2018MNRAS.476..601H


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST13:20:44

2018MNRAS.476..601H - Mon. Not. R. Astron. Soc., 476, 601-616 (2018/May-1)

Suppressed phase variations in a high amplitude rapidly oscillating Ap star pulsating in a distorted quadrupole mode.

HOLDSWORTH D.L., SAIO H., BOWMAN D.M., KURTZ D.W., SEFAKO R.R., JOYCE M., LAMBERT T. and SMALLEY B.

Abstract (from CDS):

We present the results of a multisite photometric observing campaign on the rapidly oscillating Ap (roAp) star 2MASS 16400299-0737293 (J1640; V = 12.7). We analyse photometric B data to show the star pulsates at a frequency of 151.93 d–1 (1758.45 µHz; P = 9.5 min) with a peak-to-peak amplitude of 20.68 mmag, making it one of the highest amplitude roAp stars. No further pulsation modes are detected. The stellar rotation period is measured at 3.674 7 ± 0.000 5 d, and we show that rotational modulation due to spots is in antiphase between broad-band and B observations. Analysis and modelling of the pulsation reveals this star to be pulsating in a distorted quadrupole mode, but with a strong spherically symmetric component. The pulsational phase variation in this star is suppressed, leading to the conclusion that the contribution of l > 2 components dictate the shape of phase variations in roAp stars that pulsate in quadrupole modes. This is only the fourth time such a strong pulsation phase suppression has been observed, leading us to question the mechanisms at work in these stars. We classify J1640 as an A7 Vp SrEu(Cr) star through analysis of classification resolution spectra.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): asteroseismology - techniques: photometric - stars: chemically peculiar - stars: individual: J1640 - stars: magnetic field - stars: oscillations

