1.9k citations · 3.3k across the 14 of their papers we have counts for
11 papers · 1 filter
Behavior of Sulfur Abundances in Metal-Poor Giants and Dwarfs
M. Takada-Hidai, Y. Takeda, S. Sato +6
LTE and NLTE abundances of sulfur in 6 metal-poor giants and 61 dwarfs (62 dwarfs, including the Sun) were explored in the range of -3 \lsim [Fe/H] \lsim using high-resoluti…
The Deuterium Abundance at z=0.701 towards QSO 1718+4807
David Tytler, Scott Burles, Limin Lu +3
We present constraints on the deuterium to hydrogen ratio (D/H) in the metal-poor gas cloud at redshift towards QSO 1718+4807. We use new Keck spectra in addition to Hubb…
Highly Ionized High Velocity Clouds: Intergalactic Gas in the Local Group or Distant Gas in the Galactic Halo?
Kenneth R. Sembach, Blair D. Savage, Limin Lu +1
We have recently identified several high velocity (V < -100 km/s) clouds in the directions of Mrk 509 and PKS 2155-304 that have unusual ionization properties. The clouds exhibit s…
The HST Quasar Absorption Line Key Project. XIV. The Evolution of Ly-alpha Absorption Lines in the Redshift Interval 0 to 1.5
Ray J. Weymann, Buell T. Jannuzi, Limin Lu +10
We present an analysis of the evolution of the Ly alpha absorption lines in the redshift interval 0.0 to \sim 1.5 based upon a sample of 987 lines identified in the spectra of 63 Q…
The Relationship Between Galaxies and Low Redshift Weak Lyman alpha Absorbers in the Directions of H1821+643 and PG1116+215
Todd M. Tripp, Blair D. Savage, Limin Lu
To study the nature of low z Lya absorbers in the spectra of QSOs, we have obtained high signal-to-noise UV spectra of H 1821+643 (z = 0.297) and PG 1116+215 (z = 0.177) with the G…
The N/Si Abundance Ratio in Fifteen Damped Lyman-alpha Galaxies: Implications for the Origin of Nitrogen
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow
Galactic chemical evolution model calculations indicate that there should be considerable scatter in the observed N/O ratios at a fixed metallicity (O/H) for galaxies with very low…
The Metallicity and Dust Content of HVC 287.5+22.5+240: Evidence for a Magellanic Clouds Origin
Limin Lu, Blair D. Savage, Kenneth R. Sembach +3
We estimate the abundances of S and Fe in the high velocity cloud HVC 287.5+22.5+240, which has a velocity of +240 km/s with respect to the local standard of rest and is in the Gal…
Echelle Spectroscopy of QSO Absorption Line Systems with Metals in the Direction of HS 1700+6416
Todd M. Tripp, Limin Lu, Blair D. Savage
We present a high signal-to-noise high resolution spectrum of the radio-quiet QSO HS1700+6416 (z = 2.72). Analysis of the absorption line systems with metals yields the following r…
Evidence for Rotation in the Galaxy at z=3.15 Responsible for a Damped Lyman-alpha Absorption System in the Spectrum of Q2233+1310
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow
Proof of the existence of a significant population of normal disk galaxies at redshift z>2 would have profound implications for theories of structure formation and evolution. We pr…
Abundances at High Redshifts: the Chemical Enrichment History of Damped Lyman-alpha Galaxies
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow
Damped Lyman-alpha absorption systems found in the spectra of high redshift quasars are believed to trace the interstellar gas in high redshift galaxies. In this paper, we study th…
The Lyman-alpha Forest at z~4: Keck HIRES Observations of Q 0000-26
Limin Lu, Wallace L. W. Sargent, Donna S. Womble +1
This paper describes a study of the Lyman-alpha forest absorption clouds along the quasar sightline Q0000-26 (zem=4.1). The spectrum was obtained with the High Resolution Spectrome…