期刊
ASTROPHYSICAL JOURNAL
卷 723, 期 2, 页码 1195-1209出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/723/2/1195
关键词
infrared: stars; Magellanic Clouds; stars: AGB and post-AGB; stars: carbon; stars: variables: general
资金
- NASA [NAG5-12595, 1275598]
- U.S. Department of Energy through the University of California, Lawrence Livermore National Laboratory [W-7405-Eng-48]
- National Science Foundation through the Center for Particle Astrophysics of the University of California [AST-8809616]
- Mount Stromlo and Siding Spring Observatory
- Australian National University
We combine variability information from the MAssive Compact Halo Objects survey of the Large Magellanic Cloud with infrared photometry from the Spitzer Space Telescope Surveying the Agents of a Galaxy's Evolution survey to create a data set of similar to 30,000 variable red sources. We photometrically classify these sources as being on the first ascent of the red giant branch, or as being in one of three stages along the asymptotic giant branch (AGB): oxygenrich, carbon-rich, or highly reddened with indeterminate chemistry (extreme AGB candidates). We present linear period-luminosity (P-L) relationships for these sources using eight separate infrared bands (J, H, K(s), 3.6, 4.5, 5.8, 8.0, and 24 mu m) as proxies for the luminosity. We find that the wavelength dependence of the slope of the P-L relationship is different for different photometrically determined classes of AGB stars. Stars photometrically classified as O-rich show the least variation of slope with wavelength, while dust enshrouded extreme AGB stars show a pronounced trend toward steeper slopes with increasing wavelength. We find that O-rich AGB stars pulsating in the fundamental mode obey a period-magnitude relation with a slope of -3.41 +/- 0.04 when magnitude is measured in the 3.6 mu m band, in contrast to C-rich AGB stars, which obey a relation of slope -3.77 +/- 0.05.
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