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LPV Webinar - Miras from an Astrophysical Standpoint

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croberrw's picture
LPV Webinar - Miras from an Astrophysical Standpoint


Stan Walker of Variable Stars South has agreed to present on a topic he was originally going to give at VSS-6 via Zoom. 

We're going to present on Saturday June 6th at 2200 UTC. (6pm for those of us on the US east coat and early Sunday morning for Variable Star South members) 

The meeting link is here: 

Join Zoom Meeting

Meeting ID: 661 063 1137


I really appreciate Stan agreeing to do this. Hopefully people like this and we can schedule other observers/researchers willing to talk about thier work. 

As we're teleconferencing more and more, the opportunities to collaborate and share our knowledge with people around the world is truly exciting. 

Clear Skies!

Rich Roberts (RRIA)

croberrw's picture

Here is the outline for the talk. We plan to take a few minutes for questions in between each section. Each section is 2-3 slides

1.Introduction to pulsating variable stars

2.Double  Maxima  Miras  


4.Radial velocity measures 

5.BH Crucis  

6.R Centauri  

7.Observing the target stars 

8. Summary & Conclusions

croberrw's picture
Abstract for Presentation

One hundred and fifty years of intensive time series photometry  (TSP) of long period variables such as Mira stars have found less than a dozen stars with true long term changes – thus interest seems to be falling.   But amateurs now have access to equipment capable of measuring other aspects of these stars:  filters and detectors which allow UBRVI colour photometry, with extensions to JH and K passbands;  spectroscopic equipment capable of measuring  radial velocities accurately;  all of which can be combined with satellite measures of distance and other things.


This project is largely based upon the known attributes of two Mira stars which have shown two maxima per cycle.  There are similar stars where detailed study of the astrophysical aspects would be valuable.  When successful results are obtained these can be used as a template for observing the full range of long period cool stars – Miras, SR stars and similar objects.  This provides a raison d’ệtre for amateur measures of these stars for the next century, even though the increasing number of surveys may relegate TSP to  a role comprising data-mining of these surveys.

Mark Blackford
Mark Blackford's picture
LPV Webinar

Hi Rich and Stan,

It was disappointing that Stans's talk, and the entire Variable Stars South Symposium, had to be cancelled due to the Covid-19 travel restrictions. So I was pleased to hear that this LPV Webinar was being planned. I'm really looking forward to it. Cheers,


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