Estimating absolute magnitudes and colors of A-F supergiants from near-infrared features. I - The Northern Hemisphere

Details Estimating absolute magnitudes and colors of A-F supergiants from near-infrared features. I - The Northern Hemisphere Estimating absolute magnitudes and colors of A-F supergiants from near-infrared features. I - The Northern Hemisphere

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....105.1967s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 105, no. 5, p. 1967-1972.

Astronomy and Astrophysics

Astronomy

6

A Stars, F Stars, Northern Hemisphere, Stellar Color, Stellar Luminosity, Stellar Magnitude, Supergiant Stars, Cepheid Variables, Charge Coupled Devices, Galactic Clusters, Magellanic Clouds

Scientific paper

In this paper we consider the calibration of the luminosity sensitive O I 7774 A feature in the A and F supergiants. We have obtained 2-3 A resolution CCD spectra of this feature for nine A and F supergiants in northern Galactic clusters. The new data, additional cluster members, and improvements in the various distance estimates have substantially improved the calibration. We show that the intrinsic rms dispersion about the resulting M(V)-W(lambda) relation for A and F supergiants is comparable to that of the Cepheid period luminosity relation in the visual. We have also found that an index measuring the strength of the infrared calcium triplet provides an excellent indicator of intrinsic color among these stars. Together, these two relations suggest that A and F supergiants could usefully be employed as standard candles out to at least 5 Mpc.

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