J/A+AS/103/83 Line identifications in a fireball spectrum (Borovicka 1994) ================================================================================ Line identifications in a fireball spectrum Borovicka J. =1994A&AS..103...83B ================================================================================ ADC_Keywords: Comets; Spectroscopy Keywords: meteors: spectra - line: identification Abstract: 305 emission lines were found in a spectrum of a fireball of -9th magnitude. The identification of most of the lines is given. Also a detailed tracing of the spectrum in the range 3600-6600{AA} is presented. The tracing contains also computed synthetic spectrum and both spectra can be easily compared. The following species were found in the spectrum: Fe I, Na I, Mg I, Al I, Ca I, Ti I, Cr I, Mn I, Ni I, Mg II, Si II, Ca II, Fe II, FeO, probably also Si I, Ba II, C_2_, and possibly V I, Co I, Cu I, Ti II. The presence of other chemical elements in meteor spectra is discussed. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 59 475 Identifications of spectral lines observed in the spectrum of the bright meteor EN 151068 spec-a.dat 15 2020 *Observed calibrated spectrum in the range 3575-4080{AA} at the meteor point 15F (2nd order) spec-b.dat 15 1477 *Observed calibrated spectrum in the range 4050-4420{AA} at the meteor point 19F (2nd order) spec-c.dat 15 8800 *Observed calibrated spectrum in the range 4400-6600{AA} at the meteor point 13F (1st order) -------------------------------------------------------------------------------- Note on spec-a.dat, spec-b.dat, spec-c.dat: The point 13F is the brightest meteor point. The short wavelengths were, however, better observable in the second order spectra at different meteor points and these spectra were used for line identifications. The spectra at different points cannot be simply joined, because the meteor brightness and physical conditions were different at different points. The data given in these three files were used for drawing the solid line in Fig.4 of the paper. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- No [1,305]+= Line number (1) 4- 10 F7.1 0.1nm LamObs Observed wavelength 11- 19 F9.2 0.1nm LamLab ? Laboratory wavelength 22- 34 A13 --- Atom Identification: atom and multiplet or molecule and vibrational band or "?" for an unidentified line 35- 39 F5.2 eV E1 ?lower excitation potential 40- 46 F7.2 --- log(gf) ? oscillator strength 47- 53 F7.2 100W/sr Icom ?computed line intensity 54- 60 A7 --- Rem Remark (2) ------------------------------------------------------------------------------- Note (1): One observed line may be formed by several lines. Note (2): the numbers have the following meaning: 1) contribution of Fe II 4583.85 A ? 2) possible contribution of C III - 1 3) contribution of C_2 4) only fragment? 5) cannot explain the whole line 6) overexposed line p.: point (boundaries of meteor points used are marked) 2nd: 2nd second spectrum -------------------------------------------------------------------------------- Byte-by-byte Description of file: spec-a.dat spec-b.dat spec-c.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 F7.2 0.1nm Lambda Wavelength (valid for the main piece) 8- 15 F8.4 kW/nm/sr OIR Observed intensity of radiation (including the radiation of the fragments) in 10+9erg/s/A/sr -------------------------------------------------------------------------------- ================================================================================ (End) Patricia Bauer [CDS] 13-Jan-1994