Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815

Friel, E. D.; Donati, P.; Bragaglia, A.; Jacobson, H. R.; Magrini, L.; Prisinzano, L.; Randich, S.; Tosi, M.; Cantat-Gaudin, T.; Vallenari, A.; Smiljanic, R.; Carraro, G.; Sordo, R.; Maiorca, E.; Tautvaišien*error*ė, G.; Sestito, P.; Zaggia, S.; Jiménez-Esteban, F. M.; Gilmore, G.; Jeffries, R. D.; Alfaro, E.; Bensby, T.; Koposov, S. E.; Korn, A. J.; Pancino, E.; Recio-Blanco, A.; Franciosini, E.; Hill, V.; Jackson, R. J.; de Laverny, P.; Morbidelli, L.; Sacco, G. G.; Worley, C. C.; Hourihane, A.; Costado, M. T.; Jofré, P.; Lind, K.

doi:10.1051/0004-6361/201323215

The Gaia-ESO Survey: dynamical models of flattened, rotating globular clusters (2017)
Journal Article
Jeffreson, S., Sanders, J., Evans, N., Williams, A., Gilmore, G., Bayo, A., …Zaggia, S. (2017). The Gaia-ESO Survey: dynamical models of flattened, rotating globular clusters. Monthly Notices of the Royal Astronomical Society, 469(4), 4740 -4762. https://doi.org/10.1093/mnras/stx1152

We present a family of self-consistent axisymmetric rotating globular cluster models which are fitted to spectroscopic data for NGC 362, NGC 1851, NGC 2808, NGC 4372, NGC 5927 and NGC 6752 to provide constraints on their physical and kinematic proper... Read More about The Gaia-ESO Survey: dynamical models of flattened, rotating globular clusters.

The Gaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I (2017)
Journal Article
Sacco, G., Spina, L., Randich, S., Palla, F., Parker, R., Jeffries, R., …Zaggia, S. (2017). The Gaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I. Astronomy and Astrophysics, 601, https://doi.org/10.1051/0004-6361/201629698

Investigating the physical mechanisms driving the dynamical evolution of young star clusters is fundamental to our understanding of the star formation process and the properties of the Galactic field stars. The young (~2 Myr) and partially embedded c... Read More about The Gaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I.

The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters ??? (2017)
Journal Article
Jeffries. (2017). The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters ???. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201630078

Context. The radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling disc formation and evolution. Open star clusters allow us to derive both the radial metallicity distribution and its evolution over t... Read More about The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters ???.

The Gaia-ESO Survey: Calibration strategy (2017)
Journal Article
Pancino, E., Lardo, C., Altavilla, G., Marinoni, S., Ragaini, S., Cocozza, G., …Koch, A. (2017). The Gaia-ESO Survey: Calibration strategy. Astronomy and Astrophysics, 598, A5. https://doi.org/10.1051/0004-6361/201629450

The Gaia-ESO survey (GES) is now in its fifth and last year of observations and has produced tens of thousands of high-quality spectra of stars in all Milky Way components. This paper presents the strategy behind the selection of astrophysical calibr... Read More about The Gaia-ESO Survey: Calibration strategy.

The Age of Taurus: Environmental Effects on Disc Lifetimes (2015)
Journal Article
Rees, J. M., Wilson, T., Bell, C. P. M., Jeffries, R. D., & Naylor, T. (2015). The Age of Taurus: Environmental Effects on Disc Lifetimes. Proceedings of the International Astronomical Union, 10(S314), 205-206. https://doi.org/10.1017/s1743921315006286

Using semi-empirical isochrones, we find the age of the Taurus star-forming region to be 3-4 Myr. Comparing the disc fraction in Taurus to young massive clusters suggests discs survive longer in this low density environment. We also present a method... Read More about The Age of Taurus: Environmental Effects on Disc Lifetimes.

The Gaia-ESO Survey: N-body modelling of the Gamma Velorum cluster (2015)
Journal Article
Mapelli, M., Vallenari, A., Jeffries, R. D., Gavagnin, E., Cantat-Gaudin, T., Sacco, G. G., …Worley, C. C. (2015). The Gaia-ESO Survey: N-body modelling of the Gamma Velorum cluster. Astronomy & Astrophysics, 578, A35. https://doi.org/10.1051/0004-6361/201425514

The Gaia-ESO Survey has recently unveiled the complex kinematic signature of the Gamma Velorum cluster: this cluster is composed of two kinematically distinct populations (hereafter, population A and B), showing two different velocity dispersions and... Read More about The Gaia-ESO Survey: N-body modelling of the Gamma Velorum cluster.

