R Aqr Eclipse - Monitoring requested

R Aqr Eclipse - Monitoring requested

Postby Francois Teyssier » Fri Jul 12, 2019 8:54 pm

R Aqr could be in eclipse according to the luminosity of the system near the maximum of the pulsation.
Margarita Karovska (Center for Astrophysics | Harvard & Smithsonian) request spectroscopic monitoring (low and high res) as soon as possible.

François
Last edited by Francois Teyssier on Sat Aug 03, 2019 8:23 am, edited 1 time in total.
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Re: R Aqr Eclipse - Monitoring requested

Postby Francois Teyssier » Fri Jul 12, 2019 9:41 pm

The historical light curve in AAVSO database (Visual, 15 days mean)
since 1908

RAqr_Histo.PNG
RAqr_Histo.PNG (22.87 KiB) Viewed 880 times


The 3 last pulsations of the Mira
RAqr.PNG
RAqr.PNG (4.8 KiB) Viewed 880 times

with the recent maximum about 1 mag under the previous ones.
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Re: R Aqr Eclipse - Monitoring requested

Postby Francois Teyssier » Tue Jul 30, 2019 4:46 am

Echelle spectrum obtained this morning.

Emission lines looks weaker than during the previous pulsations of the mira at about the same luminosity

Na I D in emission.

raqr-comp.png
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Re: R Aqr Eclipse - Monitoring requested

Postby Francisco Campos » Wed Aug 28, 2019 12:07 pm

Hello,

after a long stop due to lack of time to observe, two days ago I could obtain some spectra. Here is a low resolution spectrum of R Aqr compared wiht another taken a year ago. More or less both spectra are taken in the same pulsation phase. The main difference is in the Mira intensity: the continuum is weaker as expected, but I don't appreciate more differences.

raqr_ 20190825_960_FPC.png


When I have finished processing the remaining spectra, I will upload them into the database.

Best regards,
Fran
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Re: R Aqr Eclipse - Monitoring requested

Postby Francois Teyssier » Wed Sep 11, 2019 9:08 pm

The target is now easy during the nights, but its luminosity declines.
The phase (pulsation) is ~ 0.2 and it will be easier to compare the spectra with those of previous cycles.
RAqr.PNG
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Re: R Aqr Eclipse - Monitoring requested

Postby Francois Teyssier » Fri Oct 18, 2019 4:30 am

The luminosity of the current pulse remains much lower in comparison to previous pulses

Significant changes of the main lines, EW and profile, especailly in the blue part of the lines:

Tim lester's spectra R = 140000

RAqr_LC.PNG
RAqr_LC.PNG (17.32 KiB) Viewed 53 times


Hac.png
Hac.png (22.19 KiB) Viewed 53 times


OI6363.png
OI6363.png (18.49 KiB) Viewed 53 times


NII5754.png
NII5754.png (17.66 KiB) Viewed 53 times


Margarita Karovska:
There it is definitely something going now...
Let see how the spectrum changes in the next couple of months.

and suggest: Can you do weekly spectroscopy?
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