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tokens: Acknowledgements We thank Andreas Irrgang and Simon Kreuzer for the development of the SED fitting tool, Monika Schork for measuring the radial velocities of HZ 44 from HIRES spectra, and Markus Schindewolf for providing preliminary atmosphericparameters of HZ 44. M.L. acknowledges funding from the Deutsche Forschungsgemeinschaft (grant DR 281/35-1). Based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive (prop. ID GO5305) at the Space Telescope Science Institute. STScI is operated by the Association of Universities for Research in Astronomy, Inc. under NASA contract NAS 5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. Based on INES data from the IUE satellite. Based on observations made with ESO Telescopes at the La Silla Paranal Observatoryunder programme ID 074.B-0455(A). This research has made use of the Keck Observatory Archive (KOA), which is operated by the W.M. Keck Observatory and the NASA Exoplanet Science Institute (NExScI), under contract with the National Aeronautics and Space Administration. This work has made use of data from the European Space Agency (ESA) mission Gaia ( https://www.cosmos.esa.int/gaia ), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium ). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The TOSS service ( http://dc.g-vo.org/TOSS ) used for this paper was constructed as part of the activities of the German Astrophysical Virtual Observatory. We acknowledge the use of the Atomic Line List ( http://www.pa.uky.edu/~peter/newpage/ ). We also thank the referee, C. Moni Bidin, for his helpful comments.