147 citations · 600 across the 10 of their papers we have counts for
10 papers · 1 filter
Oxygen abundance of open cluster dwarfs
Z. -X. Shen, X. -W. Liu, H. -W. Zhang +2
We present oxygen abundances of dwarfs in the young open cluster IC 4665 deduced from the OI 7774 triplet lines and of dwarfs in the open cluster Pleiades derived from the [OI]…
Confirmation of Errors in Hipparcos Parallaxes from HST/FGS Astrometry of the Pleiades
David R. Soderblom, Ed Nelan, G. Fritz Benedict +4
We present absolute trigonometric parallaxes and relative proper motions for three members of the Pleiades star cluster, obtained with HST's Fine Guidance Sensor 1r, a white-light…
Lick Northern Proper Motion Program. III. Lick NPM2 Catalog
Robert B. Hanson, Arnold R. Klemola, Burton F. Jones +1
The Lick Northern Proper Motion (NPM) program, a two-epoch (1947-1988) photographic survey of the northern two-thirds of the sky (Dec. > -23 deg), has measured absolute proper moti…
Chandra X-ray observations of Young Clusters II. Orion Flanking Fields Data
Solange V. Ramirez, Luisa Rebull, John Stauffer +7
We present results of Chandra observations of two flanking fields (FF) in Orion, outside the Orion Nebula Cluster (ONC). The observations were taken with the ACIS-I camera with an…
Chandra X-ray observations of Young Clusters I. NGC2264 Data
Solange V. Ramirez, Luisa Rebull, John Stauffer +7
We present results of a Chandra observation of a field in NGC 2264. The observations were taken with the ACIS-I camera with an exposure time of 48.1 ks. We present a catalog of 263…
Why are the K dwarfs in the Pleiades so Blue?
John R. Stauffer, Burton F. Jones, Dana Backman +5
The K dwarfs in the Pleiades fall nearly one half magnitude below a main sequence isochrone when plotted in a color-magnitude diagram utilizing V magnitude as the luminosity index…
Rotational Studies of Late-Type Stars. VII. M34 (NGC 1039) and the Evolution of Angular Momentum and Activity in Young Solar-Type Stars
David R. Soderblom, Burton F. Jones, Debra Fischer
We analyze Keck Hires observations of rotation in F, G, and K dwarf members of the open cluster M34 (NGC 1039), which is 250 Myr old, and we compare them to the Pleiades, Hyades, a…
Rotational velocities of low-mass stars in the Pleiades and Hyades
Donald M. Terndrup, John R. Stauffer, Marc H. Pinsonneault +5
We have obtained high-resolution spectra of 89 M dwarf members of the Pleiades and Hyades and have derived radial velocities, H-alpha equivalent widths, and spectroscopic rotationa…
The Problem of Hipparcos Distances to Open Clusters. II. Constraints from Nearby Field Stars
David R. Soderblom, Jeremy R. King, Robert B. Hanson +4
This paper examines the discrepancy between distances to nearby open clusters as determined by parallaxes from Hipparcos compared to traditional main sequence fitting. The biggest…
The Distance to the Hyades Cluster Based on HST Fine Guidance Sensor Parallaxes
W. F. van Altena
Trigonometric parallax observations made with the Hubble Space Telescope's Fine Guidance Sensor #3 (HST FGS) of seven Hyades Cluster members in six fields of view have been analyze…