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Mid Infrared Spectro-Photometric Monitoring of V4334 Sagittarii (aka Sakurai’s Object)
V4334 Sgr is a star which underwent a very late Helium shell flash in 1995 [1,2]. The last known similar event was V605Aql in 1919. V4334 Sgr has...
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The High-Resolution Frontier in Infrared Spectroscopy
High-resolution astronomical spectroscopy in the infrared from large groundbased telescopes will lead to outstanding developments in many areas of...
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Radial Pulsations of Stars at the Stage of the Final Helium Flash
Stellar evolution calculations were performed for population I stars with masses on the main sequence 1 M ⊙ ≤ M 0 ≤ 1.5 M ⊙ up to the stage of a cooling...
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Nuclear properties for nuclear astrophysics studies
The need for nuclear data for astrophysics applications challenges experimental techniques as well as the robustness and predictive power of present...
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Nuclear Data and Experiments for Astrophysics
Nuclear astrophysics aims to understand the origin of elements and the role of nuclear processes in astrophysical events. Nuclear reactions and...
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Spectroscopy of Supergiants with Infrared Excess: Results of 1998–2018
We shortly summarize here the results of the second stage (1998–2018) of the detailed spectroscopy program of peculiar supergiants identified with...
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The inside-out planetary nebula around a born-again star
Planetary nebulae are ionized clouds of gas formed by the hydrogen-rich envelopes of low- and intermediate-mass stars ejected at late evolutionary...
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Binary Systems and Their Nuclear Explosions
The nuclear energy supply of a typical star like the Sun would be ∼1052 erg if all the hydrogen could be incinerated into iron peak elements. Since...
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Circumstellar envelope manifestations in the optical spectra of evolved stars
We analyze the peculiarities of the optical spectra of luminous stars with circumstellar gas and dust envelopes: the time variability of the...
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Evolution of red Nova V4332 Sagittarii remnant
We present the multicolor BV RI photometry and BTA/SCORPIO spectroscopy for the red nova V4332 Sgr, performed in 2005–2012. We have analyzed the...
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Study of the physics and evolution of stars at the 6-m BTA telescope
Since 1978, extensive observations of stars have been performed at the 6-m BTA telescope using both standard and newly developed instruments. We give...
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Evolution on the Asymptotic Giant Branch
Stars of low and intermediate mass experience recurrent thermal instabilities during the phase of double (hydrogen and helium) shell burning. During...
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Search for and study of hot circumstellar dust envelopes
Long-term (1984–2008) JHKLM photometry for 254 objects is presented. The observations were carried out in the standard JHKLM photometric system using...
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Binary Systems and Their Nuclear Explosions
The nuclear energy supply of a typical star like the Sun would be ~ 1052 erg if all the hydrogen could be incinerated into iron peak elements. Since...
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Pulsations and long-term photometric variability of three candidates for protoplanetary nebulae
We present new photometric data and analyze long-term UBV observations of three candidates for protoplanetary nebulae—F supergiants with infrared...
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High-resolution spectroscopy of the R Coronae Borealis and Other Hydrogen Deficient Stars
High-resolution spectroscopy is a very important tool for studying stellar physics, perhaps, particularly so for such enigmatic objects like the R...
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Element Abundance Determination in Hot Evolved Stars
The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused by a (very) late helium-shell flash or a AGB...
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Stellar Structure and Evolution: An Introduction
The synthesis of new elements takes place inside stars. How do stars evolve and distribute this creation to the universe at large? This article...
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AGB star intershell abundances inferred from UV spectra of extremely hot post-AGB stars
The hydrogen-deficiency in extremely hot post-AGB stars of spectral class PG1159 is probably caused by a (very) late helium-shell flash or a AGB...