Ha & Hb spectrum of VV Cephei - HD 208816 - SAO 19753 [M2epIa-Iab + B8:eV] - 2015-08-17
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. More information about this:
Telescope: Astrophysics Starfire 5", f/8, d=130mm
Spectrograph: Lhires III, 2400gr, slit 23u Resolution: 0.09 Å / pixel, resolving power = 17000
Date: 17. August 2015, Ha 21:30 - 22:15UT, JD 2457252.42, Hb 20:23 - 21:18
Spectra with 2400 lines/mm, processed with BASS project and VSpec Ha calibrated with external Ne lamp, normalized flux Ha: 7 x 4 min., Hb: 12 x 4min Dark corrected, cropped, enlarged by factor 4 and stacked with Giotto Calibrated, RV-measure with HRV-MM2 | Download spectrum DAT: VVcep_20150817_Ha_1D.DAT Download spectrum 1D FIT: VVcep_20150817_1D.FIT Download BASS project bundle: VVcep_20150817.bun, VVcep_20150817_Hb.bun Download complete project(9MB): VVcep_20150817.zip |
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
