Results 31 to 40 of about 12,976 (291)
A catalogue of close binaries located in the 6 Scuti region of the Cepheid instability strip [PDF]
, 2006 A catalogue of close eclipsing binary systems (detached and semidetached) with at least one of the components located in the S Scuti region of the Cepheid instability strip is presented.
Soydugan E. +3 more
core +2 more sources
DISCOVERY OF TWO LITHIUM CEPHEIDS IN THE GALAXY
Odessa Astronomical Publications, 2017 We report about the discovery of two lithium Cepheids in the Galaxy, based on observations made with the echelle spectrograph of the Apache Point Observatory. We have used high- resolution, high signal-to-noise spectra to determine abundances of chemical
V. V. Kovtyukh +2 more
doaj +1 more source
Resonant Mode Coupling in δ Scuti Stars
The Astrophysical Journal, 2023 Delta Scuti ( δ Sct) variables are intermediate-mass stars that lie at the intersection of the main sequence and the instability strip on the Hertzsprung–Russell diagram.
Mohammed Mourabit, Nevin N. Weinberg
doaj +1 more source
Wear of Functionally Graded Coatings under Frictional Heating Conditions
Nanomaterials, 2021 Multilayered and functionally graded coatings are extensively used for protection against wear of the working surfaces of mechanisms and machines subjected to sliding contact.
Vladimir B. Zelentsov +2 more
doaj +1 more source
Pulsation in Intermediate-Mass Stars
Frontiers in Astronomy and Space Sciences, 2018 A new perspective of pulsation in stars within the δ Scuti instability strip has recently emerged as a result of Kepler observations. The majority of stars within the instability strip do not pulsate and practically all δ Scuti stars contain low ...
Luis A. Balona
doaj +1 more source
TESS Observations of the Pleiades Cluster: A Nursery for δ Scuti Stars
The Astrophysical Journal Letters, 2023 We studied 89 A- and F-type members of the Pleiades open cluster, including five escaped members. We measured projected rotational velocities ( $v\sin i$ ) for 49 stars and confirmed that stellar rotation causes a broadening of the main sequence in the ...
Timothy R. Bedding +10 more
doaj +1 more source
Vibration prediction and analysis of strip rolling mill based on XGBoost and Bayesian optimization
Complex & Intelligent Systems, 2022 The stable operation of strip rolling mill is the key factor to ensure the stability of product quality. The design capability of existing domestic imported and self-developed strip rolling mills cannot be fully developed, and the frequent occurrence of ...
Yang Zhang +3 more
doaj +1 more source
Strip lateral position control using electromagnets in continuous processing line
Mechanical Engineering Journal, 2015 In continuous metal strip processing lines, such as pickling, annealing and surface treatment lines, lateral instability of strips is a common problem. Strip lateral movement has a bad influence on productivity of the processing lines.
Yusuke ISHIGAKI, Yoshiaki NISHINA
doaj +1 more source
Research on Evaluation Index and Application of Rockburst Risk in Deep Strip Mining
Shock and Vibration, 2020 The practice shows that deep strip mining induces rockburst disaster easily. Accurately evaluating rockburst risk of the strip coal pillar is of great significance for ensuring the safety of deep strip mining.
Bangyou Jiang +5 more
doaj +1 more source
Moving Through The Instability Strip [PDF]
International Astronomical Union Colloquium, 1993 The purpose: To look at period changes in pulsating variables from the point of view of stellar evolution. Is there evidence of systematic, slow changes that might be caused by the changes in mean density during passage across the Instability Strip?The data: O – C diagrams for 67 RR Lyrae stars and Cepheids by student assistants at the Maria Mitchell ...
openaire +1 more source