Hα spectrum of Alpha Cygni - Deneb - HD 197345 - SAO 49941 [A2Ia] - 2015-10-24 - Astrophoto

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Manfred Schwarz - Austria
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Hα spectrum of Alpha Cygni - Deneb - HD 197345 - SAO 49941 [A2Ia] - 2015-10-24

Specs

Alpha Cygni is a prototype of variable stars which exhibit non-radial pulsations, meaning that some portions of the stellar surface are contracting at the same time, other pats expand.

It is a supergiant star in the passage of blue giant to red giant.

Stellar wind is shown in the spectra profile of Ha.
Telescope: Celestron C11 11" SC, f/10, d=280mm
Spectrograph: Lhires III, 2400gr, slit 23u    Resolution: 0.09 Å / pixel, resolving power = 17000
Camera: SBIG ST10-Xe    Acquisition software: SbigControl     Guiding software: DMKguider
Date: 24th October 2015,  20:06- 20:55 UT, JD 2457320.35
Spectra with 2400 lines/mm, processed with BASS project
Calibrated with on atmospheric H2O lines, relative flux
10 images, each 240 seconds (40 minutes)
Dark corrected, cropped, enlarged by factor 4 and stacked with PixInsight
Calibrated with BassProject    S/N > 300
Download spectrum 1D FIT:  Deneb_20151024_calibrated.FIT
Download spectrum DAT: Deneb_20151024.DAT
Download spectrum 1D IT (uncalibrated): Deneb_20151024_1D.FIT
Download BASS project: Deneb_20151024.bun Deneb_20151005_20151024.bun, Deneb_20151024vs20151005_V.bun
Download complete project(2MB): Deneb_20151024.zip
Stellar data (Wikipedia.org):
Constellation: Cygnus, RA: 20h 41m 25.915s, Dec: +45° 16′ 49.217″
v = 1.25 mag, Mv = -8.38 mag
Rv = -4.5 km/s
Distance: 2616 +- 215 ly, 802 +-66 pc
Mass: 19  ± 4 MΘ
Radius: 203 ± 17 RΘ
Luninosity: 196000 ± 32000 LΘ
Surface Temperature: 8,525 ± 75 K
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