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Chemical Abundances of the Typhon Stellar Stream by Ji, Alexander P.; Naidu, Rohan P.; Brauer, Kaley; Ting, Yuan-Sen; Simon, Joshua D. is a scholarly article available to read on EtoBox.

What is Chemical Abundances of the Typhon Stellar Stream about?

We present the first high-resolution chemical abundances of seven stars in the recently discovered high-energy stream Typhon. Typhon stars have apocenters >100 kpc, making this the first detailed chemical picture of the Milky Way's very distant stellar halo. Though the sample size is limited, we find that Typhon's chemical abundances are more like a dwarf galaxy than a globular cluster, showing a metallicity dispersion and no presence of multiple stellar populations. Typhon stars display enhanced $\alpha$-element abundances and increasing r-process abundances with increasing metallicity. The high-$\alpha$ abundances suggest a short star formation duration for Typhon, but this is at odds with expectations for the distant Milky Way halo and the presence of delayed r-process enrichment. If the progenitor of Typhon is indeed a new dwarf galaxy, possible scenarios explaining this apparent contradiction include a dynamical interaction that increases Typhon's orbital energy, a burst of enhanced late-time star formation that raises [$\alpha$/Fe], and/or group preprocessing by another dwarf galaxy before infall into the Milky Way. Alternatively, Typhon could be the high-energy tail of a mor

Author

Ji, Alexander P.; Naidu, Rohan P.; Brauer, Kaley; Ting, Yuan-Sen; Simon, Joshua D.

Published

2022

Language

EN