Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21112701n&link_type=abstract
American Astronomical Society, AAS Meeting #211, #127.01; Bulletin of the American Astronomical Society, Vol. 39, p.957
Astronomy and Astrophysics
Astronomy
Scientific paper
Cepheid period-luminosity (PL) relation is well developed from optical (BVI) to near infrared (JHK) bands. In contrast the PL relations at longer wavelength is currently absent. A PL relation at longer wavelength (2-10 microns) is needed for the future distance scale studies from the observation of the James Webb Space Telescope. Therefore we derive the PL relations in 3.6,4.5,5.8 and 8.0 microns using the Spitzer Archival data. This was done by matching the known Large Magellanic Cloud Cepheids, mainly from the OGLE (Optical Gravitational Lensing Experiment) project, with the publicly avaibale data from the SAGE (Surveying the Agents of a Galaxy's Evolution) program. The results are given in the following Table.
| Wavelength (micron) | PL slope | PL zero-point |
| 3.6 | -3.26 | 15.95 |
| 4.5 | -3.22 | 15.93 |
| 5.8 | -3.17 | 15.85 |
| 8.0 | -3.09 | 15.68 |
Kanbur Shashi
Ngeow Chow Choong
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