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28 Tau ARAS monitoring

PostPosted: Mon Oct 12, 2015 9:34 am
by Ernst Pollmann
Dear colleagues,
attached you can find the ARAS monitoring of the Be star 28 Tau. As you can see, the last periastron is obviously past already. It's a pity, because the next will be in approx. 218 days.

Ernst Pollmann

Re: 28 Tau ARAS monitoring

PostPosted: Sat Oct 29, 2016 5:28 am
by James Foster
To Ernst,

By chance I shot Pleione on 10Oct16, here is the graphic of the Ha region:
Image

Are these to Fe2 lines real? Its curious that there so prominent in this region.

I've formatted the 1D spectral .fit file for BeSS and it can be downloaded here:
http://www.astroimage.info/spectra/HD23862_Ha10102016.tif

Please rename the suffix .tif to .fit. When I leave it as filename.fit, my server
doesn't permit downloading.

James Foster
Los Angeles, CA

Re: 28 Tau ARAS monitoring

PostPosted: Sun Oct 30, 2016 8:37 am
by Ernst Pollmann
Hi James,
I didn't find any information of the FeII lines (6456.376 & 6516.53) in literature. But at least it seems to be real, by comparison with the BeSS spectrum of Tim Lester at the same date. On the other hand, these both Fe lines are absent in a ELODIE spectrum from 2003 (see the Fig. below).
So, I can't say anymore to that observation fact.
28tau.png
28tau.png (115.25 KiB) Viewed 5140 times


Ernst

Re: 28 Tau ARAS monitoring

PostPosted: Sun Oct 30, 2016 12:05 pm
by James Foster
To: Ernst,

Thanks for the confirm with Tim Lester's spectra. I have additional spectra of this star in Hb and Cak regions
on the same date. Will post them Asap and continue to monitor. Glad you were able to download my spectra.

James Foster
Los Angeles, CA

Re: 28 Tau ARAS monitoring

PostPosted: Mon Oct 31, 2016 2:02 pm
by James Foster
Here are the Hb & CaK spectra for 28 Tau:
Hb
Image
CaK
Image

Here are the .fits (with .tif endings to permit download) for inclusion into the BeSS database:
Hb: http://www.astroimage.info/spectra/HD23862_Hb10102016.tif
CaK: http://www.astroimage.info/spectra/HD23862_CaK10102016.tif

I think those Fe2 lines are still present in data I took this morning...will reduce it after sleep/work.....

James Foster
Los Angeles, CA

Re: 28 Tau ARAS monitoring

PostPosted: Tue Nov 01, 2016 1:10 pm
by James Foster
Here is my 28 Tau data from last night. I think the 2nd Fe2 line is probably the nearby H2O line,
but I kept both together for clarity:
Image

Here is the Hb region shot shot the same night:
Image

While going thru elements_sort.dat, I identified more possible Fe, Fe2, Mn1, & Na2 lines.
I'm sure one of more might also be telluric, but I keep them here for possible
follow-up. Lastly, here is my CaK region, whose H-balmer series is identified:
Image

James Foster
Los Angeles, CA

Re: 28 Tau ARAS monitoring

PostPosted: Wed Nov 02, 2016 10:13 am
by Ernst Pollmann
Dear colleagues,
don't forget to observe the next periastron passage of the Be binary star 28 Tauri at January 4th 2017.
Attached you can see the current RV and V/R observation of James Foster and Tim Lester.
28tau.png
28tau.png (247.45 KiB) Viewed 5057 times

Ernst Pollmann

Re: 28 Tau ARAS monitoring

PostPosted: Thu Nov 03, 2016 8:58 am
by James Foster
To: Ernst,

Here are the 1D spectra for my last 28 Tau post (31Oct16 data):
http://www.astroimage.info/spectra/HD23862_Ha10312016.tif
http://www.astroimage.info/spectra/HD23862_Hb10312016.tif
http://www.astroimage.info/spectra/HD23862_CaK10312016.tif
As before rename to suffix from .tif to .fit and they'll be perfectly view-able
if your spectra software. Cheers!

James Foster
Los Angeles, CA

Re: 28 Tau ARAS monitoring

PostPosted: Sun Nov 06, 2016 9:26 am
by Ernst Pollmann
James,
here comes the Halpha EW, V/R and RV evaluation.
The link...
http://astrospectroscopy.de/media/files/Periastron_-28-Tau_englisch.pdf
... offers some information about previous passages.
28tau_RV.jpg
28tau_RV.jpg (85.55 KiB) Viewed 4979 times

28tau_VtoR.jpg
28tau_VtoR.jpg (84.98 KiB) Viewed 4979 times

28tau_EW.jpg
28tau_EW.jpg (77.47 KiB) Viewed 4979 times


Ernst

Re: 28 Tau ARAS monitoring

PostPosted: Thu Nov 10, 2016 4:12 am
by James Foster
To: Ernst,

Thanks for the reference on the probable disk structure of Pleione's disk.
I need to make more observation for this, but it comes up at a difficult time of the
night for me who still works a day job!

James Foster
Los Angeles, CA