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23 papers found.
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Membership, binarity and metallicity of red giants in the southern open cluster NGC 2354

We present new Coravel radial-velocity observations and photoelectric photometry in the UBV, DDO and Washington systems for a sample of red giant candidates in the field of the intermediate-age open cluster NGC 2354. Photometric membership probabilities show very good agreement with those obtained from Coravel radial velocities. The analysis of the photometric and kinematical...

Fundamental parameters of the highly reddened young open clusters Westerlund 1 and 2

We study the compact open clusters Westerlund 1 (BH 197) and Westerlund 2. We present CCD integrated spectroscopy for both clusters, and CCD imaging in the V and I bands for the former one. So far, Westerlund 1 is possibly the most reddened open cluster studied in detail (). It has an age of 8 ± 3 Myr and a distance from the Sun of  kpc. For Westerlund 2 we derive a visual...

Reddening and age of six poorly studied star clusters of the Large Magellanic Cloud derived from integrated spectra

Aims. To increase the number of studied star clusters (SCs) of the Large Magellanic Cloud (LMC), we present flux-calibrated integrated spectra in the optical range (λ = 3700–6800 Å) for six poorly studied LMC SCs of IVA type. This type corresponds to the age range between 200 and 400 Myr. We also aim at creating a new template spectrum representative of this age range at the...

Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry

We present CCD photometry in the Washington system C and T1 passbands down to  mag in the field of Tombaugh 1, a little studied open cluster located in the third Galactic quadrant. We measured T1 magnitudes and colours for a total of 1351 stars distributed throughout an area of . A cluster radius of was estimated from star counts in 100-pixel a side boxes distributed throughout...

The relatively young, metal-poor and distant open cluster NGC 2324

We have obtained CCD photometry in the Johnson V, Kron-Cousins I and CT1 Washington systems for NGC 2324, a rich open cluster located ~35° from the Galactic anticentre direction. We measured V magnitudes and  colours for 2865 stars and T1 magnitudes and  colours for 1815 stars in an area of 136  136. The comparison of the cluster colour–magnitude diagrams with isochrones of the...

Photometric and Coravel observations of red giant candidates in three open clusters: membership, binarity, reddening and metallicity

Aims.We present new CORAVEL radial-velocity observations and photoelectric photometry in the and  systems for a sample of potential members of the red-giant branches of NGC 6192, NGC 6208 and NGC 6268, three open clusters projected close to the Galactic center direction. We also examine the properties of a sample of 42 inner disk open clusters projected towards almost the same...

Photometric and Coravel observations of red giant candidates in three open clusters: membership, binarity, reddening and metallicity

Aims.We present new CORAVEL radial-velocity observations and photoelectric photometry in the and  systems for a sample of potential members of the red-giant branches of NGC 6192, NGC 6208 and NGC 6268, three open clusters projected close to the Galactic center direction. We also examine the properties of a sample of 42 inner disk open clusters projected towards almost the same...

Photometric and spectroscopic study of low mass embedded star clusters in reflection nebulae

An analysis of the candidate embedded stellar systems in the reflection nebulae vdBH-RN 26, vdBH-RN 38, vdBH-RN 53a, GGD 20, ESO 95-RN 18 and NGC 6595 is presented. Optical spectroscopic data from CASLEO (Argentina) in conjunction with near infrared photometry from the 2MASS Point Source Catalogue were employed. The analysis is based on source surface density, colour–colour and...

IC 2395 and BH 47: Only one open cluster in the Vela constellation

We report UBV photoelectric photometry for 273 stars in the fields of the open clusters IC 2395 and BH 47. Our postulate is that, rather than two different clusters in this region of Vela, there is only one, which we call . The cluster is centered at about , (2000), its angular diameter being ~. The analysis of the photometric data yields 61 probable cluster members and 16...

Ruprecht 3: An old star cluster remnant?

2MASS J and H photometry and integrated spectroscopy are employed to study the nature of the poorly populated compact concentration of stars Ruprecht 3, which was previously catalogued as an open cluster. The integrated spectrum remarkably resembles that of a moderately metal-rich globular cluster. The distribution of the object stars in the colour-magnitude diagram is compatible...

