Stellar Population team at Lund Observatory
My research team consists of close collaborators at Lund Observatory as well
as collegues in Europe, the US and Australia. The core of the stellar
population team in Lund consists of Thomas Bensby (expert in high-resolution
spectroscopy and PI for one of the 4MOST surveys), Ross Church (expert in
stellar evolution), Gregor Traven (postdoc, expert on studies of the
binary populations in the Milky Way, he also work on infrastructure tasks
in 4MOST), Christian Sahlholdt (PhD student, working on age
determinations of stars and stellar population studies), Fan Liu (postdoc, expert on high precision abundance
of solar type stars, he is also involved in PLATO),
Dominic Ford (postdoc and programmer, working on 4MOST abundance pipeline for
In Lund we work closely with Lennart Lindegren (expert in astrometry and
proposer of Gaia), Paul McMillan (expert in dynamical modelling of the Milky
Way), and Nils Ryde (expert in high-resolution spectroscopic studies making
use of near-infrared wavelength regime).
Nationally we collaborate with in Uppsala: Paul Barklem, Bengt Edvardsson,
Bengt Gustafsson, Andreas Korn, Ulrike Heiter, and Nik Piskunov. And in
Stockholm: Arjan Bik, Alexis Brandeker, and Göran Östlin.
Internationally we are members of several large collaborations include 4MOST,
WEAVE, PLATO, and the Gaia-ESO survey. More information about these projects
available unde Research.
Former team members
Louise Howes, postdoc (2015 - 2018)
Louise holds a PhD from the Australian National University. Her PhD focused on
finding the first stars in the Galactic Bulge using SkyMapper data and
follow-up studies with high-resolution spectroscopy. Whilst in Lund Louise
worked on stellar population studies as well as on methods of determining
ages from photometry combined with Gaia parallaxes. She was also heavily
involved in development work for the Galactic surveys with 4MOST as well as
other infrastructure work for the survey (especially the helpdesk definition
Pieter Gruyters, postdoc (2015 - 2017)
Pieter holds a PhD from Uppsala University. Whilst in Lund he worked in the
SAGA project with myself and Luca Casagrande, who is the PI of SAGA.
Ingemar Lundström, lecturer, was for many years a
close collaborator. His deep
expertise in Strömgren photometry was essential to the revival of this
photometric system that started with our work on several dwarf spheroidal
galaxies and have now resulted in the SAGA project, led by Luca Casagrande.
postdoc (2014 - 2016)
Edita holds a PhD from University
of Vilnius. In her thesis she determined
the elemental abundance profile of several moving groups. Such data is
useful in order to understand how likely it is that a group is the result of
dissolved cluster or the result of dynamical processes in the Milky Way
disk. Whilst in Lund Edita became heavily involved in determineing the
selection function for the Gaia-ESO Survey and together with Ross
Church we began a project on modelling the binary stellar populations in the
Milky Way, with a first application to data from the APOGEE survey which has
excellent temporal coverage. Our collaboration continues.
Gregory Ruchti, postdoc (2012 - 2016)
Greg holds a PhD from Johns Hopkins University, US,
where he was supervised by Rosie Wyse. His PhD dealt with studies of the thick
disk based. He came to Lund from MPA in Garching where he worked in
Martin Asplund’s group. During his years at MPA he work closely with Maria
Bergemann and Karin Lind on projects related to NLTE analysis of stellar
spectra. These collabortions continued whilst in Lund, not the least inside
the Gaia-ESO Survey where Greg, Maria and Karin lead much of the Lumba effort
of the spectral analsysis. In a work led by Greg we developed the SWOC tool to
better understand the impact of choices to made on wavelength ranges for stellar
spectrographs. This tool was employed in the optimization of the 4MOST
Greg now works at Veracity. Here is
link to an article by Greg about leaving
the ivory tower.
PhD student (2012 - 2016) Thesis: The nature of stars with
a common origin: clues from metallicity, elemental abundances, and kinematics.
After his PhD Cheng has moved to a fellowship at LAMOST.
Daniel Adén, PhD
student (2007 - 2011),
postdoc (2011 - 2012)
Thesis: A study of the Hercules dwarf
. After a year as a postdoc with us working on tests
for the Gaia-ESO Survey Daniel decided to look for a job in industry,
where he has a prosperous career.
PhD student (2010 - 2015)
Thesis: The origin and chemical evolution of
iron-peak and neutron-capture elements in the Milky Way
. Chiara was jointly supervised by Thomas
Bensby and myself. She is now a postdoc in Norbert Christlieb's group at
Universität Heidelberg where she also participates in the work for 4MOST.
Anna Arnadottir, PhD
student (2004 - 2009)
Thesis: A photometric study of the Galactic disks based on Strömgren
. Today Anna heads the Lund Observatory
Planetarium at the Vattenhallen Science Centre. You find her
PhD student (2001 - 2006)
Thesis: Photometry of resolved
stellar populations in local group galaxies
. Today Daniel works for
the Swedish Defence research (FOI).
Postdoc (2007 - 2009)
Jennifer was an Incoming International
Marie Curie Fellow. Together we worked on studies of the mildly metal-rich
globular cluster NGC 5927. After her time in Lund she worked as a postdoc
in Utah and later in scientific publishing in New York.
PhD student (2000 - 2004)
Thesis: Observational studies of
the chemical evolution in the Galactic
thin and thick disks
. Thomas was first a postdoc with Sally Oey at
Unievrsity of Michigan, Ann Arbor, and then an ESO fellow in Chile. After
that he rejoined Lund Observatory as "forskarassistent" with funding from the
Swedish Research council. Thomas is now a lecturer at Lund Observatory. We enjoy a
longstanding and fruitful collaboration.