TYC 5353-1137-1: an enigmatic Double Periodic Variable of semiregular amplitude

TL;DR

This paper identifies a new candidate Double Periodic Variable with a decreasing mean brightness and increasing amplitude over time, using data from the ASAS catalog and period analysis tools.

Contribution

It presents the discovery and analysis of a new DPV candidate with unique brightness variation characteristics, expanding the known sample of such variables.

Findings

Gradual decrease in mean brightness over 2500 days

Significant increase in brightness variation amplitude in last 1000 days

Orbital period determined with PDM software

Abstract

We have performed a new search for DPVs of short period in the ASAS catalog (Pojmanski, G., 1997), focusing on those stars with orbital periods between 2 to 3 days which also show variations in their brightness. From a total of 244 objects, we have found another candidate to DPV, one whose mean brightness is gradually decreasing. By fitting a 3rd order polynomial to the mean magnitude and then moving it to zero for a second analysis, a gradual decrease over 2500 days was revealed. During the last 1000 days of this decrease, a 42% increase in the variation between the minimum and maximum values of the magnitude was observed. We determined the orbital period by using the PDM IRAF software (Stellingwerf 1978) and estimated the errors for the orbital period and long cycle by visual inspection of the light curves phased with trial periods near the minimum of the periodogram given by PDM.