scholarly journals NGC 1893: a young open cluster rich in multitype variable stars

2018 ◽  
Vol 482 (1) ◽  
pp. 658-697
Author(s):  
Hui-Fang Xue ◽  
Jian-Ning Fu ◽  
Nami Mowlavi ◽  
Sophie Saesen ◽  
Fabio Barblan ◽  
...  
Keyword(s):  
Open Cluster ◽  
Variable Stars ◽  
Young Open Cluster

scholarly journals Photometric, kinematic, and variability study in the young open cluster NGC 1960

2020 ◽  
Vol 492 (3) ◽  
pp. 3602-3621 ◽  
Author(s):  
Y C Joshi ◽  
J Maurya ◽  
A A John ◽  
A Panchal ◽  
S Joshi ◽  
...  
Keyword(s):  
Open Cluster ◽  
Mass Range ◽  
Mass Function ◽  
Variable Stars ◽  
B Stars ◽  
V Band ◽  
Short Period ◽  
Young Open Cluster ◽  
Mass Segregation ◽  
Variability Study

ABSTRACT We present a comprehensive photometric analysis of a young open cluster NGC 1960 (= M36) along with the long-term variability study of this cluster. Based on the kinematic data of Gaia DR2, the membership probabilities of 3871 stars are ascertained in the cluster field among which 262 stars are found to be cluster members. Considering the kinematic and trigonometric measurements of the cluster members, we estimate a mean cluster parallax of 0.86 ± 0.05 mas and mean proper motions of μRA = −0.143 ± 0.008 mas yr−1 and μDec. = −3.395 ± 0.008 mas yr−1. We obtain basic parameters of the cluster such as E(B − V) = 0.24 ± 0.02 mag, log(Age/yr) = 7.44 ± 0.02, and d = 1.17 ± 0.06 kpc. The mass function slope in the cluster for the stars in the mass range of 0.72–7.32 M⊙ is found to be γ = −1.26 ± 0.19. We find that mass segregation is still taking place in the cluster which is yet to be dynamically relaxed. This work also presents first high-precision variability survey in the central 13 arcmin × 13 arcmin region of the cluster. The V-band photometric data accumulated on 43 nights over a period of more than 3 yr reveals 76 variable stars among which 72 are periodic variables. Among them, 59 are short period (P < 1 d) and 13 are long period (P > 1 d). The variable stars have V magnitudes ranging between 9.1 to 19.4 mag and periods between 41 min and 10.74 d. On the basis of their locations in the H–R diagram, periods, and characteristic light curves, 20 periodic variables belong to the cluster are classified as 2 δ-Scuti, 3 γ-Dor, 2 slowly pulsating B stars, 5 rotational variables, 2 non-pulsating B stars, and 6 as miscellaneous variables.

scholarly journals Pre-main-sequence variable stars in young open cluster NGC 1893

2012 ◽  
Vol 427 (2) ◽  
pp. 1449-1462 ◽  
Author(s):  
Sneh Lata ◽  
A. K. Pandey ◽  
W. P. Chen ◽  
G. Maheswar ◽  
Neelam Chauhan
Keyword(s):  
Main Sequence ◽  
Open Cluster ◽  
Variable Stars ◽  
Young Open Cluster

scholarly journals Search for variable stars in the young open cluster Stock 18

2017 ◽  
Vol 152 ◽  
pp. 01024
Author(s):  
Tirthendu Sinha ◽  
Saurabh Sharma ◽  
Rakesh Pandey ◽  
A.K. Pandey
Keyword(s):  
Open Cluster ◽  
Variable Stars ◽  
Young Open Cluster

scholarly journals Main-sequence variable stars in young open cluster NGC 1893

2014 ◽  
Vol 442 (1) ◽  
pp. 273-284 ◽  
Author(s):  
Sneh Lata ◽  
Ram Kesh Yadav ◽  
A. K. Pandey ◽  
Andrea Richichi ◽  
C. Eswaraiah ◽  
...  
Keyword(s):  
Main Sequence ◽  
Open Cluster ◽  
Variable Stars ◽  
Young Open Cluster

scholarly journals Variable stars in young open cluster NGC 2244

2019 ◽  
Vol 487 (3) ◽  
pp. 3505-3522 ◽  
Author(s):  
Gabriela Michalska
Keyword(s):  
Near Infrared ◽  
Open Cluster ◽  
Variable Stars ◽  
Eclipsing Binaries ◽  
Class I ◽  
Be Stars ◽  
Membership Probability ◽  
Young Open Cluster ◽  
Stellar Sources ◽  
Scuti Stars

