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AA1730026027.pdf902.02 kB
titleAKARI color useful for classifying chemical types of Miras
Author(jpn)松永, 典之
Author(eng)Matsunaga, Noriyuki
Author Affiliation(jpn)東京大学
Author Affiliation(eng)The University of Tokyo
Issue Date2018-03-09
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication titleJAXA Special Publication: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life
Start page167
End page170
Publication date2018-03-09
AbstractThe AKARI/IRC color combining the S9W and L18W bands is useful for distinguishing between oxygen-rich and carbon-rich circumstellar dust. Ishihara and collaborators found in 2011 that this color, used together with the near-IR color J - K(sub s), can be used to classify two groups of dust-enshrouded stars with different chemistry. They investigated the distributions of such dusty AGB stars in the Galaxy and found that those with oxygen-rich dust are more centrally concentrated. While this is consistent with previous studies, the map in Ishihara et al. shows that carbon-rich stars are also present in the Galactic bulge for which almost no carbon-rich stars were reported before. Here we focus on Mira variables whose distances can be well constrained based on the period-luminosity relation. Among some candidates of carbon-rich Miras selected by the AKARI color, we confirmed at least four carbon-rich Miras within the bulge with their optical spectra. This gives a new insight into the complicated nature of stellar populations in the bulge.
DescriptionMeeting Information: The 4th AKARI International Conference: The Cosmic Wheel and the Legacy of the AKARI archive: from galaxies and stars to planets and life (October 17-20, 2017. The University of Tokyo), Bunkyo-ku, Tokyo, Japan
Physical characteristics: Original contains color illustrations
会議情報: 第4回「あかり」国際会議 (2017年10月17-20日. 東京大学), 文京区, 東京
形態: カラー図版あり
Keywordsstars: AGB and post-AGB; stars: late-type; Galaxy: bulge; Galaxy: stellar content; infrared: stars
Document TypeConference Paper
JAXA Category特別資料
NASA Subject CategoryAstronomy
Report NoJAXA-SP-17-009E

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