Narrow-Band Photometry of Red Supergiants in the Small Magellanic Cloud

Details Narrow-Band Photometry of Red Supergiants in the Small Magellanic Cloud Narrow-Band Photometry of Red Supergiants in the Small Magellanic Cloud

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.4901w&link_type=abstract

American Astronomical Society Meeting 203, #49.01; Bulletin of the American Astronomical Society, Vol. 35, p.1284

Astronomy and Astrophysics

Astronomy

Scientific paper

A set of 36 red supergiants belonging to the Small Magellanic Cloud have been observed on a six-color narrow-band photometric system that measures continuum points and bands of TiO and CN, all in the near-infrared. The TiO--based spectral types range from The absolute magnitudes MV and M(104), based on a distance modulus of 18.9 mag and a very small correction for interstellar absorption, imply that the stars observed are Ia and Iab supergiants. Their CN--based luminosity classes, however, are mostly Ib. The difference is attributed to the effect of the lower metallicity of the SMC, relative to the Population I stars of the Milky Way, on the observed CN strength. These observations allow us to express the CN/luminosity calibration as a function of metallicity, thereby enhancing the usefulness of red supergiants as distance indicators for nearby galaxies of known metallicity.
The observations were made at Cerro Tololo Inter-American Observatory.

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