Multicolour photometry and Coravel observations of stars in the southern open cluster IC 2488

We present new UBV photoelectric observations of 119 stars in the field of the southern open cluster IC 2488, supplemented by DDO and Washington photometry and Coravel radial velocities for a sample of red giant candidates. Nearly 50% of the stars sampled – including three red giants and one blue straggler – are found to be probable cluster members. Photometric membership...

Integrated spectral study of reddened globular clusters and candidates

This paper presents integrated spectra in the range 6700 - 9500 for 20 Galactic globular clusters (and candidates) in the bulge and 5 others projected on the Galactic disk ( and ). Most of them are considerably reddened and are among those least studied in the literature. We derive reddening and metallicity from flux-calibrated spectra, thus providing independent information of...

Multicolour photometry of red giants in three southern open clusters

Reddenings, distances, abundances and other physical properties are determined from new UBV, DDO and Washington photometry of stars in the southern open clusters NGC 4349 (C1221 – 578), NGC 5316 (C1350 – 616), and NGC 6494 (C1753 – 190). The application of two photometric membership criteria allowed us to discriminate between red field objects and physical members of the clusters...

Photometric study of the open cluster NGC 2323

UBV photoelectric photometry for 175 stars in the field of the southern open cluster NGC 2323, supplemented by DDO photometry of 5 probable giants, is presented. The analysis of the photometric data yields 109 probable members; one of them being a red giant, and 3 possible members. The reddening across the cluster is slightly variable and the mean value . The apparent cluster...

Fundamental parameters of the highly reddened young open clusters Westerlund 1 and 2

We study the compact open clusters Westerlund 1 (BH 197) and Westerlund 2. We present CCD integrated spectroscopy for both clusters, and CCD imaging in the V and I bands for the former one. So far, Westerlund 1 is possibly the most reddened open cluster studied in detail (). It has an age of 8 ± 3 Myr and a distance from the Sun of  kpc. For Westerlund 2 we derive a visual...

A UBV and DDO astrophysical study of the open cluster NGC 3532

Photoelectric photometry in the UBV and DDO systems is presented for 12 stars on the red giant branch of the open cluster NGC 3532. Two independent criteria have been applied to each observed star to assign membership probabilities. The results are in good agreement with those obtained from previous proper motion studies. A mean reddening $E(B-V)=0.07\pm0.02$ has been derived...

Red giants in open clusters - IX. NGC 2324, 2818, 3960 and 6259

We present accurate radial velocities and photoelectric UBV photometry for 73 and 57 red-giant candidates, respectively, in the intermediate-age open clusters NGC 2324, 2818, 3960 and 6259. These data confirm the membership of 47 stars, 12 of which (26% ) are spectroscopic binaries; three preliminary orbits have been determined in NGC 3960. From Washington photometry of 8 red...

Integrated spectral properties of 7 galactic open clusters

This paper presents flux-calibrated integrated spectra in the range 3600-9000 Å for 7 concentrated, relatively populous Galactic open clusters. We perform simultaneous estimates of age and foreground interstellar reddening by comparing the continuum distribution and line strengths of the cluster spectra with those of template cluster spectra with known parameters. For five...

Integrated spectral properties of 7 galactic open clusters

This paper presents flux-calibrated integrated spectra in the range 3600-9000 Å for 7 concentrated, relatively populous Galactic open clusters. We perform simultaneous estimates of age and foreground interstellar reddening by comparing the continuum distribution and line strengths of the cluster spectra with those of template cluster spectra with known parameters. For five...

New photometric data for the red giants in the open cluster NGC 5822: membership, chemical composition and physical properties

New photoelectric UBV, DDO, and CMT1T2 data of 14 G and K stars in the field of the open cluster NGC 5822 are presented. By applying two independent photometric criteria 11 stars are found to have a high probability of being cluster giants, while three remaining stars are almost certainly red field objects. A reddening $E(B-V)=0.15\pm0.01$, a distance modulus of $V_0-M_V=8.77\pm0...