Multicolor CCD Photometry of the Open Cluster IC 361

2010 ◽  
Vol 19 (1-2) ◽  
Author(s):  
J. Zdanavičius ◽  
S. Bartašiūtė ◽  
R. P. Boyle ◽  
F. J. Vrba ◽  
K. Zdanavičius
Keyword(s):  
Open Cluster ◽  
Interstellar Extinction ◽  
Ccd Photometry ◽  
Color Indices ◽  
Absolute Magnitudes

AbstractCCD photometry in the eight-color Vilnius + I system for 7250 stars down to I =19.6 mag has been obtained in the 20′ × 26′ field of the open cluster IC 361 in Camelopardalis. The catalog of 1420 stars down to V ~ 18.5 mag is presented. It contains the coordinates, V magnitudes and seven color indices, quantitative photometric spectral types, absolute magnitudes and distances. The interstellar extinction is found to be non-uniform across the field, with the values of A

Vilnius Multicolor CCD Photometry of the Open Cluster NGC 752

2011 ◽  
Vol 20 (1) ◽  
Author(s):  
S. Bartašiūtė ◽  
R. Janusz ◽  
R. P. Boyle ◽  
A. G. Davis Philip
Keyword(s):  
Open Cluster ◽  
Central Area ◽  
Ccd Camera ◽  
Advanced Technology ◽  
Ccd Photometry ◽  
Intermediate Band ◽  
Color Indices ◽  
Ccd Observations ◽  
Low Mass ◽  
Absolute Magnitudes

AbstractWe have performed multicolor CCD observations of the central area of NGC 752 to search for faint, low-mass members of this open cluster. Four 12’ x 12’ fields were taken on the 1.8 m Vatican Advanced Technology Telescope (Mt. Graham, Arizona) using a 4K CCD camera and eight intermediate-band filters of the Strömvil (Strömgren + Vilnius) system. In this paper we present a catalog of photometry for 405 stars down to the limiting magnitude V = 18.5, which contains V magnitudes and color indices of the Vilnius system, together with photometric determinations of spectral types, absolute magnitudes M

scholarly journals IC 361, a distant intermediate-age cluster in Camelopardalis

2009 ◽  
Vol 5 (S266) ◽  
pp. 557-560
Author(s):  
Justas Zdanavičius ◽  
Richard P. Boyle ◽  
Frederick J. Vrba ◽  
Kazimieras Zdanavičius ◽  
Stanislava Bartašiūtė
Keyword(s):  
Open Cluster ◽  
Interstellar Extinction ◽  
Distance Modulus ◽  
Ccd Photometry ◽  
True Distance ◽  
Individual Stars ◽  
Cluster Distance ◽  
Spiral Arm

AbstractWe have undertaken CCD photometry in the eight-color Vilnius + I system for the open cluster IC 361 (l = 147.5°, b = 5.7°) located in the constellation of Camelopardalis. Based on multicolor data, estimates of distance moduli, foreground reddening and metallicity have been obtained for individual stars measured in the field of the cluster. This allowed us to eliminate most of the field stars and to identify the probable cluster members, from which we derived the true distance modulus (m − M)0 = 12.7 mag and metallicity [Fe/H] = −0.3 dex. The interstellar extinction is found to be nonuniform across the field, with values of AV ranging from 1.9 to 2.6 mag. A comparison of the color–magnitude diagrams with Padova isochrones yields (m − M)0 = 12.6 mag, or a cluster distance of 3.3 kpc, and an age of 1.0 Gyr. Therefore, IC 361 appears to be a mildly metal-deficient cluster of intermediate age, located as far as, or just beyond, the Perseus spiral arm.

Interstellar Extinction in the Direction of The Barnard 1 Dark Cloud in Perseus

2003 ◽  
Vol 12 (3) ◽  
Author(s):  
K. Černis ◽  
V. Straižys
Keyword(s):  
Open Cluster ◽  
Interstellar Extinction ◽  
Photometric System ◽  
Dark Cloud ◽  
Photoelectric Photometry ◽  
Reflection Nebula ◽  
Absolute Magnitudes ◽  
Cloud Complex

AbstractSpectral and luminosity classes, absolute magnitudes, color excesses, interstellar extinctions and distances are determined for 98 stars down to 18 mag 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 230 pc distances. The distance of the first cloud, which gives an extinction Ay of 0.3 mag, 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 IG 348.

CCD Photometry of the Open Cluster Tombaugh 5 in the Vilnius System

2011 ◽  
Vol 20 (1) ◽  
pp. 1-25 ◽  
Author(s):  
J. Zdanavičius ◽  
F. J. Vrba ◽  
K. Zdanavičius ◽  
V. Straižys ◽  
R. P. Boyle
Keyword(s):  
Open Cluster ◽  
Broad Band ◽  
Two Dimensional ◽  
Ccd Photometry ◽  
Blue Stragglers ◽  
Spectral Class ◽  
Color Indices ◽  
Magnitude Diagram ◽  
Visual Binaries

AbstractWe 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 =17.7 mag. 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 (1.74 kpc) and age (200-250 Myr) of the cluster. The faintest 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 A

scholarly journals The Absolute Magnitude of the Early-Type MK Standards From Hipparcos Parallaxes

1998 ◽  
Vol 11 (1) ◽  
pp. 566-566
Author(s):  
C. Jaschek ◽  
A.E. Gómez
Keyword(s):  
Main Sequence ◽  
Rotational Velocity ◽  
Wide Band ◽  
Absolute Magnitude ◽  
Interstellar Extinction ◽  
Early Type ◽  
Class V ◽  
Luminosity Class ◽  
The Absolute ◽  
Absolute Magnitudes

We have analysed the standards of the MK system in the B0-F5 spectral region with the help of Hipparcos parallaxes, using only stars for which the error on the absolute magnitude is ≤ 0.3 mag. The sample stars (about one hundred) were scrutinized for companions and for interstellar extinction. We find that the main sequence is a wide band and that, although in general giants and dwarfs have different absolute magnitudes, the separation between luminosity class V and III is not clear. We conclude that there is no strict relation between luminosity class and absolute magnitude. The relation is only a statistical one and has a large intrinsic dispersion. We have analysed similarly the system of standards defined by Garrison and Gray (1994) separating low and high rotational velocity standards. We find similar effects as in the original MK system.

Flatfielding Errors in Strömvil CCD Photometry

2003 ◽  
Vol 12 (4) ◽  
Author(s):  
R. P. Boyle ◽  
R. Janusz ◽  
A. G. Davis Philip ◽  
A. Kazlauskas ◽  
V. Laugalys
Keyword(s):  
Open Cluster ◽  
Ccd Photometry ◽  
Flat Field

AbstractThe importance of determining the error of the flat field in CCD photometry is detailed and our methods of doing this are described. We now have reached a precision of 1-1.5 % in our photometry. Color-magnitude diagrams of the open cluster M67 (ours and Laugalys et al. 2003) are compared.

CCD photometry of stars in the old open cluster NGC 188

1990 ◽  
Vol 99 ◽  
pp. 261 ◽  
Author(s):  
F. Caputo ◽  
A. Chieffi ◽  
V. Castellani ◽  
M. Collados ◽  
C. Martinez Roger ◽  
...  
Keyword(s):  
Open Cluster ◽  
Ccd Photometry
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