Basic parameters of open star clusters DOLIDZE 14 and NGC 110 in infrared bands

Abstract

The basic physical parameters of a poorly studied open cluster NGC 110 and an unstudied open cluster DOLIDZE 14 are estimated in the present study using the archival P P MXL and W ISE catalogues. The radius of both the clusters are estimated by fitting the modified King's empirical model on their stellar density profiles. The other basic parameters of the clusters such as distance, reddening, and age are obtained by visual fitting of the Marigo's solar metallicity isochrone on their IR colour-magnitude diagrams (CMDs). The mean-proper motion of the clusters are estimated through the individual proper motion of probable members identified through the dynamical and statistical methods. The archival catalogues (JHKW 1 W 2 ) are constructed for both the clusters by compiling the extracted data from the P P MXL and W ISE catalogues. The various colour-excesses, such as E(J −H), E(H −K) and E(W 1 − W 2 ), are estimated using the best fit theoretical isochrone on the (J − H) − H, (H − K) − H and (W 1 − W 2 ) − H CMDs, respectively. The ratios of various infrared colours of the clusters are obtained through their two-colour diagrams. We also identify the most probable members in these clusters by estimating spatial, kinematic and spatio-kinematic probabilities of stars within the cluster. A correlation between the E(H −K) and E(W 1 −W 2 ) is also established.

Photometric Search for variable stars in the field of two Northern open clusters, DOLIDGE 14 and NGC 1960

“…In the database of WEBDA, the center coordinates, (α, δ) J2000 , of DOLIDZE 14 is (04 h : 06 m : 36.0 s , +27 o : 26 ′ : 00.0 " ) as per work of Alter et al(1970) [16]. [17] have been studied the nature of stellar enhancement around the celestial coordinates, (04 h : 06 m : 36.0 s , +27 o : 26 ′ : 00.0 " ) J2000 and they shown results as per infrared photometric analysis of stars within DOLIDZE 14. This cluster has shown stellar enhancement in the B-band of USNB1.0, whereas it does not show any stellar enhancement in the infra-red bands [18].…”

“…[17] have been studied the nature of stellar enhancement around the celestial coordinates, (04 h : 06 m : 36.0 s , +27 o : 26 ′ : 00.0 " ) J2000 and they shown results as per infrared photometric analysis of stars within DOLIDZE 14. This cluster has shown stellar enhancement in the B-band of USNB1.0, whereas it does not show any stellar enhancement in the infra-red bands [18]. In this connection, they have been estimated the values of (α, δ))J2000 and (µ x , µ y ) as (04 h : 06 m : 26.7 s , +27 o : 22 ′ : 26.7 " ) and (−0.15±0.34 mas/yr, −7.79±0.41 mas/yr ), respectively.…”

“…The red dots of lower panels of Figure 17 represent identified variable stars within the core region of DOLIDZE 14. The distance modulus and distance for cluster DOLIDZE 14 have been estimated by [17] as 11.12±0.18 mag and 1.67±0.14 kpc respectively. In this connection, the best fitted isochrone is depicted by black solid line in Figure 17, whereas pink and blue lines represent lower and upper limits for apparent distance modulus.…”

“…In this connection, they have been estimated the values of (α, δ))J2000 and (µ x , µ y ) as (04 h : 06 m : 26.7 s , +27 o : 22 ′ : 26.7 " ) and (−0.15±0.34 mas/yr, −7.79±0.41 mas/yr ), respectively. Joshi et al ( 2015) [17] estimated the values of radius, reddening and distance as 9.6±0.2 arcmin, 0.32±0.02 mag and 1.67±0.14 kpc respectively. It is a suitable for analysis of deep CCD-photometic observations due to the system of fainter stars and it is also non-standardized in optical photometry.…”