Simbad objects: 46

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Number of rows : 46

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* AP Scl a2* 01 05 55.7024515557 -26 43 43.987109070   8.60 8.40     A2Vp 105 0
2 V* BW Cet a2* 01 31 16.4758182046 -11 07 07.915958500   9.63 9.38     ApSrEu 35 0
3 HD 12098 a2* 02 00 40.1781 +58 31 37.100           ~ 45 0
4 V* BN Cet a2* 02 06 15.8110823501 -19 07 26.207320762   10.56 10.17     ApSrEuCr 44 0
5 V* BT Hyi a2* 03 00 37.0866229611 -81 54 07.306588727   9.64 9.35     ApSrEuCr 45 0
6 HD 24355 * 03 53 23.0957720041 +25 38 33.368211135   9.97 9.65     A7/F0 17 0
7 V* DO Eri a2* 03 55 16.1314636284 -12 05 56.729555672 6.35 6.32 6.00     A9VpSrEuCr 383 0
8 V* UV Lep a2* 06 11 21.7520136800 -15 47 35.014376763   7.01 6.75     ApSrCrEu 55 0
9 V* V409 Car a2* 07 30 56.9889252164 -57 59 28.237596257   9.13 8.89     ApSr(Eu) 116 0
10 HD 69013 * 08 14 28.9690386892 -15 46 31.484925235   10.06 9.56     ApEuSr 22 0
11 HD 75445 PM* 08 48 42.9335149812 -39 14 01.937632656   7.40 7.12     ApSrEu(Cr) 52 0
12 V* LX Hya a2* 09 18 25.0296735695 -20 22 16.252280131   8.08 7.77     ApSr(Eu) 64 0
13 HD 83368 a2* 09 36 25.40686 -48 45 04.2549   6.480 6.232     A8VSrCrEu+F9V 259 0
14 V* AI Ant a2* 09 41 34.3857478751 -29 22 25.409057993   9.74 9.36     ApSrEuCr 32 0
15 V* V437 Car a2* 09 54 53.4232971616 -58 41 45.366175243   9.70 9.38     ApSr 42 0
16 HD 92499 * 10 40 08.5912070601 -43 04 50.513198108   9.29 8.88     ApSrEuCr 33 0
17 V* TX Crt a2* 11 05 34.0435676759 -25 01 09.247433076   9.88 9.45     ApSrEuCr 32 0
18 HD 99563 a2* 11 27 16.63609 -08 52 08.1942           A9III 73 0
19 V* V816 Cen dS* 11 37 37.0411005456 -46 42 34.875395453 8.99 8.79 8.03     F8/G0p 299 0
20 HD 115226 a2* 13 18 00.0187343885 -72 57 00.946459151   8.84 8.50     ApSr(Eu) 30 0
21 HD 116114 PM* 13 21 46.3077068552 -18 44 31.541856988   7.34 7.02     F0VpSrCrEu 124 0
22 V* LZ Hya a2* 13 41 19.8265550879 -28 46 59.792972629   10.41 9.92 9.63 9.659 ApSrEu(Cr) 43 0
23 V* PP Vir a2* 14 04 48.9378026422 +05 24 51.462293664   8.70 8.29     F0 73 0
24 * alf Cir a2* 14 42 30.4195804 -64 58 30.493451 3.55 3.43 3.19 2.96 2.86 A7VpSrCrEu 339 0
25 HD 132205 * 15 00 03.8951631966 -55 03 00.043749248   9.15 8.72     ApEuSrCr 15 0
26 V* HI Lib a2* 15 09 02.4050629548 -13 59 58.672652036   7.84 7.46     F2VpSrCrEu 122 0
27 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 662 0
28 * 33 Lib a2* 15 29 34.7422042672 -17 26 27.375775287 7.22 7.07 6.69     F0VspEuGdSr 240 0
29 HD 148593 * 16 29 39.4754947973 -14 35 06.202487399   9.69 9.15     ApSrEuCr 12 0
30 2MASS J16400299-0737293 * 16 40 02.9921941279 -07 37 29.405138099           A7VpSrEu(Cr) 8 0
31 HD 151860 * 16 52 58.6113102653 -54 09 45.730350647   9.41 9.01     ApSrEu(Cr) 16 0
32 HD 154708 a2* 17 10 28.5160730229 -58 00 17.417264870   9.23 8.76     ApSrEu 76 0
33 V* V694 CrA a2* 18 12 25.8347315452 -37 45 09.274292137   8.34 7.92     ApSrCrEu 108 0
34 TYC 3130-2480-1 Ro* 18 44 12.2813520634 +43 17 51.900923140   11.85 11.25     A2III 17 0
35 * 10 Aql a2* 18 58 46.9239770704 +13 54 23.944546333 6.23 6.14 5.89     A7VpSrEu_Ksn 275 0
36 TYC 3545-2756-1 a2* 19 05 26.5926508995 +47 15 48.309683264   10.86 10.66 10.56   F0V 27 0
37 HD 177765 * 19 07 09.7792915616 -26 19 54.507708452   9.60 9.15     ApSrEuCr 32 0
38 V* V4373 Sgr a2* 19 39 20.4197373866 -29 44 34.465535102   10.37 9.96     FpSrEu 29 0
39 UCAC2 13032830 Pu* 19 40 07.8124501576 -44 20 09.319055866   13.35 13.09 13.21 12.72 A7VpEu(Cr) 7 0
40 TYC 3561-1857-1 Ro* 19 46 29.2104444682 +47 37 50.047132931   11.87 11.38 11.45   Ap 19 0
41 HD 225914 Ro* 19 48 26.7416483218 +39 51 58.043549294   9.353 9.170     A5VpSrCrEu 23 0
42 * gam Equ a2* 21 10 20.5001160337 +10 07 53.682085548 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 522 0
43 V* MM Aqr a2* 22 33 12.3249013034 -20 02 21.883718530   10.058 9.582     A(pEuSrCr) 40 0
44 V* BP Gru a2* 23 01 46.8212643426 -44 50 26.878058323   7.99 7.52     ApSrSi: 120 0
45 V* CN Tuc a2* 23 09 27.7128494220 -63 39 12.112479629   9.62 9.38     ApEuSr 38 0
46 CCDM J23133-6035AB ** 23 13 16.03824 -60 35 02.8514   8.8 8.56     ApSr 29 1

    Equat.    Gal    SGal    Ecl

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2021.04.14-13:20:44

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