Infrared photometry of red supergiants in young clusters in the Magellanic Clouds

Stefan C. Keller

doi:10.1086/300991

Infrared photometry of red supergiants in young clusters in the Magellanic Clouds

Stefan C. Keller

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

We present broadband infrared photometry for 52 late-type supergiants in the young Magellanic Cloud clusters NGC 330, 1818, 2004, and 2100. Standard models are seen to differ in the temperature they predict for the red supergiant population by on the order of 300 K. It appears that these differences are most probably due to the calibration of the mixing-length parameter α_P in the outermost layers of the stellar envelope. Because α_P apparently depends on the model used, we do not quantitatively compare α_P between models. Qualitatively, we find that α_P decreases with increased stellar mass within standard models. We do not find evidence that α_P depends on metallicity.

Original language	English
Pages (from-to)	889-894
Number of pages	6
Journal	Astronomical Journal
Volume	118
Issue number	2
DOIs	https://doi.org/10.1086/300991
Publication status	Published - Aug 1999

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10.1086/300991

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title = "Infrared photometry of red supergiants in young clusters in the Magellanic Clouds",

abstract = "We present broadband infrared photometry for 52 late-type supergiants in the young Magellanic Cloud clusters NGC 330, 1818, 2004, and 2100. Standard models are seen to differ in the temperature they predict for the red supergiant population by on the order of 300 K. It appears that these differences are most probably due to the calibration of the mixing-length parameter αP in the outermost layers of the stellar envelope. Because αP apparently depends on the model used, we do not quantitatively compare αP between models. Qualitatively, we find that αP decreases with increased stellar mass within standard models. We do not find evidence that αP depends on metallicity.",

keywords = "Infrared radiation, Magellanic Clouds, Stars: late-type",

author = "Keller, {Stefan C.}",

year = "1999",

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AU - Keller, Stefan C.

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N2 - We present broadband infrared photometry for 52 late-type supergiants in the young Magellanic Cloud clusters NGC 330, 1818, 2004, and 2100. Standard models are seen to differ in the temperature they predict for the red supergiant population by on the order of 300 K. It appears that these differences are most probably due to the calibration of the mixing-length parameter αP in the outermost layers of the stellar envelope. Because αP apparently depends on the model used, we do not quantitatively compare αP between models. Qualitatively, we find that αP decreases with increased stellar mass within standard models. We do not find evidence that αP depends on metallicity.

AB - We present broadband infrared photometry for 52 late-type supergiants in the young Magellanic Cloud clusters NGC 330, 1818, 2004, and 2100. Standard models are seen to differ in the temperature they predict for the red supergiant population by on the order of 300 K. It appears that these differences are most probably due to the calibration of the mixing-length parameter αP in the outermost layers of the stellar envelope. Because αP apparently depends on the model used, we do not quantitatively compare αP between models. Qualitatively, we find that αP decreases with increased stellar mass within standard models. We do not find evidence that αP depends on metallicity.

KW - Infrared radiation

KW - Magellanic Clouds

KW - Stars: late-type

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U2 - 10.1086/300991

DO - 10.1086/300991

M3 - Article

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VL - 118

SP - 889

EP - 894

JO - Astronomical Journal

JF - Astronomical Journal

IS - 2

ER -

Infrared photometry of red supergiants in young clusters in the Magellanic Clouds

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