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Nonradial pulsations of zeta Oph
Posted: Tue May 15, 2012 6:52 pm
by 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/
Re: Nonradial pulsations of zeta Oph
Posted: Tue May 15, 2012 9:31 pm
by 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
Re: Nonradial pulsations of zeta Oph
Posted: Wed May 16, 2012 9:07 am
by 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
Re: Nonradial pulsations of zeta Oph
Posted: Sat May 19, 2012 10:17 am
by Ernst Pollmann
Re: Nonradial pulsations of zeta Oph
Posted: Tue May 29, 2012 12:06 pm
by 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/
Re: Nonradial pulsations of zeta Oph
Posted: Tue Jul 17, 2012 7:39 pm
by 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/
Re: Nonradial pulsations of zeta Oph
Posted: Tue Jul 24, 2012 4:45 pm
by 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/