2015MNRAS.452.3334S

Query : 2015MNRAS.452.3334S

2015MNRAS.452.3334S - Mon. Not. R. Astron. Soc., 452, 3334-3345 (2015/October-1)

KIC 4768731: a bright long-period roAp star in the Kepler field.

SMALLEY B., NIEMCZURA E., MURPHY S.J., LEHMANN H., KURTZ D.W., HOLDSWORTH D.L., CUNHA M.S., BALONA L.A., BRIQUET M., BRUNTT H., DE CAT P., LAMPENS P., THYGESEN A.O. and UYTTERHOEVEN K.

Abstract (from CDS):

We report the identification of 61.45/d (711.2 µHz) oscillations, with amplitudes of 62.6 µmag, in KIC 4768731 (HD 225914) using Kepler photometry. This relatively bright (V = 9.17) chemically peculiar star with spectral type A5 Vp SrCr(Eu) has previously been found to exhibit rotational modulation with a period of 5.21d. Fourier analysis reveals a simple dipole pulsator with an amplitude that has remained stable over a 4-yr time span, but with a frequency that is variable. Analysis of high-resolution spectra yields stellar parameters of Teff = 8100±200 K, logg = 4.0±0.2, [Fe/H] = +0.31±0.24 and v sini = 14.8±1.6 km/s. Line profile variations caused by rotation are also evident. Lines of Sr, Cr, Eu, Mg and Si are strongest when the star is brightest, while Y and Ba vary in antiphase with the other elements. The abundances of rare earth elements are only modestly enhanced compared to other roAp stars of similar Teff and logg. Radial velocities in the literature suggest a significant change over the past 30 yr, but the radial velocities presented here show no significant change over a period of 4 yr.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): asteroseismology - techniques: photometric - stars: abundances - stars: chemically peculiar - stars: individual: KIC 4768731 - stars: oscillations

CDS comments: p.3343: KIC 4768631 is a probable misprint for KIC 4768731. J1921 not identified (not enough ionformation).

