Other
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986aj.....91..890e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 91, April 1986, p. 890-918.
Other
33
Astronomical Photometry, Cepheid Variables, Giant Stars, Light Curve, Stellar Color, Abundance, Astronomical Catalogs, Asymptotic Giant Branch Stars, H Beta Line, R Coronae Borealis Stars, Stellar Evolution, Ubv Spectra
Scientific paper
Light and color curves in four-color, H-beta, and (RI) photometric systems are presented for 20 low-mass pseudocepheids. Members of the Wolf 630 group and the cluster M67 are used to establish the positions of both variable and nonvariable giants with near solar abundance in the luminosity-temperature plane for old disk population stars, while members of Omega Cen and of Kapteyn's Star Group are used for the low metal abundance halo giants. The low-mass pseudocepheids discussed are divided into two main categories, based on the amplitude of light variation. The smaller amplitude stars, characterized by R CrB and RY Sgr in the old disk population, show the R CrB syndrome of occasional deep light minima, as does UW Cen. The small amplitude variables in the halo population, BL Tel and LN Hya, do not show the R CrB syndrome and their periods are longer than those of old disk stars. Large amplitude variables, with periods ranging from 10 to 150 days, are all halo objects with stability of period and form of light curve an obvious function of the period. Cen and BL Tel are members of Kapteyn's Star Group, and the spectroscopic orbital elements of the latter indicate a mass near 0.5 solar mass for the pseudocepheid and 1 solar mass for the late-type giant companion. Far-infrared observations are important in exploring the correlations between the presence and character of circumstellar dust shells and other post-AGB star parameters.
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