The Nainital-Cape Survey-III : A Search for Pulsational Variability in Chemically Peculiar Stars - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




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Abstract: The Nainital-Cape survey is a dedicated research programme to search andstudy pulsational variability in chemically peculiar stars in the NorthernHemisphere. The aim of the survey is to search such chemically peculiar starswhich are pulsationally unstable. The observations of the sample stars werecarried out in high-speed photometric mode using a three-channel fastphotometer attached to the 1.04-m Sampurnanand telescope at ARIES. The newphotometric observations confirmed that the pulsational period of star HD25515is 2.78-hrs. The repeated time-series observations of HD113878 and HD118660revealed that previously known frequencies are indeed present in the new datasets. We have estimated the distances, absolute magnitudes, effectivetemperatures and luminosities of these stars. Their positions in the H-Rdiagram indicate that HD25515 and HD118660 lie near the main-sequence whileHD113878 is an evolved star. We also present a catalogue of 61 stars classifiedas null results, along with the corresponding 87 frequency spectra taken overthe time scale 2002-2008. A statistical analysis of these null results shows,by comparison with past data, that the power of the noise in the light curveshas slightly increased during the last few years.



Author: S. Joshi 1, D. L. Mary 2, N. K. Chakradhari 3, S. K. Tiwari 1, C. Billaud 2 1 ARIES, Manora Peak, Nainital, India, 2 Universit&#x

Source: https://arxiv.org/







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