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zeta Tau observation report 2013

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Ernst Pollmann
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Joined: 2012-02-03

Observation report 2012/13 of the Hα- and He6678 monitoring of ζ Tau

Fig. 1 (above & middle): Hα-Profile
the central absorption core of the Hα-profile reached its max. depth on 10. Feb. 2013 (JD 2456334). It indicates the min. size (volume) of the gas disk around the primary. It´s the first time, that an EW (disk) minimum for ζ Tau have been observed at a certain date.

Fig. 1 (below): Hα-EW
EW reached its historical min. at the same time. Newest measurements do show a slow rise now.

Fig. 2: Hα-V/R
Corresponding the disk size minimum and the low EW level of Hα, very small V/R activities. We can expect a rise of it during the next visibility of the star.

Fig. 3: HeI6678
Fig. 3 shows the phase behavior of the well-known 132.9735d-period [1, 2, 3]. Observer of the campaign 2012/13: C. Sawicki, St. Charbonnel, B. Mauclaire, E. Pollmann.
The relatively large RV scatter could be caused by ultra-short-term variations, due to co-rotating clouds and/or non-radial pulsations of the primary.

[1] Ruzdjak, D., et al., A&A, 506, 1319-1333, 2009
[2] Harmanec, P. ,1984, Bull. Astron. Inst. Czech., 35, 164
[3] Pollmann, E., Mauclaire, B., Bücke, R., IBVS 6099

Ernst Pollmann
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Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete

Figures to the report
Ernst Pollmann's picture
Ernst Pollmann
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Joined: 2012-02-03

I did forget to attache the Fig.

E. P.

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