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Sökning: onr:"swepub:oai:lup.lub.lu.se:ae8fb149-da38-49d3-bb06-b630eca875bd" > Estimating stellar ...
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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 05516naa a2200421 4500 | |
| 001 | oai:lup.lub.lu.se:ae8fb149-da38-49d3-bb06-b630eca875bd | |
| 003 | SwePub | |
| 008 | 190208s2019 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://lup.lub.lu.se/record/ae8fb149-da38-49d3-bb06-b630eca875bd2 URI |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2018332802 DOI |
| 040 | a (SwePub)lu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Howes, Louise M.u Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science4 aut0 (Swepub:lu)astr-lho |
| 245 | 1 0 | a Estimating stellar ages and metallicities from parallaxes and broadband photometry : Successes and shortcomings |
| 264 | c 2019-01-24 | |
| 264 | 1 | b EDP Sciences,c 2019 |
| 520 | a A deep understanding of the Milky Way galaxy, its formation and evolution requires observations of huge numbers of stars. Stellar photometry, therefore, provides an economical method to obtain intrinsic stellar parameters. With the addition of distance information - a prospect made real for more than a billion stars with the second Gaia data release - deriving reliable ages from photometry is a possibility. We have developed a Bayesian method that generates 2D probability maps of a star's age and metallicity from photometry and parallax using isochrones. Our synthetic tests show that including a near-UV passband enables us to break the degeneracy between a star's age and metallicity for certain evolutionary stages. It is possible to find well-constrained ages and metallicities for turn-off and sub-giant stars with colours including a U band and a parallax with uncertainty less than ∼20%. Metallicities alone are possible for the main sequence and giant branch. We find good agreement with the literature when we apply our method to the Gaia benchmark stars, particularly for turn-off and young stars. Further tests on the old open cluster NGC 188, however, reveal significant limitations in the stellar isochrones. The ages derived for the cluster stars vary with evolutionary stage, such that turn-off ages disagree with those on the sub-giant branch, and metallicities vary significantly throughout. Furthermore, the parameters vary appreciably depending on which colour combinations are used in the derivation. We identify the causes of these mismatches and show that improvements are needed in the modelling of giant branch stars and in the creation and calibration of synthetic near-UV photometry. Our results warn against applying isochrone fitting indiscriminately. In particular, the uncertainty on the stellar models should be quantitatively taken into account. Further efforts to improve the models will result in significant advancements in our ability to study the Galaxy. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a Galaxy: formation | |
| 653 | a Galaxy: stellar content | |
| 653 | a Hertzsprung-Russell and C-M diagrams | |
| 653 | a Methods: data analysis | |
| 653 | a Stars: evolution | |
| 653 | a Stars: fundamental parameters | |
| 700 | 1 | a Lindegren, Lennartu Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science4 aut0 (Swepub:lu)astr-lli |
| 700 | 1 | a Feltzing, Sofiau Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science4 aut0 (Swepub:lu)astr-sfe |
| 700 | 1 | a Church, Ross P.u Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science4 aut0 (Swepub:lu)astr-rch |
| 700 | 1 | a Bensby, Thomasu Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science4 aut0 (Swepub:lu)astr-tbe |
| 710 | 2 | a Astronomi - Genomgår omorganisationb Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation4 org |
| 773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 622q 622x 0004-6361x 1432-0746 |
| 856 | 4 | u http://dx.doi.org/10.1051/0004-6361/201833280y FULLTEXT |
| 856 | 4 | u http://arxiv.org/pdf/1804.08321 |
| 856 | 4 8 | u https://lup.lub.lu.se/record/ae8fb149-da38-49d3-bb06-b630eca875bd |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/201833280 |
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