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J/AZh/71/200     Spectral Investigation of NGC 7469      (Doroshenko+, 1994)

Spectral Investigation of NGC 7469 Using Image-Tube Observations from 1972-1990. Doroshenko V.T., Sergeev S. G., Chuvaev K. K. <Astron. Zh. 71, 200 (1994)> =1994AZh....71..200D
ADC_Keywords: Galaxies, spectra; Balmer lines Abstract: This investigation is mainly related to hydrogen lines in the spectrum of NGC 7469 from the 1972-1990 data obtained using an image tube on the 2.6-m telescope of the Crimean Astrophysical Observatory. The decomposition of the hydrogen lines into broad and narrow components was performed. Variations in the intensities and broad-component contours were observed. One third of the spectrograms showed a broad, symmetric Ha line, while the others showed asymmetry: the blue wings fall more steeply than the red ones. The degree of asymmetry is variable, but no correlation between it and the brightness of the nucleus was found. This asymmetry becomes weaker when passing to higher members of the Balmer series. The halfwidths of the broad components increase from Ha to Hγ. Redshifts of broad components with respect to narrow ones might also be larger for higher members of the Balmer series. Intensities of the broad hydrogen lines follow continuum variations with a delay of about 28 days. The Balmer decrement for broad lines is much flatter than for narrow ones. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 23 03 15.3 +08 52 25 NGC 7469 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table 73 154 Equivalent widths of the emission lines in NGC 7469
Byte-by-byte Description of file: table
Bytes Format Units Label Explanations
1- 8 A8 "DD/MM/YY" Date Observation date 11- 16 F6.2 0.1nm H(alpha)b ?Equivalent width of H(alpha) broad line 18- 22 F5.1 0.1nm H(alpha)n ?Equivalent width of H(alpha) narrow line 25- 29 F5.2 0.1nm [NII]6548 ?Equivalent width of [NII] 6548 A 32- 35 F4.1 0.1nm [NII]6583 ?Equivalent width of [NII] 6583 A 38- 42 F5.1 0.1nm H(beta)b ?Equivalent width of H(beta) broad line 45- 49 F5.2 0.1nm H(beta)n ?Equivalent width of H(beta) narrow line 52- 56 F5.2 0.1nm [OIII]4959 ?Equivalent width of [OIII] 4959 A 59- 62 F4.1 0.1nm [OIII]5007 ?Equivalent width of [OIII] 5007 A 65- 68 F4.1 0.1nm H(gamma)b ?Equivalent width of H(gamma) broad line 71- 73 F3.1 0.1nm H(gamma)n ?Equivalent width of H(gamma) narrow line

(End) Veta Avedisova [INASAN] 30-Dec-1996
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