The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration

Randich, S.; Tognelli, E.; Jackson, R.; Jeffries, R.D.; Degl’Innocenti, S.; Pancino, E.; Re Fiorentin, P.; Spagna, A.; Sacco, G.; Bragaglia, A.; Magrini, L.; Prada Moroni, P.G.; Alfaro, E.; Franciosini, E.; Morbidelli, L.; Roccatagliata, V.; Bouy, H.; Bravi, L.; Jiménez-Esteban, F.M.; Jordi, C.; Zari, E.; Tautvaišiene, G.; Drazdauskas, A.; Mikolaitis, S.; Gilmore, G.; Feltzing, S.; Vallenari, A.; Bensby, T.; Koposov, S.; Korn, A.; Lanzafame, A.; Smiljanic, R.; Bayo, A.; Carraro, G.; Costado, M.T.; Heiter, U.; Hourihane, A.; Jofré, P.; Lewis, J.; Monaco, L.; Prisinzano, L.; Sbordone, L.; Sousa, S.G.; Worley, C.C.; Zaggia, S.

doi:10.1051/0004-6361/201731738

The Gaia-ESO survey: A lithium depletion boundary age for NGC 2232 (2021)
Journal Article
Binks, A. S., Jeffries, R. D., Jackson, R. J., Franciosini, E., Sacco, G. G., Bayo, A., …Zaggia, S. (2021). The Gaia-ESO survey: A lithium depletion boundary age for NGC 2232. Monthly Notices of the Royal Astronomical Society, 505(1), 1280-1292

Astrometry and photometry from {\it Gaia} and spectroscopic data from the {\it Gaia}-ESO Survey (GES) are used to identify the lithium depletion boundary (LDB) in the young cluster NGC 2232. A specialised spectral line analysis procedure was used to... Read More about The Gaia-ESO survey: A lithium depletion boundary age for NGC 2232.

The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35 (2020)
Journal Article
Jeffries, R. D., Jackson, R. J., Sun, Q., & Deliyannis, C. P. (2021). The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35. Monthly Notices of the Royal Astronomical Society, 500(1), 1158-1177. https://doi.org/10.1093/mnras/staa3141

New fibre spectroscopy and radial velocities from the WIYN telescope are used to measure photospheric lithium in 242 high-probability, zero-age-main-sequence (ZAMS) F- to K-type members of the rich cluster M35. Combining these with published rotation... Read More about The effects of rotation on the lithium depletion of G- and K-dwarfs in Messier 35.

The Gaia-ESO Survey: Galactic evolution of lithium at high metallicity (2020)
Journal Article
Jeffries, R., & Wright, N. J. (2020). The Gaia-ESO Survey: Galactic evolution of lithium at high metallicity. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/202038688

Context. Reconstructing the Galactic evolution of lithium (Li) is the main tool used to constrain the source(s) of Li enrichment in the Galaxy. Recent results have suggested a decline in Li at supersolar metallicities, which may indicate reduced prod... Read More about The Gaia-ESO Survey: Galactic evolution of lithium at high metallicity.

The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc (2020)
Journal Article
Jeffries. (2020). The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202038055

Context. In the era of large spectroscopic surveys, massive databases of high-quality spectra coupled with the products of the Gaia satellite provide tools to outline a new picture of our Galaxy. In this framework, an important piece of information i... Read More about The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc.

The Gaia-ESO Survey: Membership probabilities for stars in 32 open clusters from 3D kinematics (2020)
Journal Article
Jeffries, & Wright. (2020). The Gaia-ESO Survey: Membership probabilities for stars in 32 open clusters from 3D kinematics. Monthly Notices of the Royal Astronomical Society, 4701-4716. https://doi.org/10.1093/mnras/staa1749

The Gaia-ESO Survey (GES) observed many open clusters as part of its programme to spectroscopically characterise the various Milky Way populations. GES spectroscopy and Gaia astrometry from its second data release are used here to assign membership p... Read More about The Gaia-ESO Survey: Membership probabilities for stars in 32 open clusters from 3D kinematics.

The dynamics of the γ Vel cluster and nearby Vela OB2 association (2020)
Journal Article
Armstrong, J. J., Wright, N., Jeffries, R., & Jackson, R. J. (2020). The dynamics of the γ Vel cluster and nearby Vela OB2 association. Monthly Notices of the Royal Astronomical Society, 494(4), 4794 -4801. https://doi.org/10.1093/mnras/staa939

The kinematics of low-mass stars in nearby OB associations can provide clues about their origins and evolution. Combining the precise positions, proper motions, and parallaxes given in the second Gaia Data Release with radial-velocity measurements ob... Read More about The dynamics of the γ Vel cluster and nearby Vela OB2 association.

