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Dr Marcus Lohr

Profile summary

  • Visiting Formal Academic
  • Honorary Associate
  • Faculty of Science, Technology, Engineering & Mathematics
  • School of Physical Sciences
  • marcus.lohr

Research interests

During my PhD at the OU I worked with Andrew Norton, using the SuperWASP archive to study variable stars, especially eclipsing binaries and variables exhibiting period changes.  Initially I concentrated on very short-period binaries - usually W UMa-type contact systems - close to the cut-off in the period distribution for main sequence binaries, around 0.20 days.  Many of these binaries have proved to be part of higher-order multiple systems, leading to an ongoing interest in stellar multiplicity more generally; I have also studied post-common-envelope eclipsing binaries to search for orbital period changes potentially linked to planetary companions.  Currently I am working with Simon Clark, looking at high-mass stars in young massive clusters, especially in the Galactic Centre, and identifying binaries and Cepheids.

Publications

The Arches cluster revisited – IV. Observational constraints on the binary properties of very massive stars (2023-05)
Clark, J. S.; Lohr, M. E.; Najarro, F.; Patrick, L. R. and Ritchie, B. W.
Monthly Notices of the Royal Astronomical Society, 521(3) (pp. 4473-4489)

Constraining the population of isolated massive stars within the Central Molecular Zone (2021-05)
Clark, J. S.; Patrick, L. R.; Najarro, F.; Evans, C. J. and Lohr, M.
Astronomy & Astrophysics, 649, Article A43

A VLT/FLAMES survey for massive binaries in Westerlund 1. V. the X-ray selected blue stragglers Wd1-27 and -30a (2019-03)
Clark, J. S.; Najarro, F.; Negueruela, I.; Ritchie, B. W.; Gonzalez Fernandez, C. and Lohr, M. E.
Astronomy & Astrophysics, 623, Article A83

An updated stellar census of the Quintuplet cluster (2018-10)
Clark, J. S.; Lohr, M. E.; Patrick, L. R.; Najarro, F.; Dong, H. and Figer, D. F.
Astronomy & Astrophysics, 618, Article A2

The Arches cluster revisited: II. A massive eclipsing spectroscopic binary in the Arches cluster (2018-09-13)
Lohr, M. E.; Clark, J. S.; Najarro, F.; Patrick, L. R.; Crowther, P. A. and Evans, C. J.
Astronomy & Astrophysics, 617, Article A66

New Cepheid variables in the young open clusters Berkeley 51 and Berkeley 55 (2018-08-21)
Lohr, M. E.; Negueruela, I.; Tabernero, H. M.; Clark, J. S.; Lewis, F. and Roche, P.
Monthly Notices of the Royal Astronomical Society, 478(3) (pp. 3825-3831)

SuperWASP discovery and SALT confirmation of a semi-detached eclipsing binary that contains a delta Scuti star (2016-03)
Norton, A.J.; Lohr, M.E.; Smalley, B.; Wheatley, P.J. and West, R.G.
Astronomy & Astrophysics, 587, Article A54(March 2016)

A long-period Cepheid variable in the starburst cluster VdBH222 (2015-12-07)
Clark, J. S.; Negueruela, I.; Lohr, M. E.; Dorda, R.; González-Fernández, C.; Lewis, F. and Roche, P.
Astronomy & Astrophysics, 584, Article L12

Starspot distributions on fully convective M dwarfs: implications for radial velocity planet searches (2015-10-07)
Barnes, J. R.; Jeffers, S. V.; Jones, H. R. A.; Pavlenko, Ya. V.; Jenkins, J. S.; Haswell, C. A. and Lohr, M. E.
The Astrophysical Journal, 812(1) (p 42)

Orbital period changes and the higher-order multiplicity fraction amongst SuperWASP eclipsing binaries (2015-06-17)
Lohr, M. E.; Norton, A. J.; Payne, S. G.; West, R. G. and Wheatley, P. J.
Astronomy & Astrophysics, 578, Article A136

The doubly eclipsing quintuple low-mass star system 1SWASP J093010.78+533859.5 (2015-06-12)
Lohr, M. E.; Norton, A. J.; Gillen, E.; Busuttil, R.; Kolb, U. C.; Aigrain, S.; McQuillan, A.; Hodgkin, S. T. and González, E.
Astronomy & Astrophysics, 578, Article A103

An Astrophysical Laboratory: Understanding and Exploiting the Young Massive Cluster Westerlund 1 (2015-03)
Clark, Simon; Negueruela, Ignacio; Ritchie, Ben; Najarro, Paco; Langer, Norbert; Crowther, Paul; Bartlett, Liz; Fenech, Danielle; González-Fernández, Carlos; Goodwin, Simon; Lohr, Marcus and Prinja, Raman
The Messenger, 159 (pp. 30-35)

Period and amplitude variations in post-common-envelope eclipsing binaries observed with SuperWASP (2014-06)
Lohr, M. E,; Norton, A. J.; Anderson, D. R.; Collier Cameron, A.; Faedi, F.; Haswell, C. A.; Hellier, C.; Hodgkin, S. T.; Horne, K.; Kolb, U. C.; Maxted, P. F. L.; Pollacco, D.; Skillen, I.; Smalley, B.; West, R. G. and Wheatley, P. J.
Astronomy & Astrophysics, 566, Article A128

Parameters of two low-mass contact eclipsing binaries near the short-period limit (2014-02)
Lohr, M. E.; Hodgkin, S. T.; Norton, A. J. and Kolb, U. C.
Astronomy & Astrophysics, 563, Article A34

One, two, or three stars? An investigation of an unusual eclipsing binary candidate undergoing dramatic period changes (2013-10)
Lohr, M. E.; Norton, A. J.; Kolb, U. C. and Boyd, D. R. S.
Astronomy & Astrophysics, 558

Period and period change measurements for 143 SuperWASP eclipsing binary candidates near the short-period limit and discovery of a doubly eclipsing quadruple system (2013-01)
Lohr, M. E.; Norton, A. J.; Kolb, U. C.; Maxted, P. F. L.; Todd, I. and West, R. G.
Astronomy & Astrophysics, 549, Article A86

Period decrease in three SuperWASP eclipsing binary candidates near the short-period limit (2012-06)
Lohr, M. E.; Norton, A. J.; Kolb, U. C.; Anderson, D. R.; Faedi, F. and West, R. G.
Astronomy & Astrophysics, 542, Article A124

Photospheric acne at the bottom of the main-sequence: Doppler images of M4.5 - M9V stars (2016)
Barnes, John; Haswell, Carole; Jeffers, Sandra; Jones, Hugh; Pavlenko, Yakiv; Lohr, Marcus and Jenkins, James
In : The 19th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (Jun 2016, Uppsala, Sweden)

Exploring eclipsing binaries, triples and higher-order multiple star systems with the SuperWASP archive (2015-08-03)
Lohr, Marcus
In : Living Together: Planets, Host Stars and Binaries (8-12 Sep 2014, Litomyšl, Czech Republic) (pp. 71-75)

Eclipsing Binaries and Period Changes in the SuperWASP Archive (2015-01-13)
Lohr, Marcus
PhD thesis The Open University