2007A&A...466..269B


Query : 2007A&A...466..269B

2007A&A...466..269B - Astronomy and Astrophysics, volume 466, 269-276 (2007/4-4)

On the co-existence of chemically peculiar Bp stars, slowly pulsating B stars and constant B stars in the same part of the HR diagram.

BRIQUET M., HUBRIG S., DE CAT P., AERTS C., NORTH P. and SCHOELLER M.

Abstract (from CDS):

In order to better model massive B-type stars, we need to understand the physical processes taking place in slowly pulsating B (SPB) stars, chemically peculiar Bp stars, and non-pulsating normal B stars co-existing in the same part of the H-R diagram. We carry out a comparative study between samples of confirmed and well-studied SPB stars and a sample of well-studied Bp stars with known periods and magnetic field strengths. We determine their evolutionary state using accurate HIPPARCOS parallaxes and Geneva photometry. We discuss the occurrence and strengths of magnetic fields as well as the occurrence of stellar pulsation among both groups. Further, we make a comparison of Geneva photometric variability for both kinds of stars. The group of Bp stars is significantly younger than the group of SPB stars. Longitudinal magnetic fields in SPB stars are weaker than those of Bp stars, suggesting that the magnetic field strength is an important factor for B type stars to become chemically peculiar. The strongest magnetic fields appear in young Bp stars, indicating a magnetic field decay in stars at advanced ages. Rotation periods of Bp and pulsation periods of SPB stars are of the same order and the behaviour of Geneva photometric variability of some Bp stars cannot be distinguished from the variability of SPB stars, illustrating the difficulty to interpret the observed variability of the order of days for B-type stars. We consider the possibility that pulsation could be responsible for the variability among chemically peculiar stars. In particular, we show that a non-linear pulsation model is not excluded by photometry for the Bp star HD175362.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: magnetic fields - stars: oscillations - stars: fundamental parameters - stars: early-type - stars: individual: HD 175362

