Galactic Cluster Calibration of the MV--W_lambda (OI 7774 Angstroms) Relationship Among A and F Supergiants

Details Galactic Cluster Calibration of the MV--W_lambda (OI 7774 Angstroms) Relationship Among A and F Supergiants Galactic Cluster Calibration of the MV--W_lambda (OI 7774 Angstroms) Relationship Among A and F Supergiants

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.4411s&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #44.11; Bulletin of the American Astronomical Society, Vol. 24, p.801

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have obtained ~2 Angstroms resolution spectra of the OI triplet at 7774 Angstroms for 11 Galactic cluster A and F supergiants using the Coude Feed spectrograph at KPNO. Using these data to measure the equivalent widths, W_lambda (OI 7774 Angstroms), and using MV's from the literature, we have recalibrated this relationship. We compare this with the earlier calibration of Osmer(1972, ApJS 24, 247). We have also calibrated the intrinsic color, (B-V)_deg, in terms of a measure of the relative strength of three Calcium lines to the Paschen lines between 8200--8900 Angstroms among these same stars. The expected error in this fit should be better than .1 mag. We are also analyzing data on 56 Magellanic Cloud and 8 Southern Galactic cluster A and F supergiants obtained at CTIO. These data confirm and substantially strengthen previous calibrations of this feature as a luminosity indicator. We expect to use it to investigate problems in Galactic structure, and as a distance indicator to nearby late type galaxies.

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