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Start Over Subject photometry Validation Level 2
7781. V446 Her V light curves
ID:
ivo://CDS.VizieR/J/AJ/141/121
Title:
V446 Her V light curves
Short Name:
J/AJ/141/121
Date:
21 Oct 2021
Publisher:
CDS
Description:
V446 Her is the best example of an old nova which has developed dwarf nova (DN) eruptions in the post-nova state. We report on observed properties of the long-term light curve of V446 Her, using photometry over 19 years.
7782. V1044 Her VR differential photometry
ID:
ivo://CDS.VizieR/J/other/NewA/48.58
Title:
V1044 Her VR differential photometry
Short Name:
J/other/NewA/48.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present new CCD photometric observations of V1044 Her obtained on May 22, 23 and 24, 2015. From our data, we derived five new light curve minimum times. Combining our new results with previously available CCD light minimum times, we derived an updated ephemeris and discovered that the period of this binary system exhibits an oscillation. The cyclic variation may be caused by the light-time effect via the presence of a third body or magnetic activity cycle. We calculated the corresponding period of the third body to be 14.1+/-1.4 years or magnetic cycle to be 12.2+/-0.7 years. We analyzed our new asymmetric light curves to obtain photometric solutions and starspot parameters using the Wilson and Devinney program. The final results show that V1044 Her is a contact binary system with a degree of contact factor f=3.220(+/-0.002)%.
7783. VI and CMT1 photometry of NGC 2627
ID:
ivo://CDS.VizieR/J/MNRAS/346/390
Title:
VI and CMT1 photometry of NGC 2627
Short Name:
J/MNRAS/346/390
Date:
21 Oct 2021
Publisher:
CDS
Description:
Charge-coupled device (CCD) photometry in the Johnson V, Kron-Cousins I and Washington CMT1 systems is presented in the field of the poorly known open cluster NGC 2627.
7784. VI and CT1 photometry in NGC 2324 field
ID:
ivo://CDS.VizieR/J/A+A/418/979
Title:
VI and CT1 photometry in NGC 2324 field
Short Name:
J/A+A/418/979
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have obtained CCD photometry in the Johnson V, Kron-Cousins I and CT_1_ Washington systems for NGC 2324, a rich open cluster located ~35{deg} from the Galactic anticentre direction. We measured V magnitudes and V-I colours for 2865 stars and T_1_ magnitudes and C-T_1_ colours for 1815 stars in an area of 13.6'x13.6' (pixel=0.4")
7785. VI and [Fe/H] of Fornax dSph RGB stars
ID:
ivo://CDS.VizieR/J/A+A/459/423
Title:
VI and [Fe/H] of Fornax dSph RGB stars
Short Name:
J/A+A/459/423
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of the DART imaging and CaII triplet (CaT) survey of the Fornax dwarf spheroidal galaxy (dSph) at ESO. We collected hundreds of low resolution spectra of Red Giant Branch (RGB) stars in the CaT region, using VLT/FLAMES in Medusa mode, with the GIRAFFE spectrograph (grating LR8, resolving power R~6500). We list the results for the targets with a S/N per Angstrom >10 and an error in velocity <5km/s, because we found this to be the minimum for an accurate determination of velocity and equivalent width. We checked the sample to weed out any spurious object (e.g., broken fibres, background galaxies, foreground stars, spectra not consistent with RGBs). We use a 2.5sigma cut from the system velocity to derive which stars are probable velocity members of the Fornax dSph. We transform the equivalent width of the CaT lines of probable velocity members into metallicity ([Fe/H]) using the relation derived by Rutledge et al. (1997PASP..109..907R) and combining the CaT lines as in Tolstoy et al. (2001MNRAS.327..918T). The errors in [Fe/H] are based on S/N computations and adjusted to agree with repeated measurements.
