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The Wind Momentum - Luminosity Relationship of Galactic A- and B- Supergiants

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arxiv astro-ph/9910449 v1 pith:IHSQNQT7 submitted 1999-10-25 astro-ph

R. P. Kudritzki (1) , J. Puls (1) , D. J. Lennon , K. A. Venn , J. Reetz (1) , E. Najarro , J. K. McCarthy , A. Herrero ((1) Universitaetssternwarte Muenchen) This is my paper · ORCID
classification astro-ph
keywords spectralwindtypemomentamomentumstellarsupergiantsa-supergiants
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The Balmer lines of four A Ia - supergiants (spectral type A0 to A3) and fourteen B Ia and Ib - supergiants (spectral type B0 to B3) in the solar neighbourhood are analyzed by means of NLTE unified model atmospheres to determine the properties of their stellar winds, in particular their wind momenta. As in previous work for O-stars (Puls et al.) a tight relationship between stellar wind momentum and luminosity (`WLR'') is found. However, the WLR varies as function of spectral type. Wind momenta are strongest for O-supergiants, then decrease from early B (B0 and B1) to mid B (B1.5 to B3) spectral types and become stronger again for A-supergiants. The slope of the WLR appears to be steeper for A- and mid B-supergiants than for O-supergiants. The spectral type dependence is interpreted as an effect of ionization changing the effective number and the line strength distribution function of spectral lines absorbing photon momentum around the stellar flux maximum. This interpretation needs to be confirmed by theoretical calculations for radiation driven winds. A-supergiants in M31 observed with HIRES at the Keck telescope have wind momenta compatible with their galactic counterparts. The potential of the WLR as a new, independent extragalactic distance indicator is discussed. It is concluded that with ten to twenty objects, photometry with HST and medium resolution spectroscopy with 8m-telescopes from the ground distance moduli can be obtained with an accuracy of about 0.1m out to the Virgo and Fornax clusters of galaxies.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 9 citations worldwide. Full citation record

  1. Characterization of the variability of the blue supergiant HD 14134

    astro-ph.SR 2026-08 conditional novelty 5.0 of 10

    HD 14134 is a post-main-sequence blue supergiant with a 19.2-day g-mode pulsation and wind variability that may dominate its TESS brightness changes, questioning its alpha Cyg variable classification.

  2. Can current models predict the local black hole merger rate?

    astro-ph.HE 2026-06 unverdicted novelty 3.0 of 10

    Theoretical predictions for local BBH merger rates exceed observations by a factor >10 under conservative SFRD and metallicity assumptions, indicating need for revisions in stellar evolution.

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