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Spectroscopic and Photometric Study of the S-type Mira V667 Cassiopeiae and the Carbon Star OR Cephei

Boyd, D.

We report on spectroscopic and photometric observations of the S-type Mira V667 Cas and the carbon star Mira OR Cep recorded during one pulsation cycle of each star in 2022. Spectra are calibrated in absolute flux using concurrent photometry. We present measurements of V and Ic magnitudes and V-Ic color index, classify spectra in the revised MK sy…

Photometric Distance of the RR Lyrae Star SU Draconis using Period-Luminosity-Metallicity Relationships

Davis, J.; Baltich, B.; Siaw, K. +2 more

The distance to the RR Lyrae Star SU Draconis was estimated via photometric analysis using period-luminosity-metallicity equations from Cáceres and Catelan, as well as Garofalo's luminosity-metallicity equation. Exposures were taken in the B, V, i, and z bands over a two-week period (65 exposures per band). Photometry files from the cadence were a…

Investigation of the M13 Globular Cluster: Characteristics and Pulsation Periods of Its RR Lyrae Stars V8, V31, and V54

Wang, J.; Lee, K.; Tock, K. +2 more

Images of the Messier 13 (M13/NGC 6205) globular cluster were requested from the Las Cumbres Global Observatory's 40-centimeter telescope to investigate the chemical composition and characteristics of the cluster along with three of its RR Lyrae variable stars. Gaia Data Release 3 data were used to fit an isochrone by varying parameters such as di…