Galactic calibration of the tip of the red giant branch
Sign Up to like & getrecommendations! Published in 2019 at "Publications of the Astronomical Society of Australia"
DOI: 10.1017/pasa.2018.46
Abstract: Abstract Indications from Gaia data release 2 are that the tip of the red giant branch (a population II standard candle related to the helium flash in low mass stars) is close to –4 in… read more here.
Keywords: red giant; giant branch; calibration tip; tip red ... See more keywords
Automated approach to measure stellar inclinations: validation through large-scale measurements on the red giant branch
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DOI: 10.1051/0004-6361/202039285
Abstract: Measuring stellar inclinations is fundamental to understand planetary formation and dynamics as well as physical conditions during star formation. Oscillation spectra of red giant stars exhibit mixed modes that have both a gravity component from… read more here.
Keywords: giant branch; measure stellar; stellar inclinations; red giant ... See more keywords
Mirror principle and the red-giant bump: the battle of entropy in low-mass stars
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DOI: 10.1093/mnras/staa176
Abstract: The evolution of low-mass stars into red giants is still poorly understood. During this evolution the core of the star contracts and, simultaneously, the envelope expands -- a process known as the `mirror'. Additionally, there… read more here.
Keywords: mass stars; luminosity; red giant; low mass ... See more keywords
Nature vs. Nurture: Distinguishing Effects from Stellar Processing and Chemical Evolution on Carbon and Nitrogen in Red Giant Stars
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DOI: 10.1093/mnras/stae820
Abstract: The surface [C/N] ratios of evolved giants are strongly affected by the first dredge-up (FDU) of nuclear-processed material from stellar cores. C and N also have distinct nucleosynthetic origins and serve as diagnostics of mixing… read more here.
Keywords: distinguishing effects; mass; nature nurture; nurture distinguishing ... See more keywords
Jet–red giant interactions as a source of extragalactic neutrinos: Insights from KM3-230213A
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DOI: 10.1093/mnras/staf1929
Abstract: The production sites of high-energy astrophysical neutrinos remain uncertain, though growing evidence suggests a connection to relativistic jets in active galactic nuclei (AGN). We present a detailed analysis of the recent PeV neutrino event KM3−230213A… read more here.
Keywords: km3 230213a; interactions source; giant interactions; red giant ... See more keywords
Life after death: Europa in the evolving Habitable Zone of a Red Sun
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DOI: 10.1093/mnras/staf794
Abstract: Most stars end their main-sequence (MS) lives by evolving through the red-giant and asymptotic-giant branches before ending as a quiescent, stable white dwarf. Therefore, it is imperative to model the post-MS as it relates to… read more here.
Keywords: zone red; habitable zone; life; zone ... See more keywords
KOI-3890: a high-mass-ratio asteroseismic red giant+M-dwarf eclipsing binary undergoing heartbeat tidal interactions
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz1185
Abstract: KOI-3890 is a highly eccentric, 153-d period eclipsing, single-lined spectroscopic binary system containing a red giant star showing solar-like oscillations alongside tidal interactions. The combination of transit photometry, radial velocity observations, and asteroseismology has enabled… read more here.
Keywords: system; asteroseismology; mass; dwarf ... See more keywords
Common envelope evolution on a moving mesh
Sign Up to like & getrecommendations! Published in 2019 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stz1219
Abstract: We outline the methodology of simulating common envelope evolution (CEE) with the moving-mesh code manga. We extend manga to include multiple time-steps. This provides substantial speedups for problems with large dynamic range. We describe the… read more here.
Keywords: common envelope; envelope; red giant; envelope evolution ... See more keywords