zeta Tau observation report

[Ernst Pollmann]

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.

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 low disk size 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
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