The distance of large Amplitude Red Variables

Details The distance of large Amplitude Red Variables The distance of large Amplitude Red Variables

Jun 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....99...58c&link_type=abstract

Astronomy and Astrophysics, vol. 99, no. 1, June 1981, p. 58-62. Research supported by the Universidad Catolica de Chile.

Astronomy and Astrophysics

Astrophysics

27

Astrometry, Interstellar Extinction, Red Giant Stars, Stellar Luminosity, Stellar Spectrophotometry, Variable Stars, Error Analysis, Galactic Structure, Stellar Magnitude

Scientific paper

It is pointed out that the determination of the distance for Large Amplitude Red Variables (LARV) has presented difficulties in connection with problems regarding the derivation of the visual absolute magnitude (Mv) of the variables. The considered investigation provides estimates of the distance of 43 LARV on the basis of a procedure which employs a new period-spectrum-luminosity relation to obtain Mv. The accuracy of the estimated values is discussed. For the relatively near stars, the accuracy is improved more than 50 percent. The error in the reported estimates is approximately 20 percent. For stars which do not show a very pronounced intrinsic variation from cycle to cycle, there may be an error of 15 percent regarding the estimated distance, if the Mv dispersion is plus or minus 0.3.

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