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Spectroscopic Atlas for Amateur Astronomers 49

Hα Line P Cygni (900L): He I 6678.15

The "original" P Cygni star shows a highly impressive Hα He I 6678.15
emission line. Therefore the other spectral features appear
strongly compressed, so they are barely recognisable. The Hα Emisssion
blue absorption part of this line is strongly stunted.
In contrast to this, the helium emission at λ 6678 shows Hα EmisssionHα Absorption
here and in the lower profile of Table 13 (900L) a textbook- Hα Absorption
like P Cygni profile – the same does Hδ in the upper profile
of Table 13 (200L). To show the other lines, overprinting
here the telluric absorptions, the profiles in Table 13 are
strongly zoomed in the vertical intensity axis. The top of the
Hα emission is therefore cut. Noteworthy, that the contin-
uum appears significantly elevated in an area of some 100
Å around Hα.

11.3 Commented Spectra

Table 13: Overview and detailed spectrum of P Cygni (34 Cyg)

Overview spectrum (200L grating, recorded September 16, 2009) and a higher resolved
profile around the Hα line (900L grating, recorded June 22, 2010). The line identification is
based on [341].
Table 13 A: Detailed spectrum of P Cygni (34 Cyg)

Higher resolved profile sections (900L grating), recorded May 07, 2011) in the green and
blue area of the spectrum. The line identification in the range >λ 4100 is based on [341], in
the range of <λ 4100 according to [341a], [341b].

Remarks:

What appears in these profiles as absorptions turns out at a higher resolution in most cases
as emission lines or P Cygni profiles!