2001ApJ...548..429P

Query : 2001ApJ...548..429P

2001ApJ...548..429P - Astrophys. J., 548, 429-438 (2001/February-2)

Boron abundances in early B stars: results from the B III resonance line in IUE data.

PROFFITT C.R. and QUIGLEY M.F.

Abstract (from CDS):

We have used archival International Ultraviolet Explorer high-dispersion SWP spectra to study the B III resonance line at 2065.8 Å in 44 early B stars. We find a median boron abundance about half that of solar system meteoritic material, consistent with the values found from previous studies of boron in early B stars. About one-third of the stars studied appear to have boron abundances that are a factor of 4 or more lower than this median. Many of these are stars with enhanced nitrogen abundances, confirming the belief that deep envelope mixing can occur in main-sequence B stars. A few stars with low boron abundances have normal N/C ratios. It is unclear whether all of these can be explained as stars where mixing depleted the boron but did not go deep enough to bring CN-processed material to the surface or if some stars were actually formed with an unusually low boron abundance.

Abstract Copyright: ∼

Journal keyword(s): Stars: Abundances - Stars: Early-Type - Ultraviolet: Stars

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 - 2026 		#notes
1 * gam Peg bC* 00 13 14.1523490172 +15 11 00.954346538 1.75 2.61 2.84 2.94 3.13 B2IV 720 0
2 * zet Cas bC? 00 36 58.2844874846 +53 53 48.877599163 2.58 3.47 3.66 3.74 3.95 B2IV 470 0
3 * del Cet bC* 02 39 28.9568473856 +00 19 42.631195332 2.97 3.85 4.07     B2IV 395 0
4 Ass Per OB 2 As* 03 42.2 +33 26           ~ 350 0
5 * o Per * 03 42 22.6459308614 +33 57 54.093701142 4.13 4.912 4.972     B0.5V 315 0
6 NAME CAS-TAU ASS MGr 04 16 +27.6           ~ 86 1
7 * nu. Eri bC* 04 36 19.1419185396 -03 21 08.857744927 2.82 3.737 3.928     B2III 407 0
8 * pi.04 Ori SB* 04 51 12.3657730111 +05 36 18.373859886 2.700 3.500 3.680 3.74 3.90 B2III 319 0
9 V* AE Aur Or* 05 16 18.1493304816 +34 18 44.344404000 5.48 6.18 5.96     O9.5V 597 1
10 * lam Lep ** 05 19 34.5223081894 -13 10 36.369844928 3.03 4.04 4.29 4.41 4.69 B0.5V 322 0
11 * o Ori SB* 05 21 45.7473567408 -00 22 56.880734196 3.79 4.58 4.74 4.79 4.97 B2IV 246 0
12 * 8 Lep SB* 05 23 30.1560451200 -13 55 38.470509624   5.026 5.229     B2IV 88 0
13 HD 35299 Pu* 05 23 42.3086240496 -00 09 35.347024692 4.610 5.490 5.700 5.77 5.96 B1.5V 217 0
14 * gam Ori V* 05 25 07.86325 +06 20 58.9318 0.54 1.42 1.64 1.73 1.95 B2III 542 1
15 HD 36285 * 05 30 20.7537108216 -07 26 05.338118076 5.29 6.130 6.313     B2V 130 0
16 * n01 Ori ** 05 31 14.53183 +03 17 31.6729 4.47 5.29 5.46 5.51 5.72 B3II/III 142 0
17 HD 36430 * 05 31 20.8933113744 -06 42 30.168166680 5.29 6.041 6.208     B3V 144 0
18 * ups Ori SB* 05 31 55.8599595648 -07 18 05.535884975 3.30 4.36 4.63 4.75 5.01 O9.7V 426 0
19 HD 36591 V* 05 32 41.3510096736 -01 35 30.595447356 4.240 5.15 5.34     B1IV 255 0
