Models for the formation of massive stars [PDF]
, 2009 The formation of massive stars is currently an unsolved problems in astrophysics. Understanding the formation of massive stars is essential because they dominate the luminous, kinematic, and chemical output of stars. Furthermore, their feedback is likely to play a dominant role in the evolution of molecular clouds and any subsequent star formation ...
Ian A. Bonnell, Mark R. Krumholz
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A Well-Behaved Anisotropic Strange Star Model
Advances in Mathematical Physics, 2022 We obtain a new nonsingular exact model for compact stellar objects by using the Einstein field equations. The model is consistent with stellar star with anisotropic quark matter in the absence of electric field.
Amos V. Mathias, Jefta M. Sunzu
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Carbon-enhanced metal-poor stars: a window on AGB nucleosynthesis and binary evolution. II. Statistical analysis of a sample of 67 CEMP-$s$ stars [PDF]
A&A 581, A22 (2015), 2015 Many observed CEMP stars are found in binary systems and show enhanced abundances of $s$-elements. The origin of the chemical abundances of these CEMP-$s$ stars is believed to be accretion in the past of enriched material from a primary star in the AGB phase.
arxiv +1 more source
Remote Sensing, 2022 The rolling shutter effect decreases the accuracy of the attitude measurement of star trackers when they work in rolling shutter exposure mode, especially under dynamic conditions.
Zongqiang Fu +6 more
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Telework in the post-pandemic scenario: structural elements driving the implementation of the model
Revista Eletrônica de Ciência AdministrativaThe objective of this study was to identify the structural guiding elements for the implementation of a telecommuting model in the post-pandemic scenario.
Hericson Caprioli +1 more
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Modeling the nucleosynthesis of massive stars [PDF]
New Astronomy Reviews, 2004 Invited talk at the workshop "Astronomy with Radioactivities IV", Seeon, Germany, June 2003; 6 pages, to appear in New Astronomy ...
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Ground Testing Strategies for Verifying the Slew Rate Tolerance of Star Trackers
Sensors, 2014 The performance of a star tracker is largely based on the availability of its attitude solution. Several methods exist to assess star tracker availability under both static and dynamic imaging conditions.
Tom Dzamba, John Enright
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A Study of Wolf-Rayet stars Formed via Chemically Homogeneous Evolution [PDF]
, 2018 Using the stellar evolution code---Modules for Experiments in Stellar Astrophysics (MESA), we investigate the evolution of massive stars with different rotational velocities and metallicities towards Wolf-Rayet stars. In our simulations, the initial rotating velocities are taken as 0, 250, 500 and 650 km s$^{-1}$, and the metallicities equal to 0.02, 0.
arxiv +1 more source
Optical System Error Analysis and Calibration Method of High-Accuracy Star Trackers
Sensors, 2013 The star tracker is a high-accuracy attitude measurement device widely used in spacecraft. Its performance depends largely on the precision of the optical system parameters.
Zheng You, Fei Xing, Ting Sun
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Beta Cephei stars in the ASAS-3 data. II. 103 new Beta Cephei stars and a discussion of low-frequency modes [PDF]
, 2007 We analysed ASAS-3 photometry of bright early-type stars with the goal of finding new Beta Cephei stars. We were particularly interested in stars that would be good for seismic analysis, i.e., stars that (i) have a large number of excited modes, (ii) show rotationally split modes, (iii) are components of eclipsing binary systems, (iv) have low ...
arxiv +1 more source