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THE ASTROPHYSICAL JOURNAL Founded in 1895 by George E. Hale and James E. Keeler HELMUT A. ABT Editor-in-Chief Kitt Peak National Observatory Scientific Editors GREGORY D. BOTHUN GEOFFREY BURBIDGE ANNE P. COWLEY BERNHARD M. HAISCH University of Oregon University of California, Arizona State University Solar and Astrophysics Lab., San Diego Lockheed Martin STEVEN N. SHORE EDWARD M. SION CHRISTOPHER SNEDEN YERVANT TERZIAN Indiana University, Villanova University University of Texas Cornell University South Bend JOHN H. THOMAS VIRGINIA TRIMBLE STEVEN P. WILLNER EDWARD L. WRIGHT University of Rochester University of Maryland and Smithsonian Astrophysical University of California, University of California, Irvine Observatory Los Angeles A. DALGARNO EUGENE H. AVRETT Letters Editor Deputy Letters Editor Center for Astrophysics Center for Astrophysics AAS PUBLICATIONS BOARD ROBERT J. HANISCH (1996-1999), Chairperson Space Telescope Science Institute JAMES J. CONDON (1994-1997) JOHN A. NOUSEK (1994-1997) MOSHE ELITZUR (1995-1998) NRAO, Charlottesville, Virginia Pennsylvania State University University of Kentucky DIMITRI M. MIHALAS (1996-1999) KAREN S. BJORKMAN (1996-1999) SUSAN TEREBEY (1997-2000) University of Illinois University of Toledo California Institate of Technology Publication Manager: JULIE STEFFEN Production Manager: Kim LANGFORD Chief Manuscript Editor: GERALDINE BRADY Manuscript Editors: WALTER G. GuLascorF III, BETH GARRISON, THAD A. Doria, PAUL RUICH, IVAN BRUNETTI, SHARON JENNINGS, MAUREEN E. CALLAHAN, STEPHANIE O. NEVINS, BAHARE RASHIDI, ELIZABETH HUYCK, PETER M. RIVARD, Mary ALICE HINSHAW, AND ELISSA PARK Production Staff: CinDyY GARRETT, EMILY CLARK, SUCHITRA GURURAJ, ABIGAIL C. FACTOR, AND JAMES LAFOREST Tucson Editorial Office: JANICE SEXTON, ALICE PROCHNOW, CANDACE M. HAUSER, CHEYENNE ROSS, AND RACHEL WILLIAMS VOLUME 489, PART 1 1997 NOVEMBER 1 AND NOVEMBER 10 PUBLISHED BY THE UNIVERSITY OF CHICAGO PRESS FOR THE AMERICAN ASTRONOMICAL SOCIETY © 1997 BY THE AMERICAN ASTRONOMICAL SOCIETY. ALL RIGHTS RESERVED. PUBLISHED THREE TIMES A MONTH COMPOSED BY SANTYPE INTERNATIONAL LIMITED, SALISBURY, ENGLAND PRINTED BY CAPITAL CITY PRESS, INC. MONTPELIER, VERMONT, U.S.A. THE ASTROPHYSICAL JOURNAL CONTENTS OF VOLUME 489, PART 1 1997 NOVEMBER 1, Number 1 GRAVITATIONAL MAGNIFICATION OF THE COSMIC MICROWAVE BACKGROUND R. Benton Metcalf & Joseph Silk THE OPACITY OF THE Lya FOREST AND IMPLICATIONS FOR Q, AND THE IONIZING BACKGROUND Michael Raunch, Jordi Miralda-Escudé, Wallace L. W. Sargent, Tom A. Barlow, David H. Weinberg, Lars Hernquist, Neal Katz, Renyue Cen, & Jeremiah P. Ostriker ANALYSIS OF TIME DELAYS IN THE GRAVITATIONAL LENS PG 1115+080 Rennan Barkana THE LOCAL SPACE DENSITY OF DWARF GALAXIES Jon Loveday REDSHIFT-SPACE DISTORTIONS AND THE REAL-SPACE CLUSTERING OF DIFFERENT GALAXY TYPES Luigi Guzzo, Michael