Eps Per is monitored in the project BRITE.
There are several satellites which are do photometrie of this and other stars.
In a ProAm cooperation, amateurs deliver spectra to allow the proffessionals to make models of pulsation of stars from the satellite and spectra data.
Telescope: Celestron C11, f/10, d=280mm
Spectrograph: Lhires III, 2400gr, slit 23u Resolution: 0.09 Å / pixel, resolving power = 11000
Camera: SBIG STT-8300M / SBIG STi Acquisition software: SbigControl
Date: 25th December 2017, 21:20 - 02:05 UT
Spectra with 2400 lines/mm, processed with BASS project
Calibrated with ArNe before and after imaging, normalized flux
31 x 1 images, each 480 seconds (8 minutes)
Dark and Flat corrected and stacked with Pxinsight
|Download spectra (ZIP) 1D FIT: epsPer_20171225.zip|
Download spectra (ZIP) RAW FIT (16MB): epsPer_20171225_RAW.ZIP
Download full project (60MB): epsPer_20171225_proj.zip
Stellar data (Wikipedia.org):
Constellation: Perseus, RA: 03h 57m 51.23205s, Dec: +40° 00′ 36.7752″
v = 2.88 mag
Rv = -1 km/s
Distance: 640 +- 30 ly, 196 +-9 pc
Mass: 13.5 +-2.0 MΘ (A), 0.85 -1.77 MΘ (B)
Radius: 7.66 RΘ (A), 1.4 +-0.4 RΘ (B)
Luninosity: 28330 LΘ
Rotational velocity: 155 +-20 km/s (A), 300 +-30 km/s (B)
Age: 15.4 +-0.6 x 10^6 years