Mission
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!
- 2020
TESS observations of the interesting pulsating subdwarf B star CD-28° 1974
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° 1974’s structure is somewhat different from typical sdBV stars.
- 2024
The double low-mass white dwarf eclipsing binary system J2102-4145 and its possible evolution
Approximately 150 low-mass white dwarfs, with masses below 0.4 Msun, have been discovered. The majority of these low-mass WDs are observed in binary systems as they cannot be formed through single-star evolution within the Hubble time. Our new study presents a comprehensive analysis of the double low-mass WD eclipsing binary system J2102-4145.
- 2021
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 subsolar metallicity in the G1V companion. With high-quality observations and Gaia astrometric data, we aim at measuring the ...
- 2024
A seven-Earth-radius helium-burning star inside a 20.5-min detached binary
Binary evolution theory predicts that the second common envelope (CE) ejection can produce low-mass (0.32 - 0.36 solar mass) subdwarf B (sdB) stars inside ultrashort-orbital-period binary systems. Their helium cores are ignited under nondegenerate conditions. With the orbital decay driven by gravitational-wave (GW) radiation, the minimum orbital periods of detached sdB binaries could be as short as 20 minutes. However, only four sdB binaries with orbital periods ...
