LAUNCHED XTgrid Sandbox: Online spectral analyses with Tlusty models!

Recent Projects

  • October 23, 2017 1/5

    The Long-period sdB Binary PG 1018–047

    MNRAS, 2018, 474, 433L0BDZP

    We have revisited the sdB+K-star long-period binary PG 1018–047 based on 20 new high-resolution VLT/UVES spectra that provided regular coverage over a period of more than 26 ...

  • October 24, 2017 2/5

    Composite hot subdwarf binaries from UVES

    MNRAS, 2018, 473, 693KW32YZ

    Hot subdwarf-B (sdB) stars in long-period binaries are found to be on eccentric orbits, even though current binary-evolution theory predicts these objects to be circularised ...

  • November 09, 2017 3/5

    A FEROS survey of hot subdwarf stars

    Open Astronomy - 2017VPD0AJ

    We have initiated a small survey of twenty hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes ...

  • December 12, 2017 4/5

    Atomic diffusion in the atmosphere of Feige 86

    Open Astronomy - 2017ASYYL4

    A re-analysis of the ultraviolet and optical spectra of Feige 86 found large abundances of xenon in its atmosphere. The star shows a rich, sharp-lined peculiar spectrum both in ...

  • February 28, 2020 5/5

    TESS observations of the interesting pulsating subdwarf B star CD-281974


    From TESS observations we have discovered CD-281974 to be a pulsating subdwarf B star which has an unusual gravity(g)-mode asymptotic sequence indicating that CD-28 1974’s ...


Astroserver is a private, community supported non-profit organization with affordable solutions in research astronomy. The team offers expertise mainly in stellar astrophysics, spectroscopy, non-LTE model atmosphere calculations, assistance with publications and media content production, and help with service observations. These services are similar to the tasks of post-doctoral and graduate researchers. Therefore, our activity can be integrated into the programme of graduate schools and research institutes. To wrap-up: Astroserver is your "occasional post-doc".

The main goal of the Astroserver Team is to provide precise and reliable measurements of stellar atmospheric parameters in a consistent way across the Hertzsprung-Russell Diagram and make it accessible to everyone. The accuracy of these solutions depends on the choice of the model, the quality of input atomic data and observations. Therefore, our Team continuously improves the models and revise the atomic data input by analyzing high quality observations of standard objects. Beyond the main mission the Team is also keen on finding solutions to challenging problems on the frontiers of applied stellar spectroscopy.

Interested researchers: Please consider our services in the budget plan of your grant applications! Upon request we contribute to such proposals free of charge.

Feel free to contact us for more information!


We are currently looking at ways how to generalize and make accessible a self-service tool for the spectroscopic analysis of composite spectra. The reasons to make efforts in this direction are that many stars are in binaries and binaries provide not only more, but, in some cases, key information to astronomers. This information, however, come at a price. While the analyses of single stars are challenging, binaries and multiple objects prove even more than twice as difficult and tedious.

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