Ha spectrum of VV Cephei - HD 208816 - SAO 19753 [M2epIa-Iab + B8:eV] - 2017-12-25
Specs
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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. Start of eclipse was 4th August 2017. More information about this:
Telescope: Celestron C11 11" SC, f/10, d=280mm
Spectrograph: Lhires III, 2400gr, slit 23u Resolution: 0.0693 Å / pixel, resolving power = 18600
Date: 25th December 2017, 19:00 - 20:38 UT, JD 2458113.33
Spectra with 2400 lines/mm, processed with BASS project Ha calibrated with internal Ar-Ne lamp, normalized flux Exposure time: 10 x 480s Dark- corrected and stacked with PixInsight Calibrated, RV-measure with BASS project | Download spectrum 1D FIT: vvCep_20171225.FIT Download spectrum FIT (RAW): vvCep_20171225_RAW.fit Download spectrum ArNe (RAW): ArNe.fit Download BASS project bundle: vvCep_20171225.bun Download BASS project bundle (hc-corr): vvCep_20171225_v.bun |
Stellar data (Wikipedia.org):
Constellation: Cepheus, RA: 21h 56m 39.1s, Dec: +63° 37′ 32.0″
v = 4.91 mag, Mv = -6 mag
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
