Spectral Dependence of Angular Sizes for G7-M6 giants in the Near-Infrared

Details Spectral Dependence of Angular Sizes for G7-M6 giants in the Near-Infrared Spectral Dependence of Angular Sizes for G7-M6 giants in the Near-Infrared

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20114403v&link_type=abstract

American Astronomical Society Meeting 201, #144.03; Bulletin of the American Astronomical Society, Vol. 35, p.569

Astronomy and Astrophysics

Astronomy

Scientific paper

We present angular size measurements obtained with the Palomar Testbed Interferomter (PTI). Our sample includes 103 giant stars, with spectral types between G7 and M6. These objects represent the `well studied' subset of giant stars observed at PTI (> 4 samples per star, with an average of 17 samples per star). These objects have been rigorously vetted for binarity against the Hipparcos and FK6 catalogs. The PTI observations present `narrowband' angular sizes in 0.1 μ m increments across the K band, from 1.95 to 2.45 μ m, with narrowband channel centers located at 2.0, 2.1, 2.2, 2.3, and 2.4 μ m. There is strong evidence with later spectral types for a systematic increase in their 2.4 μ m sizes relative to the 2.2 μ m band center, with weaker evidence for a similar effect in the 2.3 μ m channel. There is little if any evidence for similar size differences between the 2.0 and 2.1 μ m channels, relative to the band center. By comparing this data to publicly available near-IR spectrophometric data for stars of similar spectral type, there is a clear correlation between the strength of spectral features, including the 12CO and 13CO bands that set in longwards of 2.29μ m, and the narrowband angular size differences.

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