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CCD Photometry, Light Curve Modeling, and Period Study of the Overcontact Binary Systems V647 Virginis and V948 Monocerotis
Alton, K. B.
Prior to this investigation, monochromatic CCD data for V647 Vir and V948 Mon had only been generated from automated surveys which employ sparse sampling strategies. In this study precise multi-color (B, V, and Ic) light curve data for V647 Vir (2018) and V948 Mon (2017-2018) were acquired at Desert Bloom Observatory (DBO). Both targets…
CCD Photometry, Light Curve Deconvolution, Period Analysis, Kinematics, and Evolutionary Status of the HADS Variable V460 Andromedae
Alton, K. B.; Stepien, K.
Multi-color (BVIc) CCD-derived photometric data were acquired from V460 And, an intrinsic variable classically defined as a High Amplitude delta Scuti (HADS) type system. Deconvolution of precise time-series light curve data was accomplished using discrete Fourier transformation and revealed a fundamental mode (f0) of oscillation at 13.336 d-1 alo…
A Photometric Study of the Contact Binary V384 Serpentis
Michaels, E. J.; Lanning, C. M.; Self, S. N.
In this paper we present the first photometric light curves in the Sloan g', r', and i' passbands for the contact binary V384 Ser. Photometric solutions were obtained using the Wilson-Devinney program which revealed the star to be a W-type system with a mass ratio of q = 2.65 and a f = 36% degree of contact. The less massive component was found to…
SSA Analysis and Significance Tests for Periodicity in S, RS, SU, AD, BU, KK, and PR Persei
Chaplin, G. B.
Visual observations made by experienced observers are adjusted for individual observer bias. We examine the time series using signal processing methods to identify periodicities and test for the significance of the results finding a reliable periods in S Per, and to a limited extent in RS, SU, BU, and KK Per. Recommendations for future visual and …
Discovery and Period Analysis of Seven Variable Stars
Polakis, T.
Tens of thousands of images have been acquired during the course of asteroid photometry observations at Command Module Observatory (MPC V02). Nightly sets of these images were analyzed using a software routine that locates field stars whose brightness shows anomalously high photometric scatter. A total of 32 variable stars were identified by this …
Multi-color Photometry of the Hot R Coronae Borealis Star and Proto-planetary Nebula V348 Sagittarii
Landolt, A. U.; Clem, J. L.
A long term program of precision photoelectric UBVRI photometry has been combined with AAVSO archival data for the hot, R CrB-type hydrogen deficient star and proto-planetary nebula, V348 Sgr. CCD data also are described. Since V348 Sgr is one of only four hot R CrB stars, it and other group members deserve continued attention by observers.