Ca II K line in Be star spectra? V403 Pup

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James Ley
Posts: 70
Joined: Tue Jan 23, 2018 6:57 pm

Ca II K line in Be star spectra? V403 Pup

Post by James Ley »

I saw that V403 Pup didn't have any spectra in the BeSS database, so I observed it. Twice.
First was on Mar 3
V403 Pup 0303 full spec.png
V403 Pup 0303 full spec.png (18.19 KiB) Viewed 3035 times
I noticed and later identified the Ca II K line at 393.4 nm
V403 Pup 0303 zoom.png
V403 Pup 0303 zoom.png (18.94 KiB) Viewed 3035 times
I observed it again on Mar 11
V403 Pup 0310 full.png
V403 Pup 0310 full.png (17.15 KiB) Viewed 3035 times
The Ca II K line is gone but the He I line at 402.5 nm was much stronger.
V403 Pup 0310 zoom.png
V403 Pup 0310 zoom.png (16.92 KiB) Viewed 3035 times
In the literature I found references to Ca II emission lines in the IR as an indication of interacting binary Be stars
https://arxiv.org/pdf/1205.2259.pdf

These articles also mention the Ca II K absorption line:

https://arxiv.org/pdf/0711.2085.pdf

https://arxiv.org/pdf/1807.00907.pdf

Could I have caught a companion near periastron passage? Seems kind of lucky to me.
Does anyone know about the prevalence of the Ca II K line in Be star spectra?
Shelyak Alpy 600 (spectroscope, guiding module and calibration module) | GSO 8" f/4 | Orion Atlas Pro | ZWO ASI178MM-Cool (mono) | ZWO ASI290 Mini (mono)
"think like a photon" -- Steve Shore
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