SIMBAD references

2012ApJ...754...35Y - Astrophys. J., 754, 35 (2012/July-3)

The period-luminosity relation of red supergiant stars in the Small Magellanic Cloud.


Abstract (from CDS):

The characteristics of light variation of red supergiant (RSG) stars in the Small Magellanic Cloud (SMC) are analyzed based on the nearly 8-10 year data collected by the ASAS and MACHO projects. The 126 identified RSGs are classified into five categories accordingly: 20 with poor photometry, 55 with no reliable period, 6 with semi-regular variation, 15 with a long secondary period (LSP) and distinguishable short period, and 30 with only an LSP. For the semi-regular variables and the LSP variables with distinguishable short period, the KS-band period-luminosity (P-L) relation is analyzed and compared with that of the Galaxy, the Large Magellanic Cloud, and M33. It is found that the RSGs in these galaxies obey a similar P-L relation except for those in the Galaxy. In addition, the P-L relations in the infrared bands, namely, the 2MASS JHKS, Spitzer/IRAC, and Spitzer/MIPS 24 µm bands, are derived with high reliability. The best P-L relation occurs in the Spitzer/IRAC [3.6] and [4.5] bands. Based on the comparison with the theoretical calculation of the P-L relation, the mode of pulsation of RSGs in the SMC is suggested to be the first-overtone radial mode.

Abstract Copyright:

Journal keyword(s): galaxies: individual: SMC - stars: oscillations - stars: variables: general - supergiants

VizieR on-line data: <Available at CDS (J/ApJ/754/35): table1.dat table3.dat table6.dat>

Simbad objects: 151

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