Hα spectrum of Alpha Cygni - Deneb - HD 197345 - SAO 49941 [A2Ia]
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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. |
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| Telescope: Celestron C11, f/10, d=280mm | Spectra with 2400 lines/mm, processed with BASS project | Download spectrum 1D FIT: deneb_20151005_Ha.FIT |
| Spectrograph: Lhires III, 2400gr, slit 23u | Calibrated with on atmospheric H2O lines, relative flux | Download spectrum DAT (dry, normalized): deneb_20151005_ha_norm_dry.dat |
| Camera: SBIG ST10-Xe | 7 images, each 500 seconds (58 minutes) | |
| Resolution: 0.09 Å / pixel, resolving power = 17000 | Dark corrected, cropped, enlarged by factor 4 and stacked with PixInsight | Download BASS project bundle: Deneb_20151005_Ha.bun |
| Acquisition software: SbigControl Guiding Software: DMKguider | Calibrated with BassProject, RV-Graphic with VSpec | Download complete project(2.1MB): Deneb_20151005.zip |
| Date: 5. October 2015, 20:33- 21:34 UT, JD 2457301.38 | S/N: >200 (VSpec) | |
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| Stellar data (Wikipedio.org): | ||
| Constellation: Cygnus, RA: 20h 41m 25.915s, Dec: +45° 16′ 49.217″ | ||
| v = 1.25 mag, Mv = -8.6 mag | ||
| Rv = -4.9 km/s | ||
| Distance: 3000 +- 2000 ly, 1000 +-600 pc | ||
| Mass: 20 - 25 MΘ | ||
| Radius: ~ 100 - 200 RΘ | ||
| Luninosity: 250000 LΘ | ||
| Rotation: 80 days | ||
| Temperature: 8400 K | ||
