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Astron. Astrophys. 317, 761-768 (1997)

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Determination of Miras temperatures from TiO and VO bands. Estimates of distances *

R. Alvarez and M.-O. Mennessier

GRAAL cc072, UPRESA 5024 CNRS/UMII, Université Montpellier II, F-34095 Montpellier Cedex 05, France

Received 25 January 1996 / Accepted 13 June 1996


Effective temperatures are determined for a sample of 165 oxygen-rich Miras using indices related to molecular band strength of titanium oxide and vanadium oxide computed from narrow-band photometry observations. We find a clear although very scattered period-temperature relation which agrees with a previous one. Using a theoretical evolutionary track on AGB and assuming that the scatter around the period-temperature relation is due to mass differences, we can obtain a period-luminosity relation similar to the one observed in the LMC if the mass range is 0.8 to 2.6 [FORMULA]. Effects of metallicity are discussed. The determined luminosities are used to calibrate distances that are compared to several other estimations.

Key words: stars: atmospheres – stars: distances – stars: fundamental parameters – stars: AGB and post-AGB

* Table 2 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: R. Alvarez, alvarez@graal.univ-montp2.fr

© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998