2012AJ....144...86Z


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET14:36:21

2012AJ....144...86Z - Astron. J., 144, 86 (2012/September-0)

B-type variables in the young open cluster NGC 457.

ZHANG X.B., LUO C.Q. and FU J.N.

Abstract (from CDS):

We have performed long-term, two-color time-series CCD photometry of the young open cluster NGC 457 to search for B-type variables. The light variations of about 400 stars located in a 16'.5x16'.5 field of the cluster were examined. It resulted in the detection of 13 periodic variables, including 8 B-type variables. With the two-color photometric data, we have constructed a color-magnitude diagram for the cluster. A brief isochrone fitting yields a reddening of E(B - V) = 0.46±0.05 and a distance modulus of (m - M)_ V_= 13.30±0.10 with an age of log(Age) = 7.30. With the above results, we identified three probable member stars in addition to six certain ones from the new variable sample. Through a preliminary photometric analysis with the obtained B- and V-band light curves, we have determined the amplitude and period of light variations for each of the variables. Based on this, the physical properties and classification of the detected variables are discussed. As a conclusion, we have identified one β Cep, five candidate SPB stars, and three δ Scuti-type pulsating stars plus three EA-type eclipsing binaries and one EW-type one in NGC 457.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - open clusters and associations: individual: NGC 457 - stars: early-type - stars: oscillations - stars: variables: general

Nomenclature: Fig. 1, Table 2: [ZLF2012] vNN (Nos v1-v13).

Simbad objects: 18

goto Full paper

goto View the reference in ADS

Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* V1077 Cas EB* 01 17 49.8 +58 24 31   15.88 14.80     ~ 2 0
2 V* V1078 Cas dS* 01 17 51.4 +58 15 24   16.14 15.45     ~ 2 0
3 V* V1084 Cas Al* 01 18 49.1926567579 +58 23 53.437339625 14.81 14.31 13.55     ~ 4 0
4 NGC 457 264 * 01 18 53.9716251572 +58 28 16.614775388     12.91     ~ 3 0
5 NGC 457 124 Be* 01 19 02.3622542188 +58 19 20.247538535 12.08 12.23 11.95     B3Ve 10 0
6 BD+57 246 Em* 01 19 08.5744626399 +58 14 15.461454668 9.45 9.97 9.72     B6V:e 31 0
7 V* V765 Cas bL* 01 19 09.0530473776 +58 17 26.026264219 10.88 11.06 10.78     ~ 28 0
8 NGC 457 91 Em* 01 19 14.4646749381 +58 13 33.101434670 11.1 11.62 11.30     ~ 11 0
9 BD+57 249 * 01 19 23.0177949812 +58 18 20.251144597 9.83 10.12 9.83     B1V 25 0
10 Cl* NGC 457 ESY 33 * 01 19 23.1156125915 +58 16 00.789743029     14.6     ~ 2 0
11 NGC 457 8 * 01 19 28.2708196952 +58 17 17.760874908   10.27 10.02     ~ 3 0
12 BD+57 251 ** 01 19 31.2520 +58 15 49.785   10.379 10.198     B3 19 0
13 NGC 457 OpC 01 19 35 +58 17.2   6.97 6.4     ~ 217 2
14 NGC 457 52 * 01 19 36.8095755764 +58 15 02.574420338   12.36 12.3     ~ 5 0
15 * phi Cas s*y 01 20 04.9146181556 +58 13 53.812633124 6.15 5.66 4.98 4.34 3.78 F0Ia 256 0
16 * del Sct dS* 18 42 16.4270465894 -09 03 09.200429056   5.04 4.71     F2II-III 451 0
17 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 687 0
18 NAME Cas Region reg ~ ~           ~ 29 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2012AJ....144...86Z and select 'bookmark this link' or equivalent in the popup menu


2020.12.02-14:36:21

© Université de Strasbourg/CNRS

    • Contact