Results 81 to 90 of about 2,154,904 (218)

Probing the Mass-loss Histories of Type IIn and Type II-L Supernovae with Late-time Radio Observations

The Astrophysical Journal
We present Very Large Array observations of 16 Type IIn and Type II-L supernovae (SNe IIn and SNe II-L) at ≈1000–7000 days after explosion, probing circumstellar matter (CSM) at distances >10 ^16  cm from the progenitor. At these radii, the data directly
Charles D. Kilpatrick, Lindsay DeMarchi, Wen-fai Fong, Jennifer E. Andrews, Ori D. Fox, Nathan Smith   +5 more
doaj   +1 more source

The circumstellar matter in the Be + K binary KX and seen in the uv spectra [PDF]

Symposium - International Astronomical Union, 1987
KX And (HD 218393) belongs to well-known and often observed Be stars. The periodicity of spectroscopic characteristics as well as other observations led to the conclusion that the star is a peculiar interacting binary (Harmanec et al. 1980). The aim of this paper is to present the phase-dependent behaviour of the UV spectrum of the star.
openaire   +1 more source

Evolution of the circumstellar disc of alpha Eri

, 2006
3 pages ; to appear in the proceedings of the Sapporo meeting on active OB stars ; ASP Conference Series ; eds: S. Stefl, S. Owocki and A. OkazakiThe Halpha line emission formation region in the circumstellar disc of alpha Eri is: a) extended with a ...
Vinicius, M.M.F., Leister, N.V., Zorec, J., Levenhagen, R.S.   +3 more
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

Detection of C60 in circumstellar environments

, 2016
Buckminsterfullerene (C60) was recently discovered in the infrared spectra of a series of circumstellar envelopes. Given their remarkable stability, C60 and its derivatives are presumably able to survive during the envelope dispersion into the ...
Zhang, Y
core  

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

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

Reparations as balance

Journal of Social Philosophy, Volume 55, Issue 4, Page 624-642, Winter 2024.
Luke Moffett
wiley   +1 more source

Explosive Nucleosynthesis in Core-collapse Type II Supernovae: Insights from New C, N, Si, and Al–Mg Isotopic Compositions of Presolar Grains

The Astrophysical Journal Letters
We report C, N, Si, and Al–Mg isotope data for 39 presolar X silicon carbide (SiC) and four silicon nitride grains—a group of presolar grains that condensed in the remnants of core-collapse Type II supernovae (CCSNe)—isolated from the Murchison meteorite.
Nan Liu, Conel M. O’D. Alexander, Bradley S. Meyer, Larry R. Nittler, Jianhua Wang, Rhonda M. Stroud   +5 more
doaj   +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