2008A&A...481..453M


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.02CET02:49:44

2008A&A...481..453M - Astronomy and Astrophysics, volume 481, 453-463 (2008/4-2)

Nitrogen enrichment, boron depletion and magnetic fields in slowly-rotating B-type dwarfs.

MOREL T., HUBRIG S. and BRIQUET M.

Abstract (from CDS):

Evolutionary models for massive stars, accounting for rotational mixing effects, do not predict any core-processed material at the surface of B dwarfs with low rotational velocities. Contrary to theoretical expectations, we present a detailed and fully-homogeneous, NLTE abundance analysis of 20 early B-type dwarfs and (sub)giants that reveals the existence of a population of nitrogen-rich and boron-depleted, yet intrinsically slowly-rotating objects. The low-rotation rate of several of these stars is firmly established, either from the occurrence of phase-locked UV wind line-profile variations, which can be ascribed to rotational modulation, or from theoretical modelling in the pulsating variables. The observational data presently available suggest a higher incidence of chemical peculiarities in stars with a (weak) detected magnetic field. This opens the possibility that magnetic phenomena are important in altering the photospheric abundances of early B dwarfs, even for surface field strengths at the one hundred Gauss level. However, further spectropolarimetric observations are needed to assess the validity of this hypothesis.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: fundamental parameters - stars: abundances - stars: atmospheres - stars: magnetic fields

Simbad objects: 29

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Number of rows : 29

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 * gam Peg bC* 00 13 14.1512308 +15 11 00.936759 1.75 2.61 2.84 2.94 3.13 B2IV 665 0
2 * zet Cas Pu* 00 36 58.2841866 +53 53 48.867311 2.58 3.47 3.66 3.74 3.95 B2IV 424 0
3 * del Cet bC* 02 39 28.95579 +00 19 42.6345 2.97 3.85 4.07     B2IV 368 0
4 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5857 1
5 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 373 0
6 * pi.04 Ori SB* 04 51 12.3647208 +05 36 18.372305 2.700 3.500 3.680 3.74 3.90 B2III 298 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15197 1
8 * gam Ori V* 05 25 07.86325 +06 20 58.9318 0.54 1.42 1.64 1.73 1.95 B2V 504 1
9 HD 36591 V* 05 32 41.3503640106 -01 35 30.577451332 4.240 5.150 5.340     B2II/III 230 1
10 * tet01 Ori C ** 05 35 16.4664092288 -05 23 22.897102710 4.20 5.15 5.13 4.91 4.73 O7Vp 1294 1
11 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 690 0
12 * ksi01 CMa bC* 06 31 51.3663578 -23 25 06.318090 3.10 4.09 4.33 4.45 4.72 B0.7IV 302 0
13 * 15 CMa bC* 06 53 32.9071871 -20 13 27.317715 3.66 4.62 4.83 4.95 5.17 B1Ib 198 0
14 * iot CMa bC* 06 56 08.2241266 -17 03 15.267468 3.62 4.297 4.385 6.40   B3Ib/II 162 1
15 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 466 1
16 HD 66522 * 08 01 35.1016487145 -50 36 20.161089250 6.61 7.26 7.19     B2III 46 0
17 HD 85953 Pu* 09 53 50.0988444333 -51 08 48.151332908 5.02 5.777 5.932     B2.5III 70 1
18 * tet Car SB* 10 42 57.4019674 -64 23 40.020796 1.53 2.54 2.76 2.87 3.10 B0Vp 316 0
19 HD 96446 Pu* 11 06 05.8217576741 -59 56 59.536118851 5.81 6.57 6.69     B2IIIp 153 0
20 * bet Cru bC* 12 47 43.26877 -59 41 19.5792 0.03 1.02 1.25 1.38 1.64 B1IV 325 0
21 V* V836 Cen bC* 14 46 25.7600874450 -37 13 20.072260223 7.04 7.88 8.05     B2 104 0
22 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 865 0
23 * tet Oph bC* 17 22 00.5793468 -24 59 58.366974 2.18 3.03 3.26 3.38 3.58 OB 317 0
24 V* V2052 Oph bC* 17 56 18.3998830562 +00 40 13.276647618 5.28 5.874 5.820     B3III 202 0
25 HD 180642 bC* 19 17 14.8041207725 +01 03 33.905280608 7.83 8.47 8.29     B1.5II-III 93 0
26 HD 191612 SB* 20 09 28.6111448914 +35 44 01.287772714 7.40 8.07 7.80     O8fpe 217 0
27 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 687 0
28 * 12 Lac bC* 22 41 28.6491950195 +40 13 31.619242453 4.24 5.080 5.229     B2III 347 0
29 * 1 Cas * 23 06 36.8178557 +59 25 11.135698 3.93 4.771 4.840     B0.5III 232 0

    Equat.    Gal    SGal    Ecl

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2021.03.02-02:49:44

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