Period-luminosity relation for M-type semiregular variables from Hipparcos parallaxes
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.- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- December 2004
- DOI:
- 10.1111/j.1365-2966.2004.08344.x
- Bibcode:
- 2004MNRAS.355..601Y
- Keywords:
-
- stars: distances;
- stars: fundamental parameters;
- stars: late-type;
- stars: oscillations