Results 41 to 50 of about 2,019 (232)
JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4
Astronomische Nachrichten, Volume 346, Issue 2, February 2025.ABSTRACT We combine infrared (IR) observations collected by the James Webb Space Telescope with optical deep images by the Hubble Space Telescope taken ~20 years earlier to compute proper‐motion membership for the globular cluster (GC) M4 (NGC 6121) along its entire white dwarf (WD) cooling sequence (CS).
Luigi R. Bedin +11 more
wiley +1 more source
The Astrophysical Journal LettersThe signal from a transiting planet can be diluted by astrophysical contamination. In the case of circumstellar debris disks, this contamination could start in the mid-infrared and vary as a function of wavelength, which would then change the observed ...
Laura Flagg +23 more
doaj +1 more source
XMM‐Newton Observations of the Peculiar Be X‐Ray Binary A0538‐66
Astronomische Nachrichten, Volume 346, Issue 1, January 2025.ABSTRACT A0538‐66 is a neutron star/Be x‐ray binary located in the Large Magellanic Cloud and, since its discovery in the 70s, it showed a peculiar behavior that makes it a unique object in the high‐mass x‐ray binaries scene: the extremely eccentric orbit (e=0.72$$ e=0.72 $$), the short spin period of the neutron star (P=69$$ P=69 $$ ms), the episodes ...
Michela Rigoselli +3 more
wiley +1 more source
Circumstellar Disks and Star Formation [PDF]
Highlights of Astronomy, 1992 Results from the IRAS satellite showed that many pre-main sequence stars exhibited unexpectedly large fluxes in the infrared spectral region. Several studies have shown that the simplest and most satisfying explanation of this excess emission is that it arises in optically-thick, dusty, circumstellar disks (Rucinski 1985; Adams, Lada, and Shu 1987 ...
L. Hartmann, M. Gomez, S.J. Kenyon
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Astronomische Nachrichten, Volume 345, Issue 8, October 2024.Abstract Astrophysical accretion discs that carry a significant mass compared with their central object are subject to the effect of self‐gravity. In the context of circumstellar discs, this can, for instance, cause fragmentation of the disc gas, and—under suitable conditions—lead to the direct formation of gas‐giant planets.
Oliver Gressel, Udo Ziegler
wiley +1 more source
Natural Sciences, Volume 4, Issue 4, October 2024.Large free aromatic species, with up to 61 carbon atoms, were detected in grains of the Ryugu carbonaceous asteroid using ultra‐sensitive two‐step laser mass spectrometry. This discovery confirms the presence of large polycyclic aromatic hydrocarbons in the interstellar medium and provides new information on the formation and evolution of organic ...
Hassan Sabbah +3 more
wiley +1 more source
Complex Structure around a Circumstellar Disk Caused by Interchange Instability
The Astrophysical Journal LettersWe perform a three-dimensional nonideal magnetohydrodynamic simulation of a strongly magnetized cloud core and investigate the complex structure caused by the interchange instability. This is the first simulation that does not use a central sink cell and
Masahiro N. Machida, Shantanu Basu
doaj +1 more source
Analysis of star-disk interaction in young stellar systems
EPJ Web of Conferences, 2014 We present preliminary results of the study of star-disk interaction in the classical T Tauri star V354 Mon, a member of the young stellar cluster NGC 2264.
Fonseca N.N.J. +2 more
doaj +1 more source
, 1999 33 pages, 12 figures, to be published in The Physics of Star Formation and Early Evolution II, C.J. Lada and N.D.
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CIRCUMSTELLAR DEBRIS DISKS: DIAGNOSING THE UNSEEN PERTURBER [PDF]
The Astrophysical Journal, 2016 ABSTRACT The first indication of the presence of a circumstellar debris disk is usually the detection of excess infrared emission from the population of small dust grains orbiting the star. This dust is short-lived, requiring continual replenishment, and indicating that the disk must be excited by an unseen perturber.
Erika R. Nesvold +3 more
openaire +2 more sources