THE<i>HUBBLE SPACE TELESCOPE</i>UV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. I. OVERVIEW OF THE PROJECT AND DETECTION OF MULTIPLE STELLAR POPULATIONS

Piotto, G.; Milone, A. P.; Bedin, L. R.; Anderson, Jay; King, Ivan R.; Marino, A. F.; Nardiello, D.; Aparicio, A.; Barbuy, B.; Bellini, Andrea; Brown, Thomas M.; Cassisi, S.; Cool, A. M.; Cunial, A.; Dalessandro, E.; D’Antona, Francesca; Ferraro, F. R.; Hidalgo, Sebastián L.; Lanzoni, B.; Monelli, M.; Ortolani, S.; Renzini, A.; Salaris, Maurizio; Sarajedini, Ata; Marel, Roeland P. van der; Vesperini, Enrico; Zoccali, M.

doi:10.1088/0004-6256/149/3/91

Cited by 462 publications

(493 citation statements)

References 106 publications

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“…Hubble Space Telescope photometry (e.g. Piotto et al 2015) allows to extend our analysis into the cluster centres and could potentially provide additional clues.…”

Section: Discussionmentioning

confidence: 99%

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

Vanderbeke

Propris

Rijcke

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We use the HB morphology of 48 Galactic GCs to study the radial distributions of the different stellar populations known to exist in globular clusters. Assuming that the (extremely) blue HB stars correspond to stars enriched in Helium and light elements, we compare the radial distributions of stars selected according to colour on the HB to trace the distribution of the secondary stellar populations in globular clusters. Unlike other cases, our data show that the populations are well mixed in 80% of the cases studied. This provides some constraints on the mechanisms proposed to pollute the interstellar medium in young globular clusters.

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“…Hubble Space Telescope photometry (e.g. Piotto et al 2015) allows to extend our analysis into the cluster centres and could potentially provide additional clues.…”

Section: Discussionmentioning

confidence: 99%

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

Vanderbeke

Propris

Rijcke

et al. 2015

Monthly Notices of the Royal Astronomical Society

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“…Several studies have revealed the existence of multiple stellar populations, having different chemical compositions, in globular clusters that have been subjected to a detailed abundance analysis (e.g., see Gratton, Carretta & Bragaglia 2012;Piotto et al 2015). M4 is no exception, and the presence and properties of two main populations is well documented in the literature (see e.g.…”

Section: Comparison With Independent Estimates Of Mass and Distancementioning

confidence: 99%

Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission

Miglio

Chaplin

Brogaard

et al. 2016

Mon. Not. R. Astron. Soc.

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116

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Asteroseismic constraints on K giants make it possible to infer radii, masses and ages of tens of thousands of field stars. Tests against independent estimates of these properties are however scarce, especially in the metal-poor regime. Here, we report the detection of solar-like oscillations in 8 stars belonging to the red-giant branch and red-horizontal branch of the globular cluster M4. The detections were made in photometric observations from the K2 Mission during its Campaign 2. Making use of independent constraints on the distance, we estimate masses of the 8 stars by utilising different combinations of seismic and non-seismic inputs. When introducing a correction to the ∆ν scaling relation as suggested by stellar models, for RGB stars we find excellent agreement with the expected masses from isochrone fitting, and with a distance modulus derived using independent methods. The offset with respect to independent masses is lower, or comparable with, the uncertainties on the average RGB mass (4 − 10%, depending on the combination of constraints used). Our results lend confidence to asteroseismic masses in the metal poor regime. We note that a larger sample will be needed to allow more stringent tests to be made of systematic uncertainties in all the observables (both seismic and non-seismic), and to explore the properties of RHB stars, and of different populations in the cluster.

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“…The power of using a combination of ultraviolet filters to separate multiple populations in CMDs has already been demonstrated by the studies of, for example, Milone et al (2012) and Piotto et al (2015). In this work, we use two wideband filters F 336W and F 438W together with the narrowband filter F 343N .…”

Section: The Choice Of the Filtersmentioning

confidence: 99%

The search for multiple populations in Magellanic Cloud clusters – I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121

Niederhofer¹,

Bastian²,

Kozhurina-Platais³

et al. 2016

Mon. Not. R. Astron. Soc.

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We started a photometric survey using the WFC3/UVIS instrument onboard the Hubble Space Telescope to search for multiple populations within Magellanic Cloud star clusters at various ages. In this paper, we introduce this survey. As first results of this programme, we also present multi-band photometric observations of NGC 121 in different filters taken with the WFC3/UVIS and ACS/WFC instruments. We analyze the colour-magnitude diagram (CMD) of NGC 121, which is the only "classical" globular cluster within the Small Magellanic Cloud. Thereby, we use the pseudo-colour C F 336W,F 438W,F 343N = (F 336W − F 438W ) − (F 438W − F 343N ) to separate populations with different C and N abundances. We show that the red giant branch splits up in two distinct populations when using this colour combination. NGC 121 thus appears to be similar to Galactic globular clusters in hosting multiple populations. The fraction of enriched stars (N rich, C poor) in NGC 121 is about 32%±3%, which is lower than the median fraction found in Milky Way globular clusters. The enriched population seems to be more centrally concentrated compared to the primordial one. These results are consistent with the recent results by Dalessandro et al. (2016). The morphology of the Horizontal Branch in a CMD using the optical filters F 555W and F 814W is best produced by a population with a spread in Helium of ∆Y =0.025±0.005.

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THEHUBBLE SPACE TELESCOPEUV LEGACY SURVEY OF GALACTIC GLOBULAR CLUSTERS. I. OVERVIEW OF THE PROJECT AND DETECTION OF MULTIPLE STELLAR POPULATIONS

Cited by 462 publications

References 106 publications

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

G2C2 – IV. A novel approach to study the radial distributions of multiple populations in Galactic globular clusters

Detection of solar-like oscillations in relics of the Milky Way: asteroseismology of K giants in M4 using data from the NASA K2 mission

The search for multiple populations in Magellanic Cloud clusters – I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121

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