Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 405, Issue 3, Pages 1711-1722Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2010.16603.x
Keywords
stars: AGB and post-AGB; stars: late-type; stars: Population II; stars: variables: general; stars: winds, outflows; globular clusters: individual: M15
Categories
Funding
- Particle Physics and Astronomy Research Council (PPARC)
- Science and Technology Facilities Council (STFC)
- UK Science and Technology Facilities Council
- STFC [ST/G009465/1, ST/G002355/1, PP/D000955/1, PP/F000057/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G002355/1, PP/D000955/1, PP/F000057/1, ST/G009465/1] Funding Source: researchfish
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We present a search for long-period variable (LPV) stars among giant branch stars in M15 which, at [Fe/H] similar to -2.3, is one of the most metal-poor Galactic globular clusters. We use multicolour optical photometry from the 0.6-m Keele Thornton and 2-m Liverpool Telescopes. Variability of delta V similar to 0.15 mag is detected in K757 and K825 over unusually long time-scales of nearly a year, making them the most metal-poor LPVs found in a Galactic globular cluster. K825 is placed on the long secondary period sequence, identified for metal-rich LPVs, though no primary period is detectable. We discuss this variability in the context of dust production and stellar evolution at low metallicity, using additional spectra from the 6.5-m Magellan (Las Campanas) telescope. A lack of dust production, despite the presence of gaseous mass loss raises questions about the production of dust and the intracluster medium of this cluster.
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