# TESS Program G07165

Title: Exploring Subdwarf B Star Binary Evolution Through Observational Studies

PI: Otani, Tomomi - Embry-Riddle Aeronautical University

Type: SMALL

Summary: The most promising formation scenarios for sdB stars involve binary evolutions through three different channels: 1) the Common Envelope channel, which produces short orbital period (P = 0.1-10 d) sdB binary systems; 2) the Roche Lobe Overflow channel, which results in long orbital period (450 < P < 1400 d) sdB binary systems; and 3) the white-dwarf merger channel, which produces single sdB stars. Observational studies of the orbital parameters of binaries with P > 100 d and the existence of single sdB stars are incomplete using the conventional methods, however, the pulsation timing method is suitable for research in these areas. Our group, which includes undergraduate students, will use this method to search for long-period subdwarf B (sdB) star binaries and single sdB stars.


# Sector 084 targets observed (2 min: 13, 20 s: 13)
336766344,7.2177,13.9129,16.06,G07165;G07167;20SECONDTARGET
197651594,336.6439,52.4439,15.42,G07165;G07167;20SECONDTARGET
2014259853,335.7464,51.6896,15.43,G07165;G07167;20SECONDTARGET
1981534143,303.5127,71.9773,16.66,G07165;G07167;20SECONDTARGET
279373920,324.5734,72.1857,11.63,G07165;G07167;G07160;20SECONDTARGET
364966239,298.212,58.1436,14.88,G07165;G07167;20SECONDTARGET
230008973,290.9915,60.8919,16.3,G07165;G07167;20SECONDTARGET
1271317081,259.2769,72.7659,16.63,G07165;G07167;20SECONDTARGET
229643707,279.7826,74.0234,16.52,G07165;G07167;20SECONDTARGET
236765572,273.5365,68.8101,16.02,G07165;G07167;20SECONDTARGET
356788459,268.9967,72.9623,16.36,G07165;G07167;20SECONDTARGET
199711557,253.7255,54.3411,15.52,G07165;G07167;20SECONDTARGET
199715319,254.4649,55.1924,16.0,G07165;G07167;20SECONDTARGET