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Showing 1 to 20 of 32 for “"variable stars"”.
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Rapid oscillations in cataclysmic variable stars
… in the optical light curves of 24 cataclysmic variable stars (CVS). In 12 of these systems (TU Men, WW Cet, HX Peg, BP CrA, BR Lup, HP Nor, AG Hya, TW Vir, PU CMa, V426 Ooph, V1193 Ori, and CR Boo) for the first time. The results contribute to the observational record of the phenomenology of …
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Hierarchical Classification of Variable Stars Using Neural Networks
Variable stars play a prominent role in our study of the universe and are essential to estimating cosmological parameters. They are considered '‘standard candles’' due to their intrinsic variability, which allows their distances to be calculated. With the proliferation of large-scale sky surveys …
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Classification of Variable Stars using Convolutional Neural Network
… for the process of classifying and identifying variable stars through the analysis of unprocessed light curves from Transiting Exoplanet Survey Satellite (TESS). As astronomical data is becoming increasingly complex, and as advanced missions deploy sophisticated instruments for data collection, …
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An astrophysical investigation of four classical cepheid variable stars
… the periods and the brightnesses of cepheid variables in the Small Magellanic Cloud, these stars have been an extremely important source of distance information in astronomy . Numerous attempts were made following this discovery to calibrate the period-luminosity law and apply it to problems …
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An astrophysical investigation of four classical cepheid variable stars
… the periods and the brightnesses of cepheid variables in the Small Magellanic Cloud, these stars have been an extremely important source of distance information in astronomy . Numerous attempts were made following this discovery to calibrate the period-luminosity law and apply it to problems …
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The evolutionary state of the β CMa variable stars.
Thesis. 1976. B.S.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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The Density Distribution of The Rr Lyrae-Type Variable Stars
Made available in DSpace on 2014-12-10T17:12:32Z (GMT). No. of bitstreams: 1 6711935.pdf: 6838698 bytes, checksum: 3126add637ee5d33301a241ef7ec9e16 (MD5) Previous issue date: 1967
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Accretion processes in cataclysmic variable stars: insights from optical transient surveys
Cataclysmic variable (CV) stars are binary stars mostly characterised by accretion from a main sequence donor star to a white dwarf star. Multiple CV subclasses exist with varia tions in the nature of the CV, many of which have accretion discs surrounding the accretor. This study focuses on two …
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Autonomous lost in space and time state determination using periodic variable stars
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms
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Luminous blue variable stars: exploring the mass-loss history through a multiwavelength analysis of their ejecta
… analysis of ejecta around Luminous Blue Variable stars (LBVs), which are massive evolved stars subjected to high mass-loss episodes. In particular, the purpose of this thesis is to study the mass-loss history of a subsample of galactic and magellanic LBVs. We analysed data ranging from …
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Aluminum-hydride formation in the relaxation zones following shock waves in the atmosphere of long-period variable stars
<p>The phase variations of AlH emission lines in LPV spectra were investigated using a model of the post-shock relaxation zone. Conditions at the shock were linked to position in the atmosphere and phase by a global, isothermal shock model. In the relaxation zone model, 78 species were considered, …
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A Search for Low-Amplitude Variability Among Population I Main Sequence Stars
The detection of variable stars in open clusters is an essential component of testing stellar structure and evolution theories. The ability to detect low-amplitude variability among cluster members is directly related to the quality of the photometric results. Point Spread Function (PSF) fitting is …
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A survey of cataclysmic variables from the Edinburgh-Cape Blue object survey
… photometry and spectroscopy of the cataclysmic variable stars (GVs) found by the survey. Because of the north-south imbalance in the number of blue objects, the Edinburgh-Gape Blue Object survey was designed to discover previously unknown blue objects with B≤~18 at high galactic latitude in the …
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The identification and classification of variability in stellar sources observed with SuperWasp
… Survey (SuperW ASP) and to use the classified stars to investigate three phenomena: differentiation of Beta Lyrae and W UMa eclipsing binary stars using eclipse-depth ratio; identification of RR Lyrae stars exhibiting the Blazhko effect; and, the presence of the Oosterhoff dichotomy in the …
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Photometric techniques for exoplanet detection: the construction and deployment of the KELT-South telescope
… of the search for transiting exoplanets and variable stars using one of the first commissioning datasets obtained with the telescope. The KELT-South telescope is located in Sutherland, South Africa and construction started in 2008. The telescope has been operating at full capacity since 2010, …
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A study of the beta Cephei stars
The β Cephei stars are a group of short period variable stars which have been known to astronomers since shortly after the turn of the century. The group prototype, β Cephei, was found by Frost at Yerkes in 1902 while conducting radial velocity observations. The problems associated with …
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A study of the beta Cephei stars
The β Cephei stars are a group of short period variable stars which have been known to astronomers since shortly after the turn of the century. The group prototype, β Cephei, was found by Frost at Yerkes in 1902 while conducting radial velocity observations. The problems associated with …
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Variable star photometry in a secondary school curriculum
The author proved that photometry of variable stars can be performed by anyone using the shoestring budget of only a digital camera along with a laptop. Extrinsic variable star Algol was observed using a 14" telescope as well as CCD and had its light curve plotted. In direct comparison, V474 Mon …
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