AAVSO: American Association of Variable Star Observers

Radial Velocities for Four δ Sct Variable Stars

Volume 47 number 1 (2019)

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Elizabeth J. Jeffery
Physics Department, California Polytechnic State University, San Luis Obispo, CA 93407; elizabeth.j.jeffery@gmail.com
Thomas G. Barnes III
The University of Texas at Austin, McDonald Observatory, 1 University Station, C1402, Austin, TX 78712; tgb@astro.as.utexas.edu
Ian Skillen
Isaac Newton Group, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Canary Islands, Spain; wji@ing.iac.es
Thomas J. Montemayor
The University of Texas at Austin, McDonald Observatory, 1 University Station, C1402, Austin, TX 78712; tjm@texas.net

Abstract

We report 124 radial velocities for the δ Sct variable stars VZ Cnc, AD CMi, DE Lac, and V474 Mon, covering full pulsation cycles. Although we also obtained data on KZ Hya, the signal-to-noise ratios of those spectra were too low to determine meaningful velocities. We confirm the multi-periodic behavior of both VZ Cnc and V474 Mon. However, our data do not cover a long enough baseline to address the multi-periodic nature of AD CMi claimed by Derekas et al. (2009). Our velocities, added to those in the literature for DE Lac, suggest discordant center-of-mass velocities, but the data are few.