A. Strauss, Karl B. Fisher, Riccardo Giovanelli, & Martha P. Haynes BENDING INSTABILITIES IN HOMOGENEOUS OBLATE SPHEROIDAL GALAXY MODELS Christopher M. Jessop, Martin J. Duncan, & Harold F. Levison INTERSTELLAR ABUNDANCE GRADIENTS IN NGC 2403: COMPARISON TO M33 D. R. Garnett, G. A. Shields, E. D. Skillman, S. P. Sagan, & R. J. Dufour EVIDENCE FOR A PRECESSING ACCRETION DISK IN THE NUCLEUS OF NGC 1097 Thaisa Storchi-Bergmann, Michael Eracleous, Maria Teresa Ruiz, Mario Livio, Andrew S. Wilson, & Alexei V. Filippenko FAR-INFRARED ABUNDANCE MEASUREMENTS IN THE OUTER GALAXY Alexander L. Rudolph, Janet P. Simpson, Michael R. Haas, Edwin F. Erickson, & Michel Fich A SEARCH FOR THE CO-H, DIMER IN THE GALAXY R. J. Allen, L. Loinard, A. R. W. McKellar, & J. Lequeux THE RATE OF THE REACTION BETWEEN C,H AND C,H, AT INTERSTELLAR TEMPERATURES Eric Herbst & David E. Woon MOLECULAR ORBITAL STUDY OF NEUTRAL-NEUTRAL REACTIONS CONCERNING HC,N FORMATION IN INTERSTELLAR SPACE Kaori Fukuzawa & Yoshihiro Osamura MODELS FOR DENSE MOLECULAR CLOUD CORES Steven D. Doty & David A. Neufeld POLARIZATION OBSERVATIONS OF 1720 MHz OH MASERS TOWARD THE THREE SUPERNOVA REMNANTS W28, W44, AND IC 443 M. J. Claussen, D. A. Frail, W. M. Goss, & R. A. Gaume GAMMA-RAY LINE SIGNALS FROM SUPERNOVAE WITHIN 100 Mpc F. X. Timmes & S. E. Woosley VERY HIGH ENERGY OBSERVATIONS OF PSR B1951 +32 R. Srinivasan, P. J. Boyle, J. H. Buckley, D. A. Carter-Lewis, M. Catanese, M. F. Cawley, E. Colombo, D. J. Fegan, J. P. Finley, J. A. Gaidos, J. Bussons Gordo, A. M. Hillas, F. Krennrich, R. C. Lamb, R. W. Lessard, J.M. McEnery, P. Moriarty, J. Quinn, H. J. Rose, F. W. Samuelson, G. Sembroski, T. C. Weekes, C. Wilson, & J. Zweerink THE IDENTIFICATION OF TWO DIFFERENT SPECTRAL TYPES OF PULSES IN GAMMA-RAY BURSTS G. N. Pendleton, W. S. Paciesas, M. S. Briggs, R. D. Preece, R. S. Mallozzi, C. A. Meegan, J. M. Horack, G. J. Fishman, D. L. Band, J. L. Matteson, R. T. Skelton, J. Hakkila, L. A. Ford, C. Kouveliotou, & T. M. Koshut TIME-DEPENDENT ACCRETION BY MAGNETIC YOUNG STELLAR OBJECTS AS A LAUNCHING MECHANISM FOR STELLAR JETS Anthony P. Goodson, Robert M. Winglee, & Karl-Heinz Bohm CONTENTS ADAPTIVE OPTICS INFRARED IMAGING POLARIMETRY AND OPTICAL HST IMAGING OF HUBBLE’S VARIABLE NEBULA (R MONOCEROTIS/NGC 2261): A CLOSE LOOK AT A VERY YOUNG ACTIVE HERBIG Ae/Be STAR L. M. Close, F. Roddier, J. L. Hora, J. E. Graves, M. Northcott, C. Roddier, W. E. Hoffmann, A. Dayal, G. G. Fazio, & L. K. Deutsch ON THE RELATIVE SURFACE DENSITY CHANGE OF THERMALLY UNSTABLE ACCRETION DISKS Xue-Bing Wu BLACK HOLE DISK ACCRETION IN SUPERNOVAE Shin Mineshige, Hideko Nomura, Masahito Hirose, Ken’ichi Nomoto, & Tomoharu Suzuki ADVECTION-DOMINATED FLOWS AROUND BLACK HOLES AND THE X-RAY DELAY IN THE OUTBURST OF GRO J1655—40 J.-M. Hameury, J.