Results 11 to 20 of about 4,112,115 (294)
Surface rotation of Kepler red giant stars [PDF]
Astronomy & Astrophysics, 2017 Kepler allows the measurement of starspot variability in a large sample of field red giants for the first time. With a new method that combines autocorrelation and wavelet decomposition, we measure 361 rotation periods from the full set of 17 377 oscillating red giants in our sample.
Ceillier, T. +9 more
openaire +8 more sources
Observations of red‐giant variable stars by Aboriginal Australians
The Australian Journal of Anthropology, 2017 Aboriginal Australians carefully observe the properties and positions of stars, including both overt and subtle changes in their brightness, for subsistence and social application. These observations are encoded in oral tradition. I examine two Aboriginal oral traditions from South Australia that describe the periodic changing brightness in three ...
Duane W. Hamacher, Hamacher, Duane W.
openaire +5 more sources
An abundance study of red-giant-branch stars in the Hercules dwarf spheroidal galaxy [PDF]
, 2010 Context. Dwarf spheroidal galaxies are some of the most metal-poor, and least luminous objects known. Detailed elemental abundance analysis of stars in these faint objects is key to our understanding of star formation and chemical enrichment in the early
K. Eriksson (7614386) +5 more
core +7 more sources
Evolutionary states of red-giant stars from grid-based modelling
EPJ Web of Conferences, 2017 From its surface properties it can be difficult to determine whether a red-giant star is in its heliumcore-burning phase or only burning hydrogen in a shell around an inert helium core.
Hekker Saskia +3 more
doaj +2 more sources
The GALAH survey : a census of lithium-rich giant stars [PDF]
, 2021 We investigate the properties of 1262 red giant stars with high photospheric abundances of lithium observed by the GALAH and K2-HERMES surveys, and discuss them in the context of proposed mechanisms for lithium enrichment and redepletion in giant stars ...
Buder, Sven +23 more
core +1 more source
Estimation of Distances to the Red Giant Stars [PDF]
Estimation of Distances to the Red Giant Stars[Abstract] Based on the Principal Component Analysis and Oort's Galactic rotation model, the distances to the red giant stars are estimated. The 157 red giant stars are devided into two groups, then the distances are estimated as log d(Kpc)=0.471z_2+0.241 for Group 1 and log d(Kpc)=0.446z_2+0.532 for Group 2, where z_2 is the principal component ...
ウンノ, ワサブロウ +5 more
openaire +2 more sources
Red Giants Search Method Based on Convolutional Neural Networks
The Astronomical Journal, 2023 Red giants play a crucial role in astronomical exploration. However, the current search for these stars heavily relies on spectrum analysis, making it a cumbersome process.
Hao Yuan +7 more
doaj +1 more source
Update on the APOKASC analysis of Red Giants
EPJ Web of Conferences, 2017 APOKASC is a collaboration between APOGEE's spectroscopic survey in the near IR at Apache Point (SDSS) and Kepler Asteroseismic Science Consortium (KASC) for the study of red-giant stars.
Elsworth Yvonne
doaj +1 more source
Four new planets around giant stars and the mass-metallicity correlation of planet-hosting stars [PDF]
, 2016 Context. Exoplanet searches have revealed interesting correlations between the stellar properties and the occurrence rate of planets. In particular, different independent surveys have demonstrated that giant planets are preferentially found around metal ...
R. A. Wittenmyer +42 more
core +1 more source
Rotation in sdB stars as revealed by stellar oscillations
Open Astronomy, 2018 An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdwarf (
Charpinet Stephane +5 more
doaj +1 more source