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A formation timescale of the Galactic halo from Mg isotopes in dwarf stars
Marilia Carlos, Amanda I. Karakas, Judith G. Cohen +2
We determine magnesium isotopic abundances of metal poor dwarf stars from the galactic halo, to shed light on the onset of asymptotic giant branch (AGB) star nucleossynthesis in th…
Serendipitous discovery of the faint solar twin Inti 1
Jhon Yana Galarza, Jorge Meléndez, Judith G. Cohen
Methods. We determine the atmospheric parameters and differential abundances using high-resolution (), high signal-to-noise (S/N 110 - 240 per pixel) Ke…
Lithium-Rich Giants in Globular Clusters
Evan N. Kirby, Puragra Guhathakurta, Andrew J. Zhang +5
Although red giants deplete lithium on their surfaces, some giants are Li-rich. Intermediate-mass asymptotic giant branch (AGB) stars can generate Li through the Cameron-Fowler con…
The Origin of HVS17, an Unbound Main Sequence B Star at 50 kpc
Warren R. Brown, Judith G. Cohen, Margaret J. Geller +1
We analyze Keck ESI spectroscopy of HVS17, a B-type star traveling with a Galactic rest frame radial velocity of +445 km/s in the outer halo of the Milky Way. HVS17 has the project…
Metal Abundances, Radial Velocities and other Physical Characteristics for the RR Lyrae Stars in the Kepler Field
James M. Nemec, Judith G. Cohen, Vincenzo Ripepi +5
Spectroscopic iron-to-hydrogen ratios, radial velocities, atmospheric parameters, and new photometric analyses are presented for 41 RR Lyrae stars (and one probable high-amplitude…
The remarkable solar twin HIP 56948: a prime target in the quest for other Earths
Jorge Melendez, Maria Bergemann, Judith G. Cohen +8
We study HIP 56948, the best solar twin known to date, to determine with an unparalleled precision how similar is to the Sun in its physical properties, chemical composition and pl…