Results 71 to 80 of about 1,478 (224)

Modeling the circumstellar interaction around SN 2004gq

Context. The relationship between the mass-loss history and final evolutionary stage of massive stars and the properties of the observable supernova (SN) is still under debate.
B. H. Pál, A. P. Nagy, T. Szalai
core   +1 more source

SN 2022jox: An Extraordinarily Ordinary Type II SN with Flash Spectroscopy

The Astrophysical Journal
We present high-cadence optical and ultraviolet (UV) observations of the Type II supernova (SN), SN 2022jox which exhibits early spectroscopic high-ionization flash features of H i , He ii , C iv , and N iv that disappear within the first few days after ...
Jennifer E. Andrews, Jeniveve Pearson, Griffin Hosseinzadeh, K. Azalee Bostroem, Yize Dong, Manisha Shrestha, Jacob E. Jencson, David J. Sand, S. Valenti, Emily Hoang, Daryl Janzen, M. J. Lundquist, Nicolás Meza, Samuel Wyatt, Saurabh W. Jha, Chris Simpson, Joseph Farah, Estefania Padilla Gonzalez, D. Andrew Howell, Curtis McCully, Megan Newsome, Craig Pellegrino, Giacomo Terreran   +22 more
doaj   +1 more source

Supernova interactions with aspherical circumstellar material

Astronomy & Astrophysics
We present upgraded detailed numerical calculations of supernova (SN) interactions with significantly aspherical circumstellar matter (CSM), primarily formed as a disc or bipolar lobes.
Kurfürst P., Bless G., Fišák J., Holoubek F., Krtička J., Kubátová B., Kubát J., Zajaček M.   +7 more
doaj   +1 more source

Recent and Future Studies of Circumstellar Matter – A Snapshot [PDF]

Symposium - International Astronomical Union, 1999
At this meeting, powerful new images and spectroscopy of AGB stars were presented. Theoretical models have advanced, and we are learning more from studies of the pre-solar grains isolated from meteorites.We suggest that several mass loss mechanisms may be operating in AGB stars: current images imply both spherical winds and highly flattened outflows ...
openaire   +1 more source

Commentary on the role of polyoxometalates in nature cybernetic loop

Natural Sciences, Volume 4, Issue 2-3, June-July 2024.
Polyoxometalates (POMs) are both synthetic and naturally occurring coordination compounds. In the biosphere, POMs can participate in many different life‐determining geochemical and biological processes. Future interdisciplinary research on POMs may reveal their potential for prebiotic and abiotic chemistry, as well as for the development of artificial ...
Kirill Yu. Monakhov
wiley   +1 more source

Can circumstellar interaction explain the strange light-curve features of Type Ib/c supernovae?

Context. The evolution and surrounding of the progenitors of stripped-envelope supernovae are still debated: some studies suggest single-star progenitors, but others prefer massive binary progenitors.
Andrea P. Nagy, Zsófia R. Bodola
core   +1 more source

High-resolution Near-Infrared Spectroscopy of the B[e] Supergiant LHA 115-S 18: Discovery of Hot Water Vapor Emission

The Astrophysical Journal Letters
The post-main-sequence evolution of massive stars involves phases of intense, often eruptive mass loss, including the B[e] supergiant phase. These hot stars are surrounded by cool, dense circumstellar disks that host complex chemistry, producing both ...
María Laura Arias, Andrea Fabiana Torres, Michaela Kraus, Lydia Sonia Cidale   +3 more
doaj   +1 more source

Origin of Circumstellar Matter in the Spectroscopic Binary CX Dra [PDF]

International Astronomical Union Colloquium, 2000
AbstractWe examine the periodic component in the polarization of CX Dra, a spectroscopic binary with an orbital period of 7 days. We find that this component originates in dense matter located in the direction preceding the secondary by about 4.5° from the primary-secondary direction. This dense scattering region is attributable to the region where the
Hidetoshi Iwamatsu, Ryuko Hirata, Seiji Masuda   +2 more
openaire   +1 more source

The deep eclipses of RW Aur revisited by long‐term photometric and spectroscopic monitoring

Astronomische Nachrichten, Volume 345, Issue 4, May 2024.
Abstract RW Aurigae is a young stellar system containing a classical T Tauri star as the primary component. It shows deep, irregular dimmings, first detected in 2010. At the University Observatory Jena, we carried out optical follow‐up observations. We performed multiband (BVRI) photometry of the system with the Cassegrain‐Teleskop‐Kamera II and the ...
Oliver Lux, Markus Mugrauer, Richard Bischoff   +2 more
wiley   +1 more source

The Enigmatic, Highly Variable, High-Mass Young Stellar Object Mol 12: A New Extreme Herbig Be (Proto)star

Galaxies
We report new medium-resolution spectroscopy covering the wavelength range from 0.6 to 2.4 μm, as well as multi-epoch, multi-wavelength photometry, of the Class I high-mass embedded young stellar object Mol 12 (IRAS 05373+2349). It is embedded (AV≃12) in
Mauricio Tapia, Paolo Persi, Jesús Hernández, Nuria Calvet   +3 more
doaj   +1 more source