ELECTRON-DENSITY DIAGNOSTICS FOR GASEOUS NEBULAE INVOLVING THE O-IV INTERCOMBINATION LINES NEAR 1400-ANGSTROM

被引：12
作者：
KEENAN, FP
CONLON, ES
BOWDEN, DA
FEIBELMAN, WA
PRADHAN, AK
机构：
[1] NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS,GREENBELT,MD 20771
[2] OHIO STATE UNIV,COLUMBUS,OH 43210
来源：
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 1993年 / 88卷 / 01期
关键词：
ATOMIC DATA; PLANETARY NEBULAE; GENERAL; ULTRAVIOLET; INTERSTELLAR;
D O I：
10.1086/191819
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Theoretical O iv electron density sensitive emission-line ratios, determined using electron impact excitation rates calculated with the R-matrix code, are presented for R1 = I(1407.4 angstrom)/I(1401.2 angstrom), R2 = I(1404.8 angstrom)/I(1401.2 angstrom), R3 = I(1399.8 angstrom)/I(1401.2 angstrom), and R4 = I(1397.2 angstrom)/I(1401.2 angstrom). The observed values of R1-R4, measured from high-resolution spectra obtained with the International Ultraviolet Explorer (IUE) satellite, lead to electron densities that are compatible, and which are also in good agreement with those deduced from line ratios in other species. This provides observational support for the accuracy of the atomic data adopted in the present calculations.
引用
收藏
页码：169 / 172
页数：4
相关论文
共 21 条
[1]   ATOMIC DATA FOR OPACITY CALCULATIONS .2. COMPUTATIONAL METHODS [J].
BERRINGTON, KA ;
BURKE, PG ;
BUTLER, K ;
SEATON, MJ ;
STOREY, PJ ;
TAYLOR, KT ;
YAN, Y .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1987, 20 (23) :6379-6397
[2]   RATE COEFFICIENTS FOR THE EXCITATION OF INFRARED AND ULTRAVIOLET LINES IN C-II, N-III, AND O-IV [J].
BLUM, RD ;
PRADHAN, AK .
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1992, 80 (01) :425-452
[3]   IMPACT, A PROGRAM FOR SOLUTION OF COUPLED INTEGRO - DIFFERENTIAL-EQUATIONS OF ELECTRON - ATOM COLLISION THEORY [J].
CREES, MA ;
SEATON, MJ ;
WILSON, PMH .
COMPUTER PHYSICS COMMUNICATIONS, 1978, 15 (1-2) :23-83
[4]   MULTICONFIGURATION HARTREE-FOCK CALCULATIONS FOR IONS OF BORON ISOELECTRONIC SEQUENCE [J].
DANKWORT, W ;
TREFFTZ, E .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1977, 10 (13) :2541-2552
[5]  
DUFTON PL, 1978, ASTRON ASTROPHYS, V62, P111
[6]   S-IV EMISSION-LINE RATIOS IN THE SUN [J].
DUFTON, PL ;
HIBBERT, A ;
KINGSTON, AE ;
DOSCHEK, GA .
ASTROPHYSICAL JOURNAL, 1982, 257 (01) :338-344
[7]   PROGRAM TO CALCULATE CORONAL EMISSION-LINE STRENGTHS [J].
DUFTON, PL .
COMPUTER PHYSICS COMMUNICATIONS, 1977, 13 (01) :25-38
[8]   COMPUTER PROGRAMS FOR CALCULATION OF ELECTRON-ATOM COLLISION CROSS-SECTIONS .1. GENERAL FORMULATION [J].
EISSNER, W ;
SEATON, MJ .
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 1972, 5 (12) :2187-2198
[9]  
Fawcett B. C., 1975, Atomic Data and Nuclear Data Tables, V16, P135, DOI 10.1016/0092-640X(75)90027-3
[10]   IUE OBSERVATIONS OF PROTO-PLANETARY AND VARIABLE PLANETARY-NEBULAE .1. V1016-CYGNI, HM SAGITTAE, AND HBV-475 [J].
FEIBELMAN, WA .
ASTROPHYSICAL JOURNAL, 1982, 258 (02) :548-561
123