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16911. VI light curves of SMC type II Cepheids
ID:
ivo://CDS.VizieR/J/AcA/60/91
Title:
VI light curves of SMC type II Cepheids
Short Name:
J/AcA/60/91
Date:
21 Oct 2021
Publisher:
CDS
Description:
The eighth part of the OGLE-III Catalog of Variable Stars (OIII-CVS) contains type II Cepheids in the Small Magellanic Cloud (SMC). The sample consists of 43 objects, including 17 BL Her, 17 W Vir and 9 RV Tau stars (first examples ever found in the SMC). Seven stars have been classified as peculiar W Vir stars - a recently identified subclass of type II Cepheids. These stars have distinctive light curves, are brighter and bluer than the ordinary W Vir variables. We confirm that a large fraction of the peculiar W Vir stars are members of binary systems.
16912. VI light-curves of the variable stars in M13
ID:
ivo://CDS.VizieR/J/A+A/398/541
Title:
VI light-curves of the variable stars in M13
Short Name:
J/A+A/398/541
Date:
21 Oct 2021
Publisher:
CDS
Description:
VI light-curves of variable stars in the globular cluster M13 are presented. They are based on the CCD observations carried out at the Bialkow station of the Wroclaw University Observatory using 60-cm reflecting telescope and the CCD camera. A 6x4 arcmin-squared field of view covering the core of the cluster was observed through V and I_C filters of the Johnson-Kron-Cousins UBV(RI)_C system. About 300 frames in both filters were taken during 23 nights between 2001 February 27 and August 1. The CCD images were analyzed with the DAOPHOT profile-fitting software and Image Subtraction Method. The main result of this study is discovery of five RR Lyrae and one SX Poenicis stars. Moreover we detect non-radial pulsations in RRc star v36. We also comment the variability of all observed suspected variable stars in M13.
16913. VI light curves of the variable stars in M92
ID:
ivo://CDS.VizieR/J/A+A/369/862
Title:
VI light curves of the variable stars in M92
Short Name:
J/A+A/369/862
Date:
21 Oct 2021
Publisher:
CDS
Description:
Results of a search for variable stars in the central region of the Oosterhoff II type globular cluster M 92 are presented. Out of the 28 variable and suspected variable stars listed in the Catalogue of Variable Stars in Globular Clusters (Clement, 1997, Cat. <V/97>) only two were not observed. Surprisingly, almost half of the observed suspected variables did not show any evidence of variability. Only one out of the 11 candidate RR Lyrae variables of Kadla et al. (1983PZ.....21..827K) appeared to be variable. Moreover, variable V7, until now classified as an RR Lyrae star with a period of about 0.515d, turned out to be of the BL Herculis type, with the period approximately twice that long. In addition, six new variables were found in the very core of the cluster: four of the RR Lyrae and the remaining two of the SX Phoenicis type. RRc variable V11 shows changes in the light curve shape. Due to the aliasing problems, however, we can state only that this star is biperiodic. There is a possibility that V11 belongs to the new group of recently discovered double-period RRc variables pulsating in non-radial mode. Altogether, light curves were obtained for 20 variable stars. The total number of known RR Lyrae stars in M92 equals now 17, 11 of type RRab and the remaining 6, RRc. The CCD observations presented here were carried out at the Bialkow station of the Wroclaw University Observatory with the same equipment as that described by Kopacki & Pigulski (1995AcA....45..753K). Two 6x4arcmin^2^ fields of view, one centred approximately on the core of M92 and the other shifted about 2.5arcmin north and 2.6arcmin east, were observed through V and I_c_ filters of the Johnson-Kron-Cousins UBV(RI)_c_ system. The observations were carried out in two seasons: on 9 nights between 1998 July 20 and September 1, and on 17 nights between 2000 May 4 and June 20. During the 1998 season only a few frames of the second field were taken. The main field, centred on the core of the cluster, was observed during both seasons.
16914. VI light curves of 10 variables in NGC288
ID:
ivo://CDS.VizieR/J/AcA/63/429
Title:
VI light curves of 10 variables in NGC288
Short Name:
J/AcA/63/429
Date:
21 Oct 2021
Publisher:
CDS
Description:
A search for variable stars in the globular cluster NGC 288 was carried out using a time-series of CCD images in the V and I filters. The photometry of all stellar sources in the field of view of our images, down to V~19mag, was performed using difference image analysis (DIA). For stars of~15mag, measurement accuracies of ~8mmag and ~10mmag were achieved for V and I respectively. Three independent search strategies were applied to the 5525 light curves but no new variables were found above the threshold limits characteristic of our data set. The use of older data from the literature combined with the present data allowed the refinement of the periods of all known variables. Fourier light curve decomposition was performed for the RRab and the RRc stars to obtain an estimate of [Fe/H]_ZW_=-1.62+/-0.02 (statistical) +/-0.14 (systematic). A true distance modulus of 14.768+/-0.003mag (statistical) +/-0.042mag (systematic), or a distance of 8.99+/-0.01kpc (statistical) +/-0.17kpc (systematic) was calculated from the RRab star. The RRc star predicts a discrepant distance about one kiloparsec shorter but it is possibly a Blazhko variable. An independent distance from the P-L relationship for SX Phe stars leads to a distance of 8.9+/-0.3kpc. The SX Phe stars V5 and V9 are found to be double mode pulsators.
