Observations of late-type variable stars in the water vapor radio line. The long-period variable R cassiopeia

2004 ◽  
Vol 48 (5) ◽  
pp. 380-392 ◽  
Author(s):  
M. I. Pashchenko ◽  
G. M. Rudnitskii
Keyword(s):  
Water Vapor ◽  
Variable Stars ◽  
Late Type ◽  
Radio Line ◽  
Long Period ◽  
Type Variable ◽  
Period Variable

scholarly journals Investigation of a Sample of Long-Period Variable Stars Possessing Maser Emission

1989 ◽  
Vol 106 ◽  
pp. 298-298 ◽  
Author(s):  
I.L. Andronov ◽  
L.S. Kudashkina ◽  
G.M. Rudnitskij
Keyword(s):  
Light Curve ◽  
Variable Stars ◽  
Spectral Lines ◽  
Asymptotic Giant Branch ◽  
Late Type ◽  
Maser Emission ◽  
Long Period ◽  
Ceti Type ◽  
Period Variable ◽  
Cas A

An investigation of parameters of a sample of more than two hundred late-type long-period variable stars (LPVs) has been carried out. In more detail were studied 13 giants (Mira Ceti-type variables R Aql, RR Aql, RT Aql, R Leo, U Ori, U Her, R Cas, R Tau, Z Cyg, R Peg, U Aur and semiregular variables RT Vir and RX Boo) and 2 supergiants (S Per, PZ Cas). A considerable fraction of the sample stars (about one third) possess circumstellar maser emission in molecular spectral lines (OH, H20, SiO). Our aim was to elucidate the particularities of photometric characteristics of maser stars, such as period P, amplitude A, light curve asymmetry f = (M-m)/P, and, in prospect, to determine their status in course of their evolution on the asymptotic giant branch. An extensive comparison with non-maser LPVs was made.

scholarly journals Observations of Long Period Variable Stars

1989 ◽  
Vol 106 ◽  
pp. 241-257
Author(s):  
T. Lloyd Evans
Keyword(s):  
Chemical Composition ◽  
Stellar Population ◽  
Variable Stars ◽  
Circumstellar Dust ◽  
Stellar Systems ◽  
Intrinsic Properties ◽  
Long Period ◽  
Large Samples ◽  
Period Variable ◽  
Infrared Wavelengths

The study of long period variable stars has been transformed in recent years by two observational developments. Large samples of stars have been observed at infrared wavelengths, providing knowledge of the intrinsic properties of the star as well as of circumstellar dust shells, and these observations have been extended to the variables in well defined stellar systems to allow their properties to be studied in relation to the stellar population to which they belong. Spectroscopic determinations of chemical composition have also provided several crucial insights.

scholarly journals The Evolving Radio Photospheres of Long-period Variable Stars

2018 ◽  
Vol 156 (1) ◽  
pp. 15 ◽  
Author(s):  
L. D. Matthews ◽  
M. J. Reid ◽  
K. M. Menten ◽  
K. Akiyama
Keyword(s):  
Variable Stars ◽  
Long Period ◽  
Period Variable
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