The Galactic Oosterhoff Dichotomy in terms of Period-Color Relations at Maximum/Minimum Light
Shashi Kanbur (1), Ata Sarajedini (2), Karen Kinemuchi (3), Roger, Cohen (2), and Chow Choong Ngeow (4) ((1) SUNY Oswego, NY (2) University of, Florida (3) NASA-Ames Research Center/Bay Area Environmental Research, Institute, (4) National Central University, Taiwan)
TL;DR
This paper investigates the differences in period-color relations at maximum and minimum light between Oosterhoff type I and II globular clusters, providing new insights into their RR Lyrae star characteristics.
Contribution
It introduces a novel analysis of period-color relations at maximum and minimum light to distinguish between Oosterhoff types in globular clusters.
Findings
Period-color relations differ at maximum light between OoI and OoII clusters.
The study demonstrates the utility of multicolor data in classifying Oosterhoff types.
Highlights the importance of light phase in understanding RR Lyrae properties.
Abstract
The Galactic Oosterhoff dichotomy between Galactic globular clusters of type I (OoI) and type II (OoII) is often characterized by a difference in the period-amplitude (PA) relations displayed by RR Lyrae ab stars in each type of cluster. Classical examples of OoI and OoII are M3 and M15 respectively. Here we use multicolor data for the these two clusters to demonstrate how period-color (PC) relations at maximum V-band light are also different in OoI and OoII clusters.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Optical Polarization and Ellipsometry