Astron. J., 163, 180-180 (2022/April-0)
Nine Bright γ Doradus Variables Discovered with Ground-based Photometry.
HENRY G.W., FEKEL F.C. and WILLIAMSON M.H.
Abstract (from CDS):
We have used precise photometric and high-dispersion spectroscopic observations to study nine candidate γ Doradus (γ Dor) stars, identified as optically variable comparison stars in our photometric studies of Sun-like stars. In this paper, we confirm these nine candidates as new γ Dor variables. All exhibit sinusoidal variability with amplitudes between 6 and 65 mmag in Johnson B and periods from 0.28 to 1.13 days. All lie in the same region of the H-R diagram as our previously confirmed γ Dor stars. Of the nine systems, one is a single-lined spectroscopic binary (SB1), two are double-lined spectroscopic binaries (SB2), and the remaining six are single stars. We present orbits for the three binary systems: HD 34415, HD 144839, and HD 182735. Their periods are 6400 days or 17.5 yr (adopted), 995 ± 7 days, and 1052.4 ± 0.2 days, respectively. We compare our photometric periods with those we derive for six of the nine stars observed with the Transiting Exoplanet Survey Satellite to strengthen the confirmation of these new γ Dor variables. Finally, because the distribution of γ Dor stars in the H-R diagram overlaps with the red edge of the δ Scuti (δ Sct) instability strip, we use our ground-based photometric results for the 73 γ Dor stars confirmed with our Automatic Photoelectric Telescopes over the past two decades to look at the incidence of hybrid δ Sct/γ Dor stars; these are highly valuable targets for asteroseismology.
© 2022. The Author(s). Published by the American Astronomical Society.
Gamma Doradus variable stars - Early-type stars - Fundamental parameters of stars - Stellar oscillations - Radial velocity - Spectroscopic binary stars - Stellar photometry - Period determination
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<Available at CDS (J/AJ/163/180): table1.dat table3.dat table5.dat table7.dat table10.dat>
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