Near-infrared Observations Of Cepheids In The Large Magellanic Cloud

Details Near-infrared Observations Of Cepheids In The Large Magellanic Cloud Near-infrared Observations Of Cepheids In The Large Magellanic Cloud

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541708m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #417.08; Bulletin of the American Astronomical Society, Vol. 42, p.272

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminary results of near-infrared (JHK) observations of Cepheids in the Large Magellanic Cloud. The aims of the project are: (1) to better characterize the Cepheid Period-Luminosity (P-L) relation at these wavelengths, especially for periods below 10 days, and (2) to determine if the relation is linear or non-linear in these bandpasses.
Several analyses of OGLE-II observations of Cepheids in the LMC have detected a non-linearity or "break" in the slope of the optical (V and I) P-L relations at a period of 10 days. Theoretical models indicate the non-linearity may be due to changes in the interaction of the hydrogen ionization front and the stellar photosphere as a function of global stellar parameters, such as mass and metallicity. Models predict that the non-linearity becomes most pronounced at abundances similar to that of the LMC.
We observed approximately 1,200 OGLE-II Cepheids (fundamental and first-overtone) with the CTIO 1.5-m telescope and the CPAPIR camera at JHK from November 2006 to December 2007. We collected data at 10 epochs per variable. We conducted PSF photometry and performed astrometric and photometric calibrations using the 2MASS Point Source Catalog.
In this poster, we present preliminary PL relations for the Cepheids in the J and K bands and color-magnitude diagrams for field stars.

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