Absolute Magnitudes and Colors of A--F Supergiants from Near Infrared Features

Details Absolute Magnitudes and Colors of A--F Supergiants from Near Infrared Features Absolute Magnitudes and Colors of A--F Supergiants from Near Infrared Features

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...183.1712s&link_type=abstract

American Astronomical Society, 183rd AAS Meeting, #17.12; Bulletin of the American Astronomical Society, Vol. 25, p.1319

Astronomy and Astrophysics

Astronomy

Scientific paper

We consider the calibration of luminosities and intrinsic colors of A and F supergiants in terms of near infrared features. We calibrate M_V in terms of the equivalent width of the O{tenrm I lambda 7774} feature from a sample of 14 stars in 13 Galactic clusters. The rms dispersion about this relation is ~ 0.5 mag. Using this same sample, plus one association member, we calibrate (B-V)_deg in terms of the strength of the infrared Calcium triplet. The rms dispersion about this relation is 0.056 mag. We investigate these relations with a large sample of A and F supergiants in the Magellanic Clouds. The possibility of using these luminous stars as standard candles is discussed.

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