Short Period Pulsators (SPP)

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

6 28 By clkotnik 3 weeks 5 days ago

SPB LightCurve Question

Affiliation
American Association of Variable Star Observers (AAVSO)
clkotnik Sun, 02/07/2021 - 22:56

I was looking at some TESS light curves for variables of different types and happened upon this interesting LC for NSV 18243 which is a composite of TESS sectors 9, 10 and 11.  I did an analysis of the deep drops every 4 or so days and obtained the phase plot shown which combines the TESS data with Hipparcos.  For the TESS data, the dips look like an EA, but I do not see them in the Hipparcos data.  Note that the period determined from ASAS3 and Hipparcos is 0.527 d for this star and that period does also occur in TESS.

Light Curve Help

Affiliation
American Association of Variable Star Observers (AAVSO)
Bryanemartin Sat, 01/16/2021 - 23:54

Am learning the ropes and studying V0346 ORI.  I have attached a light curve and would appreciate any help.  In particular, the comp star 000-BKG-472 seems to have more variablity than my target.  I can not find additional info on 000-BKG-472.  Graph shows some seeing issues towards end of series.  Thanks

bryan e martin

V0346 ORI light curve

Period Luminosity Relation for RR Lyr

Affiliation
Astronomical Society of South Australia (ASSAU)
David Benn Sun, 10/04/2020 - 02:28

Hi all

At some point I want to extend the Leavitt's Law plugin in VStar to allow for distance to variable types other DCEP to be determined.

Here's a paper for RR Lyr period luminosity relations from 2004 (Catelan et al) :

https://www.researchgate.net/publication/1799435_The_RR_Lyrae_Period-Lu…

The authors provide I,J,H,K,V band specific PL relations involving P (period) and Z (metalicity).

Help Identifying Variable Type

Affiliation
American Association of Variable Star Observers (AAVSO)
clkotnik Sat, 06/27/2020 - 16:46

I am new to SPP and would appreciate help identifying a variable type.

HIP105217 is an 8.7 mag A9V star with the attached light curve.  The amplitude of variation (half full range) is 0.022 mag TESS.  A DCDFT analysis with VStar indicates two very dominate periods - 0.6150 and 0.5746 days.  With a bit of analysis (not shown) it seems to me that the light curve is very consistent with two sinusoidal waves with these periods alternately reinforcing and damping each other.

Welcome to the short period pulsators section

Affiliation
American Association of Variable Star Observers (AAVSO)
doctor13 Wed, 02/26/2020 - 19:08

This is just a welcome to those interested in exploring the nature of short period pulsating variable stars.  Historically this has primarily been Cepheids and RR Lyr.  Since my research interest is delta Scuti I hope to add a lot more targets of this type.  I also plan to add gamma Doradus, roAp stars, and perhaps information on white dwarf objects.  Some of these might be very challenging target. Finally, there is a chance to explore a potential new class of pulsating variable stars from their Fourier parameters.