-P. Lasota, J. E.M cClintock, & R. Narayan DOUBLE NEUTRON STAR SYSTEMS ANI NATAL NEUTRON STAR KICKS Chris Fryer & Vassiliki Kalogera THE SYMBIOTIC NEUTRON STAR BINARY GX 1+4/V2116 OPHIUCHI Deepto Chakrabarty & Paul Roche SPECTRAL AND TEMPORAL VARIABILITY IN THE X-RAY FLUX OF GS 1124—683, NOVA MUSCAE 1991 Mamoru Takizawa, Tadayasu Dotani, Kazuhisa Mitsuda, Eiji Matsuba, Mina Ogawa, Takashi Aoki, Kazumi Asai, Ken Ebisawa, Kazuo Makishima, Sigenori Miyamoto, Sayuri Iga, Brian Vaughan, Robert E. Rutledge, & Walter H. G. Lewin WARM DISK CORONAE IN CLASSICAL T TAURI STARS John Kwan TRACING THE ENVELOPES AROUND EMBEDDED LOW-MASS YOUNG STELLAR OBJECTS WITH HCO* AND MILLIMETER-CONTINUUM OBSERVATIONS Michiel R. Hogerheijde, Ewine F. van Dishoeck, Geoffrey A. Blake, & Huib Jan van Langevelde HOPKINS ULTRAVIOLET TELESCOPE OBSERVATIONS OF H, EMISSION FROM HH 2 John C. Raymond, William P. Blair, & Knox S. Long ON TWO THEORIES OF THE CYCLICAL OUTBURSTS OF n CARINAE Richard B. Stothers & Chao-wen Chin AN IMPLICIT INTEGRAL METHOD TO SOLVE SELECTED RADIATIVE TRANSFER PROBLEMS. IV. THE CASE OF SPHERICAL GEOMETRY M. Gros, L. Crivellari, & E. Simonneau INJECTION OF RADIOACTIVE NUCLIDES FROM THE STELLAR SOURCE THAT TRIGGERED THE COLLAPSE OF THE PRESOLAR NEBULA Prudence N. Foster & Alan P. Boss STOCHASTIC ACCELERATION AND PHOTON EMISSION IN ELECTRON-DOMINATED SOLAR FLARES Brian T. Park, Vahé Petrosian, & Richard A. Schwartz ELECTRON ACCELERATION BY RANDOM DC ELECTRIC FIELDS Anastasios Anastasiadis, Loukas Vlahos, & Manolis K. Georgoulis ON THE ROLE OF THE SOLAR CORONA AND TRANSITION REGION IN THE EXCITATION OF THE SPECTRUM OF NEUTRAL HELIUM Vincenzo Andretta & Harrison P. Jones THE ROTATIONAL STRUCTURE OF THE REGION BELOW THE SOLAR CONVECTION ZONE P. R. Wilson, D. Burtonclay, & Y. Li THE STRUCTURE OF THE SOLAR CORONA ABOVE SUNSPOTS AS INFERRED FROM RADIO, X-RAY, AND MAGNETIC FIELD OBSERVATIONS A. Vourlidas, T. S. Bastian, & M. J. Aschwanden PSEUDO-TWO-DIMENSIONAL HYDRODYNAMIC MODELING OF SOLAR FLARE LOOPS Kuniko Hori, Takaaki Yokoyama, Takeo Kosugi, & Kazunari Shibata A SPECTRAL ANALYSIS OF THE MASUDA FLARE USING YOHKOH HARD X-RAY TELESCOPE PIXON RECONSTRUCTION David Alexander & Thomas R. Metcalf NEW INSTRUCTIONS TO AUTHORS—REVISED 1997 JUNE 1 CONTENTS 1997 NOVEMBER 10, Number 2 THE TOPOLOGY OF LARGE-SCALE STRUCTURE IN THE 1.2 Jy IRAS REDSHIFT SURVEY Zacharias A. M. Protogeros & David H. Weinberg TWO-DIMENSIONAL TOPOLOGY OF LARGE-SCALE STRUCTURE IN THE LAS CAMPANAS REDSHIFT SURVEY Wesley N. Colley CURVATURE OF THE UNIVERSE AND OBSERVED GRAVITATIONAL LENS IMAGE SEPARATIONS VERSUS REDSHIFT Myeong- Gu Park & J. Richard Gott II DO LENSING STATISTICS RULt OUT A COSMOLOGICAL CONSTANT? Masashi Cisiba & Yuzuru Yoshii MICROLENSINC OF QUASARS BY STARS IN THEIR DAMPED Lya ABSORBERS Rosalba Perna & Atraham Loeb MEASURING THE DENSITY FLUCTUATION FROM THE CLUSTER GAS MASS FUNCTION Kazuhiro Shimasaku STATISTICS OF GRAVITATIONAL MICROLENSING MAGNIFICATION. I. TWO-DIMENSIONAL LENS DISTRIBUTIONS Lev Kofman, Nick Kaiser, Man