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