SIMBAD references

2010MNRAS.405.1711M - Mon. Not. R. Astron. Soc., 405, 1711-1722 (2010/July-1)

Discovery of long-period variable stars in the very metal-poor globular cluster M15.


Abstract (from CDS):

We present a search for long-period variable (LPV) stars among giant branch stars in M15 which, at [Fe/H] ∼ -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 δV ∼ 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.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): stars: AGB and post-AGB - stars: late-type - stars: Population II - stars: variables: general - stars: winds, outflows - globular clusters: individual: M15

VizieR on-line data: <Available at CDS (J/MNRAS/405/1711): stars.dat tablea1.dat tablea2.dat>

Simbad objects: 50

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