Abundance analysis of Am binaries and search for tidally driven abundance anomalies - III. HD 116657, HD 138213, HD 155375, HD 159560, HD 196544 and HD 204188
نویسندگان
چکیده
منابع مشابه
The puzzling abundance pattern of HD 134439 and HD 134440 ⋆
Abundances of 18 elements are determined for the common proper-motion pair, HD134439 and HD 134440, which shows high [Mn/Fe] and low [α/Fe] ratios as compared to normal halo stars. Moreover, puzzling abundances are indicated from elements whose origins are normally considered to be from the same nucleosynthesis history. Particularly, we have found that [Mg/Fe] and [Si/Fe] are lower than [Ca/Fe]...
متن کاملHD 139614 , HD 142666 and HD 144432 : evidence for circumstellar disks ?
The morphology of the material surrounding Her-big Ae/Be stars is still a topic of debate. Distinct models with different geometry and optical thickness are found to be compatible with the observed IR excess. This indicates that it is not possible to resolve this question by only looking at the fluxes. Therefore, this paper compares three known Herbig Ae/Be stars with very similar energy distri...
متن کاملSub-Saturn Planetary Candidates of HD 16141 and HD 46375.
Precision Doppler measurements from the Keck High-Resolution Echelle Spectrograph reveal periodic Keplerian velocity variations in the stars HD 16141 and HD 46375. HD 16141 (G5 IV) has a period of 75.8 days and a velocity amplitude of 11 m s-1, yielding a companion having Msini=0.22 M(JUP) and a semimajor axis of a=0.35 AU. HD 46375 (K1 IV-V) has a period of 3.024 days and a velocity amplitude ...
متن کاملDiscovery of unusual pulsations in the cool , evolved Am stars HD 98851 and HD 102480
The chemically peculiar (CP) stars HD98851 and HD102480 have been discovered to be unusual pulsators during the “Naini Tal Cape Survey” programme to search for pulsational variability in CP stars. Time series photometric and spectroscopic observations of these newly discovered stars are reported here. Fourier analyses of the time series photometry reveal that HD98851 is pulsating mainly with fr...
متن کاملHD 30187 B and HD 39927 B : two suspected nearby hot subdwarfs in resolved binaries ?
In doing a BT , VT photometric solution for close Hipparcos double stars, based on the observations with the Tycho instrument of the Hipparcos satellite, we discovered two very blue subluminous components of HD 30187 and HD 39927. The position of the components on an observational HR diagram implies their being sdO or sdB hot subdwarfs. The only previously known sdO component of a visual binary...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2011
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2011.20108.x