Kavli Affiliate: George Ricker
| First 5 Authors: Rahul Jayaraman, Saul Rappaport, Lorne Nelson, Donald W. Kurtz, George Dufresne
| Summary:
Using the novel TESS 20-sec cadence data, we have discovered an unusual
combination of pulsating stars in what we infer to be a binary system. The
primary is a standard $delta$ Scuti star with pulsations over the range 32-41
d$^{-1}$; this is in an inferred wide orbit with a hot subdwarf B (sdB)
secondary, which itself has a large-amplitude p-mode pulsation at 524 d$^{-1}$.
We establish constraints on the period of the putative binary by using radial
velocity measurements of the $delta$ Scuti star and show that any sdB-mass
companion star must have an orbital period greater than $sim 35$ d. Our
identification of this sdB binary serves as an important addition to the
relatively small amount of sdB binaries known to have a period longer than a
few days. We show that such a binary can be formed through stable,
nonconservative mass transfer, without undergoing a common envelope phase.
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