Journal Article

Period–luminosity relation for M-type semiregular variables from <i>Hipparcos</i> parallaxes

C. Yeşilyaprak and Z. Aslan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 355, issue 2, pages 601-607
Published in print December 2004 | ISSN: 0035-8711
Published online December 2004 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2004.08344.x
Period–luminosity relation for M-type semiregular variables from Hipparcos parallaxes

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Abstract

We have studied the period–luminosity (P–L) relationships of oxygen-rich semiregular (SR) variables in several wavelength bands using Hipparcos parallaxes with an accuracy of better than 10 per cent. We have shown that there is a clear dependence on period of absolute magnitude in the U, B, V, R, IC, J, H, K, L, M, N, [12], [25], [60] and [100] bands, and that the slope of the linear Mλ– logP relation is a smooth function of wavelength. We point out that this relation can in principle be used to derive absolute bolometric magnitude as a function of period.

The behaviour of the second periods of SR variables in the P–L relation in the V and K bands is also discussed.

Keywords: stars: distances; stars: fundamental parameters; stars: late-type; stars: oscillations

Journal Article.  4269 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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