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Measuring Fundamental Parameters of Substellar Objects. II: Masses and Radii
Subhanjoy Mohanty, Ray Jayawardhana, Gibor Basri
We present mass and radius derivations for a sample of very young, mid- to late M, low-mass stellar and substellar objects in Upper Sco and Taurus. In a previous paper, we determin…
Measuring Fundamental Parameters of Substellar Objects. I: Surface Gravities
Subhanjoy Mohanty, Gibor Basri, Ray Jayawardhana +3
(abridged) We present an analysis of high resolution optical spectra for a sample of very young, mid- to late M, low-mass stellar and substellar objects in Upper Sco and Taurus. Ef…
X-ray Properties of Pre--Main-Sequence Stars in the Orion Nebula Cluster with Known Rotation Periods
Keivan G. Stassun, David R. Ardila, Mary Barsony +2
We re-analyze all archival Chandra/ACIS observations of the Orion Nebula Cluster (ONC) to study the X-ray properties of a large sample of pre--main-sequence (PMS) stars with optica…
Oxygen and Magnesium Abundance in the Ultra-Metal-Poor Giants CS22949-037 and CS29498-043: Challenges in Models of Atmospheres
G. Israelian, N. Shchukina, R. Rebolo +3
We report the results of a non-LTE Fe, O and Mg abundance analysis of the carbon-nitrogen-rich ultra-metal-poor giants CS29498--043 and CS22949--037. The abundance of oxygen has be…