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 1SWASP J000830.50+042818.1 * 00 08 30.5065118400 +04 28 18.185377764   10.42 10.16     ~ 2 0
2 V* AP Scl a2* 01 05 55.6980950160 -26 43 44.007202704   8.60 8.40     A2Vp 113 0
3 V* BW Cet a2* 01 31 16.4742701952 -11 07 07.935608352   9.63 9.38     ApSrEu 39 0
4 HD 12098 a2* 02 00 40.1774521766 +58 31 37.130534305   8.47 8.08 8.758   ~ 49 0
5 V* BN Cet a2* 02 06 15.8004336360 -19 07 26.305108608   10.56 10.17     ApSrEuCr 50 0
6 V* BT Hyi a2* 03 00 37.0849651248 -81 54 07.305942240   9.64 9.35     ApSrEuCr 51 0
7 HD 24355 Pe* 03 53 23.0955907416 +25 38 33.364337316   9.97 9.65     A5VSrSiEu 20 0
8 V* DO Eri a2* 03 55 16.1313315312 -12 05 56.727712752 6.35 6.32 6.00     A9VpSrEuCr 397 0
9 V* UV Lep a2* 06 11 21.7521470568 -15 47 35.016189504   7.01 6.75     ApSrCrEu 63 0
10 HD 258048 * 06 29 56.8471020864 +32 24 47.013032304   11.15 10.52     F8 6 0
11 TYC 8912-1407-1 * 06 51 42.1940065872 -63 25 49.547728884   12.26 11.51     ApSrEu(Cr) 9 0
12 V* V409 Car a2* 07 30 56.9886639144 -57 59 28.238685684   9.13 8.89     ApSr(Eu) 125 0
13 HD 69013 * 08 14 28.9689055920 -15 46 31.486504584   10.06 9.56     ApEuSr 25 0
14 HD 75445 PM* 08 48 42.9334141680 -39 14 01.940046864   7.40 7.12     ApSrEu(Cr) 60 0
15 TYC 2488-1241-1 * 08 55 22.2060296784 +32 42 36.288858780   11.3 10.8     ~ 5 0
16 V* LX Hya a2* 09 18 25.0298292960 -20 22 16.256631972   8.08 7.77     A9IIs 71 0
17 HD 83368 a2* 09 36 25.4255061727 -48 45 04.240404102   6.49 6.23     A8VSrCrEu 269 0
18 V* AI Ant a2* 09 41 34.3860562008 -29 22 25.415627484   9.74 9.36     ApSrEuCr 35 0
19 V* V437 Car a2* 09 54 53.4231457944 -58 41 45.371092740   9.70 9.38     ApSr 49 0
20 HD 92499 * 10 40 08.5912210416 -43 04 50.514871224   9.29 8.88     ApSrEuCr 40 0
21 V* TX Crt a2* 11 05 34.0436531568 -25 01 09.250435488   9.88 9.45     ApSrEuCr 41 0
22 HD 97127 * 11 10 53.9167670928 +17 03 47.530406160   9.83 9.43     G0 9 0
23 HD 99563 a2* 11 27 16.63609 -08 52 08.1942       9.193   A9III 81 0
24 V* V816 Cen dS* 11 37 37.0409608152 -46 42 34.877876832 8.99 8.79 8.03     F8/G0p 320 0
25 HD 115226 a2* 13 18 00.0189897768 -72 57 00.947433276   8.84 8.50     ApSr(Eu) 37 0
26 HD 116114 PM* 13 21 46.3079033856 -18 44 31.563482928   7.34 7.02     F0VpSrCrEu 140 0
27 V* LZ Hya a2* 13 41 19.8267324192 -28 46 59.793276288   10.41 9.92 9.63 9.659 ApSrEu(Cr) 49 0
28 V* PP Vir a2* 14 04 48.9376773456 +05 24 51.459774732   8.70 8.29     F0 80 0
29 TYC 2553-480-1 * 14 30 49.6431091200 +31 47 55.051464408   11.70 11.56     ~ 4 0
30 * alf Cir a2* 14 42 30.4206520931 -64 58 30.478845491 3.55 3.43 3.19 2.96 2.86 A7VpSrCrEu 364 0
31 HD 132205 * 15 00 03.8955061272 -55 03 00.047462040   9.15 8.72     ApEuSrCr 17 0
32 V* HI Lib a2* 15 09 02.4051867312 -13 59 58.675373736   7.84 7.46     F2VpSrCrEu 131 0
33 * bet CrB a2* 15 27 49.7540595700 +29 06 20.494640434 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 686 0
34 * 33 Lib a2* 15 29 34.7424021408 -17 26 27.377921220 7.22 7.07 6.69     F0VspEuGdSr 252 0
35 HD 143487 SB* 16 01 44.2211390328 -30 54 56.822787720   10.05 9.43     Apec 25 0
36 HD 148593 * 16 29 39.4754679240 -14 35 06.203642568   9.69 9.15     ApSrEuCr 13 0
37 2MASS J16400299-0737293 * 16 40 02.9922289896 -07 37 29.405212248           A7VpSrEu(Cr) 10 0
38 V* V835 Ara a2* 16 44 11.4498857664 -48 39 18.114773796   10.40 9.91     A/F(pEu) 36 0
39 HD 151860 * 16 52 58.6114850064 -54 09 45.729457092   9.41 9.01     ApSrEu(Cr) 18 0
40 HD 154708 a2* 17 10 28.5163457616 -58 00 17.416695708   9.23 8.76     ApSrEu 86 0
41 V* V834 Ara a2* 17 48 29.5532022648 -51 55 02.538979464   10.81 10.39     ApEuSrCr 28 0
42 V* V694 CrA a2* 18 12 25.8347418984 -37 45 09.271268532   8.34 7.92     ApSrCrEu 118 0
43 TYC 3130-2480-1 dS* 18 44 12.2812000704 +43 17 51.906430968   11.85 11.25     A2III 20 0
44 * 10 Aql a2* 18 58 46.9240671288 +13 54 23.941711692 6.23 6.14 5.89     A7VpSrEu_Ksn 285 0
45 TYC 3545-2756-1 a2* 19 05 26.5923938832 +47 15 48.314948904   10.86 10.66 10.56   F0V 30 0
46 BD+44 3063 gD* 19 06 27.5519195736 +44 50 33.430309584   10.60 10.19     A9V 29 0
47 HD 177765 * 19 07 09.7793979672 -26 19 54.506413128   9.60 9.15     ApSrEuCr 37 0
48 HD 180239 Pe* 19 13 41.2519522128 +45 34 50.825887896   10.07 9.83     kA3hA5mF3(IV)Am 19 0
49 BD+44 3113 dS* 19 21 54.9229365504 +44 59 42.077474196   9.86 9.62     F0Vn 18 0
50 V* V4373 Sgr a2* 19 39 20.4197579112 -29 44 34.466055252   10.37 9.96     FpSrEu 32 0
51 UCAC2 13032830 Pu* 19 40 07.8125259936 -44 20 09.320113320   13.35 13.09 13.21 12.72 A7VpEu(Cr) 10 0
52 TYC 3561-1857-1 Pe* 19 46 29.2100561736 +47 37 50.045262924   11.87 11.38 11.45   kA3hA5mA7SiEu 25 0
53 HD 225914 Pe* 19 48 26.7415463208 +39 51 58.045289040   9.353 9.170     A5VpSrCrEu 26 0
54 UCAC3 260-172923 * 19 48 27.7790230296 +39 51 58.662030708       11.31   ~ 1 0
55 V* CK Oct a2* 20 13 56.3652220104 -78 52 42.269446308   10.41 9.94     ApEuSr 46 0
56 V* QR Tel a2* 20 24 11.7818561520 -51 43 25.270017456   9.56 9.18     ApSrCrEu 40 0
57 V* AW Cap a2* 20 38 09.8033063304 -17 30 06.486664068   10.14 9.71     FpSrEu 33 0
58 * gam Equ a2* 21 10 20.5000721160 +10 07 53.691967776 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 552 0
59 V* BI Mic a2* 21 26 03.8683509936 -29 55 48.145296468   9.10 8.81     ApSrEu 81 0
60 V* MM Aqr a2* 22 33 12.3248929848 -20 02 21.880485816   10.058 9.582     A(pEuSrCr) 47 0
61 V* BP Gru a2* 23 01 46.8211202616 -44 50 26.878698672   7.99 7.52     ApSrSi: 129 0
62 V* CN Tuc a2* 23 09 27.7123518144 -63 39 12.107929716   9.62 9.38     ApEuSr 45 0
63 HD 218994 ** 23 13 16.03824 -60 35 02.8514           ApSr 38 0

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