Halpha-triple-peak in zeta Tau

Halpha-triple-peak in zeta Tau

Postby Ernst Pollmann » Sun Nov 14, 2021 11:48 am

Since the Be-star is at present again (still) in its Be phase, there is the chance to observe the so-called "triple peak" in Halpha. This "triple-peak-phase" has been observable in the past twice (see: EW-Monitoring_triple-peak.png).
At present spectra of A. Stiewing, J. Martin, A. Favaro and E. Bryssinck show this since November 2019 to now (see: Triple peak spectra.png).
It seems, that this "triple-peak-phase" occures only at times, when the circum stellar disk does have a certain level in mass and/or volume. The physicall causes seems to be unclear. That´s why our professionall colleague Thomas Rivinius (ESO Chile) does have a high interest in monitoring spectra of zeta Tau. Because of that it would be importand to take spectra during the next months.

C. Escolano et al. wrote in:
A&A 576, A112 (2015)
DOI: 10.1051/0004-6361/201425446


The origin (i.e., the physical process giving rise to those profiles) and nature (three distinct emission components vs. self-absorption overlapping with an emission component) of the triple-peaked profiles are puzzling issues that, together with the shell-line profile perturbations highlighted here, deserve some discussion.

EW-Monitoring_triple-peak.png

Triple peak spectra.png
Triple peak spectra.png (43.34 KiB) Viewed 1144 times


For comparison, a triple-peak spectrum from 2007-11-28 in:
CHARA Collaboration Year-Five Science Review by Gail Schaefer (CHARA / GSU)
triple peak spectrum 2007-11-28.png


Ernst Pollmann
Ernst Pollmann
 
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