Affiliation
American Association of Variable Star Observers (AAVSO)
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.
I wonder if dips like these are characteristic of these pulsating B stars or whether this is actually a binary as well?
Thanks for any help in my understanding.
Cliff
Cliff,
My guess is you are right, and it's an EA+LPB.
There is only one star flagged as such in the GCVS - V0539 Ara.
There are two stars flagged as EA+LPB: where of course the ":" implies uncertainty on the type of variability. They are mu Eri and IL CMa.
Cheers,
Roy