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The Hydrogen Ionization Front-Stellar Photosphere Interaction and the Period-Color Relations of Variable Stars
S. Kanbur, C. Ngeow, A. Nanthakumar
Recent evidence has emerged that the Cepheid PL relation in the LMC is nonlinear in the sense that the existing data are more consistent with two lines of differing slope with a br…
Testing the nonlinearity of the BVIcJHKs period-luminosity relations for the Large Magellanic Cloud Cepheids
C. Ngeow, S. Kanbur, A. Nanthakumar
A number of recent works have suggested that the period-luminosity (PL) relation for the Large Magellanic Cloud (LMC) Cepheids exhibits a controversial nonlinear feature with a bre…
Period-color and amplitude-color relations in classical Cepheid variables V: The Small Magellanic Cloud Cepheid models
S. Kanbur, C. Ngeow, G. Feiden
Period-colour (PC) and amplitude-colour (AC) relations at maximum, mean and minimum light are constructed from a large grid of full amplitude hydrodynamic models of Cepheids with a…
The Detailed Forms of the LMC Cepheid PL and PLC Relations
C. Koen, S. Kanbur, C. Ngeow
Possible deviations from linearity of the LMC Cepheid PL and PLC relations are investigated. Two datasets are studied, respectively from the OGLE and MACHO projects. A nonparametri…
Semi-Empirical Cepheid Period-Luminosity Relations in Sloan Magnitudes
C. Ngeow, S. Kanbur
In this paper we derive semi-empirical Cepheid period-luminosity (P-L) relations in the Sloan ugriz magnitudes by combining the observed BVI mean magnitudes from the Large Magellan…
Investigations of the Non-Linear LMC Cepheid Period-Luminosity Relation with Testimator and Schwarz Information Criterion Methods
S. M. Kanbur, C. Ngeow, A. Nanthakumar +1
In this paper, we investigate the linearity versus non-linearity of the Large Magellanic Cloud (LMC) Cepheid period-luminosity (P-L) relation using two statistical approaches not p…