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1741. BVI photometry of Galactic Cepheids
ID:
ivo://CDS.VizieR/J/A+A/404/423
Title:
BVI photometry of Galactic Cepheids
Short Name:
J/A+A/404/423
Date:
21 Oct 2021
Publisher:
CDS
Description:
321 Galactic fundamental-mode Cepheids with good B,V,I photometry by Berdnikov et al. (2000, Cat. <J/A+AS/143/211>) and with homogenized color excesses E(B-V) based on Fernie et al. (1995IBVS.4148....1F) are used to determine their period-colour relation in the range 0.4<log P<1.6. Distances of 25 Cepheids in open clusters (Feast, 1999PASP..111..775F) and of 28 Cepheids with BBW distances (Gieren et al., 1998ApJ...496...17G) are used in a first step to determine the absorption coefficients R_B_=4.17, R_V_=3.17, and R_I_=1.89. The two sets define two independent P-L relations which agree very well in slope. They are therefore combined into a single mean Galactic P-L relation.
1742. BVI photometry of LMC bar variables
ID:
ivo://CDS.VizieR/J/A+A/430/603
Title:
BVI photometry of LMC bar variables
Short Name:
J/A+A/430/603
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the Johnson-Cousins B,V and I time series data obtained for 162 variable stars (135 RR Lyrae, 4 candidate Anomalous Cepheids, 11 Classical Cepheids, 11 eclipsing binaries and 1 delta Scuti star) in two 13x13 square arcmin areas close to the bar of the Large Magellanic Cloud. The photometric observations presented in this paper were carried out at the 1.54m Danish telescope located in La Silla, Chile, on the nights 4-7 January 1999, UT, and 23-24 January 2001, UT, respectively. In the paper we give coordinates, finding charts, periods, epochs, amplitudes, and mean quantities (intensity- and magnitude-averaged luminosities) of the variables with full coverage of the light variations, along with a discussion of the pulsation properties of the RR Lyrae stars in the sample.
1743. BVI photometry of LMC Be stars
ID:
ivo://CDS.VizieR/J/MNRAS/361/1055
Title:
BVI photometry of LMC Be stars
Short Name:
J/MNRAS/361/1055
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present a catalogue with coordinates and photometric data of 2446 Be star candidates in the Large Magellanic Cloud (LMC), based on a search of the OGLE II data base. The I-band light curves of these stars show outbursts in 24% of the sample (Type-1 stars), high and low states in 10%, periodic variations in 6% (Type-3 stars), and stochastic variations in 60% of the cases. We report on the result of the statistical study of light curves of Type-1 and Type-3 stars in the LMC, and the comparison with the previously reported results of the Small Magellanic Cloud (SMC) sample.
1744. BVI photometry of M22
ID:
ivo://CDS.VizieR/J/MNRAS/349/1278
Title:
BVI photometry of M22
Short Name:
J/MNRAS/349/1278
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present wide field photometry of the Galactic Globular Cluster M 22 in the B, V and I passbands for more than 186,000 stars. The study is complemented by the photometry in two narrowband filters centered on H{alpha} and the adjacent continuum, and by infrared J, H and K magnitudes derived from the 2 MASS survey for ~2000 stars. Profiting from this huge database, we completely characterized the evolved stellar sequences of the cluster by determining a variety of photometric parameters, including new photometric estimates of the mean metallicity, reddening and distance to the cluster. In particular, from our multi-wavelength analysis, we re-examined the long-standing metallicity spread problem in M 22. According to our dataset, we conclude that most of the observed width of the red giant branch must be due to differential reddening, which amounts to a maximum of {Delta}E(B-V)~0.06, although the presence of a small metallicity spread cannot be completely ruled out. More specifically, the maximum metallicity spread allowed by our data is of the order of {Delta}[Fe/H]~0.1-0.2dex, i.e., not much more than what allowed by the photometric errors. Finally, we identified most of the known variable stars and peculiar objects in our field of view. In particular, we find additional evidence supporting previous optical identifications of the central star of the Planetary Nebula IRAS 18333-2357, which is associated with M 22.
1745. BVI photometry of M5 giant branch stars
ID:
ivo://CDS.VizieR/J/ApJ/611/323
Title:
BVI photometry of M5 giant branch stars
Short Name:
J/ApJ/611/323
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have tabulated lists of upper red giant, horizontal-, and asymptotic giant branch (RGB, HB, and AGB) stars in the globular cluster M5 that are complete to over 10' from the core for the RGB and AGB samples, and 8' for the HB sample. The large samples give us the most precise value of R_2_=N_AGB_/N_HB_ to date for a single globular cluster (0.176+/-0.018).
