2011A&A...525A..16P


Query : 2011A&A...525A..16P

2011A&A...525A..16P - Astronomy and Astrophysics, volume 525A, 16-16 (2011/1-1)

A photometric long-term study of chemically peculiar stars in open clusters.

PAUNZEN E., HENSBERGE H., MAITZEN H.M., NETOPIL M., TRIGILIO C., FOSSATI L., HEITER U. and PRANKA M.

Abstract (from CDS):

Photometric variability of chemically peculiar (CP) stars of the upper main sequence is closely connected to their local stellar magnetic field and their rotational period. Long term investigations, as presented here, help us to identify possible stellar cycles (as in the Sun). Furthermore, these data provide a basis for detailed surface mapping techniques. Photoelectric Stroemgren uvby time series for 27 CP stars within the boundaries of open clusters are presented. In addition, Hipparcos photometric data (from 1989 to 1993) are used for our analysis. Our observations cover a time period of about six years (1986 to 1992) with typically fifteen measurements for each objects. These observations help us to determine the rotational periods of these objects. A standard reduction procedure was applied to the data. When possible, we merged our data sets with already published ones to obtain a more significant result. A detailed time series analysis was performed, involving five different methods to minimize spurious detections. We established, for the first time, variability for fourteen CP stars. For additional two stars, a merging of already published data sets, resulted in more precise periods, whereas for six objects, the published periods could be confirmed. Last, but not least, no significant variations were found for five stars. Apart from six stars, all targets seem to be members of their host open clusters. The present observations fill an important gap in previous photometric long-time studies of CP stars. The presented open cluster members are excellent targets for follow-up observations, employing for example polarimetric, high-resolution spectroscopic, and surface mapping techniques.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - open clusters and associations: general - stars: variables: general

VizieR on-line data: <Available at CDS (J/A+A/525/A16): stars.dat lc/*>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 63

