Results 51 to 60 of about 17,929 (222)

NASA plans relevant to the study of circumstellar matter [PDF]

Symposium - International Astronomical Union, 1987
The Astrophysics program of the National Aeronautics and Space Administration of the United States emphasizes use of vehicles to obtain above-the-atmosphere observational advantages, including expanded electromagnetic frequency access, enhanced sensitivity resulting from reduced or eliminated atmospheric absorption of light and image smearing.
openaire   +1 more source

Distribution of magnetically confined circumstellar matter in oblique rotators [PDF]

Astronomy & Astrophysics, 2004
We consider the mechanical equilibrium and stability of matter trapped in the magnetosphere of a rapidly rotating star. Assuming a dipolar magnetic field and arbitrary inclination of the magnetic axis with respect to the axis of rotation we find stable equilibrium positions a) in a (warped) disk roughly aligned with the magnetic equatorial plane and b)
Preuss, O., Schüssler, M., Holzwarth, V., Solanki, S.   +3 more
openaire   +3 more sources

The Circumstellar Extinction of Planetary Nebulae [PDF]

, 1998
We analyze the dependence of circumstellar extinction on core mass for the brightest planetary nebulae (PNe) in the Magellanic Clouds and M31. We show that in all three galaxies, a statistically significant correlation exists between the two quantities ...
Blocker T., Blocker T., Caldwell J. A. R., George H. Jacoby, Han Z., Kwok S., Mendez R. H., Mendez R. H., Robin Ciardullo   +8 more
core   +2 more sources

Satellites and Small Bodies With ALMA: Insights Into Solar System Formation and Evolution

AGU Advances, Volume 6, Issue 6, December 2025.
Abstract Our understanding of the formation and evolution of planetary systems has made major advances in the past decade. This progress has been driven in large part by the Atacama Large Millimeter/submillimeter Array (ALMA), which has given us an unprecedented view of solar system bodies themselves, and of the structure and chemistry of forming ...
Katherine de Kleer, Michael E. Brown, Martin Cordiner, Richard Teague   +3 more
wiley   +1 more source

High ions towards white dwarfs: circumstellar line shifts and stellar temperature

, 2011
Based on a compilation of OVI, CIV, SiIV and NV data from IUE, FUSE, GHRS, STIS, and COS, we derive an anti- correlation between the stellar temperature and the high ion velocity shift w.r.t. to the photosphere, with positive (resp.
B. Y. Welsh, Ballet, Bannister, Barstow, Barstow, Barstow, Barstow, Borkowski, Bruhweiler, Christian, Cox, Dalton, Dupree, Dupuis, Farihi, Farihi, Farihi, Finley, Gnat, Holberg, Holberg, Holberg, Kilic, Knauth, Koester, Koutroumpa, Lallement, Landsman, Lehner, M. A. Barstow, Marsh, Melis, Oegerle, Peek, R. Lallement, Redfield, S. L. Casewell, Saffer, Savage, Slavin, Slavin, Vennes, Vennes, Vennes, Vergely, Welsh, Welsh, Welsh, Welsh, Werner, Zuckerman   +50 more
core   +2 more sources

JWST Imaging of the Closest Globular Clusters—VI. The Lowest‐Mass Objects in M 4 and the Galactic Bulge

Astronomische Nachrichten, Volume 346, Issue 9, November 2025.
ABSTRACT We present James Webb Space Telescope observations of M 4—the closest globular cluster—that probe the lower Main Sequence down to the hydrogen‐burning limit. The unveiled stellar sequence reaches much fainter luminosities than previously possible, revealing a few extremely red objects that are consistent with brown dwarfs as cool as Teff∼1000K$
L. R. Bedin, R. Gerasimov, A. Calamida, M. Libralato, M. Scalco, D. Nardiello, M. Griggio, D. Apai, J. Anderson, A. Bellini, A. Burgasser   +10 more
wiley   +1 more source

Detection of a Molecular Hydrogen Envelope around Nova GK Persei

The Astrophysical Journal Letters
The eruption of Nova Persei 1901 (GK Per) occurred 125 yr ago; remarkably, it still holds major surprises. Using data from the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer (SPHEREx), we find that it has a ...
D. P. K. Banerjee, A. Evans, T. Liimets, C. E. Woodward, T. R. Geballe, V. Joshi, S. Starrfield   +6 more
doaj   +1 more source

Recent Progress in Finding Binary Systems with the B[e] Phenomenon

Galaxies, 2023
This paper describes recent studies of the FS CMa-type objects, a group of stars showing the B[e] phenomenon defined in 2007. The objects exhibit strong emission-line spectra with both permitted and forbidden lines suggesting the presence of a B-type ...
Anatoly S. Miroshnichenko, Sergei V. Zharikov, Nadine Manset, Serik A. Khokhlov, Atilkhan S. Nodyarov, Valentina G. Klochkova, Stephen Danford, Aizhan K. Kuratova, Ronald Mennickent, S. Drew Chojnowski, Ashish Raj, Devendra Bisht   +11 more
doaj   +1 more source

PTF 11kx: A Type Ia Supernova with a Symbiotic Nova Progenitor [PDF]

, 2012
There is a consensus that type Ia supernovae (SNe Ia) arise from the thermonuclear explosion of white dwarf stars that accrete matter from a binary companion.
Dilday, B., Horesh, A., Kasliwal, M. M., Kulkarni, S. R.   +3 more
core   +1 more source

Clusters Stagnating During Condensation: Metastable Material or a Separate State of Matter?

Annalen der Physik, Volume 537, Issue 10, October 2025.
Condensation stagnation, that is, the existence of a delay between nucleation and growth during the gas‐phase particle formation, is a crucial phenomenon, which manifests itself as the presence of supercritical clusters in resulting particulates. The light emission signature of stagnant clusters is identified in the magnesium particle flame in air, and,
Nicholas R. Jaramillo, Cole A. Ritchie, Michelle L. Pantoya, Igor E. Agranovski, Igor Altman   +4 more
wiley   +1 more source