A new sample of extremely/ultra metal-poor stars

A E Garcia Perez; N Christlieb; Sean G Ryan; Timothy C Beers; Wako Aoki; Martin Asplund; Paul S Barklem; Mike Bessell; Kjell Eriksson; Anna Frebel; Bengt Gustafsson; A J Korn; B Nordstrom; John Norris

doi:10.1088/0031-8949/2008/T133/014036

A new sample of extremely/ultra metal-poor stars

A E Garcia Perez, N Christlieb, Sean G Ryan, Timothy C Beers, Wako Aoki, Martin Asplund, Paul S Barklem, Mike Bessell, Kjell Eriksson, Anna Frebel, Bengt Gustafsson, A J Korn, B Nordstrom, John Norris

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

7 Citations (Scopus)

Abstract

A sample of 30 very metal-poor stars from the Hamburg-European Southern Observatory (ESO) objective-prism survey have been observed at high spectral resolution at the Very Large Telescope (VLT) using the Ultraviolet and Visual Echelle Spectrograph (UVES). Two of the observed stars are very interesting not only because of their very low iron content, approximately four orders of magnitude lower than the solar value, but also because we detected the neutral lithium resonance line at 670.8 nm. Hydrogen lines suggest that the two observed stars have effective temperatures around 6000-6250 K and according to isochrones, they are either on the main-sequence or on the subgiant branch, in which case they would probably be the most metal-poor dwarfs or warm subgiants with lithium detections known. These detections would allow to determine more accurately the slope of the trend of the lithium abundance with [Fe/H] than was possible with samples of unevolved stars restricted to higher metallicities.

Original language	English
Title of host publication	Physica Scripta, Volume T133
Place of Publication	UK
Publisher	IOP Publishing
Pages	014036
Edition	peer reviewed
DOIs	https://doi.org/10.1088/0031-8949/2008/T133/014036
Publication status	Published - 2008
Event	A Stellar Journey: A symposium in Celebration of Bengt Gustafsson's 65th Birthday - Uppsala Sweden Duration: 1 Jan 2008 → … http://iopscience.iop.org/1402-4896/2008/T133

Publication series

Name
Number	1
Volume	133

Conference

Conference	A Stellar Journey: A symposium in Celebration of Bengt Gustafsson's 65th Birthday
Period	1/01/08 → …
Other	June 23-27 2008
Internet address	http://iopscience.iop.org/1402-4896/2008/T133

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Garcia Perez, A. E., Christlieb, N., Ryan, S. G., Beers, T. C., Aoki, W., Asplund, M., Barklem, P. S., Bessell, M., Eriksson, K., Frebel, A., Gustafsson, B., Korn, A. J., Nordstrom, B., & Norris, J. (2008). A new sample of extremely/ultra metal-poor stars. In Physica Scripta, Volume T133 (peer reviewed ed., pp. 014036). IOP Publishing. https://doi.org/10.1088/0031-8949/2008/T133/014036

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title = "A new sample of extremely/ultra metal-poor stars",

abstract = "A sample of 30 very metal-poor stars from the Hamburg-European Southern Observatory (ESO) objective-prism survey have been observed at high spectral resolution at the Very Large Telescope (VLT) using the Ultraviolet and Visual Echelle Spectrograph (UVES). Two of the observed stars are very interesting not only because of their very low iron content, approximately four orders of magnitude lower than the solar value, but also because we detected the neutral lithium resonance line at 670.8 nm. Hydrogen lines suggest that the two observed stars have effective temperatures around 6000-6250 K and according to isochrones, they are either on the main-sequence or on the subgiant branch, in which case they would probably be the most metal-poor dwarfs or warm subgiants with lithium detections known. These detections would allow to determine more accurately the slope of the trend of the lithium abundance with [Fe/H] than was possible with samples of unevolved stars restricted to higher metallicities.",

author = "{Garcia Perez}, {A E} and N Christlieb and Ryan, {Sean G} and Beers, {Timothy C} and Wako Aoki and Martin Asplund and Barklem, {Paul S} and Mike Bessell and Kjell Eriksson and Anna Frebel and Bengt Gustafsson and Korn, {A J} and B Nordstrom and John Norris",

year = "2008",

doi = "10.1088/0031-8949/2008/T133/014036",

language = "English",

publisher = "IOP Publishing",

number = "1",

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booktitle = "Physica Scripta, Volume T133",

edition = "peer reviewed",

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Garcia Perez, AE, Christlieb, N, Ryan, SG, Beers, TC, Aoki, W, Asplund, M, Barklem, PS, Bessell, M, Eriksson, K, Frebel, A, Gustafsson, B, Korn, AJ, Nordstrom, B & Norris, J 2008, A new sample of extremely/ultra metal-poor stars. in Physica Scripta, Volume T133. peer reviewed edn, IOP Publishing, UK, pp. 014036, A Stellar Journey: A symposium in Celebration of Bengt Gustafsson's 65th Birthday, 1/01/08. https://doi.org/10.1088/0031-8949/2008/T133/014036

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T1 - A new sample of extremely/ultra metal-poor stars

AU - Garcia Perez, A E

AU - Christlieb, N

AU - Ryan, Sean G

AU - Beers, Timothy C

AU - Aoki, Wako

AU - Asplund, Martin

AU - Barklem, Paul S

AU - Bessell, Mike

AU - Eriksson, Kjell

AU - Frebel, Anna

AU - Gustafsson, Bengt

AU - Korn, A J

AU - Nordstrom, B

AU - Norris, John

PY - 2008

Y1 - 2008

N2 - A sample of 30 very metal-poor stars from the Hamburg-European Southern Observatory (ESO) objective-prism survey have been observed at high spectral resolution at the Very Large Telescope (VLT) using the Ultraviolet and Visual Echelle Spectrograph (UVES). Two of the observed stars are very interesting not only because of their very low iron content, approximately four orders of magnitude lower than the solar value, but also because we detected the neutral lithium resonance line at 670.8 nm. Hydrogen lines suggest that the two observed stars have effective temperatures around 6000-6250 K and according to isochrones, they are either on the main-sequence or on the subgiant branch, in which case they would probably be the most metal-poor dwarfs or warm subgiants with lithium detections known. These detections would allow to determine more accurately the slope of the trend of the lithium abundance with [Fe/H] than was possible with samples of unevolved stars restricted to higher metallicities.

AB - A sample of 30 very metal-poor stars from the Hamburg-European Southern Observatory (ESO) objective-prism survey have been observed at high spectral resolution at the Very Large Telescope (VLT) using the Ultraviolet and Visual Echelle Spectrograph (UVES). Two of the observed stars are very interesting not only because of their very low iron content, approximately four orders of magnitude lower than the solar value, but also because we detected the neutral lithium resonance line at 670.8 nm. Hydrogen lines suggest that the two observed stars have effective temperatures around 6000-6250 K and according to isochrones, they are either on the main-sequence or on the subgiant branch, in which case they would probably be the most metal-poor dwarfs or warm subgiants with lithium detections known. These detections would allow to determine more accurately the slope of the trend of the lithium abundance with [Fe/H] than was possible with samples of unevolved stars restricted to higher metallicities.

U2 - 10.1088/0031-8949/2008/T133/014036

DO - 10.1088/0031-8949/2008/T133/014036

M3 - Conference contribution

SP - 014036

BT - Physica Scripta, Volume T133

PB - IOP Publishing

CY - UK

T2 - A Stellar Journey: A symposium in Celebration of Bengt Gustafsson's 65th Birthday

Y2 - 1 January 2008

ER -

A new sample of extremely/ultra metal-poor stars

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