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

TL;DR

This study provides detailed spectroscopic and photometric observations of two Mira variables, V667 Cassiopeiae and OR Cephei, analyzing their spectral classifications, flux variations, and color indices over a pulsation cycle.

Contribution

It offers new observational data and analysis of the spectral and photometric behavior of these specific Mira stars during their pulsation cycle.

Findings

Spectral classifications in the revised MK system for both stars.

Flux variations in H-alpha to H-delta emission lines with pulsation phase.

Photometric measurements of V and Ic magnitudes and V-Ic color index.

Abstract

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 colour index, classify spectra in the revised MK system and investigate how absolute flux in the H-alpha to H-delta emission lines varies with pulsation phase for each star.