&lt;title&gt;Large-scale first-principles calculations of Fe-doped SrTiO&lt;formula&gt;&lt;inf&gt;&lt;roman&gt;3&lt;/roman&gt;&lt;/inf&gt;&lt;/formula&gt;&lt;/title&gt;

Piskunov, Sergei; Ėvarestov, R. A.; Kotomin, E. A.; Eglitis, R. I.; Börstel, G.

doi:10.1117/12.515663

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…22, there is a scatter of around the Salpeter value. Piskunov (1976) analysed the MF slopes of 61 open star clusters and found an average value of in the mass range of 1 to 25 M ⊙ . Similarly, in five young and well‐populated open clusters, Sagar et al (1986) derive an average value of within the mass range of 1.3 to 80 M ⊙ .…”

Section: Luminosity and Mass Functions Of The Clusters Under Studymentioning

confidence: 99%

A multicolour CCD photometric and mass function study of the distant southern open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253

Sagar

Munari

Boer

2001

Monthly Notices of the Royal Astronomical Society

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We derive cluster parameters and mass functions from new UBVRI CCD photometric observations of ∼3500 stars reaching down to for the distant southern open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253. For NGC 3105 and Hogg 15, CCD data are presented for the first time. The reddening is non‐uniform across the face of the young (age <300 Myr) clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15 and Pismis 20, with average values of 1.44, 0.52, 1.15 and 1.20 mag respectively, while it is uniform with average values of and 0.20 mag for the older clusters NGC 4815 and 6253 respectively. The values of colour excess ratios indicate the presence of normal interstellar reddening across the cluster regions studied here. Well‐defined main sequences can be seen in all the clusters. However, main‐sequence turn‐off points and subgiant branches are well defined only in the older clusters NGC 4815 and 6253. The distances to the clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253 are , , , , , and respectively, while the corresponding ages derived using theoretical convective core overshooting stellar evolutionary isochrones are , , , , , and respectively. In the mass range ∼, the mass functions of all clusters except for NGC 6253 have been studied. The slopes of their mass spectra agree within errors with the Salpeter value (1.35). The slope of the mass function for stars more massive than 10 M⊙ is almost the same as for the lower mass stars. The mass function slopes of clusters younger than 500 Myr seem to have no dependence on Galactic longitude, Galactocentric distance and cluster age. As the inherent uncertainties in the mass function determinations of young Galactic star clusters can produce internal scatter that is larger than the external scatter, we conclude that, above 1 M⊙, the initial mass function is universal with a slope of Salpeter value.

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Section: Luminosity and Mass Functions Of The Clusters Under Studymentioning

confidence: 99%

A multicolour CCD photometric and mass function study of the distant southern open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253

Sagar

Munari

Boer

2001

Monthly Notices of the Royal Astronomical Society

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“…In recent years, luminosity and mass functions have been determined for a number of open clusters using homogeneous photoelectric or CCD data and reliable cluster membership criteria (cf. Piskunov 1976;Sagar et al 1986Sagar et al , 1988Scalo 1986Scalo , 1998Kjeldsen & Fransden 1991;Phelps & Janes 1993;Massey 1995;Durgapal & Pandey 2001;Pandey et al 2005Pandey et al , 2007 and references therein). Although the average slope of the MF does not seem to be very different from the Salpeter (1955) value, Pandey et al (2001Pandey et al ( , 2005 found that the nature of the MF in open clusters does not remain the same over the entire region of the cluster and the slope of the MF steepens as radial distance from the cluster center increases.…”

Section: Introductionmentioning

confidence: 99%

Mass Functions and Photometric Binaries in Nine Open Clusters

Sharma

Pandey

Ogura

et al. 2008

The Astronomical Journal

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Using homogeneous CCD photometric data from the 105 cm Kiso Schmidt telescope covering a 50 × 50 field, we study the mass functions (MFs) of nine open clusters. The ages and Galactocentric distances of the target clusters vary from 16-2000 Myr and 9-10.8 kpc, respectively. The values of MF slopes vary from −1.1 to −2.1. The classical value derived by Salpeter in 1955 for the slope of the initial mass function (IMF) is Γ = −1.35. The MFs in the outer regions of the clusters are found to be steeper than in the inner regions, indicating the presence of mass segregation in the clusters. The MF slopes (in the outer region as well as the whole cluster) undergo an exponential decay with the evolutionary parameter τ (=age/relaxation time). It seems that the evaporation of low-mass members from outer regions of the clusters is not significant at larger Galactocentric distances. It is concluded that IMF in the anti-center direction of the Galaxy might have been steeper than the IMF in the opposite direction. A comparison of the observed color-magnitude diagrams (CMDs) of the clusters with synthetic CMDs gives a photometric binary content of ∼40%.

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<title>Large-scale first-principles calculations of Fe-doped SrTiO<formula><inf><roman>3</roman></inf></formula></title>

Cited by 2 publications

References 15 publications

A multicolour CCD photometric and mass function study of the distant southern open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253

A multicolour CCD photometric and mass function study of the distant southern open star clusters NGC 3105, NGC 3603, Melotte 105, Hogg 15, NGC 4815, Pismis 20 and NGC 6253

Mass Functions and Photometric Binaries in Nine Open Clusters

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