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Number of rows : 63
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* V1137 Tau a2* 04 12 51.2508054048 +22 24 48.482221392 6.04 6.31 6.12     B8III 109 0
2 Cl Collinder 132 OpC 07 13 56.4 -30 45 29     3.6     ~ 66 0
3 HD 56046 * 07 14 02.6604794640 -31 38 33.365947596   7.55 7.64     B6V 19 0
4 HD 56162 ** 07 14 34.90552 -31 29 36.4860   7.87 7.80     A1V 15 0
5 HD 56343 * 07 15 18.6617152176 -31 54 34.836209208   9.17 9.17     B9V 27 0
6 V* V607 Car a2* 07 56 22.6795854768 -61 17 02.136961464   9.365 9.340     ApSi 46 0
7 CPD-60 944A a2* 07 56 45.1050993480 -60 48 54.285743628   8.345 8.370     B8pSi 49 0
8 CD-60 1931 Pu* 07 56 54.6806295288 -60 35 54.497068332 7.72 8.04 8.09     B7 48 0
9 CD-60 1936 * 07 57 19.8110014152 -60 48 46.298213784   9.49 9.30     B9V 39 0
10 NGC 2516 OpC 07 58 06.5 -60 48 00           ~ 722 0
11 V* V422 Car a2* 07 59 21.2942838672 -60 48 56.393118468   9.13 9.08     B8/9pSi 77 0
12 HD 87137 * 10 01 03.9132746904 -60 19 34.857976944   8.27 8.29     B8IV 24 0
13 HD 87240 * 10 01 44.0901709680 -59 51 00.176879232   9.69 9.91     ApSi 42 0
14 NGC 3114 OpC 10 02 12.7 -60 02 28   4.47 4.2     ~ 197 0
15 HD 304841 * 10 02 22.0499144976 -59 59 57.755460768   10.02 10.15     A 18 0
16 HD 87349 * 10 02 31.8839576664 -59 53 07.728850104   8.59 8.62     B8V 25 0
17 V* V424 Car a2* 10 02 39.8186174520 -59 57 54.678266820   9.74 9.86     B7/8 39 1
18 HD 87405 * 10 02 48.1967097432 -59 57 30.179331720   8.41 8.50     ApSi 46 0
19 HD 87752 * 10 05 07.7818386096 -60 13 59.793437280   9.83 9.83     B8/9II 36 0
20 HD 89856 Pu* 10 20 55.3175795040 -51 51 41.692159836   8.97 9.04     B9 29 0
21 HD 89900 ** 10 21 13.8324933527 -51 42 52.493701192           A0/1IV/V 20 0
22 HD 89915 * 10 21 19.8788876520 -51 44 28.767990228   7.80 7.81     B9/A0V 22 0
23 NGC 3228 OpC 10 21 30.7 -51 48 50           ~ 85 0
24 HD 298053 * 10 21 48.2714595936 -51 50 10.085270676   10.88 10.63     A0 24 0
25 HD 96011 * 11 03 33.2049781944 -58 33 34.351783344   9.066 9.019 8.979 8.966 A0IV/V 33 0
26 HD 96040 * 11 03 48.8078723448 -58 34 36.736006944   9.990 9.971 9.920 9.886 B9IIIpSi 26 0
27 HD 96226 * 11 04 54.1823702232 -58 33 07.004231424   7.874 7.992 8.023 8.068 B8 26 0
28 NGC 3532 OpC 11 05 40.1 -58 42 25           ~ 358 0
29 HD 96729 * 11 07 34.9976095632 -58 40 47.240499468   9.934 9.947 9.910 9.900 B9 30 0
30 * alf02 CVn a2* 12 56 01.6655889007 +38 19 06.155170512 2.44 2.76 2.88 2.98 3.05 A0VpSiEu 684 0
31 HD 122983 Ro* 14 06 13.7010707688 -48 23 12.684451920 9.770 9.91 9.79     B9/A0IV/V 29 0
32 NGC 5460 OpC 14 07 23.3 -48 17 06   5.85 5.6     ~ 99 0
33 HD 123202 Pe* 14 07 31.5633956304 -48 27 57.149161236 8.745 8.83 8.83     B9IV/V 17 0
34 HD 123225 SB* 14 07 35.3007863448 -48 19 48.404569440 8.532 8.854 8.873   9.18 B9 39 0
35 HD 123224 * 14 07 37.8749348448 -48 11 09.667823280 7.784 7.98 7.98     B8/9II 36 0
36 NGC 5662 OpC 14 34 56.2 -56 38 24   6.18 5.5     ~ 123 0
37 HD 127817 * 14 35 26.2994019576 -56 37 17.199022188 9.08 9.34 9.14 9.03 8.81 B7/9II/III 17 0
38 CPD-56 6330 * 14 35 27.7996799208 -56 36 40.989005208 10.71 10.86 10.60 10.44 10.19 ~ 22 0
39 HD 127835 * 14 35 31.0192244856 -56 28 22.749961836   9.47 9.41     B7/9V 16 0
40 CPD-56 6334 * 14 35 32.6527447075 -56 33 55.288913536 9.99 10.12 9.88 9.66 -0.17 B8V 12 0
41 HD 127924 Pu* 14 36 01.5321812208 -56 27 36.560415564 8.98 9.27 9.23     B7/9III/IV 38 0
42 V* V974 Sco a2* 17 04 09.3337301904 -37 46 02.876867544   8.92 8.93     ApSi 35 0
43 V* V948 Sco a2* 17 04 15.6335213064 -38 03 06.311027016   9.47 9.54     B9IVpSiSrCrEu 40 0
44 NGC 6281 OpC 17 04 43.0 -37 56 53           ~ 138 0
45 CD-37 11237 ** 17 04 48.3283052658 -37 57 24.486519937       9.40   A2 10 0
46 CD-37 11241 * 17 04 48.6826258416 -38 06 26.252419716   8.45 8.37     B9 24 0
47 V* V970 Sco a2* 17 39 41.2405860216 -32 17 57.527626920   9.38 9.34     ~ 67 0
48 V* V971 Sco a2* 17 40 12.6408982440 -32 09 32.843045556   9.88 9.81     ~ 35 0
49 NGC 6405 OpC 17 40 16.6 -32 14 31           ~ 205 0
50 HD 160260 * 17 40 21.5928902664 -32 15 50.392111284   8.41 8.36     B6V 21 0
51 CD-32 13119 * 17 40 25.1293089528 -32 06 11.135934288   11.18 10.94     ~ 22 0
52 HD 160335 * 17 40 43.3547446440 -32 09 20.388889620   7.21 7.24     B3/5V 34 0
53 HD 162305 * 17 51 52.8802756344 -34 46 56.811887580   7.76 7.77     B8/9III/IV 45 0
54 HD 320764 ** 17 52 09.8992540872 -34 53 40.323689880   9.38 9.38 9.55   ~ 39 1
55 HD 162515 SB* 17 52 55.7709053280 -35 01 08.012539056   6.57 6.57     B9III 76 0
56 NGC 6475 OpC 17 53 47.3 -34 50 28           ~ 387 0
57 HD 170682 Be* 18 31 24.2109018096 -19 09 31.025696112 8.06 8.20 7.95     B5II/III 55 0
58 HD 170719 * 18 31 37.5565765440 -19 05 18.934840788 8.18 8.34 8.12     B5/7III 34 0
59 CPD-19 6897 SB* 18 31 44.5599164880 -19 07 13.582426260 10.5 10.59 10.18     ~ 38 0
60 IC 4725 OpC 18 31 44.9 -19 06 50           ~ 223 0
61 HD 170836 Ro* 18 32 12.2960813736 -19 16 32.636206308 9.03 9.26 8.95     B8II 42 0
62 HD 170820 SB* 18 32 13.1080081656 -19 07 26.333290848   8.89 7.36     G9IICN1Hdel1 84 0
63 HD 170860 Ro* 18 32 27.0187530912 -19 05 55.575351276   9.76 9.63     B9IV/V 40 0

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