pi Aqr V/R and EW monitoring

pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Tue Aug 13, 2013 9:58 am

As supplement to Valerie´s monthly report, here the evaluation of the current Halpha EW & V/R long-term behavior of pi Aqr. Obviously the EW long-term component is on the way to a minimum. The Halpha-V/R 86day-period (found by Zharikov et al.) see:
http://astrospectroscopy.de/PiAqr_draft_061213.pdf

does not fit well to the current time behavior of the 2013 measurements. Period shortening ? Observations during the next months are going to show, whether a shortening of the period will really happen or not. Therefore an active observation participation will be very important!

Ernst Pollmann
--------------------------------------------
Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete
Attachments
EW_VR_Zeitverhalten.png
EW_VR_Zeitverhalten.png (178.29 KiB) Viewed 7530 times
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Re: pi Aqr V/R and EW monitoring

Postby Olivier GARDE » Sun Aug 18, 2013 1:27 pm

A little change in the spectra of Pi Aqr since my last spectrum of July the 30th.
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: pi Aqr V/R and EW monitoring

Postby Olivier GARDE » Sun Sep 22, 2013 12:07 pm

The evolution of this Be star from july to september
Image
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Wed Jan 08, 2014 10:29 am

The visibility phase of the Be binary star pi Aqr is more or less past, and we can look back on a fantastic collaboration of observation in terms of the V/R and EW measurement (see attachment). We have been able to detect two V/R maxima and minima. Thanks so much to all participants for your contributions.

While the Halpha EW is on the way to its minimum (the primary almost without any disk), the V/R ratio seems in spite of that to have had a growing amplitude (compared with its behavior during the last observation campaign).
I will contact our professional colleagues Anatoly Miroshnichenko and Sergey Zarikov in order to ask, how we have to understand this fact.

Ernst Pollmann
-------------------------------------
ASPA-Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete
Attachments
piaqr.jpg
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Re: pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Sun Jul 12, 2015 5:43 pm

Dear colleagues,
please don't forget to observe again the object of the season: pi Aqr.
Particularly interesting seems to be the un-usual strong increase of the Halpha emission!

Ernst Pollmann
---------------------------------------------
International Working Group ASPA
Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische- ... troskopie/
Attachments
Overview_piaqr.jpg
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Re: pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Mon Oct 12, 2015 12:55 pm

Dear colleagues,
attached you can find the ARAS monitoring of pi Aqr.

Ernst Pollmann
Attachments
piaqr_monitoring.png
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Re: pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Fri Oct 30, 2015 12:44 pm

Disk enlargement of the Be binary pi Aqr ?
Related to the topic above, here a summary of the monitorings since October 2004 (Halpha V/R) and August 1989 (Halpha EW).
Comments are very welcome.

Ernst Pollmann
Attachments
VR_EW_piaqr.png
VR_EW_piaqr.png (123.43 KiB) Viewed 6657 times
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Re: pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Thu Dec 22, 2016 12:20 pm

Dear colleagues,
almost at the end of the visibility of the Be binary pi Aqr, here a summary of the V/R periodic behavior.
Compared with our publication in 2013 http://astrospectroscopy.de/media/files/A-A-560,-A30-(2013).pdf
it confirms the periodicity with 84.25 days.
Thank you all for your observations and spectra which enables to draw this overview. Comments are welcome!!
piaqr_VtoR-Analysis.png
piaqr_VtoR-Analysis.png (221.45 KiB) Viewed 5916 times

Best wishes, Ernst Pollmann
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Re: pi Aqr V/R and EW monitoring

Postby Ernst Pollmann » Sun Aug 04, 2019 2:59 pm

Dear colleagues,
in supplement to the paper of Yael Naze (New Astronomy 73, 2019, 101279) here an up-dated analysis of Halpha EW and V/R since October 2004

See:
https://astrospectroscopy.de/Projects;f ... ?id=344540

It seems of high interest to monitore the star during the following years in terms of evolution of the Halpha maximum and the beginning of clear V/R activity. At present it is almost impossible to determine V/R because of the balanced density within the disk. But the time will come, when local density differences will appear.

Ernst Pollmann
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Re: pi Aqr V/R and EW monitoring

Postby jack martin » Mon Mar 09, 2020 6:21 pm

Here is my time lapse of 9 observations of pi aqr h alpha profile with Atik 460 mono C14 Lhires III 2400 l/mm grating from 02-08-2019 to 10-01-2020.

I think this is an effective way of showing changes in spectral profiles over time.

Many thanks to John Paraskeva creator of BASS for his help in creating this animation.

Enjoy,

Jack

Essex UK
Attachments
pi aqr BASS.gif
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