Variable Stars in the Magellanic Clouds: Results from OGLE and SIRIUS

Details Variable Stars in the Magellanic Clouds: Results from OGLE and SIRIUS Variable Stars in the Magellanic Clouds: Results from OGLE and SIRIUS

2003-10-03

arxiv.org/abs/astro-ph/0310083v1

Mon.Not.Roy.Astron.Soc. 347 (2004) 720

Astronomy and Astrophysics

Astrophysics

9 pages, 10 figures, accepted for publication in MNRAS. High resolution version is available at: http://www.ioa.s.u-tokyo.ac

Scientific paper

10.1111/j.1365-2966.2004.07257.x

We have performed a cross-identification between OGLE-II data and single-epoch SIRIUS JHK survey data in the LMC and SMC. After eliminating obvious spurious variables, we determined the pulsation periods for 9,681 and 2,927 variables in the LMC and SMC, respectively. Based on these homogeneous data, we studied the pulsation properties and metallicity effects on period-K magnitude (PK) relations by comparing the variable stars in the LMC and SMC. The sample analyzed here is much larger, and we found the following new features: (1) variable red giants in the SMC form parallel sequences on the PK plane, just like those found by Wood (2000) in the LMC; (2) both of the sequences A and B of Wood (2000) have discontinuities, and they occur at the K-band luminosity of the TRGB; (3) the sequence B of Wood (2000) separates into three independent sequences B+- and C'; (4) comparison between the theoretical pulsation models (Wood et al. 1996) and observational data suggests that the variable red giants on sequences C and newly discovered C' are pulsating in the fundamental and first overtone mode, respectively; (5) the theory can not explain the pulsation mode of sequences A+- and B+-, and they are unlikely to be the sequences for the first and second overtone pulsators, as was previously suggested; (6) the zero points of PK relations of Cepheids in the metal deficient SMC are fainter than those of LMC ones by ~0.1 mag but those of SMC Miras are brighter than those of LMC ones by ~0.13 mag, which are probably due to metallicity effects.

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