2017PASP..129j4203P

Query : 2017PASP..129j4203P

2017PASP..129j4203P - Publ. Astron. Soc. Pac., 129, part no 10, 4203-104203 (2017/October-0)

On the photometric variability of very sharp-lined cool mCP stars.

PYPER D.M. and ADELMAN S.J.

Abstract (from CDS):

We investigate the photometric variability of very sharp-lined cool mCP stars from a list published in 1970 by Dr. George W. Preston who suggested that some belonged to the long-period tail of the period distribution. In this study, we discuss our Stromgren uvby observations obtained with the Four College Automated Photometric Telescope (FCAPT) at the Fairborn Observatory for 22 of the stars in Preston's list. We improved the periods of 11 stars. Further, we discuss results from the literature concerning the light, magnetic, and spectrum variability of these stars. Eleven of the stars are found to have periods longer than 20 days, and all but one of these stars display variations in the u and v filters that cannot be explained by the simple oblique rotator theory. We discuss some possible causes of this behavior.

Abstract Copyright: © 2017. The Astronomical Society of the Pacific. All rights reserved.

Journal keyword(s):

Simbad objects: 50

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Number of rows : 50
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 V* GR And a2* 00 28 28.5694460472 +32 26 15.875756412   6.99 6.91     A5VpSiSrCr 151 0
2 HD 2866 * 00 32 14.0522840760 +34 59 37.980447756   6.891 6.719     A5IV 16 0
3 HD 2924 * 00 32 34.5646631568 +27 34 50.721986532 6.870 6.770 6.700     A2IV 41 0
4 HD 5380 * 00 56 29.9954050224 +57 17 11.305852332   7.65 7.64     A0 18 0
5 V* V551 Cas a2* 01 00 33.4346947944 +60 26 40.930591668   8.68 8.5     B8 106 0
6 HD 8209 * 01 22 12.5873250936 +43 35 02.804669448   6.543 6.676     B5 29 0
7 V* HN And a2* 01 24 18.6765786624 +43 08 31.629475248   6.704 6.676     A4VpSrSi 153 0
8 HD 8671 PM* 01 26 18.6862929120 +43 27 27.869935680   6.464 5.978     F7V 84 0
9 HD 8862 * 01 28 12.3767131920 +44 02 57.278104944   6.57 6.64     ~ 21 0
10 V* GY And a2* 01 38 31.8255225672 +45 23 58.935650100   6.343 6.380     A2:VpSiSrCrEu 270 0
11 HD 11031 ** 01 49 15.54296 +47 53 48.9227           A3V 69 0
12 HD 12288 a2* 02 03 30.5070540192 +69 34 56.268492384   7.83 7.74     A0pCrSi 109 0
13 HD 12313 * 02 03 44.9066386296 +68 56 43.719489528   8.11 7.93     A5 9 0
14 HD 13320 * 02 13 20.7336377088 +69 22 02.045892360   8.33 8.16     A0 11 0
15 HD 18078 a2* 02 56 32.0098959576 +56 10 41.434633848   8.50 8.27     A0pSrCr 96 0
16 * 56 Ari a2* 03 12 14.2461137352 +27 15 25.085668788 5.22 5.64 5.76     B6IV-V 271 0
17 * 9 Tau a2* 03 36 58.0258965288 +23 12 39.846279780 6.960 6.840 6.730     A2p 110 0
18 HD 22578 * 03 38 40.7208105672 +22 39 34.600390848   6.685 6.702     A0 65 0