A kinematically hot population of young stars in the solar neighbourhood (2020)
Journal Article
Binks, A., Wright, N., & Jeffries, R. (2020). A kinematically hot population of young stars in the solar neighbourhood. Monthly Notices of the Royal Astronomical Society, 494(2), 2429-2439. https://doi.org/10.1093/mnras/staa909

In the last three decades several hundred nearby members of young stellar moving groups (MGs) have been identified, but there has been less systematic effort to quantify or characterise young stars that do not belong to previously identified MGs. Usi... Read More about A kinematically hot population of young stars in the solar neighbourhood.

The Gaia-ESO Survey: detection and characterisation of single-line spectroscopic binaries (2020)
Journal Article
Merle, T., Van der Swaelmen, M., Van Eck, S., Jorissen, A., Jackson, R. J., Traven, G., …Prisinzano, L. (2020). The Gaia-ESO Survey: detection and characterisation of single-line spectroscopic binaries. Astronomy & Astrophysics, 635, https://doi.org/10.1051/0004-6361/201935819

Context. Multiple stellar systems play a fundamental role in the formation and evolution of stellar populations in galaxies. Recent and ongoing large ground-based multi-object spectroscopic surveys significantly increase the sample of spectroscopic b... Read More about The Gaia-ESO Survey: detection and characterisation of single-line spectroscopic binaries.

The Gaia-ESO Survey: a new approach to chemically characterising young open clusters - I. Stellar parameters, and iron-peak, nd proton-capture elements (2020)
Journal Article
Jeffries. (2020). The Gaia-ESO Survey: a new approach to chemically characterising young open clusters - I. Stellar parameters, and iron-peak, nd proton-capture elements. Astronomy and Astrophysics, A34 - A34. https://doi.org/10.1051/0004-6361/201937055

Context. Open clusters are recognised as excellent tracers of Galactic thin-disc properties. At variance with intermediate-age and old open clusters, for which a significant number of studies is now available, clusters younger than ?150 Myr have been... Read More about The Gaia-ESO Survey: a new approach to chemically characterising young open clusters - I. Stellar parameters, and iron-peak, nd proton-capture elements.

The Gaia-ESO survey: Calibrating the relationship between Age and the [C/N] abundance ratio with open clusters (2019)
Journal Article
Casali, G., Magrini, L., Tognelli, E., Jackson, R., Jeffries, R., Lagarde, N., …Bayo, A. (2019). The Gaia-ESO survey: Calibrating the relationship between Age and the [C/N] abundance ratio with open clusters. Astronomy & Astrophysics, 629, Article A62. https://doi.org/10.1051/0004-6361/201935282

Context:
In the era of large high-resolution spectroscopic surveys such as Gaia-ESO and APOGEE, high-quality spectra can contribute to our understanding of the Galactic chemical evolution by providing abundances of elements that belong to the diffe... Read More about The Gaia-ESO survey: Calibrating the relationship between Age and the [C/N] abundance ratio with open clusters.

Expanding associations in the Vela-Puppis region - 3D structure and kinematics of the young population (2019)
Journal Article
Cantat-Gaudin, T., Jordi1, C., Wright, N., Armstrong, J., Vallenari, A., Balaguer-Núñez, L., …Jeffries, R. (2019). Expanding associations in the Vela-Puppis region - 3D structure and kinematics of the young population. Astronomy and Astrophysics, A17 - A17. https://doi.org/10.1051/0004-6361/201834957

Context. The Vela-Puppis region is known to host the Vela OB2 association as well as several young clusters featuring OB and pre-main-sequence stars. Several spatial and kinematic subgroups have been identified in recent years. Aims. By grouping star... Read More about Expanding associations in the Vela-Puppis region - 3D structure and kinematics of the young population.

The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530 from GES and Gaia DR2 (2019)
Journal Article
Wright, N. J., Jeffries, R. D., Jackson, R. J., Bayo, A., Bonito, R., Damiani, F., …Zaggia, S. (2019). The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530 from GES and Gaia DR2. Monthly Notices of the Royal Astronomical Society, 486(2), 2477-2493. https://doi.org/10.1093/mnras/stz870

The combination of precise radial velocities from multi-object spectroscopy and highly accurate proper motions from Gaia DR2 opens up the possibility for detailed 3D kinematic studies of young star-forming regions and clusters. Here, we perform such... Read More about The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530 from GES and Gaia DR2.

