Results 61 to 70 of about 650 (183)

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

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

Gas-phase Molecules in Protoplanetary Nebulae with the 21 μm Emission Feature. II. Carbon Monosulfide

The Astronomical Journal
The carrier of the 21 μ m emission feature discovered in a handful of protoplanetary nebulae (PPNe) is one of the most intriguing enigmas in circumstellar chemistry.
Jian-Jie Qiu, Yong Zhang, Deng-Rong Lu, Zheng-Xue Chang, Jiang-Shui Zhang, Xiao-Hu Li, Xin-Di Tang, Yisheng Qiu, Jun-ichi Nakashima, Lan-Wei Jia   +9 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

SN 2024abvb: A Type Icn Supernova in the Outskirts of Its Host Galaxy

The Astrophysical Journal
We present multiband photometric and spectroscopic observations of supernova (SN) 2024abvb, which exhibits early-time prominent photoionized narrow emission lines of C II superposed on a blue continuum.
Maokai Hu, Shengyu Yan, Xiaofeng Wang, Abdusamatjan Iskandar, Jujia Zhang, Liping Li, Ali Esamdin, Letian Wang, Lingzhi Wang, Alexei V. Filippenko, Thomas G. Brink, Liyang Chen, Ruifeng Huang, Lifan Wang   +13 more
doaj   +1 more source

SN 2024dy: Dust Formation in a Long-lived Type IIn Supernova and Constraints on the Dust Mass

The Astrophysical Journal
Type IIn supernovae (SNe) are a subclass of core-collapse SNe powered by interaction between the ejecta and the dense circumstellar material. Among them, long-lived Type IIn events are characterized by luminous, long-duration light curves with high ...
Sota Goto, Masayuki Yamanaka, Koji S. Kawabata, Masaomi Tanaka, Avinash Singh, Devendra K. Sahu, Tatsuya Nakaoka, Anjasha Gangopadhyay, Takahiro Nagayama, Naveen Dukiya, Monalisa Dubey, Kuntal Misra, Bhavya Ailawadhi   +12 more
doaj   +1 more source

SN 2021ukt: A Transitional Supernova with a Short Plateau and Persistent Interaction

The Astrophysical Journal
We present spectroscopic and photometric observations of SN 2021ukt, a peculiar short-plateau object that was originally identified as a Type IIn supernovae (SN) and later underwent an unprecedented transition to a Type Ib (possibly Type IIb) SN.
Neil R. Pichay, Sergiy S. Vasylyev, Audrey M. Liddle, Alexei V. Filippenko, Yi Yang, WeiKang Zheng, Thomas G. Brink, Matthew Graham, Daniel Stern, Daichi Hiramatsu, Claudia P. Gutiérrez, K. Azalee Bostroem, Estefania Padilla Gonzalez, D. Andrew Howell, Curtis McCully, Megan Newsome, Craig Pellegrino, Giacomo Terreran, Ivan Altunin, Raphael Baer-Way, Vidhi Chandler, Asia A. deGraw, Connor F. Jennings, Michael B. May   +23 more
doaj   +1 more source

Inferring a Dense Confined Circumstellar Medium around Supernova Progenitors via Long-term Hydrodynamical Evolution

The Astrophysical Journal Letters
Circumstellar interaction of supernova (SN) ejecta is an essential process in its evolution, and observations of SNe have found the signature of circumstellar interaction in both the early and late evolutionary phases of SNe. In this Letter, we show that
Tomoki Matsuoka, Keiichi Maeda, Ke-Jung Chen   +2 more
doaj   +1 more source

JWST Imaging of Edge-on Protoplanetary Disks. I. Fully Vertically Mixed 10 μm Grains in the Outer Regions of a 1000 au Disk

The Astronomical Journal
Scattered light imaging of protoplanetary disks provides key insights on the geometry and dust properties in the disk surface. Here, we present James Webb Space Telescope (JWST) 2–21 μ m images of a 1000 au radius edge-on protoplanetary disk surrounding ...
Gaspard Duchêne, François Ménard, Karl R. Stapelfeldt, Marion Villenave, Schuyler G. Wolff, Marshall D. Perrin, Christophe Pinte, Ryo Tazaki, Deborah L. Padgett   +8 more
doaj   +1 more source