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Astron. Astrophys. 331, 619-626 (1998)

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Extension of the effective temperature scale
of giants to types later than M6

G. Perrin 1, V. Coudé du Foresto 1, S.T. Ridgway 2, J.-M. Mariotti 1, W.A. Traub 3, N.P. Carleton 3 and M.G. Lacasse 3

1 Observatoire de Paris, DESPA, F-92195 Meudon, France
2 National Optical Astronomy Observatories, Tucson, AZ 85726-6732, USA
3 Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA

Received 23 May 1997 / Accepted 27 October 1997


Effective temperatures for nine giant stars are derived from recent diameter determinations at 2.2 µm with the FLUOR beam combiner on the IOTA interferometer. A good overlap with previous studies for stars earlier than M6 is verified. The present paper extends the temperature scale of giant stars based on direct measurements to types between M6 and M8.

Key words: techniques: interferometric – stars: atmospheres – fundamental parameters – late-type – infrared: stars

Send offprint requests to: G. Perrin (perrin@hplyot.obspm.fr)

© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998