20 HD 36629 Y*O 05 32 57.0824474232 -04 33 59.339585016 7.01 7.67 7.65 7.53 7.53 B2V 201 0
21 Ass Ori OB 1b As* 05 34.0 -01 30           ~ 281 0
22 HD 36959 Y*O 05 35 01.0070120496 -06 00 33.366713364 4.52 5.33 5.53     B1V 223 0
23 HD 36960 * 05 35 02.6823091513 -06 00 07.308349203 3.52 4.50 4.72     B0.5V 283 0
24 * tet01 Ori A Ae* 05 35 15.8254015008 -05 23 14.334699480 5.87 6.75 6.73 6.42 6.21 B0V 508 0
25 NAME Ori Trapezium OpC 05 35 16.5 -05 23 14           ~ 1708 1
26 * tet01 Ori D Y*O 05 35 17.2574479992 -05 23 16.570738104 6.08 6.79 6.70 6.40 6.20 B1.5Vp 340 0
27 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 142 1
28 V* MX Ori Or* 05 35 21.2653329384 -05 09 16.174506564   10.9 10.30     K2Ve 85 0
29 * tet02 Ori B Y*O 05 35 26.4007537560 -05 25 00.793767576 5.36 6.29 6.38 6.29 11.050 B0.7V 206 0
30 HD 37209A bC? 05 36 35.6933463600 -06 03 53.102455123 4.61 5.535 5.750     B2IV 142 0
31 HD 37356 V* 05 37 53.3851682160 -04 48 50.525298828 5.42 6.14 6.18 6.11 6.11 B3V 153 0
32 NAME Ori I As* 05 38 -02.8           ~ 653 0
33 HD 37481 bC? 05 38 37.9735682376 -06 34 26.246963640 4.82 5.73 5.96     B1.5IV 141 0
34 HD 37744 V* 05 40 37.2968503824 -02 49 30.852237396 5.14 6.02 6.22     B1.5V 164 0
35 * nu. Ori SB* 06 07 34.3251233989 +14 46 06.510739548 3.6 4.240 4.397     B3IV 239 0
36 * bet CMa bC* 06 22 41.9853527 -17 57 21.307352 0.77 1.73 1.97 2.11 2.35 B1II-III 748 0
37 * ksi01 CMa bC* 06 31 51.3662820799 -23 25 06.319934859 3.10 4.09 4.33 4.45 4.72 B0.7IV 336 0
38 * 15 CMa bC* 06 53 32.9069226414 -20 13 27.309395177 3.66 4.62 4.83 4.95 5.17 B1IV 214 0
39 * iot CMa s*b 06 56 08.2245944314 -17 03 15.259069948 3.62 4.297 4.385 6.40   B3Ib 184 0
40 Cl Collinder 121 OpC 06 56 20 -24 43.8   3.02 2.6     ~ 156 0
41 * eps CMa * 06 58 37.54876 -28 58 19.5102 0.36 1.29 1.50 1.59 1.80 B1.5II 519 0
42 * alf Pyx V* 08 43 35.5374303414 -33 11 10.979806079 2.65 3.50 3.68 3.76 3.93 B1.5III 224 0
43 * bet Cru bC* 12 47 43.26877 -59 41 19.5792 0.03 1.02 1.25 1.38 1.64 B1IV 360 1
44 * mu.01 Cru Pu* 12 54 35.6242611666 -57 10 40.528916907 3.12 3.87 4.04 4.14 4.38 B2IV-V 159 0
45 * chi Cen bC* 14 06 02.7680367867 -41 10 46.678474802 3.4 4.155 4.343     B2V 231 1
46 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
47 * iot Her bC* 17 39 27.8868980278 +46 00 22.792978043 2.940 3.630 3.800     B3IV 470 1
48 * eta Lyr SB* 19 13 45.4884201191 +39 08 45.477640475 3.58 4.243 4.398     B6 166 0
49 * 8 Cyg Pu* 19 31 46.3218386 +34 27 10.687443 3.95 4.60 4.72     B3IV 130 0
50 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 756 0
51 Ass Cep OB 1 As* 22 29 +56.6           ~ 91 0
52 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 790 0
53 NAME I Lac As* 22 41 +38.5           ~ 158 0
54 * 12 Lac bC* 22 41 28.6495065456 +40 13 31.609736580 4.24 5.080 5.229     B1.5III 369 0
55 * 16 Lac bC* 22 56 23.6299283136 +41 36 13.948480440 4.61 5.436 5.587     B2IVs 325 0
56 Ass Ori OB 1a As* ~ ~           ~ 237 0

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