Gaia-ESO Survey: Analysis of pre-main sequence stellar spectra (2015)
Journal Article
Lanzafame, A. C., Frasca, A., Damiani, F., Franciosini, E., Cottaar, M., Sousa, S. G., …Zaggia, S. (2015). Gaia-ESO Survey: Analysis of pre-main sequence stellar spectra. Astronomy & Astrophysics, 576, Article A80. https://doi.org/10.1051/0004-6361/201424759

Context. The Gaia-ESO Public Spectroscopic Survey is obtaining high-quality spectroscopy of some 100 000 Milky Way stars using the FLAMES spectrograph at the VLT, down to V = 19 mag, systematically covering all the main components of the Milky Way an... Read More about Gaia-ESO Survey: Analysis of pre-main sequence stellar spectra.

TheGaia-ESO Survey: Chromospheric emission, accretion properties, and rotation inγVelorum and Chamaeleon I (2015)
Journal Article
Frasca, A., Biazzo, K., Lanzafame, A. C., Alcalá, J. M., Brugaletta, E., Klutsch, A., …Worley, C. C. (2015). TheGaia-ESO Survey: Chromospheric emission, accretion properties, and rotation inγVelorum and Chamaeleon I. Astronomy & Astrophysics, 575, A4. https://doi.org/10.1051/0004-6361/201424409

Aims. One of the goals of the Gaia-ESO Survey (GES), which is conducted with FLAMES at the VLT, is the census and the characterization of the low-mass members of very young clusters and associations. We conduct a comparative study of the main propert... Read More about TheGaia-ESO Survey: Chromospheric emission, accretion properties, and rotation inγVelorum and Chamaeleon I.

The Gaia-ESO Survey: Kinematics of seven Galactic globular clusters (2015)
Journal Article
Lardo, C., Pancino, E., Bellazzini, M., Bragaglia, A., Donati, P., Gilmore, G., …Worley, C. C. (2015). The Gaia-ESO Survey: Kinematics of seven Galactic globular clusters. Astronomy & Astrophysics, 573, Article A115. https://doi.org/10.1051/0004-6361/201425036

The Gaia-ESO survey is a large public spectroscopic survey aimed at investigating the origin and formation history of our Galaxy by collecting spectroscopy of representative samples (about 105 Milky Way stars) of all Galactic stellar populations, in... Read More about The Gaia-ESO Survey: Kinematics of seven Galactic globular clusters.

Pre-main-sequence isochrones - III: The Cluster Collaboration isochrone server (2014)
Journal Article
Jeffries. (2014). Pre-main-sequence isochrones - III: The Cluster Collaboration isochrone server. Monthly Notices of the Royal Astronomical Society, 3496 - 3511. https://doi.org/10.1093/mnras/stu1944

We present an isochrone server for semi-empirical pre-main-sequence model isochrones in the following systems: Johnson–Cousins, Sloan Digital Sky Survey, Two-Micron All-Sky Survey, Isaac Newton Telescope (INT) Wide-Field Camera and INT Photometric Ha... Read More about Pre-main-sequence isochrones - III: The Cluster Collaboration isochrone server.

Using rotation, magnetic activity and lithium to estimate the ages of low mass stars (2014)
Journal Article
Jeffries, R. (2014). Using rotation, magnetic activity and lithium to estimate the ages of low mass stars. EAS Publications Series, 65, 289-325. https://doi.org/10.1051/eas/1465008

The rotation rate, level of magnetic activity and surface lithium abundance are age-dependent quantities in stars of about a solar mass and below. The physical reasons for the evolution of these phenomena are qualitatively understood, but accurate qu... Read More about Using rotation, magnetic activity and lithium to estimate the ages of low mass stars.

The Gaia-ESO Survey: Metallicity of the Chamaeleon I star-forming region (2014)
Journal Article
Spina, L., Randich, S., Palla, F., Biazzo, K., Sacco, G. G., Alfaro, E. J., …Worley, C. C. (2014). The Gaia-ESO Survey: Metallicity of the Chamaeleon I star-forming region. Astronomy & Astrophysics, 568, A2. https://doi.org/10.1051/0004-6361/201424135

Context. Recent metallicity determinations in young open clusters and star-forming regions suggest that the latter may be characterized by a slightly lower metallicity than the Sun and older clusters in the solar vicinity. However, these results are... Read More about The Gaia-ESO Survey: Metallicity of the Chamaeleon I star-forming region.

The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster gamma Velorum (2014)
Journal Article
Spina, L., Randich, S., Palla, F., Sacco, G. G., Magrini, L., Franciosini, E., …Worley, C. (2014). The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster gamma Velorum. Astronomy & Astrophysics, 567, Article A55. https://doi.org/10.1051/0004-6361/201423527

Context. Knowledge of the abundance distribution of star forming regions and young clusters is critical to investigate a variety of issues, from triggered star formation and chemical enrichment by nearby supernova explosions to the ability to form pl... Read More about The Gaia-ESO Survey: the first abundance determination of the pre-main-sequence cluster gamma Velorum.

