Physics
Scientific paper
Aug 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997esasp.402..323g&link_type=abstract
Proceedings of the ESA Symposium `Hipparcos - Venice '97', 13-16 May, Venice, Italy, ESA SP-402 (July 1997), p. 323-326
Physics
2
Scientific paper
We present first results on late-type stars based on Hipparcos data for 42 stars that have their distances determined to better than 50 per cent. Luminosities are calculated from modelling the spectral energy distributions, or using a bolometric correction. For the two Miras in the sample first overtone pulsation can be excluded and the pulsation mode is the fundamental one. For three Semi Regular (SR) variables fundamental mode can be excluded. For all SRs first overtone pulsation always fits the observed periods better. For two SRs there may be evidence for pulsation in a higher mode. The periods and luminosities of the 2 Miras are consistent with the P-L relation determined for the LMC, when shifted by a distance modulus of 18.5. There are 5 R-type carbon stars in the sample. The brightest has a luminosity of 170 L_(solar). This confirms the low luminosity of these stars known previously from statistical parallax studies. Six stars in the sample show the 99^Tc line, and six do not. We find that the borderline luminosity above which most stars show Tc lies at 1500-2000 L_(solar). Bias of the Lutz-Kelker type may affect these conclusions.
de Jong Teije
Groenewegen Martin A. T.
Schrijver Hans
Slijkhuis Sander
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