16915. Vilnius photometry in a Cam area
ID:
ivo://CDS.VizieR/J/BaltA/14/1
Title:
Vilnius photometry in a Cam area
Short Name:
J/BaltA/14/1
Date:
21 Oct 2021
Publisher:
CDS
Description:
The paper gives the results of seven-color CCD photometry in the Vilnius system of 1376 stars down to 15.5mag in the area of the Galactic equator (l=146{deg}, b=+2.6{deg}) in Camelopardalis. Photometric spectral and luminosity classes, interstellar extinctions and distances of the stars are determined.
16916. Vilnius photometry in Barnard 1
ID:
ivo://CDS.VizieR/J/BaltA/12/301
Title:
Vilnius photometry in Barnard 1
Short Name:
J/BaltA/12/301
Date:
21 Oct 2021
Publisher:
CDS
Description:
Spectral and luminosity classes, absolute magnitudes. color excesses, interstellar extinctions and distances are determined for 98 stars down to 13mag in the Barnard 1 dark cloud belonging to the Per OB2 association. The classification of stars is based on their photoelectric photometry in the Vilnius seven-color photometric system. The extinction vs. distance diagram exhibits the presence of two dust layers at 150 and 230pc distances. The distance of the first cloud, which gives an extinction AV of 0.3mag, coincides with the distance of the Taurus dark cloud complex. The second cloud with much larger extinction is about at the same distance as the clouds in the direction of the nearby objects: reflection nebula NGC 1333 and open cluster IC 348.
16917. Vilnius photometry in Cam/Per
ID:
ivo://CDS.VizieR/J/BaltA/10/349
Title:
Vilnius photometry in Cam/Per
Short Name:
J/BaltA/10/349
Date:
21 Oct 2021
Publisher:
CDS
Description:
157 stars down to 11th mag in a 3{deg}x4{deg} area at l=149{deg}, b=-0.3{deg} have been measured in the Vilnius photometric system. Magnitudes V, color indices, spectral classes, absolute magnitudes, color excesses and distances of the stars are determined. The interstellar extinction in all the area appears at a distance of about 100pc, grows monotonically and at a distance of 500pc it reaches ~2mag in the area of the dark cloud L1391 and 0.7-1.7mag in the remaining area. At larger distances the extinction is affected by a selection effect.
16918. Vilnius photometry in Cam-Per border
ID:
ivo://CDS.VizieR/J/BaltA/11/75
Title:
Vilnius photometry in Cam-Per border
Short Name:
J/BaltA/11/75
Date:
21 Oct 2021
Publisher:
CDS
Description:
Seven-color photometry in the Vilnius system for 309 stars down to 12.5mag in the area along the galactic equator near the Camelopardalis and Perseus border is presented. Photometric spectral and luminosity classes of the stars are determined.
16919. Vilnius photometry in IC 59 and IC 63
ID:
ivo://CDS.VizieR/J/AJ/161/149
Title:
Vilnius photometry in IC 59 and IC 63
Short Name:
J/AJ/161/149
Date:
20 Jan 2022
Publisher:
CDS
Description:
Optical and infrared continuum polarization from the interstellar medium is driven by radiative processes aligning the grains with the magnetic field. While a quantitative, predictive theory of radiative alignment torques (RATs) exists and has been extensively tested, several parameters of the theory remain to be fully constrained. In a recent paper, Medan & Andersson showed that the polarization efficiency (and therefore grain alignment efficiency) at different locations in the wall of the Local Bubble (LB) could be modeled as proportional to the integrated light intensity from the surrounding stars and OB associations. Here we probe that relationship at high radiation field intensities by studying the extinction and polarization in the two reflection nebulae IC59 and IC63 in the Sh2-185 HII region, illuminated by the B0 IV star {gamma}Cassiopeia. We combine archival visual polarimetry with new seven-band photometry in the Vilnius system, to derive the polarization efficiency from the material. We find that the same linear relationship seen in the LB wall also applies to the Sh2-185 region, strengthening the conclusion from the earlier study.
16920. Vilnius photometry in LDN 935
ID:
ivo://CDS.VizieR/J/BaltA/15/483
Title:
Vilnius photometry in LDN 935
Short Name:
J/BaltA/15/483
Date:
21 Oct 2021
Publisher:
CDS
Description:
Magnitudes and color indices of 439 stars down to V~17.5mag in the eight-color Vilnius + I photometric system were obtained in four areas of diameters 20' within the dark cloud L935 separating the North America and Pelican nebulae. Spectral types, interstellar color excesses, extinctions and distances of stars were determined from the photometric data.

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