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Markov Chain Monte Carlo optimization applied to double stars from Miller & Pitman research
Budding, Edwin; Rhodes, Michael D.; Banks, Timothy +1 more
Model orbits have been fitted to 27 physical double stars listed in a 1922 catalog. A Markov Chain Monte Carlo technique was applied to estimate best-fitting values and associated uncertainties for the orbital parameters. Dynamical masses were calculated using parallaxes from the Hipparcos mission and are presented in this paper with the estimates…
Observations of bright stars with AstroSat soft X-ray telescope
Singh, K. P.; Dewangan, G. C.; Bhattacharyya, S. +5 more
We present observations of four bright stars observed with the AstroSat Soft X-ray Telescope (SXT). Visible light from bright stars like these can leak through the very thin filter in front of the CCD in the focal plane CCD camera of the SXT and thus making the extraction of X-ray events difficult. Here, we show how to extract the X-ray events wit…
Identifying Li-rich giants from low-resolution spectroscopic survey
Zhao, Gang; Kumar, Yerra Bharat; Reddy, Bacham Eswar
In this paper we discuss our choice of a large unbiased sample used for the survey of red giant branch stars for finding Li-rich K giants, and the method used for identifying Li-rich candidates using low-resolution spectra. The sample has 2000 giants within a mass range of 0.8 to
Stellar parameters of the two binary systems: HIP 14075 and HIP 14230
Al-Wardat, Mashhoor A.; Pathan, J. M.; Masda, Suhail G.
We present the stellar parameters of the individual components of the two old close binary systems HIP 14075 and HIP 14230 using synthetic photometric analysis. These parameters are accurately calculated based on the best match between the synthetic photometric results within three different photometric systems with the observed photometry of the …
The Mass/Eccentricity Limit in Double Star Astronomy
Dommanget, J.
A research that we conducted in 1963 on the evolution of the binaries based on the available orbital data to obtain a philosophical degree, led to the establishment of an interesting and new diagram between the logarithm of the total mass and a particular parameterX, bound to the areal constant. This appeared to have a real physical significance b…