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A Preliminary Test of the Calibration of the Hβ System in Terms of Absolute Magnitudes and Intrinsic Colours for Early-Type Stars

  • A. F. J. Moffat (a1), Th Schmidt-Kaler (a1) and N. Vogt (a1)

Abstract

The dependency of the Hβ-index on two physical parameters is briefly discussed. The previous calibration of Mv (β) (Fernie, 1965 or Crawford, 1971) is confirmed for main sequence O and B stars; however, the β-values of the later B-supergiants tend to be too large for their absolute magnitudes. The problem of filtering out stars with marginal emission is emphasized.

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Copyright

References

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Crawford, D. L., Glaspey, J. W., and Perry, C. L.: 1970, Astron. J. 75, 822.
Crawford, D. L. and Barnes, J. V.: 1970, Astron. J. 75, 946.
Crawford, D. L., Barnes, J. V., Hill, G., and Perry, C. L.: 1971, Astron. J. 76, 1048.
Crawford, D. L.: 1971, private communication.
Fernie, J. D.: 1965, Astron. J. 70, 575.
Graham, J. A.: 1967, Monthly Notices Roy. Astron. Soc. 135, 377.
Moffat, A. F. J. and Vogt, N.: 1973, Astron. Astrophys. Suppl. , in press.
Vogt, N. and Moffat, A. F. J.: 1972, Astron. Astrophys. Suppl. 7, 133.
Vogt, N. and Moffat, A. F. J.: 1973, Astron. Astrophys. Suppl. 9, 97.

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