Rho Cas Activity

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Rho Cas Activity

Postby Andrew Smith » Mon Dec 18, 2017 2:51 pm

I found the following paper A New outburst of the Yellow Hypergiant Star Rho Cas available here https://arxiv.org/pdf/1611.04493.pdf

I attach its Figure 1 which shows the development of the Fe I and Fe II lines at 6431 and 6433 respectively. I also attach my recent observation which shows it continues to develop.

Rho Cas Paper.png
Figure1 From Aret, Kraus, Kolka and Maravelias
Rho Cas Paper.png (111.73 KiB) Viewed 4317 times


rhocas_20171211_861_SAJB.png
Rho Cas SAJB
rhocas_20171211_861_SAJB.png (15.24 KiB) Viewed 4309 times


While all spectrographs have pros and cons the wide range and medium resolution of my MRes R ~ 10000 allows the following of several sets lines - even unplanned ones!

Regards Andrew

PS Re uploaded my file has I had shifted the spectra the wrong way to remove net RV of star of - 47Km/s
Last edited by Andrew Smith on Mon Dec 18, 2017 3:34 pm, edited 1 time in total.
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Re: Rho Cas Activity

Postby Olivier GARDE » Mon Dec 18, 2017 3:18 pm

HI Andrew,

Interesting study of this star.
I Will try as soon as possible (but actually, the weather is very bad here in south east of France...)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
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Re: Rho Cas Activity

Postby etienne bertrand » Mon Dec 18, 2017 6:00 pm

Ha is interested for this outburst ?
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Re: Rho Cas Activity

Postby Andrew Smith » Mon Dec 18, 2017 10:53 pm

Hi Etienne, I am not an expert on these stars having only just started to study them. H alpha is studied in these stars but mainly metal lines sensitive to the changing effective temperature.

There is a large literature on Rho Cas and the other bright yellow hypergiants as they suit the smaller observatories and PhD students. I have a pile of papers to read.

It looks like this outburst maybe coming to an end.

Regards Andrew
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Re: Rho Cas Activity

Postby Ernst Pollmann » Thu Apr 22, 2021 5:33 pm

Dear colleagues,
from 2011 to 2019 the yellow hyper giant rho Cas has been investigated by several ARAS observers.
Are there any unpublished summarises that has been not published in this forum?

Ernst Pollmann
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Re: Rho Cas Activity

Postby Ernst Pollmann » Thu May 27, 2021 11:19 am

... once again my question:
are there any summaries of the amateur observations relating to the several observations presented here?

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Re: Rho Cas Activity

Postby Ernst Pollmann » Mon Jun 07, 2021 5:28 pm

According Klochkova et al. (Astronomy Reports, 2018, vol. 62, No. 9)
Thus, the ejections in rho Cas are becoming more frequent. According: Astrophys. J, 583.923 and ASP conf. Ser. 508, 357, this may indicate that the star is approaching a crossing of the Yellow Void. This fact suggests the urgent need of further monitoring of rho Cas”
I tried by use spectra of the BAA data base (A. Smith, F. Sims, D. Boyd, J. Paraskeva) to find out something of the Hα radial velocity and the Hα equivalent width during Nov. 2017 to Sept. 2018 (see Fig. below).

The spectra have been evaluated for the Hα absorption and its blue-shifted PCyg-component.
By considering the RV and EW, it seems there has been an ejection within that time section. Both parameter of the Hα absorption seems to be confirmed to each other. Also the RV of the blue-shifted PCyg-component seems to confirm the ejection. Only its EW behavior do not fit to that event. Unfortunately there is a large gap of observations between Jan. to July 2018. If there further spectra of other observers available, it would be nice if I could receive these for further analysis.
Zusammenfassung.png
Zusammenfassung.png (112.82 KiB) Viewed 1352 times
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Re: Rho Cas Activity

Postby Ernst Pollmann » Sun Jun 13, 2021 12:31 pm

Newest observation of the star:
Zusammenfassung.png
Zusammenfassung.png (93.19 KiB) Viewed 1237 times


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Re: Rho Cas Activity

Postby Ernst Pollmann » Sat Jun 19, 2021 7:49 am

For interested observers:

https://www.aavso.org/aavso-alert-notice-746

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