Results 41 to 50 of about 23,039 (206)

A Common Reference Material for Mass‐Dependent Sn Isotope Compositions: An Inter‐Laboratory Calibration Approach

Geostandards and Geoanalytical Research, EarlyView.
Key Points We recommend using the notation δ122/118SnNIST SRM 3161a for mass‐dependent Sn isotope data. We derived conversion factors relative to NIST SRM 3161a for Puri Sn CEZA (0.132 ± 0.011‰), Sn Lyon (0.229 ± 0.016‰), Sn IPGP (0.162 ± 0.018‰). Tin isotope compositions are presented for SPEX CertiPrep Sn and nine USGS reference materials.
Aurélia C.E. Meister, Manuela A. Fehr, Quentin Amet, Gerhard Brügmann, Caroline Fitoussi, Matthias Friebel, Weiqiang Li, Frederic Moynier, Jia‐Xin She, Xueying Wang, Maria Schönbächler   +10 more
wiley   +1 more source

Millimetre Observations of Maser-Emitting Planetary Nebulae

Galaxies, 2022
Observations in the millimetre bands of maser-emitting planetary nebulae (PNe) are crucial to study their circumstellar molecular gas at the beginning of the PN phase.
Lucero Uscanga, José R. Rizzo, Miguel Santander-García, José F. Gómez, Luis F. Miranda, Olga Suárez, Panayotis Boumis, Mónica I. Rodríguez, Gerardo Ramos-Larios, Roldán A. Cala   +9 more
doaj   +1 more source

Decisions Under Radical Uncertainty: The Role of Volitional Liminality in Radical Innovation

Journal of Product Innovation Management, EarlyView.
ABSTRACT Academic Summary Radical innovation management can be understood as an organizational practice that enacts distant futures, which are open‐ended and unknowable. Such radical innovation endeavors are thus characterized by radical uncertainty, where possible futures are not only quantitatively but qualitatively different from the present, and ...
José Antonio Rosa, Marcelo F. de la Cruz Jara, Jelena Spanjol   +2 more
wiley   +1 more source

THE MASSES OF THE IONIZED GAS OF PLANETARY NEBULAE ENVELOPES IN LARGE MAGELLANIC CLOUD

Odessa Astronomical Publications, 2013
The masses of ionized gas in the shells of planetary nebulae which belong in the Large Magellanic Cloud are calculated by three different ways. The value of mass is calculated for the cases: 1) spherical, 2) elliptical forms of envelopes and 3) commonly ...
V. Holovatyy, A. Demchyna
doaj   +1 more source

A Preferred Orientation Angle for Bipolar Planetary Nebulae

Galaxies, 2020
We present preliminary results from measuring Galactic orientation angles of 766 elliptical and bipolar Planetary Nebulae (PNe) in the Hong Kong/Australian Astronomical Observatory/Strasbourg Observatory H-alpha Planetary Nebula research platform and ...
Andreas Ritter, Quentin A. Parker
doaj   +1 more source

Chemical compositions and plasma parameters of planetary nebulae with Wolf-Rayet and wels type central stars [PDF]

, 2006
Aims: Chemical compositions and other properties of planetary nebulae around central stars of spectral types [WC], [WO], and wels are compared with those of `normal' central stars, in order to clarify the evolutionary status of each type and their ...
A. Acker, Acker, Acker, Acker, Acker, Acker, Aller, Aller, Aller, Aller, Barker, Berrington, Brocklehurst, Corradi, Crowther, Cuisinier, Gesicki, Górny, Górny, Górny, Górny, J. Köppen, Kingsburgh, Köppen, Mendoza, Méndez, P. Girard, Peimbert, Peña, Samland, Shaw, Siebenmorgen, Tylenda, Tylenda, Wood, Zijlstra   +35 more
core   +3 more sources

Noble gases and nitrogen in material from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract We report the elemental and isotopic abundances of all stable noble gases (helium, neon, argon, krypton, and xenon) in eight particles from asteroid Bennu returned by NASA's OSIRIS‐REx mission. We also report nitrogen abundances and isotopic ratios that were analyzed alongside neon and argon in four additional Bennu particles.
B. Marty, L. Zimmermann, E. Füri, D. V. Bekaert, J. J. Barnes, A. N. Nguyen, H. C. Connolly, D. S. Lauretta   +7 more
wiley   +1 more source

Searching for Binary Stars in Planetary Nebulae Using the ISIS Image Subtraction Software [PDF]

, 2011
We explored the theory that binary central stars of planetary nebulae may be contributing factor in the formation of planetary nebulae. We searched for this photometric variability in central stars of planetary nebulae because consistent periodic ...
Schwartz, Samantha
core   +2 more sources

A CO Survey of Young Planetary Nebulae

, 2005
We report the results of a sensitive survey of young planetary nebulae in the CO J=2-1 line that significantly increases the available data on warm, dense, molecular gas in the early phases of planetary nebula formation.
Aaquist O. B., Bachiller R., Bachiller R., Durand S., Gesicki K., Gomez Y., Gussie G. T., Huggins P. J., P. Cox, P. J. Huggins, P. Planesas, R. Bachiller, T. Forveille, Webster B. L., Weinberger R., Zijlstra A. A.   +15 more
core   +3 more sources

Small‐scale elemental abundance variations in Ryugu particles from touchdown 1

Meteoritics &Planetary Science, EarlyView.
Abstract Ryugu materials closely resemble CI chondrites' mineralogical, chemical, and isotopic compositions; yet minor but resolvable differences in certain elemental abundances are evident. In this study, the bulk chemical compositions of eight individual Ryugu particles (1.5–4.3 mg) from the first touchdown site (TD1) were determined using triple ...
Karina López García, Tetsuya Yokoyama, Ikshu Gautam, Makiko K. Haba, Tsuyoshi Iizuka, Nao Nakanishi, Ryota Fukai   +6 more
wiley   +1 more source