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Periastron of 28 Tau

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Periastron of 28 Tau

Dear colleagues,
the so far high cadence of spectra enables very well the determination of the exact time of the last periastron (important to determine the orbital period of the companion). Thanks a lot to all the colleagues who contributed so far!!

But in order to evaluate the total character of the periastron passage with parameter EW, V/R, RV and CA (= central absorption core) of the Halpha line profile, further spectra are urgently required.
Please try it, if it is possible ...

Ernst Pollmann

AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484