Author(s):  
S. Cristiani ◽  
F. Sabbadin ◽  
S. Ortolani
Keyword(s):  
Planetary Nebulae ◽  
Low Resolution

scholarly journals Chemical Abundances in Galactic Bulge Pn

1993 ◽  
Vol 155 ◽  
pp. 581-581 ◽  
Author(s):  
N.A. Walton ◽  
M.J. Barlow ◽  
R.E.S. Clegg
Keyword(s):  
Galactic Disk ◽  
Planetary Nebulae ◽  
Solar Neighbourhood ◽  
Galactic Bulge ◽  
Low Resolution ◽  
Chemical Abundances ◽  
The Mean ◽  
Optical Spectrophotometry ◽  
High Metallicity

We present abundance determinations, in particular of carbon, and C/O ratios, for 11 Galactic bulge planetary nebulae (PN) based on our low resolution UV data from IUE observations and optical spectrophotometry from the Anglo-Australian Telescope. We compare the observed abundances with those predicted by dredge-up theory for the high metallicity Galactic bulge. The sample abundances are also contrasted with the abundances found for PN in the Galactic disk. The mean C/O ratio for the bulge PN is significantly lower than that found for Galactic disk PN. Further, we present an abundance analysis of the very metal-poor bulge PN M2-29. From an analysis of the differential extinction found from the observed ratios of the He ii 1640,4686Å lines, we find that the ultraviolet reddening law towards the bulge is steeper than in the solar neighbourhood.

scholarly journals UV Monochromatic Imaging of the Protoplanetary Nebula Hen 3-1475 Using HST STIS

Galaxies ◽  
2018 ◽  
Vol 6 (4) ◽  
pp. 141
Author(s):  
Xuan Fang ◽  
Martín Guerrero ◽  
Ana Castro ◽  
Jesús Toalá ◽  
Bruce Balick ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Critical Role ◽  
Planetary Nebulae ◽  
Emission Lines ◽  
Comparison Analysis ◽  
Space Telescope ◽  
Monochromatic Imaging ◽  
Protoplanetary Nebula ◽  
Low Dispersion ◽  
Negative Gradient

Collimated outflows and jets play a critical role in shaping planetary nebulae (PNe), especially in the brief transition from a spherical AGB envelope to an aspherical PN, which is called the protoplanetary nebula (pPN) phase. We present UV observations of Hen 3-1475, a bipolar pPN with fast, highly collimated jets, obtained with STIS on board the Hubble Space Telescope (HST). The deep, low-dispersion spectroscopy enabled monochromatic imaging of Hen 3-1475 in different UV nebular emission lines; this is the first of such attempt ever conducted for a pPN. The northwest inner knot (NW1) is resolved into four components in Mg ii λ 2800. Through comparison analysis with the HST optical narrowband images obtained 6 yr earlier, we found that these components of NW1 hardly move, despite of a negative gradient of high radial velocities, from −1550 km s - 1 on the innermost component to ∼−300 km s - 1 on the outermost. These NW1 knot components might thus be quasi-stationary shocks near the tip of the conical outflow of Hen 3-1475.

scholarly journals The Properties of Population I WO Stars

1991 ◽  
Vol 143 ◽  
pp. 101-101 ◽  
Author(s):  
R. L. Kingsburgh ◽  
M. J. Barlow
Keyword(s):  
Optical Spectra ◽  
Low Resolution ◽  
Relative Abundances

High and low resolution UV and optical spectra of the four Population I WO stars originally classified by Barlow and Hummer (1982), Sanduleak 1, 2, 4 and 5, have been analyzed. Reddenings, terminal velocities and the relative abundances of He2+, C4+ and O6+ have been determined. The results are presented in Table 1.

scholarly journals Ultra-Violet Spectrophotometry of Some Hotter Central Stars

1983 ◽  
Vol 103 ◽  
pp. 536-537 ◽  
Author(s):  
R.E.S. Clegg ◽  
M.J. Seaton
Keyword(s):  
Data Center ◽  
Ultra Violet ◽  
Planetary Nebulae ◽  
Optical Observations ◽  
Low Resolution ◽  
Hot Stars ◽  
Central Stars

A spectrophotometric survey has been made for about 20 central stars of planetary nebulae, with emphasis mainly on hot stars. We use low-resolution IUE spectra, observed by ourselves or obtained from Data Center, together with, in some cases, results from optical observations. Data have been extracted and merged, regions of saturation eliminated, ITF errors corrected and nebular continua subtracted. Careful assessments have been made of reddening constants, and of data used to calculate Zanstra temperatures.

scholarly journals A Survey of Planetary Nebulae in the SMC and M31

1989 ◽  
Vol 131 ◽  
pp. 351-351
Author(s):  
N. Meyssonnier ◽  
M. Azzopardi ◽  
J. Lequeux ◽  
R. Gathier
Keyword(s):  
Emission Line ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Objective Prism ◽  
Low Dispersion ◽  
Selection Of ◽  
General Method

Our general method for finding planetary nebulae (PN) is to make wide field objective-prism or objective-grating low-dispersion spectra on photographic plates, PN stand up amongst other emission-line objects either as Hα + [N II] 6548-6583 A emitters or as [O III] 50007 A emitters with faint or no continuum, higher-resolution spectroscopy is used for confirming a selection of candidates.

scholarly journals OPTICAL SPECTRA OF CANDIDATE SOUTHERN HEMISPHERE INTERNATIONAL CELESTIAL REFERENCE FRAME (ICRF) RADIO SOURCES

2011 ◽  
Vol 142 (5) ◽  
pp. 165 ◽  
Author(s):  
O. Titov ◽  
D. L. Jauncey ◽  
H. M. Johnston ◽  
R. W. Hunstead ◽  
L. Christensen
Keyword(s):  
Reference Frame ◽  
Southern Hemisphere ◽  
Optical Spectra ◽  
Radio Sources ◽  
Celestial Reference Frame
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