7786. V, I , and Gunn z imaging of Terzan 4
ID:
ivo://CDS.VizieR/J/A+A/319/850
Title:
V, I , and Gunn z imaging of Terzan 4
Short Name:
J/A+A/319/850
Date:
21 Oct 2021
Publisher:
CDS
Description:
We study the globular cluster Terzan 4 projected close to the Galactic center, by means of V, I and Gunn z Colour-Magnitude Diagrams. The images were obtained under exceptional seeing conditions (0.35"-0.55") at the ESO New Technology Telescope equipped with SUSI. We derive a reddening of E(B-V)=2.35 and a distance from the Sun d_{sun}_=8.3kpc for Terzan 4. From the similarity of the VI Colour-Magnitude Diagrams of Terzan 4 and M30, in particular the presence of a blue horizontal branch, it could be as metal-poor as [Fe/H]=~-2.0. It is therefore another blue horizontal branch globular cluster located close to the Galactic center.
7787. VI CCD photometry in NGC 6631
ID:
ivo://CDS.VizieR/J/other/BASI/29.519
Title:
VI CCD photometry in NGC 6631
Short Name:
J/other/BASI/29.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present VI CCD photometric observations of about 5500 stars up to a limiting magnitude of V~20 in an area of ~16'x16' around the cluster NGC 6631. The cluster parameters determined for the first time by fitting the theoretical isochrones in the V, (V-I) diagram of the cluster stars are E(V-I)=0.60+/-0.05mag, distance=2.6+/-0.5kpc, age=400+/-100Myr and metallicity, Z=0.05. The cluster diameter determined from the radial density profile is 4.8+-0.5pc. The mass function of the cluster has a slope of 2.1+/-05.
7788. V,I CCD photometry of NGC 6528
ID:
ivo://CDS.VizieR/J/A+AS/127/167
Title:
V,I CCD photometry of NGC 6528
Short Name:
J/A+AS/127/167
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present CCD photometry in V and I for the metal-rich globular cluster NGC 6528. A comparison with previous photometry reveals discrepancies of the order 0.1 to 0.2mag in V, emphasizing the need for independent photometry. As found previously, the giant branch (or the asymptotic giant branch, which cannot be distinguished) of the cluster extends to V-I=7. Population synthesis in V-I must take these red stars into account in order to understand integrated red colours of bulge populations. Currently available theoretical isochrones do not reproduce the shape of the RGB/AGB. The derivation of reliable values for reddening, distance and metallicity of NGC 6528 is hampered by uncertainties in the extrapolation to high metallicity, which dominate the absolute error rather than the photo metric uncertainty does. Together with other properties (old age derived from HST data, high radial velocity), this object is more likely a member of the bulge than of the disk population.
7789. VI CCD photometry of NGC 6553
ID:
ivo://CDS.VizieR/J/A+AS/135/391
Title:
VI CCD photometry of NGC 6553
Short Name:
J/A+AS/135/391
Date:
21 Oct 2021
Publisher:
CDS
Description:
X, Y pixel coordinates and V, I CCD photometric magnitudes of stars in cluster region NGC 6553. DAOPHOT photometric errors in V and (V-I) are also given.
7790. VIc, CT1 magnitudes in Trumpler 5
ID:
ivo://CDS.VizieR/J/MNRAS/349/641
Title:
VIc, CT1 magnitudes in Trumpler 5
Short Name:
J/MNRAS/349/641
Date:
21 Oct 2021
Publisher:
CDS
Description:
CCD observations in the Johnson V, Kron-Cousins I and the Washington system C and T_1_ passbands have been used to generate colour-magnitude diagrams (CMDs) reaching down to V~21.0mag and T_1_~19.0 for Trumpler 5, an old open cluster located towards the Galactic anticentre. Our data analysis confirms the existence of non-uniform extinction over the face of the cluster, the mean E(V-I) and E(C-T_1_) values being 0.80+/-0.05 and 1.17+/-0.15, respectively. Through comparison of the cluster CMDs with theoretical isochrones of the Geneva group, Washington Standard Giant Branches and measures of V and T_1_ indices, we derive the following values for the cluster apparent distance modulus, age, and metallicity: V-M_V_=13.80+/-0.30 (corresponding to a distance from the Sun of 2.4+/-0.5 kpc and 0.04kpc above the Galactic plane), t=5.0+/-0.5Gyr and [Fe/H]=-0.30+/-0.15. We estimate the cluster angular radius to be about 7.7 arcmin (=5.4pc) from star counts carried out within and outside the cluster field.