Ha spectrum of Gamma Cassiopeiae - Tsih - HD 5394 - SAO 11482 [B0IVe] - 2020-04-09 - He 6678 - Astrophoto

Astro-Imaging - Spectroscopy - Software Development
Manfred Schwarz - Austria
M51
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Ha spectrum of Gamma Cassiopeiae - Tsih - HD 5394 - SAO 11482 [B0IVe] - 2020-04-09 - He 6678

Specs



Tsih is a typical Be star, that means there is a disk of gas around the star. The emission lines are caused by this disk.
The star rotates very fast (~ 300km/s). This could be one reason for this disk.
Telescope: Celestron C11, f/10, d=280mm
Spectrograph: Lhires III, 2400gr, slit 23u    Resolution: 0.0693 Å / pixel, resolving power = 18600
Camera: SBIG STT-8300M / SBIG STi   Acquisition software: SbigControl
Date: April 9, 2020,  19:11-20:19 UT, JD 2458949,32
Spectra with 2400 lines/mm, processed with SpectroCalc2
Calibrated on ArNe lines, normalized flux
5 images, each 480 seconds (40 minutes)
Dark/Flat corrected and stacked with SpectroCalc2
Download spectrum 1D FIT: GamCas_20200409_He6678_woContCorr_Manfred_Schwarz.fit
Download spectrum 1D FIT with continuum correction: GamCas_20200409_He6678_Manfred_Schwarz.fit
Download SpectroCalc2-project file: GamCas_20200409_He6678_Manfred_Schwarz.sc2
Stellar data (Wikipedia.org):
Constellation: Cassiopeia, RA: 00h 56m 42.50108s, Dec: +60° 43′ 00.2984″
v = 2.47 mag, Mv = -4 mag
Rv = -6.8 km/s
Distance: 550 +- 10 ly, 168 +-3 pc
Mass: 19.3 +-0.1 MΘ
Radius: ~ 10 RΘ
Luninosity: 55000 LΘ
Rotational velocity: ~300 km/s
Age: 8 +-0.4 x 10^6 years
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