28 Tau ARAS monitoring

Re: 28 Tau ARAS monitoring

Postby Ernst Pollmann » Fri Feb 02, 2018 3:12 pm

Dear colleagues,
here I want to show once more in detail the 28 Tau periastron observation of several members of the ARAS group.
The evaluation of V/R and RV allows very precisely the time determination of the periastron passage. This result shows impressively the advantage of campaign observations within a community.
28tau_periastron.jpg (37.1 KiB) Viewed 167 times

It shows also very clear the process of disk deformation at the V/R change during the minimum of the radial velocity, a phenomenon that could be observed for a first time since August 2011 (approx. JD 2455800), when the mass of the disk reached the minimum.
This disk minimum is reflected in our monitoring of the Halpha EW (see the following monitoring).

Ernst Pollmann
Ernst Pollmann
Posts: 281
Joined: Mon Sep 26, 2011 7:16 pm

Re: 28 Tau ARAS monitoring

Postby James Foster » Sat Feb 03, 2018 7:02 am

To: Ernst,

Great feedback on the 28 Tau Campaign. I just emailed you 23 more spectra of 28 Tau to use. I'll upload these into the BeSS database and
process 2 more I did when learning the LhiresIII / Isis in Oct17. Cheers!

James R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope, and
Star Analyzer 200
James Foster
Posts: 203
Joined: Sun Jan 24, 2016 7:14 am

Re: 28 Tau ARAS monitoring

Postby Ernst Pollmann » Wed Feb 07, 2018 4:54 pm

Dear colleagues,
The total monitoring of the Halpha profile of 28 Tau since October 2004 enables to investigate aspects of the precession of the disk.
Despite the intention to publish this investigation at IBVS, I want to inform here the involved observers about the results. The pre-publication is to find at:

Many thanks to all observers for the contribution of their spectra!!
Ernst Pollmann
Ernst Pollmann
Posts: 281
Joined: Mon Sep 26, 2011 7:16 pm


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