Hα spectrum of VV Cephei - HD 208816 - SAO 19753 [M2epIa-Iab + B8:eV]
VV Cephei is an eclipsing binary star system with a M2 and a B8 star The emission lines are caused by a disk around the B star, probable an accretion disk with material feeded by the supergiant M star. There is a campaign throug the next eclipse 2017 to 2019. More information about this: |
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Telescope: Celestron C11 11" SC, f/10, d=280mm | Spectra with 2400 lines/mm, processed with BASS project | Download spectrum 1D FIT: vvCep_20151207_Ha.FIT |
Spectrograph: Lhires III, 2400gr, slit 23u | Ha calibrated with internal Ar-Ne lamp, normalized flux | Download spectrum FIT (RAW): vvCep_8x8min_20151207.fit |
Camera: SBIG STT-8300M | Exposure time: 8 x 480s. | |
Resolution: 0.0693 Å / pixel, resolving power = 18600 | Dark and Flat corrected, cropped, enlarged by factor 2 and stacked with PixInsight | Download BASS project bundle: vvCep_20151207.bun |
Acquisition software: SbigControl, Guiding with DMKguider | Calibrated, RV-measure with HRV-MM2 | Download complete project(1.8MB): vvCep_20151207.zip |
Date: 7. December 2015, 22:00 - 23:07 UT, JD 2457364.43 | ||
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Stellar data (Wikipedio.org): | ||
Constellation: Cepheus, RA: 21h 56m 39.1s, Dec: +63° 37′ 32.0″ | ||
v = 4.91 mag Mv = -6 | ||
Distance: 4900 ly, 1500 pc | ||
Mass: A ~ 25, B ~ 20 MΘ | ||
Radius: A ~ 1600 - 1900, B ~10 RΘ | ||
Luninosity: A ~ 200000-320000, B ~ 10000 LΘ | ||
Surface Temperature: A: ~3800, B: ~25000 K | ||