368 research outputs found
Development of conductive paraffin/graphene films laminated on fluoroelastomers with high strain recovery and anti-corrosive properties
NMP is supported by the European Research Council (ERC PoC 2015 SILKENE nr. 693670) and by the European Commission H2020 under the Graphene Flagship (WP14 âPolymer compositesâ, n. 696656) and under the FET Proactive (âNeurofibresâ no. 732344). Nanesa srl is acknowledged for supporting us with FESEM analysis
Sub-arcsecond Morphology of Planetary Nebulae
Planetary nebulae (PNe) can be roughly categorized into several broad
morphological classes. The high quality images of PNe acquired in recent years,
however, have revealed a wealth of fine structures that preclude simplistic
models for their formation. Here we present narrow-band, sub-arcsecond images
of a sample of relatively large PNe that illustrate the complexity and variety
of small-scale structures. This is especially true for bipolar PNe, for which
the images reveal multi-polar ejections and, in some cases, suggest turbulent
gas motions. Our images also reveal the presence or signs of jet-like outflows
in several objects in which this kind of component has not been previously
reported.Comment: 7 pages, 7 figures, Accepted for publication in PAS
The Present and Future of Planetary Nebula Research. A White Paper by the IAU Planetary Nebula Working Group
We present a summary of current research on planetary nebulae and their
central stars, and related subjects such as atomic processes in ionized
nebulae, AGB and post-AGB evolution. Future advances are discussed that will be
essential to substantial improvements in our knowledge in the field.Comment: accepted for publication in RMxAA; 37 page
The Unusual Distributions of Ionized Material and Molecular Hydrogen in NGC 6881: Signposts of Multiple Events of Bipolar Ejection in a Planetary Nebula
The planetary nebula NGC 6881 displays in the optical a quadrupolar
morphology consisting of two pairs of highly collimated bipolar lobes aligned
along different directions. An additional bipolar ejection is revealed by the
hydrogen molecular emission, but its wide hourglass morphology is very
different from that of the ionized material. To investigate in detail the
spatial distribution of molecular hydrogen and ionized material within NGC
6881, and to determine the prevalent excitation mechanism of the H2 emission,
we have obtained new near-IR Br-gamma and H2 and optical H-alpha and [N II]
images, as well as intermediate resolution JHK spectra. These observations
confirm the association of the H2 bipolar lobes to NGC 6881 and find that the
prevalent excitation mechanism is collisional. The detailed morphology and very
different collimation degree of the H2 and ionized bipolar lobes of NGC 6881
not only imply that multiple bipolar ejections have occurred in this nebula,
but also that the dominant shaping agent is different for each bipolar
ejection: a bipolar stellar wind most likely produced the H2 lobes, while
highly collimated outflows are carving out the ionized lobes into the thick
circumstellar envelope. The asymmetry between the southeast and northwest H2
bipolar lobes suggests the interaction of the nebula with an inhomogeneous
interstellar medium. We find evidence that places NGC 6881 in the H II region
Sh 2-109 along the Orion local spiral arm.Comment: 9 pages, 7 figures, 4 table
Spectroscopic confirmation of the planetary nebula nature of PM1-242, PM1-318 and PM1-333 and morphological analysis of the nebulae
We present intermediate resolution long-slit spectra and narrow-band Halpha,
[NII] and [OIII] images of PM1-242, PM318 and PM1-333, three IRAS sources
classified as possible planetary nebulae. The spectra show that the three
objects are true planetary nebulae and allow us to study their physical
properties; the images provide a detailed view of their morphology. PM1-242 is
a medium-to-high-excitation (e.g., HeII4686/Hbeta ~0.4; [NII]6584/Halpha ~0.3)
planetary nebula with an elliptical shape containing [NII] enhanced
point-symmetric arcs. An electron temperature [Te([SIII])] of ~10250 K and an
electron density [Ne([SII])] of ~2300 cm-3 are derived for PM1-242. Abundance
calculations suggest a large helium abundance (He/H ~0.29) in PM1-242. PM1-318
is a high-excitation (HeII4686/Hbeta ~1) planetary nebula with a ring-like
inner shell containing two enhanced opposite regions, surrounded by a fainter
round attached shell brighter in the light of [OIII]. PM1-333 is an extended
planetary nebula with a high-excitation (HeII4686/Hbeta up to ~0.9) patchy
circular main body containing two low-excitation knotty arcs. A low Ne([SII])
of ~450 cm-3 and Te([OIII]) of ~15000 K are derived for this nebula. Abundance
calculations suggest that PM1-333 is a type I planetary nebula. The lack of a
sharp shell morphology, low electron density, and high-excitation strongly
suggest that PM1-333 is an evolved planetary nebula. PM1-333 also shows two
low-ionization polar structures whose morphology and emission properties are
reminiscent of collimated outflows. We compare PM1-333 with other evolved
planetary nebulae with collimated outflows and find that outflows among evolved
planetary nebulae exhibit a large variety of properties, in accordance with
these observed in younger planetary nebula.Comment: Accepted in The Astronomical Journal, 23 pages, 6 figure
New H-band Stellar Spectral Libraries for the SDSS-III/APOGEE survey
The Sloan Digital Sky Survey--III (SDSS--III) Apache Point Observatory
Galactic Evolution Experiment (APOGEE) has obtained high resolution (R
22,500), high signal-to-noise ratio ( 100) spectra in the Hband
(1.51.7 m) for about 146,000 stars in the Milky Way galaxy. We
have computed spectral libraries with effective temperature ()
ranging from 3500 to 8000 K for the automated chemical analy\-sis of the survey
data. The libraries, used to derive stellar parameters and abundances from the
APOGEE spectra in the SDSS--III data release 12 (DR12), are based on ATLAS9
model atmospheres and the ASST spectral synthesis code. We present a
second set of libraries based on MARCS model atmospheres and the spectral
synthesis code Turbospectrum. The ATLAS9/ASST ( =
35008000 K) and MARCS/Turbospectrum ( = 35005500 K) grids
cover a wide range of metallicity (2.5 [M/H] 0.5 dex),
surface gravity (0 log 5 dex), microturbulence (0.5
8 km~s), carbon (1 [C/M] 1 dex),
nitrogen (1 [N/M] 1 dex), and -element (1
[/M] 1 dex) variations, having thus seven dimensions. We
compare the ATLAS9/ASST and MARCS/Turbospectrum libraries and apply
both of them to the analysis of the observed Hband spectra of the Sun and
the K2 giant Arcturus, as well as to a selected sample of well-known giant
stars observed at very high-resolution. The new APOGEE libraries are publicly
available and can be employed for chemical studies in the Hband using other
high-resolution spectrographs.Comment: 45 pages, 11 figures; accepted for publication in the Astronomical
Journa
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