Hoi Lee, & Arif Babul STATISTICS OF GRAVITATIONAL MICROLENSING MAGNIFICATION. II. THREE-DIMENSIONAL LENS DISTRIBUTION Man Hoi Lee, Arif Babul, Lev Kofman, & Nick Kaiser THE NATURE OF COMPACT GALAXIES IN THE HUBBLE DEEP FIELD. I. GLOBAL PROPERTIES Andrew C. Phillips, Rafael Guzman, Jesus Gallego, David C. Koo, James D. Lowenthal, Nicole P. Vogt, S. M. Faber, & Garth D. Illingworth THE NATURE OF COMPACT GALAXIES IN THE HUBBLE DEEP FIELD. II. SPECTROSCOPIC PROPERTIES AND IMPLICATIONS FOR THE EVOLUTION OF THE STAR FORMATION RATE DENSITY OF THE UNIVERSE Rafael Guzman, Jesus Gallego, David C. Koo, Andrew C. Phillips, James D. Lowenthal, S. M. Faber, Garth D. Illingworth, & Nicole P. Vogt OPTICAL APPEARANCE OF THE DEBRIS OF A STAR DISRUPTED BY A MASSIVE BLACK HOLE Abraham Loeb & Andrew Ulmer THE SUPERMASSIVE BLACK HOLE OF M87 AND THE KINEMATICS OF ITS ASSOCIATED GASEOUS DISK F. Macchetto, A. Marconi, D. J. Axon, A. Capetti, W. Sparks, & P. Crane O vi+ LyB + Cn FROM STARBURST AND POSTSTARBURST GALAXIES. I. STELLAR LIBRARY AND EVOLUTIONARY SYNTHESIS PROFILES Rosa M. Gonzalez Delgado, Claus Leitherer, & Timothy Heckman OBSCURATION IN THE HOST GALAXIES OF SOFT X-RAY-SELECTED SEYFERT NUCLEI Robert Simcoe, K. K. McLeod, Jonathan Schachter, & Martin Elvis NEARBY YOUNG DWARF GALAXIES: PRIMORDIAL GAS AND Lya« EMISSION Trinh X. Thuan & Yuri I. Izotov ELEMENTAL ABUNDANCE VARIATIONS AND CHEMICAL ENRICHMENT FROM MASSIVE STARS IN STARBURSTS. II. NGC 1569 Henry A. Kobulnicky & Evan D. Skillman THE ULTRAVIOLET PROPERTIES OF THE NARROW-LINE QUASAR I Zw 1 Ari Laor, Buell J. Jannuzi, Richard F. Green, & Todd A. Boroson INTERSTELLAR ABUNDANCES IN THE MAGELLANIC CLOUDS. I. GHRS OBSERVATIONS OF THE SMALL MAGELLANIC CLOUD STAR Sk 108 D. E. Welty, J. T. Lauroesch, J. C. Blades, L. M. Hobbs, & D. G. York GAMMA-RAY BURSTER COUNTERPARTS: HUBBLE SPACE TELESCOPE BLUE AND ULTRAVIOLET DATA Bradley E. Schaefer, Thomas L. Cline, Kevin C. Hurley, & John G. Laros THE YOUNG MASSIVE STELLAR OBJECTS OF M17 M. M. Hanson, I. D. Howarth, & P. S. Conti A SEARCH FOR INFALL MOTIONS TOWARD NEARBY YOUNG STELLAR OBJECTS D. Mardones, P. C. Myers, M. Tafalla, D. J. Wilner, R. Bachiller, & G. Garay CONTENTS THE AMMONIA CORE IN L723: HOT SPOTS AT THE CENTER OF THE QUADRUPOLAR MOLECULAR OUTFLOW José M. Girart, Robert Estalella, Guillem Anglada, José M. Torrelles, Paul T. P. Ho, & Luis F. Rodriguez A RADIO JET-H,O0 MASER SYSTEM IN W75N(B) AT A 200 AU SCALE: EXPLORING THE EVOLUTIONARY STAGES OF YOUNG STELLAR OBJECTS José M. Torrelles, José F. Gomez, Luis F. Rodriguez, Paul T. P. Ho, Salvador Curiel, & Roberto Vazquez DETECTION OF INTERSTELLAR ETHYLENE OXIDE (c-C,H,O) t J. E. Dickens, W. M. Ohishi, M. Irvine, M. Ikeda, S. Ishikawa, A. Nummelin, & A. Hjalmarson PROBING THE PHOTODISSOCIATION REGION TOWARD HD 200775 S. R. Federman, D. C. Knauth, David L. Lambert, & B-G Andersson WEAK CHARGE-CHANGING FLOW IN EXPANDING r-PROCESS