Informace o publikaci

An analysis of four stellar rings

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PAUNZEN Ernst FLORIAN Jan GUTL-WALLNER Anna HERDIN Andreas KRALOFSKY Erwin LESCHINSKI Kieran MACH Michael MAITZEN Hans-Michael PRIŠEGEN Michal ROCKENBAUER Markus RODE-PAUNZEN Monika WALLNER Stefan

Druh Článek v odborném periodiku
Časopis / Zdroj Astronomische Nachrichten
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Doi http://dx.doi.org/10.1002/asna.201913547
Klíčová slova galaxy: structure; ISM: bubbles; open clusters and associations: general; stars: early-type
Popis About 50 years ago, one thousand ring-like structures (called stellar-rings) were discovered by Isserstedt (1968). They were believed to be groups of young stars formed by shell-like triggered star formation, which would make them excellent tracers of spiral arms, for example. Neglected for 40 years, we used highly accurate kinematic, astrometric, and photometric data to investigate the four most prominent stellar rings. The aim is to investigate if those structures are indeed physically related groups of stars. We used proper motions and parallaxes from the Gaia DR2 to calculate distances and to search for common properties. Color-magnitude diagrams using BVJHK(s) measurements were investigated and isochrones fitted. None of the four stellar rings consists of a physically related group of young stars. The location of stars in the line-of-sight mimics a ring-like structure on the sky. The color-magnitude diagrams are typical for an integrated field population and not for a young star cluster, for example. The currently available data are sufficient to analyze ring-like structures with a high statistical significance. This allows a new search for such structures in the Milky Way.