ABSTRACT We present results of a UBVIC variability survey in the young open cluster NGC 2244. In total, we found 245 variable stars. Most of them, 211 stars, are variables with irregular variations. Furthermore, 23 periodic variables were found. We also detected four candidates for δ Scuti stars and seven eclipsing binaries. Based on the mid-infrared Spitzer and WISE photometry and near infrared JHKS 2MASS photometry, we classified 104 young stellar sources among our variables: 1 Class I object, 1 Class I/flat spectrum object, 4 flat spectrum objects, 91 Class II objects, and 7 transition disc objects. This classification, together with r′i′Hα IPHAS photometry and JHK UKIDSS photometry, were used for identification of pre-main sequence stars among irregular and periodic variables. In this way, 97 CTTS candidates (96 irregular and one periodic variable), 68 WTTS candidates (54 irregular and 14 periodic variables), and 6 Herbig Ae/Be stars were found. For 223 variable stars we calculated membership probability based on proper motions from Gaia DR2 catalogue. Majority of them, 143 stars, are cluster members with probability greater than 70 per cent. For only 36 variable stars the membership probability is smaller than 20 per cent.

scholarly journals Variable stars in the field of the young open cluster Roslund 2

2013 ◽  
Vol 9 (S301) ◽  
pp. 495-496
Author(s):  
P. Sowicka ◽  
G. Handler ◽  
R. Taubner ◽  
M. Brunner ◽  
V.-M. Passegger ◽  
...  
Keyword(s):  
Open Cluster ◽  
Variable Stars ◽  
Interstellar Cloud ◽  
Star Cluster ◽  
Open Clusters ◽  
Light Curves ◽  
Ccd Photometry ◽  
Open Star ◽  
Young Open Cluster ◽  
Open Star Cluster

AbstractThe study of variable stars in open clusters via asteroseismology is a powerful tool for the study of stellar evolution and stars in general. That is because stars in clusters can be assumed to originate from the same interstellar cloud, so they share similar properties such as age and overall metallicity. We performed a search for variable stars in the field of the young open star cluster Roslund 2, with photoelectric and CCD photometry acquired at two different telescopes. Within the resulting light curves we have found 12 variable stars. Our measurements confirm three previously known variables.

scholarly journals Stellar Content of the Young Open Cluster NGC 6823

2000 ◽  
Vol 176 ◽  
pp. 499-500
Author(s):  
A. Pigulski ◽  
Z. Kolaczkowski ◽  
G. Kopacki
Keyword(s):  
Main Sequence ◽  
Evolutionary Rate ◽  
Open Cluster ◽  
Variable Stars ◽  
Period Change ◽  
Stellar Content ◽  
Preliminary Results ◽  
The Future ◽  
Young Open Cluster

AbstractThe preliminary results of the CCD search for variable stars in the very young open cluster NGC 6823 are presented. About ten new variable stars were discovered. The most interesting finding is that of the two pre-main sequence (PMS) δ Scuti-type variables. Because the evolutionary rate of period change is large at the PMS stage, these stars could be used in the future for testing it observationally.

scholarly journals Frequency Analysis of β Cephei Stars in NGC 4755

2002 ◽  
Vol 185 ◽  
pp. 148-149
Author(s):  
A. Stankov
Keyword(s):  
Time Series ◽  
Frequency Analysis ◽  
Open Cluster ◽  
Variable Stars ◽  
Young Open Cluster

AbstractWe present the results of the multi-color, two-site observing campaign of β Cephei stars in the young open cluster NGC 4755, from 1999 and 2000. More than 200 hours of time-series photometric U, B, V filter data of the variable stars were acquired. We show a table of the detected frequencies and discuss the results.

scholarly journals CCD Photometry of Variable Stars in the Galactic Open Cluster NGC 7419

2002 ◽  
Vol 185 ◽  
pp. 150-151 ◽  
Author(s):  
Z. Kołaczkowski ◽  
A. Pigulski ◽  
G. Kopacki
Keyword(s):  
Time Scales ◽  
Open Cluster ◽  
Variable Stars ◽  
Be Stars ◽  
Ccd Photometry ◽  
Period Variability ◽  
Short Period ◽  
Young Open Cluster ◽  
Almost All ◽  
Different Time Scales

AbstractWe present results of a CCD variability search in the field of the young open cluster NGC 7419. This cluster contains a large number of Be stars and almost all of them turned out to be variable. They show mostly irregular variations on different time-scales with ranges up to 0.4 mag in the IC band. The most interesting result is the discovery of short-period variability in some of the Be stars.

scholarly journals Variable stars in the young open cluster NGC 2244

2013 ◽  
Vol 9 (S301) ◽  
pp. 453-454 ◽  
Author(s):  
Gabriela Michalska
Keyword(s):  
Open Cluster ◽  
Variable Stars ◽  
Pulsating Stars ◽  
Young Open Cluster

AbstractWe present results of a search for variable stars in the young open cluster NGC 2244. As a result we have found many eclipsing systems and pulsating stars, some of which are multiperiodic. Here we show only a few examples.

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