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Monitoring infrared spectroscopy reveals molecular band changes in RW LMi, indicating formation within a dust envelope.
We present near-infrared spectroscopic monitoring of the carbon star RW LMi (2019–2024), revealing phase-dependent variations in molecular band depths and their anomalous behavior. Observations were obtained with the ASTRONIRCAM spectrograph on the 2.5-m telescope at the Caucasian Mountain Observatory. The detection of molecular bands across 1.1–2.3 μ m despite a dense, hot circumstellar dust envelope suggests their formation occurs within the envelope rather than in the stellar atmosphere.
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Vakhonin et al. (2025) studied this question.
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