scholarly journals Narrowband HST images of microstructures in Planetary Nebulae

1997 ◽  
Vol 180 ◽  
pp. 208-208 ◽  
Author(s):  
B. Balick ◽  
J. Alexander ◽  
A. Hajian ◽  
Y. Terzian ◽  
M. Perinotto ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Space Telescope ◽  
Ionization Gradient

Hubble Space Telescope narrowband images of four PNe resolve the microstructures in four PNe known to contain FLIERs (e.g. Balick et al 1994). FLIERs are seen to fall into two morphological groups: very low ionization clumps of small knots with cometary-like tails, and sinewy transverse filaments with fainter extensions pointing outward from the nucleus. Generally speaking, FLIERs exhibit [NII]λ6584/Hα > 1. They are marginally detectable in Hα above the bright background of nebular emission, and all but invisible in [O III]λ5007A. In every case the star-facing side of the structure is on the order of a pixel in width (about 1015 cm). A decreasing ionization gradient is seen [O I]λ6300A, [S II]λ6717 + 31A, and [N II]λ6584A images.

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 Hubble Space Telescope Images of Four Magellanic Cloud Planetary Nebulae

1993 ◽  
Vol 155 ◽  
pp. 213-213
Author(s):  
M. J. Barlow ◽  
J. C. Blades ◽  
S. Osmer ◽  
Keyword(s):  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Circular Ring ◽  
Uniform Structure ◽  
Full Description ◽  
Type I ◽  
Space Telescope ◽  
Ring Shape ◽  
Faint Object ◽  
Northern Edge

Using the Faint Object Camera on-board the Hubble Space Telescope, we have obtained images of four planetary nebulae in the Magellanic Clouds, namely N2 and N5 in the SMC and N66 and N201 in the LMC. Each nebula was imaged through narrow-band filters isolating [O III] λ5007 and Hβ, for a nominal exposure time of 1000 seconds in each filter. The f/96 optical chain of the FOC was used, yielding 512×512 0.022 arcsec square pixels. Considerable detail is evident on the raw images and after deconvolution using the Richardson-Lucy algorithm, structures as small as 0.06 arcsec are easily discernible. Figure 1 shows NS and EW intensity cross-cuts through the deconvolved [O III] λ5007 images of SMC N2 and SMC N5. SMC N2 is a slightly ellleptical ringlike nebula, with its greatest elongation in the EW direction. The peak-to-peak dimensions of the ring are 0.21×0.26 arcsec2. SMC N5 has a circular ring shape, with the [O III] λ5007 image showing a clearly defined, nearly uniform structure, apart from a bright patch at the northern edge. The peak-to-peak diameter of the ring is 0.26 arcsec and the ring itself is significantly narrower than that of SMC N2, with a width as small as 0.06 arcsec (FWHM) in some places. LMC N201 is very compact, with a FWHM of 0.21 arcsec in the Hβ image. The Type I PN LMC N66 is a multi-polar nebula, with the brightest part having an extent of about 2 arcsec. Its structure is extremely complex, with several bright knots and faint loops visible outside the two bright lobes. A full description of our results can be found in Blades et al., ApJ,398, L41–44.

scholarly journals Imaging of Magellanic Cloud Planetary Nebulae by the Hubble Space Telescope

1993 ◽  
Vol 155 ◽  
pp. 212-212
Author(s):  
M. A. Dopita ◽  
S. J. Meatheringham ◽  
P. R. Wood ◽  
H. C. Ford ◽  
R. C. Bohlin ◽  
...  
Keyword(s):  
Point Spread Function ◽  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Magellanic Cloud ◽  
Space Telescope ◽  
Point Spread ◽  
Spread Function ◽  
Made In

We have obtained Hubble Space Telescope (HST) Planetary Camera (PC) images of a number of Magellanic Cloud planetary nebulae. The objects, except for SMP 83 were observed as part of the Cycle I GO program. The observations were made in the [O III] λ5007Å line. The object SMP 83, was observed as part of the GTO program, and in this case observations were also made in the Hα line using the F650N filter. In order to characterise the point spread function, a star was placed at the same point on the chip as the PN. This allowed us to determine the diameters of barely resolved PN in an accurate manner, by convolving the PSF with a function until it matched the appearance of the PN image. The results are given in Table 1.

scholarly journals Distances to Planetary Nebulae

1989 ◽  
Vol 131 ◽  
pp. 65-72
Author(s):  
Julie H. Lutz
Keyword(s):  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Significant Progress ◽  
Space Telescope ◽  
The Past ◽  
New Methods ◽  
Work Done

Finding distances to planetary nebulae remains a frustrating undertaking, but significant progress has been made over the past several years. This review covers primarily work done on distances since 1980, with some references to earlier papers. Some interesting new methods have been tried recently and some methods that have been used for years have been refined. Missions such as the Hubble Space Telescope and Hipparcos may provide new data on distances. Advances in ground-based telescopes and instruments will make possible new studies of distances.

scholarly journals First Results from a Panchromatic HST/WFC3 Imaging Study of the Young, Rapidly Evolving Planetary Nebulae NGC 7027 and NGC 6302

Galaxies ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 49
Author(s):  
Joel H. Kastner ◽  
Jesse Bublitz ◽  
Bruce Balick ◽  
Rodolfo Montez ◽  
Adam Frank ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Imaging Study ◽  
Planetary Nebulae ◽  
Wide Field ◽  
Space Telescope ◽  
Near Ir ◽  
Ngc 7027 ◽  
First Results ◽  
Initial Color ◽  
Line Imaging

We present the first results from comprehensive, near-UV-to-near-IR Hubble Space Telescope Wide Field Camera 3 (WFC3) emission-line imaging studies of two young planetary nebulae (PNe), NGC 7027 and NGC 6302. These two objects represent key sources for purposes of understanding PNe shaping processes. Both nebulae feature axisymmetric and point-symmetric (bipolar) structures and, despite hot central stars and high nebular excitation states, both harbor large masses of molecular gas and dust. The sweeping wavelength coverage of our Cycle 27 Hubble Space Telescope (HST)/WFC3 imaging surveys targeting these two rapidly evolving PNe will provide a battery of essential tests for theories describing the structural and chemical evolution of evolved star ejecta. Here, we present initial color overlays for selected images, and we highlight some of the first results gleaned from the surveys.

scholarly journals [ITAL]Hubble Space Telescope[/ITAL] Expansion Parallaxes of the Planetary Nebulae NGC 6578, NGC 6884, NGC 6891, and IC 2448

2002 ◽  
Vol 123 (5) ◽  
pp. 2666-2675 ◽  
Author(s):  
Stacy Palen ◽  
Bruce Balick ◽  
Arsen R. Hajian ◽  
Yervant Terzian ◽  
Howard E. Bond ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Space Telescope

Hubble Space Telescope Observations of Planetary Nebulae in the Magellanic Clouds

1997 ◽  
pp. 417-427 ◽  
Author(s):  
M. A. Dopita ◽  
P. R. Wood ◽  
S. J. Meatheringham ◽  
E. Vassiliadis ◽  
R. C. Bohlin ◽  
...  
Keyword(s):  
Hubble Space Telescope ◽  
Planetary Nebulae ◽  
Magellanic Clouds ◽  
Space Telescope
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