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

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 d...

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Veröffentlicht in:	Monthly notices of the Royal Astronomical Society 2010-07, Vol.405 (3), p.1711-1722
Hauptverfasser:	McDonald, I., van Loon, J. Th, Dupree, A. K., Boyer, M. L.
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Sprache:	eng
Schlagworte:	Astronomy Earth, ocean, space Exact sciences and technology globular clusters: individual: M15 Metals outflows Stars & galaxies stars: AGB and post-AGB stars: late-type stars: Population II stars: variables: general stars: winds stars: winds, outflows
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creator	McDonald, I. van Loon, J. Th Dupree, A. K. Boyer, M. L.
description	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.
doi_str_mv	10.1111/j.1365-2966.2010.16603.x
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Th</creatorcontrib><creatorcontrib>Dupree, A. K.</creatorcontrib><creatorcontrib>Boyer, M. L.</creatorcontrib><title>Discovery of long-period variable stars in the very metal-poor globular cluster M15</title><title>Monthly notices of the Royal Astronomical Society</title><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><description>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. 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L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Discovery of long-period variable stars in the very metal-poor globular cluster M15</atitle><jtitle>Monthly notices of the Royal Astronomical Society</jtitle><stitle>Monthly Notices of the Royal Astronomical Society</stitle><addtitle>Monthly Notices of the Royal Astronomical Society</addtitle><date>2010-07</date><risdate>2010</risdate><volume>405</volume><issue>3</issue><spage>1711</spage><epage>1722</epage><pages>1711-1722</pages><issn>0035-8711</issn><eissn>1365-2966</eissn><coden>MNRAA4</coden><abstract>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. 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subjects	Astronomy Earth, ocean, space Exact sciences and technology globular clusters: individual: M15 Metals outflows Stars & galaxies stars: AGB and post-AGB stars: late-type stars: Population II stars: variables: general stars: winds stars: winds, outflows
title	Discovery of long-period variable stars in the very metal-poor globular cluster M15
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