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 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:
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RA (2000) DE Designation(s)
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23 03 15.3 +08 52 25 NGC 7469
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table 73 154 Equivalent widths of the emission lines
in NGC 7469
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Byte-by-byte Description of file: table
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Bytes Format Units Label Explanations
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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
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(End) Veta Avedisova [INASAN] 30-Dec-1996