1746. BVI photometry of M33 star clusters
ID:
ivo://CDS.VizieR/J/AJ/134/2168
Title:
BVI photometry of M33 star clusters
Short Name:
J/AJ/134/2168
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of a survey for star clusters in M33 using HST WFPC2 archive images. We have found 104 star clusters, including 32 new ones, in the images of 24 fields that were not included in previous studies. Combining these with previous data in the literature, we increase the number of M33 star clusters found in the HST images to 242. We have derived BVI integrated photometry of these star clusters from the CCD images taken with the CFH12k mosaic camera at the CFHT.
1747. BVI photometry of M15 stars
ID:
ivo://CDS.VizieR/J/PASP/126/733
Title:
BVI photometry of M15 stars
Short Name:
J/PASP/126/733
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present new BVI photometry containing 40,000 stars of the Galactic globular cluster M15 (NGC 7078), covering a 25'x25' area centered on the cluster with a magnitude range from the tip of the red giant branch to 3 mag below the main sequence turnoff. Using {alpha}-enhanced Dartmouth Stellar Evolution Program models, we find an age of 13.0+/-1.0Gyr and distance modulus of (m-M)_V_=15.4+/-0.1 through isochrone fitting. Unlike previous works, we find good agreement between the observed completeness-corrected stellar luminosity function and models.
1748. BVI photometry of nearby galaxies
ID:
ivo://CDS.VizieR/J/A+AS/139/491
Title:
BVI photometry of nearby galaxies
Short Name:
J/A+AS/139/491
Date:
21 Oct 2021
Publisher:
CDS
Description:
Integrated CCD-photometry of the dwarf nearby galaxies in B, V and I (Cousins) bands is presented. The photometry was performed in increasing circular apertures.
1749. BVI photometry of NGC 2489
ID:
ivo://CDS.VizieR/J/MNRAS/377/1737
Title:
BVI photometry of NGC 2489
Short Name:
J/MNRAS/377/1737
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present CCD BVI photometry for the southern open cluster NGC 2489 and its surrounding field. The sample consists of 2182 stars measured in an area of 13.6'x13.6', extending down to V~21.5. These data are supplemented with CORAVEL radial-velocity observations for seven red giant candidates. A cluster angular radius of 6.7+/-0.6', equivalent to 3.5+/-0.3pc, is estimated from star counts carried out inside and outside the cluster region. The comparison of the cluster colour-magnitude diagrams with isochrones of the Padova group yields E(B-V)=0.30+/-0.05, E(V-I)=0.40+/-0.05 and V-MV=12.20+/-0.25 for logt=8.70 (t=500^+130^_-100_Myr) and Z=0.019. NGC 2489 is then located at 1.8+/-0.3kpc from the Sun and 25pc below the Galactic plane. The analysis of the kinematical data allowed us to confirm cluster membership for six red giants, one of them being a spectroscopic binary. A mean radial velocity of 38.13+/-0.33km/s was derived for the cluster red giants. The properties of a sample of open clusters aligned along the line of sight of NGC 2489 are examined.
1750. BVI photometry of NGC 2547
ID:
ivo://CDS.VizieR/J/MNRAS/335/291
Title:
BVI photometry of NGC 2547
Short Name:
J/MNRAS/335/291
Date:
21 Oct 2021
Publisher:
CDS
Description:
We have developed the techniques required to use Naylor's optimal photometry algorithm of to create colour-magnitude diagrams with well-defined completeness functions. To achieve this we first demonstrate that the optimal extraction is insensitive to uncertainties in the measured position of the star. We then show how to correct the optimally extracted fluxes such that they correspond to those measured in a large aperture, so aperture photometry of standard stars can be used to place the measurements on a standard system. The technique simultaneously removes the effects of a position-dependent point spread function. Finally, we develop a method called 'ghosting', which calculates the completeness corrections in the absence of an accurate description of the point spread function. We apply these techniques to the young cluster NGC 2547 (=C0809-491), and use an X-ray-selected sample to find an age of 20-35Myr and an intrinsic distance modulus of 8.00-8.15mag. We use these isochrones to select members from our photometric surveys. Our derived luminosity function shows a well-defined Wielen dip, making NGC 2547 the youngest cluster in which such a feature has been observed. Our derived mass function spans the range 0.1-6M_{sun}_ and is similar to that for the field and the older, more massive clusters M35 and the Pleiades, supporting the idea of a universal initial mass function.

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