2007AJ....134.2067R

Query : 2007AJ....134.2067R

2007AJ....134.2067R - Astron. J., 134, 2067-2078 (2007/November-0)

A search for low-amplitude variability in six open clusters using the robust median statistic.

ROSE M.B. and HINTZ E.G.

Abstract (from CDS):

We used point-spread function fitting and a differential ensemble determined from a robust median statistic (RoMS) to examine stars in six open clusters in a search for δ Scuti variables. In the search for new variable stars among hundreds or thousands of stars, the RoMS is proved more effective for finding low-amplitude variables than the traditional error-curve approach. This high-precision differential approach was applied to the open clusters NGC 225, NGC 559, NGC 6811, NGC 6940, NGC 7142, and NGC 7160. Thirteen variables, 29 suspected variables, and 65 potential variables were found, and time-series data of the variables are presented. Among the 13 variables we found nine new δ Scuti variables.

Abstract Copyright: ∼

Journal keyword(s): Stars: Variables: δ Scuti - open clusters and associations: individual (NGC 225) - open clusters and associations: individual (NGC 559) - open clusters and associations: individual (NGC 6811) - Galaxy: Open Clusters and Associations: Individual: NGC Number: NGC 6940 - open clusters and associations: individual (NGC 7142) - open clusters and associations: individual (NGC 7160) - Stars: Variables: Other

Nomenclature: Table 4: Cl* NGC 225 RH NNN N=21 among (Nos 6-111). Table 5: Cl* NGC 559 RH NNN N=18 among (Nos 38-353). Table 6: Cl* NGC 6811 RH NNN N=17 among (Nos 8-113). Table 7: Cl* NGC 6940 RH NNN N=16 among (Nos 10-262). Table 8: Cl* NGC 7142 RH NNN N=20 among (Nos 1-320). Table 9: Cl* NGC 7160 RH NNN N=16 among (Nos 13-134).

Status at CDS : Objects in title, abstract, text, figures, and all or part of small table(s) being processed in SIMBAD.

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 EM* LkHA 200 Or* 00 42 29.3697933600 +61 55 46.645570344   15.13 13.87 13.39   K3Ve 24 0
2 NGC 225 OpC 00 42 34.7 +61 47 30   7.43 7.0     ~ 110 0
3 BD+61 154 Ae* 00 43 18.2566590360 +61 54 40.139212716 10.83 11.13 10.60     B8eq 217 1
4 V* V383 Cas LP? 00 43 43.5004229472 +62 00 08.642990808           ~ 9 0
5 NGC 559 OpC 01 29 33.2 +63 18 02   9.85 9.5     ~ 81 0
6 * del Sct dS* 18 42 16.4268984096 -09 03 09.188922060   5.04 4.71     F2II-III 507 0
7 NGC 6811 OpC 19 37 21.8 +46 22 43   7.47 6.8     ~ 435 0
8 NGC 6882 OpC 20 11.8 +26 49     14.1     ~ 78 0
9 NGC 6885 OpC 20 12 01 +26 28.7   8.71 8.1     ~ 62 0
10 NGC 6940 OpC 20 34 28.4 +28 17 07           ~ 215 0
11 V* V375 Cep EB* 21 44 54.7497002952 +65 43 55.291970820   16.882 16.115   15.035 ~ 21 0
12 NGC 7142 OpC 21 45 10.2 +65 47 05   10.36 9.3     ~ 157 0
13 V* V582 Cep LP* 21 45 28.3511702208 +66 00 16.618819824           ~ 6 0
14 V* V497 Cep El* 21 53 26.5461900984 +62 35 13.154096904   9.16 8.98     B3V+B5V 47 0
15 NGC 7160 OpC 21 53 44.8 +62 35 33   6.34 6.1     ~ 243 0
16 HD 208392 Be* 21 53 48.1028849616 +62 36 51.923017728 6.74 7.20 7.03     B1Vn 165 0

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