ENVIRONMENTS Gail C. McLaughlin & George M. Fuller ON THE EVOLUTION OF STARS THAT FORM ELECTRON-DEGENERATE CORES PROCESSED BY CARBON BURNING. IV. OUTWARD MIXING DURING THE SECOND DREDGE-UP PHASE AND OTHER PROPERTIES OF A 10.5 Mj MODEL STAR Icko Iben, Jr., Claudio Ritossa, & Enrique Garcia-Berro SPECTRUM OF OPTICALLY THIN ADVECTION-DOMINATED ACCRETION FLOW AROUND A BLACK HOLE APPLICATION TO SAGITTARIUS A* T. Manmoto, S. Mineshige, & M. Kusunose THREE-DIMENSIONAL SIMULATIONS OF RUNAWAY INSTABILITY OF SELF-GRAVITATING ACCRETION DISKS Nobuyuki Masuda & Yoshiharu Eriguchi ON THE VARIABILITY COHERENCE OBSERVED IN BLACK HOLE CANDIDATES AT DIFFERENT X-RAY ENERGIES Marek A. Abramowicz, Gang Bao, Stefan Larsson, & Paul J. Wiita EVOLUTIONARY AND PULSATIONAL CONSTRAINTS FOR SUPER-METAL-RICH STARS WITH Z = 0.04 Giuseppe Bono, Filippina Caputo, Santi Cassisi, Vittorio Castellani, & Marcella Marconi EXOTIC NUCLEAR ROD FORMATION INDUCED BY SUPERFLUID VORTICES IN NEUTRON STAR CRUSTS Yuko S. Mochizuki, Kazuhiro Oyamatsu, & Takeo Izuyama ADVECTION-DOMINATED ACCRETION AND THE SPECTRAL STATES OF BLACK HOLE X-RAY BINARIES: APPLICATION TO NOVA MUSCAE 1991 Ann A. Esin, Jeffrey E. McClintock, & Ramesh Narayan MAGNETOHYDRODYNAMIC SIMULATIONS OF STELLAR MAGNETOSPHERE-ACCRETION DISK INTERACTION Kristen A. Miller & James M. Stone THE SMALL MAGELLANIC CLOUD, SUPERSOFT X-RAY BINARY 1E 0035.4—7230 (SMC 13) David Crampton, J. B. Hutchings, A. P. Cowley, & P. C. Schmidtke DISCOVERY OF QUASI-PERIODIC OSCILLATIONS IN THE AM HERCULIS OBJECT BL HYDRI John Middleditch, James N. Imamura, & Thomas Y. Steiman-Cameron CONSTRAINTS ON THE HL TAURI PROTOSTELLAR DISK FROM MILLIMETER- AND SUBMILLIMETER-WAVE INTERFEROMETRY O. P. Lay, J. E. Carlstrom, & R. E. Hills MAGNETIC FIELD DECAY IN SINGLE RADIO PULSARS: A STATISTICAL STUDY Soma Mukherjee & Ajit Kembhavi THE CORRECT PROBABILITY DISTRIBUTION FOR THE PHASE DISPERSION MINIMIZATION PERIODOGRAM A. Schwarzenberg-Czerny ON CIRCUMSTELLAR ENVELOPE FORMATION G. Pascoli B- DECAY AND COSMIC-RAY HALF-LIFE OF **Mn T. Kibédi, M. Kerr, E. B. Norman, G. D. Dracoulis, & A. P. Byrne KINEMATIC MODELING OF VORTICES IN THE SOLAR PHOTOSPHERE G. W. Simon & N. O. Weiss CONTENTS NUCLEAR ELECTRON CAPTURE IN A PLASMA Lowell S. Brown & R. F. Sawyer MAGNETIC FIELD CONFIGURATION IN IMPULSIVE SOLAR FLARES INFERRED FROM COALIGNED MICROWAVE/X-RAY IMAGES Masanori Nishio, Kentaro Yaji, Takeo Kosugi, Hiroshi Nakajima, & Takashi Sakurai FAST AND SLOW WIND FROM SOLAR CORONAL HOLES S. Bravo & G. A. Stewart QUANTUM MECHANICAL CALCULATIONS OF ROTATIONAL TRANSITIONS IN H-H, COLLISIONS Robert C. Forrey, N. Balakrishnan, Alex Dalgarno, & Stephen Lepp ERRATA OPTICAL SPECTROSCOPY OF EZ CANIS MAJORIS: IND'CATION FOR LARGE-SCALE STRUCTURES IN A WOLF-RAYET WIND Thierry Morel, Nicole St-Louis, & Sergey V. Marchenko THE PRIMORDIAL ABUNDANCE OF “He: AN UPDATE: ERRATUM Keith A. Olive, Evan D. Skillman, & Gary Steigman