- ID:
- ivo://CDS.VizieR/J/AZh/78/1135
- Title:
- Spectrophotometric standards near DE=+40{deg}
- Short Name:
- J/AZh/78/1135
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The second stage to compile a list of regional intermediate-brightness spectrophotometric standards has been completed. It includes the spectral energy distribution for 24 stars with magnitudes 7.0-8.5 near +40{deg} declination. The range 3100-7600{AA} was studied with a spectral resolution of 50{AA}. All the stars are referenced to a single standard the circumpolar star HD 221525. The energy distributions were used to compute color indices in the UBV, WBVR, and UPXYZVS systems,as well as in the system (BT,VT) of the TYCHO catalog.
Number of results to display per page
Search Results
- ID:
- ivo://CDS.VizieR/J/BaltA/20/317
- Title:
- TGU 619 stars spectral types and distances
- Short Name:
- J/BaltA/20/317
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Interstellar extinction is investigated in a 1.5 square degree area of the Cepheus Flare in the direction of the dark cloud TGU 619 at l=102.5{deg}, b=+15.5{deg} . The study is based on photometric classification of 658 stars in spectral and luminosity classes down to V=16mag using photometry in the Vilnius seven-color system published in Paper I (2009BaltA..18..161Z, Cat. J/BaltA/18/161). The extinction in the investigated area is very uneven: in the most transparent directions we find an extinction of 0.3-1.1mag while in the darkest directions the maximum extinction observed is 2.6mag. The real extinction should be considerably larger since in the direction of some cloud clumps no stars are seen. The distribution of stars in the AV vs. d plot gives evidence that the dust clouds are located at a distance of 286+/-20pc.
- ID:
- ivo://CDS.VizieR/J/BaltA/18/161
- Title:
- TGU 619 Vilnius photometry
- Short Name:
- J/BaltA/18/161
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The catalog contains magnitudes and color indices of 1304 stars down to ~16.6mag in V measured in the seven-color Vilnius photometric system in the area of 1.5 square degrees with the center at Galactic coordinates 102.4{deg}, +15.5{deg}, containing the dark cloud TGU619 in the Cepheus Flare. For most of the stars spectral and luminosity classes determined from the photometric data are given.
- ID:
- ivo://CDS.VizieR/J/BaltA/20/1
- Title:
- Tombaugh 5 Vilnius photometry
- Short Name:
- J/BaltA/20/1
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- We present the results of eight-color CCD photometry of 674 stars in the direction of the open cluster Tombaugh 5 in Camelopardalis. The stars are observed in the Vilnius system supplemented by the broad-band I filter; the field is of 22' diameter, the limiting magnitude is V=17.7mag. The catalog contains the coordinates, V magnitudes, seven color indices, two-dimensional spectral types determined from photometric parameters, interstellar extinctions and distances. The color-magnitude diagram plotted for 480 individually dereddened stars is used to identify cluster members and to determine the distance (1.74kpc) and age (200-250Myr) of the cluster. The fain test cluster stars classified are of spectral class G0. The cluster contains two blue stragglers of spectral classes B2-B4, both of them seem to be visual binaries. The extinction AV for the cluster stars is non-uniform, being spread between 2 and 3mag, with a mean value of 2.42mag. The extinction vs. distance dependence can be modeled by the Parenago exponential curve with two dust concentrations in the Camelopardalis dark clouds at about 150pc and the Cam OB1 association clouds at 0.9-1.0kpc.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
