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pro vyhledávání: '"Crawford, Courtney L"'
Autor:
Crawford, Courtney L., Nikultsev, Nikita, Clayton, Geoffrey C., Tisserand, Patrick, Soon, Jamie, Pedersen, May G.
Hydrogen-deficient Carbon (HdC) stars are rare, low-mass, chemically peculiar, supergiant variables believed to be formed by a double white dwarf (DWD) merger, specifically of a Carbon/Oxygen- (CO-) and a Helium-white dwarf (He-WD). They consist of t
Externí odkaz:
http://arxiv.org/abs/2408.09700
Autor:
Li, Yaguang, Bedding, Timothy R., Huber, Daniel, Stello, Dennis, van Saders, Jennifer, Zhou, Yixiao, Crawford, Courtney L., Joyce, Meridith, Li, Tanda, Murphy, Simon J., Sreenivas, K. R.
Asteroseismic modelling is a powerful way to derive stellar properties. However, the derived quantities are limited by built-in assumptions used in stellar models. This work presents a detailed characterisation of stellar model uncertainties in aster
Externí odkaz:
http://arxiv.org/abs/2407.09967
Autor:
Crawford, Courtney L., Bedding, Timothy R., Li, Yaguang, Stello, Dennis, Huber, Daniel, Yu, Jie, Sreenivas, K. R., Li, Tanda, Kerrison, Emily F.
When low- and intermediate-mass stars evolve off the main sequence, they expand and cool into the red giant stages of evolution, which include those associated with shell H burning (the red giant branch), core He burning (the red clump), and shell He
Externí odkaz:
http://arxiv.org/abs/2402.07380
Autor:
Sreenivas, K. R., Bedding, Timothy R., Li, Yaguang, Huber, Daniel, Crawford, Courtney L., Stello, Dennis, Yu, Jie
The importance of numax (the frequency of maximum oscillation power) for asteroseismology has been demonstrated widely in the previous decade, especially for red giants. With the large amount of photometric data from CoRoT, Kepler and TESS, several a
Externí odkaz:
http://arxiv.org/abs/2401.17557
Autor:
Crawford, Courtney L., Tisserand, Patrick, Clayton, Geoffrey C., Soon, Jamie, Bessell, Mike, Wood, Peter, Garcia-Hernandez, D. A., Ruiter, Ashley J., Seitenzahl, Ivo R.
Stellar spectral classification has been highly useful in the study of stars. While there is a currently accepted spectral classification system for carbon stars, the subset of Hydrogen-deficient Carbon (HdC) stars has not been well described by such
Externí odkaz:
http://arxiv.org/abs/2210.04416
Publikováno v:
A&A 667, A85 (2022)
Context: R Coronae Borealis (RCB) variables and their non-variable counterparts, the dustless Hydrogen-Deficient Carbon (dLHdC) stars have been known to exhibit enhanced s-processed material on their surfaces, especially Sr, Y, and Ba. No comprehensi
Externí odkaz:
http://arxiv.org/abs/2112.07689
Autor:
Munson, Bradley, Chatzopoulos, Emmanouil, Frank, Juhan, Clayton, Geoffrey C., Crawford, Courtney L., Denissenkov, Pavel A., Herwig, Falk
R Coronae Borealis (RCB) stars are rare hydrogen-deficient carbon-rich variable supergiants thought to be the result of dynamically unstable white dwarf mergers. We attempt to model RCBs through all the relevant timescales by simulating a merger even
Externí odkaz:
http://arxiv.org/abs/2103.01741
Autor:
Crawford, Courtney L., Clayton, Geoffrey C., Munson, Bradley, Chatzopoulos, Emmanouil, Frank, Juhan
Publikováno v:
MNRAS, Volume 498, Issue 2, October 2020, Pages 2912-2924
The R Coronae Borealis (RCB) stars are extremely hydrogen-deficient carbon stars which produce large amounts of dust, causing sudden deep declines in brightness. They are believed to be formed primarily through white dwarf mergers. In this paper, we
Externí odkaz:
http://arxiv.org/abs/2007.03076
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We use 156 044 white dwarf candidates with $\geq5\sigma$ significant parallax measurements from the Gaia mission to measure the velocity dispersion of the Galactic disc; $(\sigma_U,\sigma_V,\sigma_W) = (30.8, 23.9, 20.0)$ km s$^{-1}$. We identify 142
Externí odkaz:
http://arxiv.org/abs/1810.03536