Simbad objects: 56

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Number of rows : 56
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 53 Psc bC* 00 36 47.3110003896 +15 13 54.190332948 5.06 5.714 5.863     B2.5IV 113 1
2 * zet Cas Pu* 00 36 58.2841866 +53 53 48.867311 2.58 3.47 3.66 3.74 3.95 B2IV 436 0
3 * alf Scl Ro* 00 58 36.3593029 -29 21 26.824714 3.52 4.09 4.27 4.30 4.43 B7IIIp 246 0
4 * nu. For a2* 02 04 29.4386071 -29 17 48.547752 4.01 4.52 4.69 4.73 4.87 B9.5IIIspSi 143 0
5 * 56 Ari a2* 03 12 14.2461137352 +27 15 25.085668788 5.22 5.64 5.76     B6IV-V 256 0
6 HD 21071 Pu* 03 25 57.3820460520 +49 07 14.729885580 5.53 6.02 6.09     B7V 158 0
7 HD 21699 Ro* 03 32 08.6084197968 +48 01 24.528548676 4.81 5.355 5.461     B9III 200 0
8 * 20 Eri a2* 03 36 17.4041095200 -17 28 01.472307996 4.61 5.10 5.23     B8/9III 170 0
9 V* V766 Tau a2* 03 51 15.8701556232 +13 02 45.880979100 5.88 6.32 6.38 6.36 6.39 B9pSi 97 0
10 * tau08 Eri SB* 03 53 42.7023562560 -24 36 44.021417544   4.496 4.623     B6V 110 0
11 * 41 Tau a2* 04 06 36.4125948768 +27 35 59.640149616   5.041 5.172     Ap 231 0
12 HD 26326 Pu* 04 09 17.8360611792 -16 23 09.080258964   5.286 5.435     B5IV 79 0
13 HD 27026 Pu* 04 18 08.1089490240 +42 08 28.194401724   6.132 6.205   6.27 B9V 46 0
14 * d Per bC* 04 21 33.1662438000 +46 29 55.964841936 4.31 4.757 4.812     B4IV 185 1
15 HD 28114 bC* 04 26 21.1022491080 +08 35 24.952062192 5.65 6.046 6.055     B6IV 73 1
16 HD 28843 Ro* 04 32 37.5537339576 -03 12 34.344832032 5.13 5.67 5.81     B9III 128 0
17 V* IQ Aur a2* 05 19 00.0284573784 +33 44 54.220806888   5.201 5.371     A0p 282 0
18 HD 34798 Pu* 05 19 17.4371850792 -18 31 11.705799792 5.65 6.23 6.39     B5Vs 85 0
19 V* V1179 Ori a2* 05 36 06.2338022808 -07 23 47.317093944   7.31 7.38     B8V 87 0
20 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 308 0
21 * 12 CMa a2* 06 47 01.4835271104 -21 00 55.451696472 5.27 5.89 6.08     B7II/III 136 0
22 HD 53921 ** 07 03 15.09928 -59 10 41.1857           B9III+B8V 63 0
23 HD 64740 * 07 53 03.6353775 -49 36 46.952967 3.48 4.40 4.63 4.76 4.97 B2V 197 0
24 * 47 Vel a2* 08 35 52.0273953624 -50 58 10.728609996   5.651 5.782     ApSi 102 0
25 * omi Vel Pu* 08 40 17.5855320 -52 55 18.800233 2.8 3.44 3.63     B3/5(V) 168 1
26 V* HY Vel SB* 08 42 25.3862731 -53 06 50.343091 3.97 4.655 4.815     B3IV 164 0
27 HD 92287 SB* 10 38 02.6423647248 -57 15 22.689748476 5.14 5.749 5.876     B3IV 76 0
28 V* V364 Car a2* 10 40 11.4474547680 -65 06 00.752607072 4.79 5.36 5.52     ApSi 139 0
29 V* V869 Cen SB* 14 09 35.0324964096 -51 30 16.832689380   5.913 5.961     B8V 87 0
30 * a Cen Ro* 14 23 02.2390294 -39 30 42.549250 3.50 4.24 4.42 4.53 4.70 B2V 263 0
31 V* HZ Lup a2* 15 06 33.1978166352 -30 55 06.533677056   5.893 5.977     ApSi 102 0
32 HD 134837 * 15 13 07.6617482160 -36 05 29.109491844   5.996 6.079     B8V 44 1
33 V* NN Aps a2* 15 31 27.1154643312 -71 03 43.664769144   6.76 6.87     Ap(SiCrFe) 88 0
34 HD 138764 Pu* 15 34 26.5142062512 -09 11 00.380211288 4.63 5.08 5.17 5.21 5.33 B5V 151 0
35 * 25 Ser SB* 15 46 05.6365266672 -01 48 15.085342728 4.96 5.37 5.39     B8IV/V 109 0
36 * 3 Sco Ro* 15 54 39.5296532472 -25 14 37.459966128 5.23 5.81 5.87     B8III/IV 203 0
37 * 47 Lib Ro* 15 55 00.3615238176 -19 22 58.554643620   5.930 5.957     B2/3V 116 0
38 V* V913 Sco Ro* 15 58 34.8665694960 -24 49 53.361727284 4.70 5.34 5.43     B5V 195 0
39 HD 144334 ** 16 06 06.3891324384 -23 36 22.849641396 5.29 5.84 5.92     B8V 185 0
40 NAME Upper Sco Association As* 16 12 -23.4           ~ 1218 1
41 * tau Her Pu* 16 19 44.43666 +46 18 48.1123 3.190 3.73 3.87 4.00 4.16 B5IV 394 0
42 V* V933 Sco a2* 16 20 05.4927999744 -20 03 23.030685720   7.56 7.40     B9II/III 183 0
43 V* V911 Sco a2* 16 52 27.4149431256 -40 43 23.358090648   6.184 6.315     ApSiSr: 61 0
44 * iot Her bC* 17 39 27.8860861 +46 00 22.800110 2.940 3.630 3.800     B3IV 438 1
45 HD 164245 * 18 01 48.3019358064 -36 22 40.275786540 5.94 6.274 6.296     B8V 35 0
46 V* V4050 Sgr a2* 18 22 53.0754352224 -36 40 10.400061108   5.20 5.34     B7Ib/II 161 0
47 HD 169820 ** 18 25 55.2301152192 +14 57 58.450695732   6.321 6.364     B9V 47 0
48 V* V686 CrA a2* 18 56 40.4859327624 -37 20 35.701261512 4.53 5.24 5.38     B3V 199 0
49 HD 181558 Pu* 19 21 37.1135468520 -19 14 04.045448508 5.65 6.16 6.26     B5III 64 0
50 * 3 Vul Pu* 19 22 50.8855509384 +26 15 44.667340056 4.53 5.065 5.192     B6III 120 0
51 V* V2015 Cyg a2* 20 33 54.8435604456 +46 41 37.867484940   5.626 5.769     B8pSi 97 0
52 HD 205265 * 21 34 53.0019484080 -29 41 46.026105288   6.306 6.420     B8III 29 0
53 HD 206540 * 21 42 32.9604290136 +10 49 27.536143944   5.926 6.051     B5IV 65 0
54 * 16 Peg Be* 21 53 03.7682618 +25 55 30.490138 4.24 4.921 5.081     B3Ve 163 0
55 HD 212986 * 22 26 59.1778485600 +56 26 00.838979844   6.472 6.577     B7III 47 0
56 * ksi Oct Pu* 22 50 22.8139009656 -80 07 25.841844408 4.7 5.180 5.311     B6V 89 0

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2022.10.02-02:45:45

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