THE ASTROPHYSICAL JOURNAL LETTERS CONTENTS OF VOLUME 381, PART 2 1991 NOVEMBER 1, Number 1 Page Fiche THE EVOLUTION OF THE DIFFUSE COSMIC ULTRAVIOLET BACKGROUND CONSTRAINED BY HUBBLE SPACE Ll 194-A9 TELESCOPE OBSERVATIONS OF 3C 273 Satoru Ikeuchi & Edwin L. Turner THE SYSTEMIC REDSHIFT OF THE QUASAR 1331+ 170 R. F. Carswell, C. M. Mountain, D. J. Robertson, S. M. Beard, A. R. Glendinning, D. C. Laird, L. C. Lawrence, D. Montgomery, G. Pentland, D. A. Pickup, I. A. Smith, J. A. Bailey, A. Bridger, M. M. Casali, T. R. Geballe, P- Puxley, M. G. Smith, G. S. Wright, S. K. Ramsay, A. C. Baker, B. R. Espey, & M. J. Ward DISCOVERY OF A LOW-REDSHIFT ULTRALUMINOUS “E+A” GALAXY William R. Oegerle, John M. Hill, & John G. Hoessel THE H 1 CONTENT OF THE LOCAL GROUP DWARF (SPHEROIDAL OR IRREGULAR?) GALAXY PHOENIX Claude Carignan, Serge Demers, & Stéphanie Cété INTERSTELLAR ENVIRONMENTS PROBED BY Ca 1 ABSORPTION AND THE EFFECTS OF DENSITY-DEPENDENT DEPLETIONS Jason A. Cardelli, S. R. Federman, & V. V. Smith OUTFLOW HYDRODYNAMICS IN THE ECLIPSING MILLISECOND PULSAR BINARIES PSR 195+7 2 0 194-C13 AND PSR 1744-—24A Marco Tavani & Leigh Brookshaw SPECTROSCOPY OF Z CAMELOPARDALIS IN OUTBURST WITH THE HOPKINS ULTRAVIOLET TELESCOPE Knox S. Long, William P. Blair, Arthur F. Davidsen, Charles W. Bowers, W. Van Dyke Dixon, Samuel T. Durrance, Paul D. Feldman, Richard C. Henry, Gerard A. Kriss, Jeffrey W. Kruk, H. Warren Moos, Olaf Vancura, Henry C. Ferguson, & Randy A. Kimble MAGNETOACOUSTIC HEATING OF THE SOLAR CHROMOSPHERE 194-D12 Joseph M. Davila & S. M. Chitre NONFACULAR SOLAR LUMINOSITY VARIATIONS L35 J. R. Kuhn & K. G. Libbrecht INSTRUCTIONS TO AUTHORS OF LETTERS Inside Back Cover 1991 NOVEMBER 10, Number 2 MICROLENSING AND THE STRUCTURE OF ACTIVE GALACTIC NUCLEUS ACCRETION DISKS Kevin P. Rauch & Roger D. Blandford THE GALACTIC CENTER RADIO SOURCE SHINES BELOW THE COMPTON LIMIT C. R. Gwinn, R. M. Danen, J. Middleditch, L. M. Ozernoy, & T. Kh. Tran SOFT X-RAY PULSES FROM NEUTRON STAR GLITCHES Kenneth A. Van Riper, Richard I. Epstein, & Guy S. Miller CONTENTS DETECTION OF THE HELIUM FLASH GAP IN THE INTEGRATED (U — B) VERSUS (B — V) DIAGRAM FOR 624 LARGE MAGELLANIC CLOUD CLUSTERS E. Bica, J. J. Clarida, H. Dottori, J. F. C. Santos, Jr, & A. Piatti NEAR-INFRARED OBSERVATIONS OF THE z ~ 2.3 JRAS SOURCE FSC 10214+ 4724 B T. Soifer, G. Neugebauer, J. R. Graham, K. Matthews, J. M. Mazzarella, C. J. Lonsdale, M. Rowan-Robinson, T. Broadhurst, A. Lawrence, & R. McMahon N m LINE EMISSION IN PLANETARY NEBULAE: NOT BOWEN FLUORESCENCE S. O. Kastner & A. K. Bhatia INVERSE-COMPTON GAMMA-RAY EMISSION FROM CHAOTIC, EARLY-TYPE STELLAR WINDS AND ITS DETECTABILITY BY GAMMA RAY OBSERVATORY Wan Chen & Richard L. White METAL OPACITIES AND CONVECTIVE CORE OVERSHOOTING IN POPULATION I STARS Richard B. Stothers & Chao-wen Chin MASSES OF RRd VARIABLES USING LIVERMORE OPAL OPACITIES Arthur N. Cox INSTRUCTIONS TO AUTHORS OF LETTERS Inside Back Cover