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Long Period Variables in Local Group dwarf Irregular Galaxies

Published online by Cambridge University Press:  30 December 2019

John Menzies Open the ORCID record for John Menzies [Opens in a new window]
John Menzies*
Affiliation:
South African Astronomical Observatory, PO Box 9, Observatory, 7935, South Africa email: [email protected]
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Abstract

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The long-term SAAO survey of Local Group galaxies in the near-infrared (JHKs) has included five dwarf irregulars (dIrr), namely, NGC 6822, IC 1613, WLM, Sgr dIG and NGC 3109. We have found long-period (Mira) variables in all of them. Most of the Miras, which follow a linear LMC period-luminosity (PL) relation well, are carbon-rich. A small group of oxygen-rich Miras are brighter than the linear PL relation predicts, presumably because they are undergoing hot-bottom burning (HBB).

Keywords

galaxies: Local Groupstars: AGBstars: variables: Mira
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S343: Why Galaxies Care About AGB Stars: A Continuing Challenge through Cosmic Time , August 2018 , pp. 472 - 473
Copyright
© International Astronomical Union 2019 

References

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