Results 111 to 120 of about 116,162 (381)

Search for white dwarf companions of cool stars with peculiar element abundances [PDF]

A search for a white dwarf companions of cool stars with peculiar element abundances was undertaken. One additional star the xi Cet, was found with a white dwarf companion.
Boehm-Vitense, E.
core   +1 more source

Pulsating white dwarf stars and asteroseismology [PDF]

, 2016
At present, a large number of pulsating white dwarf (WD) stars is being discovered either from Earth-based surveys such as the Sloan Digital Sky Survey, or through observations from space (e.g., the Kepler mission).
Córsico, Alejandro H.
core   +1 more source

Confirmation of a Non‐Transiting Planet in the Habitable Zone of the Nearby M Dwarf L 98‐59

Astronomische Nachrichten, EarlyView.
ABSTRACT Only 40 exoplanetary systems with five or more planets are currently known. These systems are crucial for our understanding of planet formation and planet‐planet interaction. The M dwarf L 98‐59 has previously been found to show evidence of five planets, three of which are transiting.
Paul I. Schwarz, Stefan Dreizler, René Heller   +2 more
wiley   +1 more source

Discovery of a luminous white dwarf in a young star cluster in the Large Magellanic Cloud

, 1998
We have identified a candidate 1-2 x 10^5 year old luminous white dwarf in NGC 1818, a young star cluster in the Large Magellanic Cloud. This discovery strongly constrains the boundary mass M_c at which stars stop forming neutron stars and start forming ...
Boyle B. J., Colless M., Gerard F. Gilmore, Jarrod Hurley, Jeffries R. D., Koester D., Melvyn B. Davies, Rebecca A. W. Elson, Santiago B., Schaller G., Steinn Sigurdsson, van den Bergh S., Will   +12 more
core   +1 more source

Discovery and Initial Investigation of a New Low Surface Brightness Planetary Nebula Candidate at High Galactic Latitude

Astronomische Nachrichten, EarlyView.
ABSTRACT Planetary nebulae represent a late evolutionary phase of low‐ to intermediate‐mass stars. In this article, we present the serendipitous discovery of a previously unknown, faint potential Galactic planetary nebula (PN) in the constellation Camelopardalis, identified during a survey‐inspection, aiming at the detection of dwarf companions of the ...
W. E. Celnik, P. Köchling, S. Kotov, J. Kozok, Y. Galata, L. Magrini, A. Moiseev, M. Nischang, C. Reese, P. Remmel, P. Riepe, T. Zilch, K. Werner   +12 more
wiley   +1 more source

Indonesian inquiry: A narrative of biocultural teaching on Sulawesi Utara

British Educational Research Journal, EarlyView.
Abstract Using phenomenology, narrative inquiry and autoethnographic approaches, this study analyses a program of faculty development conducted alongside the delivery of an international field school. Through this study, we explore the value and benefits of inter‐cultural field programming and how these might serve to complement or to redress ...
David Zandvliet, Wiske Rotinsulu
wiley   +1 more source

Spitzer White Dwarf Planet Limits [PDF]

, 2006
We present preliminary limits on the presence of planets around white dwarf stars using the IRAC photometer on the Spitzer space telescope. Planets emit strongly in the mid-infrared which allows their presence to be detected as an excess at these ...
Mullally, F., von Hippel, Ted, Winget, D. E.   +2 more
core   +2 more sources

The Impact of Breathing Pulses during Core Helium Burning on the Core Chemical Structure and Pulsations of Hydrogen-rich Atmosphere White Dwarfs

The Astrophysical Journal
Breathing pulses are mixing episodes that could develop during the core helium-burning phase of low- and intermediate-mass stars. The occurrence of breathing pulses is expected to bear consequences on the formation and evolution of white dwarfs ...
Alejandro H. Córsico, Leandro G. Althaus   +1 more
doaj   +1 more source

Afro‐Amerindian cosmopolitics in environmental education: A decolonial analysis of academic discourses involving the epistemological disputes around the term sustainability

British Educational Research Journal, EarlyView.
Abstract Considering the growing calls for decolonial approaches within the scope of Climate Change and Sustainability Education (CCSE), in this research we seek to understand the meanings which have been put into circulation through research narratives on Environmental Education (EE) concluded in Latin America, regarding Afro‐Amerindian knowledges ...
Danilo Seithi Kato, Luiz Marcelo de Carvalho   +1 more
wiley   +1 more source

Helium-rich EHB Stars in Globular Clusters

, 2003
Recent UV observations of the most massive Galactic globular clusters show a significant population of hot stars below the zero-age HB (``blue hook'' stars), which cannot be explained by canonical stellar evolution.
Dreizler, S., Landsman, W. B., Moehler, S., Sweigart, A. V.   +3 more
core   +1 more source