Zobrazeno 1 - 10
of 105
pro vyhledávání: '"COWLEY, CHARLES"'
Autor:
Cowley, Charles R., Stencel, Robert E.
We compare and contrast the kinematics of various classes of stars, both normal (with M-K spectral types) and peculiar. Numerous plots show the differences in spatial and velocity distributions as well as distributions in kinetic energy vs. angular m
Externí odkaz:
http://arxiv.org/abs/2408.06161
Autor:
Cowley, Charles R., Stencel, Robert E.
Publikováno v:
2023 RNAAS 7, issue 5, 88
Properties of solar twins reported by Lehmann et al. (2023) at kiloparsec distances from the local standard of rest (LSR) are compared to solar twins within 100 pc of the Sun. These have velocity distributions closely similar to those of the nearby t
Externí odkaz:
http://arxiv.org/abs/2305.17486
Autor:
Cowley, Charles C., Stencel, Robert E.
Sun-like dwarf stars in the solar neighborhood reflect ages, an ``average'' chemical evolution, and departures from that average. We show the chemical, and kinematic properties of four groups of Sunlike dwarfs form a continuum related to age. We plot
Externí odkaz:
http://arxiv.org/abs/2303.17673
Autor:
Cowley, Charles R., Yüce, Kutluay
Galactic chemical evolution (GCE), solar analogues or twins, and peculiarities of the solar composition with respect to the twins are inextricably related. We examine GCE parameters from the literature and present newly derived values using a quadrat
Externí odkaz:
http://arxiv.org/abs/2203.05592
The literature on precision differential abundances (PDAs) in stars is extensive. Surveys include sun-like stars in the solar neighborhood, binary systems, and Galactic clusters. Numerous references as well as a discussion of relevant mechanisms may
Externí odkaz:
http://arxiv.org/abs/2101.10295
Bedell et al. (2018) give precision differential abundances for 79 mostly G-dwarf stars. We correct these abundances for Galactic chemical evolution in a manner similar to that used by these authors but with parameters derived from linear fits to plo
Externí odkaz:
http://arxiv.org/abs/2003.14336
Autor:
Cowley, Charles R., Ayres, Thomas R., Castelli, Fiorella, Gulliver, Austin F., Monier, Richard, Wahlgren, Glenn
We determine abundances or upper limits for all of the 55 stable elements from copper to uranium for the A1 Vm star Sirius. The purpose of the study is to assemble the most complete picture of elemental abundances with the hope of revealing the chemi
Externí odkaz:
http://arxiv.org/abs/1605.08399
Autor:
Cowley, Charles, Hubrig, Swetlana
We present a preliminary abundance analysis of the isolated Herbig Ae star PDS2 (CD -53 251, 2MASS J01174349-5233307). Our adopted model has Teff = 6500K, log(g) = 3.5. It is likely that PDS2 belongs to the class of young stars with abundances resemb
Externí odkaz:
http://arxiv.org/abs/1310.2596
Autor:
Cowley, Charles R.
Concluding remarks following the international conference "Putting A Stars into Context," 3-7 June 2013 in Moscow. We argue that it is time for theoretical efforts to consider exogenous processes such as mass transfer or circumstellar infall as well
Externí odkaz:
http://arxiv.org/abs/1310.0327