Nonradial pulsations of zeta Oph

[Ernst Pollmann]

Nonradial pulsations of zeta Oph: see

http://astrospectroscopy.de/zeta_Oph.pdf


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

[Bernard Heathcote]

Hi Ernst,

Interesting paper, well done.

I am a bit confused by the second sentence: "Whether this mechanism produced the disk around the star, is still the subject of specialized astronomical discussion". Do you mean that NPR is the cause of the disk, or that the NPR are produced IN the disk?

Cheers,
Bernard

[Ernst Pollmann]

hi Bernard,
this kind of pulsations are excited from inside the star and are going on for millions of cycles.
There are signs of interaction of the star photosphere with the disk, but there might be also another mechanism for disk forming.
Thomas Rivinius (ESO) did have treated this topic in his habilitation paper in 2005.

Ernst

[Ernst Pollmann]

New observation results !

http://astrospectroscopy.de/zeta_Oph.pdf

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

[Ernst Pollmann]

During four consecutive nights (24.-27.5.12) continuation of observations of the non radial pulsations of zeta Oph.

Results:

1. The Line profiles are more or less strong shaped, by the appearing and disappearing of an "emission" bump between 6575 to 6580 angströms, which moves (not always) uniformly across the line. This "bump" often shows a noticeable asymmetry in the way in which it traverses the profile (see plot of the single spectra).

2. Similar to the efforts of P. Harmanec (Bull. Astron. Inst. Czechol. 40, 1989) an attempt, to find out a correlation of the equivalent width with the 0.643 day period (see plot: EW v. JD, and plot: period analysis). The usage of the PDM methode of the program "AVE" leads to a period 0.65 d.


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

[Ernst Pollmann]

Some news to moving features in He6678 of zeta Oph.
See: http://astrospectroscopy.de/zeta_Oph.pdf

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

[Ernst Pollmann]

New improved version of the observation report (after consultation by Thomas Rivinius & Myron Smith).
In case of any interest, a topic for discussion during the OHP meeting.
See:
http://astrospectroscopy.de/zeta_Oph.pdf

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