OBSERVATIONAL CONSTRAINTS ON FIRST-STAR NUCLEOSYNTHESIS. I. EVIDENCE FOR MULTIPLE PROGENITORS OF CEMP-NO STARS [PDF]
, 2016 We investigate anew the distribution of absolute carbon abundance, $A$(C) $= \log\,\epsilon $(C), for carbon-enhanced metal-poor (CEMP) stars in the halo of the Milky Way, based on high-resolution spectroscopic data for a total sample of 305 CEMP stars ...
Jinmi Yoon +8 more
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Multiple Stellar Populations in Asymptotic Giant Branch Stars of Galactic Globular Clusters [PDF]
, 2021 Multiple stellar populations (MPs) are a distinct characteristic of globular clusters (GCs). Their general properties have been widely studied among main-sequence, red giant branch (RGB), and horizontal branch (HB) stars, but a common framework is still ...
E. P. Lagioia +10 more
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Spectroscopic Orbits of Subsystems in Multiple Stars. X (Summary) [PDF]
The Astronomical Journal, 2023 Results of a large program of spectroscopic monitoring of nearby solar-type stellar hierarchical systems using the CHIRON echelle spectrograph at the 1.5 m telescope are summarized.
Andrei Tokovinin
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Dynamical investigations of the multiple stars
Open Astronomy, 2017 Two multiple stars - the quadruple star - Bootis (ADS 9173) and the triple star T Taury were investigated. The visual double star - Bootiswas studied on the basis of the Pulkovo 26-inch refractor observations 1982-2013.
Kiyaeva Olga V., Zhuchkov Roman Ya.
doaj +2 more sources
Spectroscopic Orbits of Subsystems in Multiple Stars. IX [PDF]
The Astronomical Journal, 2023 New spectroscopic orbits of inner subsystems in 14 hierarchies are determined from long-term monitoring with the optical echelle spectrometer, CHIRON.
Andrei Tokovinin
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Multiple views of magnetism in cool stars [PDF]
, 2012 Magnetic fields are regarded as a crucial element for our understanding of stellar physics. They can be studied with a variety of methods which provide complementary - and sometimes contradictory - information about the structure, strength and dynamics ...
J. Morin +11 more
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Radial oscillations and stability of multiple-fluid compact stars [PDF]
, 2020 I derive a system of pulsation equations for compact stars made up of an arbitrary number of perfect fluids that can be used to study radial oscillations and stability with respect to small perturbations.
Ben Kain
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Ground‐Layer Wave Front Reconstruction from Multiple Natural Guide Stars [PDF]
, 2007 Observational tests of ground layer wavefront recovery have been made in open loop using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona.
Christoph Baranec +5 more
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Complete ejection of OB stars from very young star clusters and the formation of multiple populations [PDF]
Monthly notices of the Royal Astronomical Society, 2018 Recently, three stellar sequences separated in age by about 1 Myr were discovered in the Orion Nebula Cluster (ONC; Beccari et al. 2017). Kroupa et al. (2018) suggest that such small dense subpopulations eject all their OB stars via the decay of unstable
Long Wang +2 more
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Spectroscopic Orbits of Subsystems in Multiple Stars. XI
The Astronomical JournalAdding to the large radial velocity survey of nearby solar-type stars (summary in Tokovinin, 2023a), spectroscopic orbits are determined for four hierarchical systems: HIP 49442 (inner and outer periods of 164.55 days and 34 yr, respectively), HIP 55691 (
Andrei Tokovinin
doaj +2 more sources