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Related papers: Nonlinear Period-Luminosity Relation for the Large…

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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 break period at 10 days. Therefore, the aim of this Research…

Astrophysics · Physics 2009-11-13 C. Ngeow , S. Kanbur , A. Nanthakumar

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 microns for Large Magellanic Cloud (LMC) Cepheids. These P-L…

Astrophysics · Physics 2009-11-13 C. Ngeow , S. Kanbur

(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 shows a break or non-linearity at a period of 10 days. In…

Astrophysics · Physics 2009-04-13 C. Ngeow , S. Kanbur , S. Nikolaev , J. Buonaccorsi , K. Cook , D. Welch

We present a detailed statistical analysis of possible non-linearities in the Period-Luminosity (P-L), Period-Wesenheit (P-W) and Period-Color (P-C) relations for Cepheid variables in the LMC at optical ($VI$) and near-infrared ($JHK_{s}$)…

The period-luminosity (P-L) relation for Cepheid variables is important in modern astrophysics. In this work, we present the multi-band P-L relations derived from the Large Magellanic Cloud (LMC) and Small Magellanic Cloud (SMC) Cepheids,…

Solar and Stellar Astrophysics · Physics 2011-11-10 Chow-Choong Ngeow

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. We have applied an extinction map to correct for the…

Astrophysics · Physics 2009-11-13 C. Ngeow , S. Kanbur , H. Neilson , A. Nanthakumar , J. Buonaccorsi

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 is extensively used in distance scale studies, the…

Astrophysics · Physics 2009-11-11 Chow-Choong Ngeow , Shashi 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 have suggested that the P-L relation derived from the Large…

Astrophysics · Physics 2008-06-02 C. Ngeow , S. Kanbur

In this paper we present multi-band period-luminosity (P-L) relations for fundamental mode Cepheids in the SMC. The optical VI-band mean magnitudes for these SMC Cepheids were taken from the third phase of the Optical Gravitational Lensing…

Solar and Stellar Astrophysics · Physics 2015-08-06 Chow-Choong Ngeow , Shashi M. Kanbur , Anupam Bhardwaj , Harinder P. Singh

This paper discusses two aspects of current research on the Cepheid period-luminosity (P-L) relation: the derivation of mid-infrared (MIR) P-L relations and the investigation of multi-phase P-L relations. The MIR P-L relations for Cepheids…

Solar and Stellar Astrophysics · Physics 2015-06-04 Chow-Choong Ngeow , Shashi M. Kanbur , Earl P. Bellinger , Marcella Marconi , Ilaria Musella , Michele Cignoni , Ya-Hong Lin

In this paper the synthetic period-luminosity (P-L) relations in Spitzer's IRAC bands, based on a series of theoretical pulsation models with varying metal and helium abundance, were investigated. Selected sets of these synthetic P-L…

Solar and Stellar Astrophysics · Physics 2015-06-03 Chow-Choong Ngeow , Marcella Marconi , Ilaria Musella , Michele Cignoni , Shashi M. Kanbur

In this paper, we derive the period-luminosity (P-L) relation for Large Magellanic Cloud (LMC) Cepheids based on mid-infrared AKARI observations. AKARI's IRC sources were matched to the OGLE-III LMC Cepheid catalog. Together with the…

Solar and Stellar Astrophysics · Physics 2015-05-19 Chow-Choong Ngeow , Yoshifusa Ita , Shashi M. Kanbur , Hilding Neilson , Takashi Onaka , Daisuke Kato

We present multi-band Period-Luminosity (PL) relations for first-overtone mode Cepheids in the Small Magellanic Cloud (SMC). We derive optical band PL relations and the Wesenheit function using $VI$ mean magnitudes from the Optical…

Astrophysics of Galaxies · Physics 2016-03-23 Anupam Bhardwaj , Chow-Choong Ngeow , Shashi M. Kanbur , Harinder P. Singh

Photometric data for 593 Cepheids in the LMC, measured by Udalski et al. in the OGLE survey, augmented by 92 longer period Cepheids from other sources, are analyzed for the P-C and P-L relations, and for the variations of amplitude, light…

Astrophysics · Physics 2009-11-10 A. Sandage , G. A. Tammann , B. Reindl

In this paper we derive the Spitzer IRAC band period-luminosity (P-L) relations for the Small Magellanic Cloud (SMC) Cepheids, by matching the Spitzer archival SAGE-SMC data with the OGLE-III SMC Cepheids. We find that the 3.6micron and…

Solar and Stellar Astrophysics · Physics 2015-05-19 Chow-Choong Ngeow , Shashi M. Kanbur

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 previously applied to this problem: the testimator method and…

Astrophysics · Physics 2009-11-13 S. M. Kanbur , C. Ngeow , A. Nanthakumar , R. Stevens

We present the comparison between theoretical and empirical PL relations in V and I bands for the Large Magellanic Cloud. We found that, within the current intrinsic dispersions, theoretical predictions are in remarkable agreement with…

Astrophysics · Physics 2007-05-23 G. Bono , M. Marconi

We have applied the infrared surface brightness (ISB) technique to derive distances to 13 Cepheids in the LMC which span a period range from 3 to 42 days. From the absolute magnitudes of the variables calculated from these distances, we…

Astrophysics · Physics 2016-08-30 W. Gieren , J. Storm , T. G. Barnes , P. Fouque , G. Pietrzynski , F. Kienzle

We present new accurate Period-Luminosity (PL) and Period-Wesenheit (PW) relations in the V,J,Ks bands based on a sample of more than 4500 Cepheids in the Large Magellanic Cloud (LMC) whose photometry was obtained in the context of the…

Solar and Stellar Astrophysics · Physics 2020-03-02 V. Ripepi , R. Molinaro , M. Marconi , M. -R. L. Cioni

The VISTA Magellanic Cloud (VMC, PI M.R. Cioni) survey is collecting deep Ks-band time-series photometry of the pulsating variable stars hosted by the system formed by the two Magellanic Clouds (MCs) and the "bridge" connecting them. In…

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