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Winardi Sutantyo
Department of Astronomy, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung,
Mathematics

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Journal : Jurnal Matematika

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Database and Animation Package of Stellar Evolution Study Mahaseana Putra; Muhamad Irfan Hakim; Aprilia Wardana; Winardi Sutantyo
Jurnal Matematika & Sains Vol 11, No 3 (2006)
Publisher : Institut Teknologi Bandung

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Abstract

The study of stellar evolution is an active major branch in astrophysics. Results from stellar evolution studies are indispensable for studies in some other areas such as chemical evolution of star clusters and galaxies. Recently theoretical/computational studies of stellar evolution often involve large populations of stars (~106) which need databases of evolution tracks with various realistic parameters (mass, chemical composition, etc). In this paper, an attempt in building such a database and construction of animations of the evolution of stellar internal structures and isochrones which is useful in teaching stellar evolution were described.
The Birth Rate of Low-Mass X-Ray Binaries Winardi Sutantyo
Jurnal Matematika & Sains Vol 8, No 3 (2003)
Publisher : Institut Teknologi Bandung

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Abstract

The evolutionary history and formation of low-mass X-ray binaries is considered. Various effects during their formation process are taken into account. Special emphasis is given to the common envelope evolution, the effect of an asymmetry in the supernova and the impact of the supernova shell on the companion star. Assuming a kick velocity between zero and 500 km s-1, the derived birthrate for low-mass X-ray binaries from the model computations is reconciable with estimated from the observed galactic population of O(100) and lifetime of O(108,7) yr if the common envelope efficiency is low (α CE ≤ 1,5). In this case, the derived birth rate depends only weakly on the kick velocity. Higher α CE results in a higher birthrate unless the kick velocity is also high (≥ 500 km s-1), which is incompatible with the observed mean velocity of pulsars. We conclude that the standard scenario produces a birthrate for low-mass X-ray binaries which is reconciable with the observations if α CE is low and this is valid for any kick velocity between zero and 500 km s-1.
Co-Authors Aprilia Wardana Mahaseana Putra Muhamad Irfan Hakim