SEMIREGULAR VARIABLES WITH PERIODS LYING BETWEEN THE PERIOD-LUMINOSITY SEQUENCES C′, C, AND D

被引:25
作者
Soszynski, I. [1 ]
Wood, P. R. [2 ]
机构
[1] Univ Warsaw Observ, PL-00478 Warsaw, Poland
[2] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
基金
澳大利亚研究理事会; 欧洲研究理事会;
关键词
infrared: stars; stars: AGB and post-AGB; stars: late-type; stars: oscillations (including pulsations); GRAVITATIONAL LENSING EXPERIMENT; ASYMPTOTIC GIANT BRANCH; LONG SECONDARY PERIODS; LARGE-MAGELLANIC-CLOUD; OGLE-III CATALOG; RED GIANTS; AGB STARS; ELLIPSOIDAL VARIABILITY; MIRA VARIABLES; PULSATION;
D O I
10.1088/0004-637X/763/2/103
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyze the distribution of semiregular variables and Mira stars in the period-luminosity plane. Our sample consists of 6169 oxygen-rich long-period variables in the Large Magellanic Cloud included in the OGLE-III Catalog of Variable Stars. There are many stars with periods that lie between the well-known sequences C and C'. Most of these stars are multi-periodic and the period ratios suggest that these stars oscillate in the same mode as the sequence C stars. Models suggest that this mode is the fundamental radial pulsation mode. The stars with primary periods between sequences C and C' preferentially lie on an additional sequence (named F), and a large fraction of these stars also have long secondary periods (LSPs) that lie between sequences C and D. There are also a small number of stars with primary periods lying between sequences C and D. The origin of this long-period variability is unknown, as is the cause of sequence D variability. In addition, the origin of sequence F is unknown but we speculate that sequence F variability may be excited by the same phenomenon that causes the LSPs.
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页数:7
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