Stellar Evolution in Globular Clusters

Carney, Bruce W.

doi:10.1007/3-540-31634-5_1

Cited by 9 publications

(8 citation statements)

References 406 publications

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“…Taken at face value, these results would argue in favor of the possibility that, rather than featuring a uniform large-scale profile (characterizable by well-behaved mean metallicity and dispersion and/or spatial gradients), the metallicity structure of the inner halo may be bimodalor even multi-modal, with localized volumes having separate discrete metallicity distributions which are reminiscent of the nonuniform chemical structure observed in the outer halo (e.g., Carney 2000;Bland-Hawthorne & Freeman 2000). However, such a conclusion would be premature, because the data behind it are still limited at the present stage of this project.…”

Section: Mean Metallicities and Metallicity Gradientsmentioning

confidence: 97%

The new Basel high-latitude field star survey of the Galaxy

Rong

Buser

Karaali

2001

A&A

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Abstract. We discuss star count and three-color data for the two inner-Galaxy fields SA 107 and NGC 6171 observed in the new Basel RGU high-latitude field star survey. Our analysis is based on the structural models of the Galactic population components that were derived from the previous studies of seven fields mainly in the outer Galaxy (Buser et al. 1998, 1999, hereafter Papers I and II, respectively). Apart from the canonical structural parameters, we here explore some of the special conditions prevailing in the transition region from high to low latitudes approaching the Galactic bulge, such as interstellar reddening, preponderant sampling of giants, and possible large-scale radial metallicity gradients. We show that the data are consistent on a high confidence level with a model incorporating an old-thin disk with local mean metallicity These results provide an important further step toward a comprehensive and detailed mapping of the larger-scale density and metallicity structures of the Galaxy, to be derived from the full-survey data in 14 fields.

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Section: Mean Metallicities and Metallicity Gradientsmentioning

confidence: 97%

The new Basel high-latitude field star survey of the Galaxy

Rong

Buser

Karaali

2001

A&A

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“…This reduces the effect of uncertain corrections at the faint end of the GCLF (but of course introduces the assumption that the GCLF does indeed follow a Gaussian shape). Here we adopted the mean turnover of disk galaxies from Table 14 in Carney (2001) at M TO = −7.46 ± 0.08, i.e. V = 21.03.…”

Section: Globular-cluster Specific Frequencymentioning

confidence: 99%

Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys

Mora

Larsen²,

Kissler-Patig

2006

A&A

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“…Their absolute magnitudes appear to be quite restricted. The range of RR Lyrae luminosities is discussed, among others, in Carney (2001), Harris (2001), and Catelan (2005). Stellar variability studies of globular clusters are also of fundamental importance to understanding both stellar and cluster evolution, as well as to constrain the formation history of the Galaxy and its nearby satellites (Catelan 2005).…”

Section: Introductionmentioning

confidence: 99%

The Globular Cluster M15. I. Identification, Discovery, and Period Determination of Variable Stars

Corwin

Borissova

Stetson

et al. 2008

The Astronomical Journal

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We present new BVI CCD photometry for variables in the globular cluster M15. Our photometry was obtained using both the image subtraction package ISIS and DAOPHOT/ALLFRAME. The data were acquired in 2001 on two observing runs on 11 observing nights using the 2 m telescope of the Bulgarian National Astronomical Observatory "Rozhen" with a Photometrics CCD camera. For 39 previously known variables, we present a period for the first time, and improved periods were obtained for many previously known variables. Fourteen new variables are reported. We present updated Bailey diagrams for the cluster, and discuss its Oosterhoff classification. Although many of M15's RRab pulsators fall at an intermediate locus between Oosterhoff types I and II (OoII) in the Bailey diagram, we argue that M15 is indeed a bona fide OoII globular cluster. RR Lyrae variables provide crucial information for estimating globular cluster ages and distances, as summarized by Smith (1995). They are easily identified by their distinctive light curves and are bright enough to be observed to considerable distances. Their absolute magnitudes appear to be quite restricted. The range of RR Lyrae luminosities is discussed, among others, in Carney (2001), Harris (2001), andCatelan (2005). Stellar variability studies of globular clusters are also of fundamental importance to understanding both stellar and cluster evolution, as well as to constrain the formation history of the Galaxy and its nearby satellites (Catelan 2005).The variables in M15 were previously studied by Sandage et al. (1981), Bingham et al. (1984), Silbermann & Smith (1995), Butler et al. (1998),Ó Tuairisg et al. (2003, Zheleznyak & Kravtsov (2003, hereafter ZK03), andArellano et al. (2006) among others. In the present paper, we present the results of a new variability analysis of the cluster, carried out using both image-subtraction techniques and the standard DAOPHOT/ALLFRAME analysis. We provide periods for 39 previously known variables whose periods were unknown, improved periods for 50 previously known variables, and periods for 14 new variables. In Section 2, we discuss our observational material and reduction procedures. In Section 3, we present our periods and derived light curves in either absolute

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Stellar Evolution in Globular Clusters

Cited by 9 publications

References 406 publications

The new Basel high-latitude field star survey of the Galaxy

The new Basel high-latitude field star survey of the Galaxy

Imaging of star clusters in unperturbed spiral galaxies with the Advanced Camera for Surveys

The Globular Cluster M15. I. Identification, Discovery, and Period Determination of Variable Stars

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