Browsing by Subject "stars: atmospheres"

Now showing items 1-3 of 3

Four years of starspot evolution on an active F-type ultra-fast rotator KIC 6791060

Karmakar, Subhajeet; Pandey, J. C; Savanov, Igor S; Raj, A; Dmitrienko, E. S; Pakhomov, Yurij; Sahu, D. K (Cambridge University Press, 2018-02)

Using the data obtained from Kepler satellite, we have analyzed an F-type ultra-fast rotator KIC 6791060. We derive a rotational period of 0.34365±0.00004 d. Multiple periodicity with a period separation of ∼0.00016 d was ...
High-resolution spectroscopy of the high-velocity hot post-AGB star IRAS 18379–1707 (LS 5112)

Ikonnikova, N. P; Parthasarathy, M; Dodin, A. V; Hubrig, S; Sarkar, G (Oxford University Press on behalf of the Royal Astronomical Society, 2020-02)

The high-resolution (⁠R∼48000⁠) optical spectrum of the B-type supergiant LS 5112, identified as the optical counterpart of the post-AGB candidate IRAS 18379–1707 is analysed. We report the detailed identifications of the ...
Non-local Thermodynamic Equilibrium Abundance Analyses of the Extreme Helium Stars V652Her and HD144941

Pandey, G; Lambert, D. L (IOP Publishing, 2017-10)

Optical high-resolution spectra of V652 Her and HD 144941, the two extreme helium stars with exceptionally low C / He ratios, have been subjected to a non-LTE abundance analysis using the tools TLUSTY and SYNSPEC. De fi ning ...

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