1.5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- National Central UniversityTW30 papers
- University of DelhiIN28 papers
- Astronomical Observatory of CapodimonteIT18 papers
- University of Illinois Urbana-ChampaignUS18 papers
- University of TorontoCA18 papers
- Eötvös Loránd UniversityHU15 papers
- University of FloridaUS14 papers
- University of Maryland, College ParkUS14 papers
- Rochester Institute of TechnologyUS13 papers
- California Institute of TechnologyUS12 papers
- Center for Astrophysics Harvard & SmithsonianUS12 papers
- Cornell UniversityUS12 papers
19 papers · 1 filter
Period-Luminosity Relations Derived from the OGLE-III Fundamental Mode Cepheids
C. Ngeow, S. Kanbur, H. Neilson +2
In this Paper, we have derived Cepheid period-luminosity (P-L) relations for the Large Magellanic Cloud (LMC) fundamental mode Cepheids, based on the data released from OGLE-III. W…
Testing Mass Loss in Large Magellanic Cloud Cepheids using Infrared and Optical Observations
Hilding R. Neilson, Chow-Choong Ngeow, Shashi M. Kanbur +1
It has been claimed that Period-Luminosity relations derived from infrared observations of Large Magellanic Cloud (LMC) Cepheids are less dependent on the metallicity of the Cephei…
Modeling Mass-Loss and Infrared Excess in Large Magellanic Cloud Cepheids
Hilding R. Neilson, Chow-Choong Ngeow, Shashi M. Kanbur +1
The purpose of this preliminary work is to determine if Large Magellanic Cloud (LMC) Cepheids have stellar winds. If a Cepheid undergoes mass loss then at some distance from the st…
Non-Linear Cepheid Period-Luminosity Relation and the Interaction of Stellar Photosphere with Hydrogen Ionization Front
C. Ngeow, S. Kanbur
The Cepheid period-luminosity (P-L) relation is regarded as a linear relation (in log[P]) for a wide period range from ~2 to ~100 days. However, several recent controversial works…
The Period-Luminosity Relation for the Large Magellanic Cloud Cepheids Derived from Spitzer Archival Data
C. Ngeow, S. Kanbur
Using Spitzer archival data from the SAGE (Surveying the Agents of a Galaxy's Evolution) program, we derive the Cepheid period-luminosity (P-L) relation at 3.6, 4.5, 5.8 and 8.0 mi…
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…
Large Magellanic Cloud Distance from Cepheid Variables using Least Squares Solutions
C. Ngeow, S. Kanbur
Distance to the Large Magellanic Cloud (LMC) is determined using the Cepheid variables in the LMC. We combine the individual LMC Cepheid distances obtained from the infrared surfac…
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…
Nonlinear Period-Luminosity Relation for the Large Magellanic Cloud Cepheids: Myths and Truths
C. Ngeow, S. Kanbur
In this paper, we discuss and examine various issues concerning the recent findings that suggested the observed period-luminosity (P-L) relation for the Large Magellanic Cloud (LMC…
The Hubble Constant from Type Ia Supernova Calibrated with the Linear and Non-Linear Cepheid Period-Luminosity Relation
C. Ngeow, S. Kanbur
It is well-known that the peak brightness of the Type Ia supernovae calibrated with Cepheid distances can be used to determine the Hubble constant. The Cepheid distances to host ga…
Period-colour and amplitude-colour relations in classical Cepheid variables IV: The multi-phase relations
Chow-Choong Ngeow, Shashi Kanbur
The superb phase resolution and quality of the OGLE data on LMC and SMC Cepheids, together with existing data on Galactic Cepheids, are combined to study the period-colour (PC) and…
Period-color and amplitude-color relations in classical Cepheid variables III: The Large Magellanic Cloud Cepheid models
Shashi Kanbur, Chow-Choong Ngeow
Period-colour (PC) and amplitude-colour (AC) relations are studied for the Large Magellanic Cloud (LMC) Cepheids under the theoretical framework of the hydrogen ionization front (H…
Further empirical evidence for the non-linearity of the period-luminosity relations as seen in the Large Magellanic Cloud Cepheids
C. Ngeow, S. Kanbur, S. Nikolaev +3
(abridged) Recent studies, using OGLE data for LMC Cepheids in the optical, strongly suggest that the period-luminosity (PL) relation for the Large Magellanic Cloud (LMC) Cepheids…
The Linearity of the Wesenheit function for the Large Magellanic Cloud Cepheids
Chow-Choong Ngeow, Shashi Kanbur
There is strong evidence that the period-luminosity (PL) relation for the Large Magellanic Cloud (LMC) Cepheids shows a break at a period around 10 days. Since the LMC PL relation…
Determination of Cepheid parameters by light-curve template-fitting
N. R. Tanvir, M. A. Hendry, A. Watkins +3
We describe techniques to characterise the light-curves of regular variable stars by applying principal component analysis (PCA) to a training set of high quality data, and to fit…