Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Karinkuzhi, D"'
Autor:
Karinkuzhi, D., Van Eck, S., Goriely, S., Siess, L., Jorissen, A., Choplin, A., Escorza, A., Shetye, S., Van Winckel, H.
Publikováno v:
A&A 677, A47 (2023)
A sample of 895 s-process-rich candidates has been found among the 454180 giant stars surveyed by LAMOST at low spectral resolution (R~1800). In a previous study, taking advantage of the higher resolution (R~86 000) offered by the the HERMES-Mercator
Externí odkaz:
http://arxiv.org/abs/2305.04189
Autor:
Escorza, A., Karinkuzhi, D., Jorissen, A., Van Eck, S., Schmelz, J. T., Verschuur, G. L., Boffin, H. M. J., De Rosa, R. J., Van Winckel, H.
Publikováno v:
A&A 670, L14 (2023)
56 UMa is a wide binary system that contains a chemically peculiar red giant and a faint companion. Due to its surface chemical abundances, the red giant was classified as a barium (Ba) star. This implies that the companion has to be a white dwarf, s
Externí odkaz:
http://arxiv.org/abs/2301.06531
Over the last decade or so, we have been developing the possible existence of highly magnetized white dwarfs with analytical stellar structure models. While the primary aim was to explain the nature of the peculiar overluminous type Ia supernovae, la
Externí odkaz:
http://arxiv.org/abs/2110.15374
Autor:
Joshi, Santosh, Trust, Otto, Semenko, E., Williams, P. E., Lampens, P., De Cat, P., Vermeylen, L., Holdsworth, D. L., García, R. A., Mathur, S., Santos, A. R. G., Mkrtichian, D., Goswami, A., Cuntz, M., Yadav, A. P., Sarkar, M., Bhatt, B. C., Aliçavuş, F. Kahraman, Nhlapo, M. D., Lund, M. N., Goswami, P. P., Savanov, I., Jorissen, A., Jurua, E., Avvakumova, E., Dmitrienko, E. S., Chakradhari, N. K., Das, M. K., Chowdhury, S., Abedigamba, O. P., Yakunin, I., Letarte, B., Karinkuzhi, D.
We present a study based on the high-resolution spectroscopy and K2 space photometry of five chemically peculiar stars in the region of the open cluster M44. The analysis of the high-precision photometric K2 data reveals that the light variations in
Externí odkaz:
http://arxiv.org/abs/2110.14275
Autor:
Karinkuzhi, D., Van Eck, S., Jorissen, A., Escorza, A., Shetye, S., Merle, T., Siess, L., Goriely, S., Van Winckel, H.
Publikováno v:
A&A 654, A140 (2021)
A new large sample of 895 s-process-rich candidates out of 454180 giant stars surveyed by LAMOST at low spectral resolution (R ~ 1800) has been reported by Norfolk et al. (2019; hereafter N19). We aim at confirming the s-process enrichment at the hig
Externí odkaz:
http://arxiv.org/abs/2107.08401
Autor:
Karinkuzhi, D., Van Eck, S., Goriely, S., Siess, L., Jorissen, A., Merle, T., Escorza, A., Masseron, T.
Publikováno v:
A&A 645, A61 (2021)
Among Carbon-Enhanced Metal-Poor (CEMP) stars, some are found to be enriched in s-process elements (CEMP-s), in r-process elements (CEMP-r) or in both s- and r-process elements (CEMP-rs). The origin of the abundance differences between CEMP-s and CEM
Externí odkaz:
http://arxiv.org/abs/2010.13620
Autor:
Escorza, A., Karinkuzhi, D., Jorissen, A., Siess, L., Van Winckel, H., Pourbaix, D., Johnston, C., Miszalski, B., Oomen, G-M., Abdul-Masih, M., Boffin, H. M. J., North, P., Manick, R., Shetye, S., Mikołajewska, J.
Publikováno v:
A&A 626, A128 (2019)
Barium (Ba) dwarfs and CH subgiants are the less-evolved analogues of Ba and CH giants. They are F- to G-type main-sequence stars polluted with heavy elements by a binary companion when the latter was on the Asymptotic Giant Branch (AGB). This compan
Externí odkaz:
http://arxiv.org/abs/1904.04095
Autor:
Jorissen, A., Boffin, H. M. J., Karinkuzhi, D., Van Eck, S., Escorza, A., Shetye, S., Van Winckel, H.
Publikováno v:
A&A 626, A127 (2019)
This paper provides long-period and revised orbits for barium and S stars adding to previously published ones. The sample of barium stars with strong anomalies comprise all such stars present in the Lu et al. catalogue. We find orbital motion for all
Externí odkaz:
http://arxiv.org/abs/1904.03975
Autor:
Karinkuzhi, D., Van Eck, S., Jorissen, A., Goriely, S., Siess, L., Merle, T., Escorza, A., Van der Swaelmen, M., Boffin, H. M. J., Masseron, T., Shetye, S., Plez, B.
Publikováno v:
A&A 618, A32 (2018)
Barium stars are s-process enriched giants. They owe their chemical peculiarities to a past mass transfer phase. During which they were polluted by their binary companion, which at the time was an AGB star, but is now an extinct white dwarf. Barium s
Externí odkaz:
http://arxiv.org/abs/1807.06332
Autor:
Escorza, A., Boffin, H. M. J., Jorissen, A., Van Eck, S., Siess, L., Van Winckel, H., Karinkuzhi, D., Shetye, S., Pourbaix, D.
Publikováno v:
A&A 608, A100 (2017)
With the availability of parallaxes provided by the Tycho-Gaia Astrometric Solution, it is possible to construct the Hertzsprung-Russell diagram (HRD) of barium and related stars with unprecedented accuracy. A direct result from the derived HRD is th
Externí odkaz:
http://arxiv.org/abs/1710.02029