Short Period Pulsators (SPP)

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

29 134 By SHA 1 week 5 days ago

SPP Newsletter begun

American Association of Variable Star Observers (AAVSO)
SHA Wed, 03/13/2024 - 17:26

We have started a newsletter for the SPP section.  The first issue can be found under "SPP Newsletter" on the menu at the SPP section home page.  Let me know what you think (my email is in the newsletter).  What would you like to see in future SPP newsletters?  Would you like to have new newsletters emailed to you instead of posted?  If you have something to add to a future newsletter, please email me. The intent is to improve communications among those interested in the SPP section and spread word about interesting targets. -- Horace Smith 

TZ Aur Ephemeris entry

American Association of Variable Star Observers (AAVSO)
btschumy Fri, 02/02/2024 - 18:54

I've been trying to collect data on TZ Aur and capture the entire light cure myself.  I have everything except for a couple of hours around its peak. I tried to get the final section last night using the 2024 RR Lyrae Ephemeris (  Unfortunately, it appears I caught the downward section after the  peak.  I'm trying to understand where I went wrong.

There are two entries to consider in the February section for TZ Aur:

Day     Peak

1- 2     8.5 

2- 3     3.5

DSCTs in TESS data

American Association of Variable Star Observers (AAVSO)
Degen1103 Sat, 12/16/2023 - 12:01

In work Periodic variable A-F spectral type stars in the northern TESS continuous viewing zone TESS data were investigated within circle R 15 deg around north ecliptic pole in Draco. Authors conclude:
We found clear signs of variability in 3025 of 5923 studied stars (51 %). For 1813 of these 3025 stars, we provide a classification. From the classified stars, 64.5 % are pulsating stars of GDOR and DSCT types and their hybrids. 

Strange light curves for Tyc 3603-1124-1

W. Allen Gilchrist Tue, 09/19/2023 - 00:44

I've taken over 1400 B- and V-filter CCD photometric measurements of Tyc 3603-1124-1 beginning in September, 2021 and continuing within the last month.  The results look very strange to me.  VSX lists the star as a HADS variable, but the rise to brightness is slower than the fall.  PTD analysis yields a period, P=0.1359594542 d, very close to the value listed in VSX, P = 0.1359594542 d.  Fourier analysis results show only a fundamental f

New work on Polaris

American Association of Variable Star Observers (AAVSO)
bskiff Mon, 09/11/2023 - 01:34

     If anyone needs inspiration to observe (or continue observing) Polaris, a new paper by Willy Torres (Harvard) that appeared on astro-ph late last week may provide it:

Though this deals mainly with the radial velocities, it is clear that high-quality photometry remains useful, and is analyzed here in context with the rv's.  The introduction of the paper provides a comprehensive overview of the observational history of the star.  The writing, data analysis etc in this paper are fabulous, and characteristic of Torres' work.

Classification of CSS_J032404.3+211344

American Association of Variable Star Observers (AAVSO)
astrobrandx Wed, 06/28/2023 - 08:46

I am studying CSS_J032404.3+211344 for my master's project and trying to find a clear classification for it.

I chose this target rather arbitrarily based on observability for the Liverpool Telescope (LT) over a period last year and have some limited observations (16 each in g and r band) from whch I have done some basic analysis.  I found out there is some good V-band photometry data in the ASA-SN catalogue: 

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.