The Gaia-ESO Survey: the Galactic thick to thin disc transition (2014)
Journal Article
Recio-Blanco, A., de Laverny, P., Kordopatis, G., Helmi, A., Hill, V., Gilmore, G., …Maiorca, E. (2014). The Gaia-ESO Survey: the Galactic thick to thin disc transition. Astronomy & Astrophysics, 567, Article A5. https://doi.org/10.1051/0004-6361/201322944

Aims. The nature of the thick disc and its relation to the thin disc is presently an important subject of debate. In fact, the structural and chemo-dynamical transition between disc populations can be used as a test of the proposed models of Galactic... Read More about The Gaia-ESO Survey: the Galactic thick to thin disc transition.

Gaia-ESO Survey: Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440–6810 Å in theγVelorum cluster, and calibration of spectral indices (2014)
Journal Article
Damiani, F., Prisinzano, L., Micela, G., Randich, S., Gilmore, G., Drew, J. E., …Maiorca, E. (2014). Gaia-ESO Survey: Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440–6810 Å in theγVelorum cluster, and calibration of spectral indices. Astronomy and Astrophysics, 566, A50. https://doi.org/10.1051/0004-6361/201323306

We present a study of spectral diagnostics available from optical spectra with R = 17 000 obtained with the VLT/Giraffe HR15n setup, using observations from the Gaia-ESO Survey, on the γ Vel young cluster, with the purpose of classifying these stars... Read More about Gaia-ESO Survey: Empirical classification of VLT/Giraffe stellar spectra in the wavelength range 6440–6810 Å in theγVelorum cluster, and calibration of spectral indices.

The Gaia-ESO Survey: processing FLAMES-UVES spectra (2014)
Journal Article
Sacco, G. G., Morbidelli, L., Franciosini, E., Maiorca, E., Randich, S., Modigliani, A., …Worley, C. (2014). The Gaia-ESO Survey: processing FLAMES-UVES spectra. Astronomy & Astrophysics, 565, A113. https://doi.org/10.1051/0004-6361/201423619

The Gaia-ESO Survey is a large public spectroscopic survey that aims to derive radial velocities and fundamental parameters of about 105 Milky Way stars in the field and in clusters. Observations are carried out with the multi-object optical spectrog... Read More about The Gaia-ESO Survey: processing FLAMES-UVES spectra.

The effect of starspots on the radii of low-mass pre-main-sequence stars (2014)
Journal Article
Jackson, R. J., & Jeffries, R. D. (2014). The effect of starspots on the radii of low-mass pre-main-sequence stars. Monthly Notices of the Royal Astronomical Society, 441(3), 2111-2123. https://doi.org/10.1093/mnras/stu651

A polytropic model is used to investigate the effects of dark photospheric spots on the evolution and radii of magnetically active, low-mass (M < 0.5 M⊙), pre-main-sequence (PMS) stars. Spots slow the contraction along Hayashi tracks and inflate the... Read More about The effect of starspots on the radii of low-mass pre-main-sequence stars.

The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk (2014)
Journal Article
Bergemann, M., Ruchti, G. R., Serenelli, A., Feltzing, S., Alves-Brito, A., Asplund, M., …Tautvaišienė, G. (2014). The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk. Astronomy & Astrophysics, 565, Article A89. https://doi.org/10.1051/0004-6361/201423456

We study the relationship between age, metallicity, and α-enhancement of FGK stars in the Galactic disk. The results are based upon the analysis of high-resolution UVES spectra from the Gaia-ESO large stellar survey. We explore the limitations of the... Read More about The Gaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk.

AN ANOMALOUS EXTINCTION LAW IN THE Cep OB3b YOUNG CLUSTER: EVIDENCE FOR DUST PROCESSING DURING GAS DISPERSAL (2014)
Journal Article
Allen, T. S., Prchlik, J. J., Megeath, S. T., Gutermuth, R. A., Pipher, J. L., Naylor, T., & Jeffries, R. D. (2014). AN ANOMALOUS EXTINCTION LAW IN THE Cep OB3b YOUNG CLUSTER: EVIDENCE FOR DUST PROCESSING DURING GAS DISPERSAL. Astrophysical Journal, 786(2), 113. https://doi.org/10.1088/0004-637x/786/2/113

We determine the extinction law through Cep OB3b, a young cluster of 3000 stars undergoing gas dispersal. The extinction is measured toward 76 background K giants identified with MMT/Hectospec spectra. Color excess ratios were determined toward each... Read More about AN ANOMALOUS EXTINCTION LAW IN THE Cep OB3b YOUNG CLUSTER: EVIDENCE FOR DUST PROCESSING DURING GAS DISPERSAL.

Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815 (2014)
Journal Article
Friel, E. D., Donati, P., Bragaglia, A., Jacobson, H. R., Magrini, L., Prisinzano, L., …Lind, K. (2014). Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815. Astronomy & Astrophysics, 563, 1-10. https://doi.org/10.1051/0004-6361/201323215

Context. NGC 4815 is a populous ~500 Myr open cluster at Rgc ~ 7 kpc observed in the first six months of the Gaia-ESO Survey. Located in the inner Galactic disk, NGC 4815 is an important potential tracer of the abundance gradient, where relatively fe... Read More about Gaia-ESO Survey: Properties of the intermediate age open cluster NGC 4815.

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