19 HD 22614 PM* 03 39 06.7235985096 +24 42 10.326988836   7.13 7.09     A0 68 0
20 V* DO Eri a2* 03 55 16.1313315312 -12 05 56.727712752 6.35 6.32 6.00     A9VpSrEuCr 411 0
21 V* KU Hya a2* 09 22 50.8563427 -09 50 19.659199 6.86 6.75 6.53     ApEuCrSr 176 0
22 HD 89069 a2* 10 21 16.0361505960 +78 45 51.457200984   8.46 8.42     A0p 57 0
23 V* AX CVn a2* 12 39 16.8606994152 +35 57 07.050433068   6.466 6.385     A0pSrCrEuKsn 181 0
24 V* HH Com a2* 13 18 37.2495284424 +26 21 56.748367008   8.08 7.83     A2p 118 0
25 HD 116233 PM* 13 21 59.8183590576 +24 52 56.348779584   7.315 7.073     A9III 28 0
26 HD 116706 * 13 25 06.6781079208 +23 51 15.912465444   5.829 5.745     A3IV 77 0
27 V* CU Vir a2* 14 12 15.8055434051 +02 24 33.945178515 4.46 4.90 5.02 5.10 5.23 ApSi 411 0
28 V* FF Vir a2* 14 25 55.8786309720 +00 59 33.756435456 7.07 7.09 7.07     ApEuSrCr 184 0
29 * chi Boo PM* 15 14 29.1587474040 +29 09 51.466943700   5.326 5.272     A1Va+ 94 0
30 * 50 Boo PM* 15 21 48.5751139296 +32 56 01.298173056   5.312 5.372     B9Vn 83 0
31 * bet CrB a2* 15 27 49.7540595700 +29 06 20.494640434 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 703 0
32 * 33 Lib a2* 15 29 34.7424021408 -17 26 27.377921220 7.22 7.07 6.69     F0VspEuGdSr 260 0
33 * 10 Aql a2* 18 58 46.9240671288 +13 54 23.941711692 6.23 6.14 5.89     A7VpSrEu_Ksn 292 0
34 V* V3961 Sgr a2* 19 51 50.6106718344 -39 52 27.738309468 5.05 5.27 5.33     ApCr(Si) 191 0
35 V* V1291 Aql a2* 19 53 18.7357174440 -03 06 52.063556976   5.837 5.619     F0VpSrCrEu 285 0
36 HD 191634 * 20 04 53.2346512296 +72 46 57.068002452   7.55 7.54     A0 12 0
37 HD 191742 a2* 20 09 47.0414403552 +42 32 28.814787780   8.36 8.16     A7p 79 0
38 V* V1372 Cyg a2* 20 13 36.3254054976 +53 39 33.549009120   7.334 7.333     A4p 133 0
39 * 73 Dra a2* 20 31 30.4066960752 +74 57 16.653861468   5.271 5.185     A9:VpCrSrEu 267 1
40 HD 199492 * 20 51 50.2135390128 +74 38 20.696022852   7.41 7.25     A3n 18 0
41 * gam Equ a2* 21 10 20.5000721160 +10 07 53.691967776 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 564 0
42 * 6 Equ * 21 10 31.3160417376 +10 02 56.088181608   6.090 6.057     A2Va 43 0
43 * bet Equ PM* 21 22 53.6134419432 +06 48 40.103417448   5.208 5.148     A3V 56 0
44 HD 204411 a2* 21 26 51.6219389280 +48 50 06.599806584 5.54 5.38 5.31     A4VpSiCrHg 190 0
45 V* MX Cep a2* 22 52 41.9147401560 +58 48 23.262786000   7.98 7.88     A2p 96 0
46 HD 216912 * 22 56 03.3747932160 +58 11 45.048220836 6.56 6.981 7.069     A0 25 0
47 HD 217860 dS* 23 02 37.3824840864 +59 36 18.215544312   7.61 7.29     A5 15 0
48 HD 220999 * 23 27 54.2597001384 +59 41 43.071848556   7.80 7.57     A1 23 0
49 V* V436 Cas a2* 23 32 47.6484957000 +57 54 20.112470496   7.72 7.55     A0p 122 0
50 HD 222514 * 23 41 00.7986304032 +57 50 19.399636176   7.406 7.207     kA2mF0 32 0

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