Zobrazeno 1 - 10
of 159
pro vyhledávání: '"King, Jeremy R."'
Autor:
Boesgaard, Ann Merchant, Deliyannis, Michael G. Lum. Constantine P., King, Jeremy R., Pinsonneault, Marc H., Somers, Garrett
Dramatic deficiencies of Li in the mid-F dwarf stars of the Hyades cluster were discovered by Boesgaard & Tripicco. Boesgaard & King discovered corresponding, but smaller, deficiencies in Be in the same narrow temperature region in the Hyades. With t
Externí odkaz:
http://arxiv.org/abs/1606.07117
Autor:
Schuler, Simon C., Vaz, Zachary A., Santrich, Orlando J. Katime, Cunha, Katia, Smith, Verne V., King, Jeremy R., Teske, Johanna K., Ghezzi, Luan, Howell, Steve B., Isaacson, Howard
We present newly derived stellar parameters and the detailed abundances of 19 elements of seven stars with small planets discovered by NASA's Kepler Mission. Each star save one has at least one planet with a radius <= 1.6 R_Earth, suggesting a primar
Externí odkaz:
http://arxiv.org/abs/1511.00934
The low [alpha/Fe] ratio in the metal-poor ([Fe/H]= -1.50) common proper motion pair HD 134439 and HD 134440 has been variously attributed to chemical evolution in an extragalactic environment with an irregular star formation history, planetessimal a
Externí odkaz:
http://arxiv.org/abs/1410.8646
Recent reanalyses of HIPPARCOS parallax data confirm a previously noted discrepancy with the Pleiades distance modulus estimated from main-sequence fitting in the color-magnitude diagram. One proposed explanation of this distance modulus discrepancy
Externí odkaz:
http://arxiv.org/abs/1309.1540
As a test of rotationally-induced mixing causing the well-known Li dip in older mid-F dwarfs in the local Galactic disk, we utilize high-resolution and -S/N Keck/HIRESspectroscopy to measure the Li abundance in the components of the1 Gyr, [Fe/H]=-0.1
Externí odkaz:
http://arxiv.org/abs/1306.0644
Autor:
Schaeuble, Marc, King, Jeremy R.
We provide *lambda*6708 Li 1 measurements in 37 metal-poor stars, most of which are poorly-studied or have no previous measurements, from high-resolution and high-S/N spectroscopy obtained with the McDonald Observatory 2.1m and 2.7m telescopes. The t
Externí odkaz:
http://arxiv.org/abs/1201.0835
We utilize spectroscopically derived model atmosphere parameters and the \ion{Li}{1} $\lambda6104$ subordinate line and the $\lambda6708$ doublet to derive lithium abundances for 12 members of the Upper-Centaurus Lupus (UCL) and Lower-Centaurus Crux
Externí odkaz:
http://arxiv.org/abs/1110.6425
Autor:
Schuler, Simon C., Flateau, Davin, Cunha, Katia, King, Jeremy R., Ghezzi, Luan, Smith, Verne V.
Precise abundances of 18 elements have been derived for ten stars known to host giant planets from high signal-to-noise ratio, high-resolution echelle spectroscopy. Internal uncertainties in the derived abundances are typically <=0.05 dex. The stars
Externí odkaz:
http://arxiv.org/abs/1103.0757
Autor:
Bubar, Eric J., King, Jeremy R.
The concept of kinematic assemblages evolving from dispersed stellar clusters has remained contentious since Eggen's initial formulation of moving groups in the 1960's. With high quality parallaxes from the Hipparcos space astrometry mission, distanc
Externí odkaz:
http://arxiv.org/abs/1005.1205
Autor:
Bubar, Eric J., King, Jeremy R., Soderblom, David R., Deliyannis, Constantine P., Boesgaard, Ann M.
Publikováno v:
Astron.J.134:2328-2339,2007
We use high-signal-to-noise ($\sim$150-450), high resolution ($R{\sim}45,000$) Keck HIRES spectroscopy of 13 candidate post T Tauri stars to derive basic physical parameters, lithium abundances and radial velocities. We place our stars in the M$_v$-T
Externí odkaz:
http://arxiv.org/abs/0708.3089