CCD photometry of the M 67 cluster in the Vilnius photometric system

Boyle, R. P.; Kazlauskas, A.; Vansevičius, Vladas; Straižys, V.; Vrba, F. J.; Sudzius, J.; Smriglio, F.

doi:10.1515/astro-1998-0302

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…Since the reddening of M67 is small and well known, and the NGC 7142 stars in our study are individually dereddened, we may directly intercompare intrin- sic colour indices of stars at turn-off points of both clusters. In our earlier study (Boyle et al 1998) it was found that the turn-off point of M67 is at (Y − V) 0 = 0.50, this corresponds to the spectral class close to F8, while in the present paper for NGC 7142 we have this colour at 0.46, corresponding to the spectral class F5. This can be interpreted that M67 is really older because metallicities of both clusters are not very different.…”

Section: Discussionsupporting

confidence: 47%

“…Thus, the appearance of CMD of NGC 7142 is somewhat different from those which are plotted directly from observational data and dereddened using a fixed value of the colour excess. The width of reddening-free cluster sequences in the CMD of NGC 7142, produced by our method, appears to be wider than the similar sequences of an old open cluster with low reddening, such as M67 (Boyle et al 1998).…”

Section: Intrinsic Colour-magnitude Diagrammentioning

confidence: 66%

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The open cluster NGC 7142: interstellar extinction, distance and age

Straižys¹,

Maskoliunas²,

Boyle³

et al. 2013

Monthly Notices of the Royal Astronomical Society

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The results of medium-band photometry of 1037 stars in the area of old open cluster NGC 7142 down to V = 20.1 mag in the Vilnius seven-colour system are presented. Photometric results are used to classify in spectral and luminosity classes about 80 % of stars down to V = 18.5 mag, to identify cluster members, to determine the main cluster parameters and to investigate the interstellar extinction in this direction. The average extinction A V of the cluster is about 1.1 mag (E B−V = 0.35), and its distance is 2.3 kpc (the distance modulus 11.8 mag). The age of the cluster, 3.0 Gyr, is estimated from the intrinsic colour-magnitude diagram with individual dereddening of each star and the Padova isochrones. The surface distribution of the extinction is shown. The reddening of the eclipsing variable V375 Cep is found to be close to the average reddening of the cluster. Probably, the cluster contains five red clump giants, two asymptotic branch stars and four blue stragglers.

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Section: Discussionsupporting

confidence: 47%

Section: Intrinsic Colour-magnitude Diagrammentioning

confidence: 66%

The open cluster NGC 7142: interstellar extinction, distance and age

Straižys¹,

Maskoliunas²,

Boyle³

et al. 2013

Monthly Notices of the Royal Astronomical Society

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“…We had several aims in view: e.g., automated photometric classification of a wide variety of stars (Smriglio et al 1986(Smriglio et al , 1988(Smriglio et al , 1990, CCD photometry in the Vilnius photometric system (Boyle et al 1990a,b;Boyle et al 1994;Dodd et al 1996;Boyle et al 1998;Smriglio et al 1998;Smriglio et al 2002), determination of interstellar extinction (Smriglio et al 1991;Boyle et al 1992;Janulis & Smriglio 1992), and the study of the cloudy structure of interstellar dust and the gas-to-dust ratio Smriglio et al 1995;Smriglio et al 1996). The observations of globular clusters give the opportunity of calibrating photometric systems in terms of temperature, luminosity, and metallicity, since these parameters, and the interstellar reddening of the cluster stars can be measured with rather good accuracy.…”

Section: Introductionmentioning

confidence: 99%

Photometric determination of the [Fe/H] ratio for the globular cluster M 92

Smriglio¹,

Dasgupta²,

Boyle

2006

A&A

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CCD observations of the northern globular cluster M 92 were obtained in the PXYVS colors of the Vilnius photometric system. The results for 230 stars in an area centered on the cluster and for 178 stars in an area west of the cluster down to V = 17.0 mag are presented. After a brief outline of the data pathway from observations to reduction via IRAF and a discussion of the photometric errors, the [Fe/H] ratio of the globular cluster M 92 is determined by multicolor PXYVS Vilnius photometry.

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Open Cluster IC 1369 and Its Vicinity: Multicolor Photometry and Gaia DR2 Astrometry

Straižys

Boyle

Raudeliunas

et al. 2020

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The open cluster IC 1369, located in Cygnus close to the galactic equator at the 89.°6 longitude, and its vicinity are investigated by applying two-dimensional photometric classification of stars down to V = 19 mag measured in the Vilnius seven-color photometric system. Employing the Gaia DR2 coordinates, parallaxes, and proper motions, 143 cluster members are found having cluster membership probabilities ≥0.75. The hottest stars of the evolved main sequence are of spectral class B9. Distances to the cluster, determined by two methods based on the Gaia parallaxes, are 3280 and 3370 pc with an uncertainty of 400–500 pc. Employing the physical HR diagram with the coordinates versus and the Padova isochrones, the cluster age is found to be between 300 and 350 Myr. Among the cluster members we identified six red giants of spectral classes G5–G8 and luminosities II–III, 17 Am stars, one Ap star, and one B5 blue straggler. The extinction shows a steep rise up to ∼2.0 mag at 300–700 pc, caused by the extensions of the dust cloud LDN 970 and the Great Cygnus Rift, and up to ∼2.5 mag at the edge of the Perseus arm at 3.0 kpc. The extinction is almost constant between 0.9 and 2.5 kpc from the Sun. The average extinction of the cluster members is 2.54 mag. A systematic error of color excesses found in the Argonaut calculator results is discussed.

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CCD photometry of the M 67 cluster in the Vilnius photometric system

Cited by 3 publications

References 23 publications

The open cluster NGC 7142: interstellar extinction, distance and age

The open cluster NGC 7142: interstellar extinction, distance and age

Photometric determination of the [Fe/H] ratio for the globular cluster M 92

Open Cluster IC 1369 and Its Vicinity: Multicolor Photometry and Gaia DR2 Astrometry

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