Short Period Pulsators (SPP)

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Information on the Observation and analysis of short period pulsators such as Cepheids and RR Lyrae.

23 106 By weo 3 days 17 hours ago

CHOICE course on Variable Star Classification/Light Curves

American Association of Variable Star Observers (AAVSO)
weo Wed, 05/31/2023 - 21:06

(SPP forum)

  • Are you trying to determine what type of variable star you are looking at?
  • Interested in data mining but don't know the basics about variables?
  • New to variable stars and want to learn about the types AAVSOers observe?

There are spaces available in the excellent AAVSO CHOICE course "Variable Star Classification and Light Curves". This course, taught by Blake Crosby,
begins Monday, June 5, and runs through July 2. Register before June 4.

DCEPs - Observing Bright DCEPs

American Association of Variable Star Observers (AAVSO)
YPFA Wed, 02/15/2023 - 00:42

I would like to make some observations of T Mon (6.62-5.58V) and RT Aur (5.82-5.0V) and capture them on a CCD.

For various reasons (including availability of filters) I have opted to use iTelescope's T5, which is located in Utah, and uses a Takahashi Epsilon 250 (presumably 10-inches of aperture). The attached camera is an SBIG ST-10XME.  

Question about "2023 AAVSO RR Lyrae Ephemeris"

American Association of Variable Star Observers (AAVSO)
btschumy Sun, 02/05/2023 - 15:34

I was trying to use the SPP RR Lyrae Ephemeris of plan an imaging session.  I can't see how the predicted "time of maximum" lines up with the ephemeris you get from VSX.

For example, I was considering RR Gem for tonight.  Here is what the SPP ephemeris says for the days around tonight (Feb 5th in local time)

4-5     7.0

5-6     2.0

6-7     6.5

I would think I would use the 5-6 line and in my time zone (-7 UTC), that would be 7 PM on the 5th.

However, if I look at the VSX ephemeris, I see:

2459980.345   04 Feb 2023 20:16

Absolute Magnitude determination for Delta Scuti variables

American Association of Variable Star Observers (AAVSO)
PaviKSH Wed, 11/16/2022 - 19:19

I've tried to use the Period-Luminosity relation formula which I found on " " but it seems to be quite unaccurate. Do you have some other more precise way to calculate the absolute magnitude of a Delta Scuti variable?


Cepheid Images needed for photometry & period determination

American Association of Variable Star Observers (AAVSO)
PaviKSH Wed, 11/09/2022 - 11:08

I'm working on a school project and I have to determine periods of different types of variable stars in order to calculate the distance. For this reason I am looking for images of different variables stars like Cepheids and eclipsing binaries. A data set with at least two visible visible peaks is needed and the more images you have the better! All kind of Cepheids are welcome, stars like RR-Lyrae-type, Mira-type, long period/short period, delta-scuti-stars.

I'm really thankful for any data set you are able to provide.

AstroImageJ now supports generation of variable star reports

American Association of Variable Star Observers (AAVSO)
dennis-conti Mon, 10/03/2022 - 17:06

For those of you who are familiar with AstroImageJ (AIJ), a capability has been added to the latest daily build that allows the user to create a variable star report that conforms with the AAVSO International Database (AID) format for both single comparison stars, as well as for an ensemble of comparison stars. I want to thank Ken Menzies and others who have helped with the testing.

V338 Boo campaign - Alert Notice 786

American Association of Variable Star Observers (AAVSO)
weo Tue, 07/12/2022 - 14:59

AAVSO Alert Notice 786 announces an observing campaign on the RR Lyr star V338 Boo. Please see the notice for details and observing instructions.

There are threads for this campaign under the following forums:

- Campaigns and Observing Reports:
- Short Period Pulsators (SPP):

Question about Epsilon Cephei

American Association of Variable Star Observers (AAVSO)
Elisabeth Atems Thu, 07/07/2022 - 18:50

I'm not sure whether this is the correct forum for this question, but Eps Cep is a SPP (a Delta Scuti), so here goes... please note that I am new to photometry and am just trying to practice on some well-known variables, the eventual goal being to study exoplanet transits.