Empirical amplitude-luminosity relation of S Doradus variables and extragalactic distances

Details Empirical amplitude-luminosity relation of S Doradus variables and extragalactic distances Empirical amplitude-luminosity relation of S Doradus variables and extragalactic distances

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217...87w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 87-91.

Astronomy and Astrophysics

Astrophysics

52

Blue Stars, Stellar Luminosity, Variable Stars, Light Curve, Stellar Envelopes, Stellar Magnitude, Stellar Temperature

Scientific paper

From recent detailed discussions of S Doradus variables, evidence has been provided that these luminous blue variables occupy at quiescence an inclined instability strip in the HRD in the luminosity-temperature range M(bol) = -9 - -11 and T(eff) = 14,000 - 35,000 K. S Dor variables occupy at maximum a vertical strip in the HRD at T of roughly 8000 K, called opaque wind limit. Since normal S Dor type eruptions occur under the condition M(bol) is roughly constant, the observed photometric variations in the visual and blue spectral range are virtually variations of B.C. As the instability strip is inclined the temperature difference between S Dor variables at quiescence and at maximum stage increases with L. Hence, the photometric amplitudes increase with L, indicating the existence of an amplitude-luminosity relation. A numerical expression for this relation is given. The absolute calibration is derived from the LMC-S Dor variables with well known distances. The relation is used to derive distances to other galaxies.

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