Spectral and luminosity variation of long-period red variable stars

Details Spectral and luminosity variation of long-period red variable stars Spectral and luminosity variation of long-period red variable stars

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..405c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 91, Feb. 1986, p. 405-415. Research supported by the Pontificia Universidad Catolica

Astronomy and Astrophysics

Astronomy

3

Red Giant Stars, Stellar Luminosity, Stellar Spectra, Variable Stars, Correlation, Mira Variables, Semiregular Variable Stars, Stellar Color, Stellar Magnitude

Scientific paper

An analysis of the visual (V) apparent-magnitude observations with simultaneous determination of the spectral subtype (S) of a long-period type Me stars, mainly Mira variables, is presented. For each star, there is a linear correlation between V and S (dMV = GdS, σG = 0.25). For a total of 16 stars, the slopes G were determined in the range of 0.30 to 2.11 mag per spectral subtype. For any moment of observation, the absolute magnitude obeys a linear relation MV = MVa+G(S-Sa), where MVa and Sa are the absolute magnitudes and spectrum at maximum light, respectively. Thus, it is possible to conclude that the instantaneous MV of any given Mira star depends only on the physical characteristics that involve the instantaneous spectral subtype S. Moreover, a best estimation of MVa is given by the function MV(P, Sa), where P is the period.

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