LAUNCHED XTgrid Sandbox: Online spectral analyses with Tlusty or CMFGEN models!

Recent Projects

  • February 28, 2020 1/5

    TESS observations of the interesting pulsating subdwarf B star CD-28° 1974

    MNRAS, 2020, 493, 5162FC6QRB

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

  • June 05, 2021 2/5

    Orbital and atmospheric parameters of two O-type subdwarf binaries: BD-11° 162 and Feige 80

    A&A, AcceptedEZZ74T

    Using high-resolution spectra the orbital and atmospheric parameters of BD-11° 162 and Feige 80 have been solved. Masses of the companions and the sdOs were obtained, and the ...

  • July 07, 2021 3/5

    The first heavy-metal hot subdwarf composite binary SB 744


    A radial velocity follow-up of the long-period sdOB+G1V type spectroscopic binary SB 744 revealed strong lines of fluorine and lead in the optical spectrum of the sdOB star and ...

  • January 19, 2022 4/5

    Filling the gap between synchronized and non-synchronized sdBs: TIC 137608661

    MNRAS, AcceptedUX87S2

    TIC 137608661 is a new sdBV+dM reflection-effect binary discovered by the TESS space mission with an orbital period of 7.21 hours. In addition to the orbital frequency and its ...

  • May 30, 2022 5/5

    An 18.9-minute Blue Large-Amplitude Pulsator Crossing the "Hertzsprung Gap" of Hot Subdwarfs


    Blue large-amplitude pulsators (BLAPs) represent a new and rare class of hot pulsating stars with unusually large amplitudes and short periods. Up to now, only 24 confirmed BLAPs ...


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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