The Gaia-ESO Survey: Age spread in the star forming region NGC 6530 from the HR diagram and gravity indicators (2019)
Journal Article
Prisinzano, L., Damiani, F., Kalari, V., Jeffries, R., Bonito, R., Micela, G., …Zaggia, S. (2019). The Gaia-ESO Survey: Age spread in the star forming region NGC 6530 from the HR diagram and gravity indicators. Astronomy & Astrophysics, 623, Article A159. https://doi.org/10.1051/0004-6361/201834870

Context. In very young clusters, stellar age distribution is empirical proof of the duration of star cluster formation and thus it gives indications of the physical mechanisms involved in the star formation process. Determining the amount of interste... Read More about The Gaia-ESO Survey: Age spread in the star forming region NGC 6530 from the HR diagram and gravity indicators.

A search for radius inflation among active M-dwarfs in Praesepe (2018)
Journal Article
Jackson, R. J., Jeffries, R. D., Deliyannis, C. P., Sun, Q., & Douglas, S. T. (2019). A search for radius inflation among active M-dwarfs in Praesepe. Monthly Notices of the Royal Astronomical Society, 483(1), 1125-1138. https://doi.org/10.1093/mnras/sty3184

Rotation periods from Kepler K2 are combined with projected rotation velocities from the WIYN 3.5-m telescope, to determine projected radii for fast-rotating, low-mass ($0.15 \leq M/M_{\odot} \leq 0.6$) members of the Praesepe cluster. A maximum like... Read More about A search for radius inflation among active M-dwarfs in Praesepe.

The Gaia-ESO Survey: the origin and evolution of s-process elements (2018)
Journal Article
Jeffries. (2018). The Gaia-ESO Survey: the origin and evolution of s-process elements. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201832841

Context. Several works have found an increase of the abundances of the s-process neutron-capture elements in the youngest Galactic stellar populations. These trends provide important constraints on stellar and Galactic evolution and they need to be c... Read More about The Gaia-ESO Survey: the origin and evolution of s-process elements.

The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure (2018)
Journal Article
Franciosini, E., Sacco, G., Jeffries, R., Damiani, F., Roccatagliata, V., Fedele, D., & Randich, S. (2018). The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure. Astronomy & Astrophysics, 616, L12. https://doi.org/10.1051/0004-6361/201833815

Gaia-ESO Survey observations of the young Gamma Velorum cluster led to the discovery of two kinematically distinct populations, Gamma Vel A and B, respectively, with population B extended over several square degrees in the Vela OB2 association. Using... Read More about The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure.

The low mass population of the Vela OB2 association from Gaia (2018)
Journal Article
Armstrong, J. J., Jeffries, R. D., & Wright, N. J. (2018). The low mass population of the Vela OB2 association from Gaia. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L121–L125. https://doi.org/10.1093/mnrasl/sly137

The first Gaia Data Release presents an opportunity to characterise the low-mass population of OB associations, providing larger statistical samples and better constraints on the formation and evolution of clusters and associations. Using previously... Read More about The low mass population of the Vela OB2 association from Gaia.

The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters (2018)
Journal Article
Jeffries, R., Jackson, R., & Wright, N. (2018). The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201832645

Context
The origin and dynamical evolution of star clusters is an important topic in stellar astrophysics. Several models have been proposed in order to understand the formation of bound and unbound clusters and their evolution, and they can be test... Read More about The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters.

The inflated radii of M-dwarfs in the Pleiades (2018)
Journal Article
Jackson, R. J., Deliyannis, C. P., & Jeffries, R. D. (2018). The inflated radii of M-dwarfs in the Pleiades. Monthly Notices of the Royal Astronomical Society, 476(3), 3245-3262. https://doi.org/10.1093/mnras/sty374

Rotation periods obtained with the Kepler satellite have been combined with precise measurements of projected rotation velocity from the WIYN 3.5-m telescope to determine the distribution of projected radii for several hundred low-mass (0.1 6 M/M? 6... Read More about The inflated radii of M-dwarfs in the Pleiades.

The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration (2018)
Journal Article
Randich, S., Tognelli, E., Jackson, R., Jeffries, R., Degl’Innocenti, S., Pancino, E., …Zaggia, S. (2018). The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration. Astronomy and Astrophysics, 612, Article A99. https://doi.org/10.1051/0004-6361/201731738

Context
Determination and calibration of the ages of stars, which heavily rely on stellar evolutionary models, are very challenging, while representing a crucial aspect in many astrophysical areas.

Aims
We describe the methodologies that, taking... Read More about The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration.

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