AAVSO: American Association of Variable Star Observers

Multiwavelength Observations of the Eclipsing Binary NSV 3438 between January 2013 and March 2016 (Abstract)

Volume 45 number 2 (2017)

Carter M. Becker
Desert Pass Observatory, Green Valley, AZ; Cbecker310@aol.com

Abstract

(Abstract only) The eclipsing binary NSV 3438 in Canis Minor consists of two M-type stars having approximate effective temperatures of 3235 K (M4V) and 2898 K (M6V). The period for a cycle during this study was 1.535 days, essentially unchanged from that reported in 1996. A modification of the bisected chord method provides estimates of mid-eclipse Julian Dates with 95% confidence limits for 22 primary and 29 secondary eclipses. The mean depths of primary and secondary eclipses with filter B are 0.69 and 0.62 magnitude, respectively, and 0.65 and 0.61 magnitude, respectively for filter V. APASS standard stars closely associated with NSV 3438 provide a means of determining the magnitude of NSV 3438. In addition, B–V color indexes and effective temperatures of the binary can be assessed at critical stages throughout the eclipse cycle.