M Star Spectra

Spectra for AD Leo and GJ644 from Segura, A., J.F. Kasting, V. Meadows, M. Cohen,J. Scalo, D. Crisp, R.A.H. Butler, G. Tinetti, Biosignatures from Earth-like planets around M dwarfs, Astrobiology, 5(6): 706-725, 2005. bibtex

publication erratum:
We are grateful to Dr. Mihalis Mathioudakis for pointing out to us that GJ643C (also called GJ644AB, V1054 Oph, and Wolf 630) has activity similar to that of AD Leo and is a binary companion of GJ643. The second active star described in our paper was in fact GJ643C and not GJ643, which is a star of low activity (Doyle et al. 1994, Astron.Astrophys., 285, 233-240). There are no IUE spectra for GJ643, only for GJ644AB.

The corrected label, GJ644 is used on this site.



The following plots and data are star fluxes at the distance of the star from Earth (4.9 parsecs for AD Leo, and 6.2 parsecs for GJ644). The publication shows fluxes for each star as they would be received at the top of the atmosphere of a planet in the habitable zone.


Data sets are linked here as .dat files. Please refer to the above paper, Segura, et.al. when making use of any of these data.


.dat file AD Leo







.dat file for GJ644



In our publication, three model stars were used along with the two observed stars above. Data for these M star models can be obtained from the BaSeL Interactive Server www.astro.mat.uc.pt/basel/