Gaia Confirms that SDSS J102915+172927 is a Dwarf Star

Journal
Date Issued
2018
Author(s)
Bonifacio, P.
•
Caffau, E.
•
Spite, M.
•
Spite, F.
•
François, P.
•
•
Arenou, F.
•
Haigron, R.
•
Leclerc, N.
•
Marchal, O.
•
Panuzzo, P.
•
Plum, G.
•
Sartoretti, P.
DOI
Abstract
The Gaia Data Release 2 provides a parallax of 0.734+/-0.073 mas for SDSS J102915+172927, currently the most metal-poor known object. This parallax implies that it is dwarf star, ruling out the scenario that it is a subgiant. The subgiant scenario had as a corollary that the star had been formed in a medium highly enriched in C, thus making line cooling efficient during the collapse, that was also highly enriched in Fe by Type Ia SNe. This scenario can also now be ruled out for this star, reinforcing the need of dust cooling and fragmentation to explain its formation.
Volume
2
Issue
2
Start page
19
Uri
Url
Issn Identifier
2515-5172
Ads BibCode
2018RNAAS...2...19B
Rights
open.access
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