Results 31 to 40 of about 195,329 (258)

Integral Field Spectroscopy of Planetary Nebulae with MUSE

Galaxies, 2020
The Multi-Unit Spectroscopic Explorer (MUSE) is a large integral field unit mounted on the ESO Very Large Telescope. Its spatial (60 arcsecond field) and wavelength (4800–9300Å) coverage is well suited to detailed imaging spectroscopy of extended ...
Jeremy R. Walsh, Ana Monreal-Ibero
doaj   +1 more source

Planetary Nebulae: Abundances and Abundance Gradients [PDF]

, 2000
In this work, a review is given of some recent results and problems involved in the determination of chemical abundances of galactic planetary nebulae, particularly regarding disk and bulge objects.
openaire   +2 more sources

The solar wind heavy ion composition in the ascending phases of the solar cycles 23 and 25

Frontiers in Astronomy and Space Sciences
The approximately 11-year solar cycle has been shown to impact the heavy ion composition of the solar wind, even when accounting for streams of differing speeds; however, the heavy ion composition observed between the same specific phases of a past solar
D. T. Carpenter, S. T. Lepri, L. Zhao, R. M. Dewey, J. M. Raines, S. Livi, S. Livi, A. B. Galvin, L. M. Kistler   +8 more
doaj   +1 more source

Bewertung und Verbesserung der Biodiversität in landwirtschaftlichen Gebieten unter besonderer Berücksichtigung von Vogelarten als Bioindikatoren

Julius-Kühn-Archiv, 2013
Agricultural landscapes have crucial functions for biodiversity conservation. Contrary to the goals of biodiversity protection the habitat functions and the biological diversity are deteriorating, especially in arable areas.
Hoffmann, Jörg, Wiegand, Ina, Wittchen, Udo, Ehlert, Sigrid, Berger, Gert, Pfeffer, Holger   +5 more
doaj   +1 more source

Chemical fingerprints of He-sdO stars

Open Astronomy, 2018
The chemical composition of helium-rich hot subluminous O stars plays an important role to understand and model their formation history. We present a spectroscopic analysis of four He-sdO stars,CD-31° 4800, [CW83] 0904- 02, LSS 1274 and LS IV +10° 9. The
Schindewolf Markus, Németh Peter, Heber Ulrich, Battich Tiara, Bertolami Marcelo M. Miller, Latour Marilyn   +5 more
doaj   +1 more source

Chemical Composition of RM_1-390 - Large Magellanic Cloud Red Supergiant [PDF]

Journal of Astronomy and Space Sciences, 2017
A high resolution spectroscopic observation of the red supergiant star RM_1-390 in the Large Magellanic Cloud was made from a 3.6 m telescope at the European Southern Observatory. Spectral resolving power was R=20,000, with a signal-to-noise ratio S/N >
Alexander V. Yushchenko, Yeuncheol Jeong, Vira F. Gopka, Svetlana V. Vasil’eva, Sergey M. Andrievsky, Volodymyr O. Yushchenko   +5 more
doaj   +1 more source

Asymmetrical thermonuclear supernovae triggered by the tidal disruption of white dwarfs

Astronomy & Astrophysics
In a dense star cluster core, a tidal disruption event (TDE) of a white dwarf (WD) can occur if the WD passes within the tidal radius of an intermediate-mass black hole (IMBH).
Vynatheya Pavan, Dessart Luc, Ryu Taeho, Pakmor Rüdiger   +3 more
doaj   +1 more source

Atomic diffusion in the atmosphere of Feige 86

Open Astronomy, 2017
We have revisited the ultraviolet and optical spectra of the blue horizontal branch star Feige 86. The new analysis finds the star cooler and more compact than previously determined. The IUE spectrum of Feige 86 holds numerous unidentified spectral lines
Németh Péter
doaj   +1 more source

Ba Isotope Ratio in CEMP-s and CEMP-rs Stars as a Signature of s-Process and i-Process

Galaxies
We present a spectroscopic analysis of three carbon-enhanced metal-poor (CEMP) stars of type CEMP-s and CEMP-rs and determine their non-local thermodynamic equilibrium (NLTE) abundances of Ba and the fractions of the odd Ba isotopes (Fodd). We found Fodd
Tatyana Sitnova, Lyudmila Mashonkina
doaj   +1 more source

Results of 40-year Studies of the X-Ray Binary Cyg X-1 = V1357 Cyg

Open Astronomy, 2016
This paper reviews the results of our 40-year studies of Cyg X-1 using various methods and observational data: mainly optical photometric, spectroscopic, and polarimetric ones, with X-ray data also considered.
Karitskaya E. A.
doaj   +1 more source