2004A&A...423L..25O

Query : 2004A&A...423L..25O

2004A&A...423L..25O - Astronomy and Astrophysics, volume 423, L25-28 (2004/8-4)

Beyond the iron group: Heavy metals in hot subdwarfs.

O'TOOLE S.J.

Abstract (from CDS):

We report the discovery of strong photospheric resonance lines of Gaiii, Geiv, Sniv and Pbiv in the UV spectra of more than two dozen sdB and sdOB stars at temperatures ranging from 22000K to 40000K. Lines of other heavy elements are also detected, however in these cases more atomic data are needed. Based on these discoveries, we present a hypothesis to explain the apparent lack of silicon in sdB stars hotter than ∼32000K. The existence of triply ionised Ge, Sn, and Pb suggests that rather than silicon sinking deep into the photosphere, it is removed from the star in a fractionated stellar wind. This hypothesis provides a challenge to diffusion models of sdB stars.

Abstract Copyright: ∼

Journal keyword(s): stars: subdwarfs - stars: abundances

Simbad objects: 30

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Number of rows : 30
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 CD-38 222 HS* 00 42 58.3063027488 -38 07 37.291406772   10.19 10.26     sdB 64 0
2 HD 4539 HS* 00 47 29.2193758344 +09 58 55.690280832 9.17 10.12 10.24     sdB 92 0
3 PG 0057+155 HS* 00 59 56.6673699744 +15 44 13.740284580   12.02 12.32     sdB0.2VIIIpHe8 126 1
4 AzV 304 * 01 02 21.4823289456 -72 39 14.587308576   14.66 14.77     B0.5V 48 0
5 PG 0133+114 HS* 01 36 26.1919824456 +11 39 32.100292692   10.74       sdB1.5VIIHe4 43 0
6 CD-24 731 HS* 01 43 48.5449039272 -24 05 10.223541204   11.6 11.9     sdBHe0 68 0
7 PG 0342+026 HS* 03 45 34.5760235952 +02 47 52.714095360   10.844 10.926 11.186   sdB3VIIHe4 46 0
8 CPD-64 481 HS* 05 47 59.3028778320 -64 23 03.123185352   10.97 11.17     sdB 40 0
9 * ksi01 CMa bC* 06 31 51.3662820799 -23 25 06.319934859 3.10 4.09 4.33 4.45 4.72 B0.7IV 322 0
10 BD+34 1543 HS* 07 10 07.7039318016 +34 24 53.808705504   10.29 10.17     sdB+F? 31 0
11 PG 1032+406 HS* 10 35 16.5804370224 +40 21 14.417268660   11.38 11.81     sdB 43 1
12 PG 1104+243 HS* 11 07 26.2324234560 +24 03 11.108174724   11.49 11.39     sdOB+G2V 33 0
13 Feige 46 HS* 11 37 26.3700943344 +14 10 14.108131740   12.94 13.24     sdO 58 0
14 Feige 48 HS* 11 47 14.4978515760 +61 15 31.789400364   13.12 13.28     sdB 119 0
15 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 84 1
16 Feige 65 HS* 12 35 51.1437498960 +42 22 39.720230508   11.78 12.046     sdB2 70 1
17 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 246 0
18 BD-07 3477 HS* 12 44 20.2386233232 -08 40 16.846099536   10.46 10.594 10.895   sdB2VIIHe3 288 1
19 HZ 44 HS* 13 23 35.2629445608 +36 07 59.544140304 10.186 11.42 11.65 12.00 11.995 sdBN0VIIHe28 419 0
20 PG 1352-023 HS* 13 55 04.6673960784 -02 30 21.803691528   11.82 12.43     sdO8VIIIHe7 21 1
21 * chi Lup SB* 15 50 57.5453432166 -33 37 37.728345509 3.77 3.909 3.946     B9III 306 0
22 PG 1605+072 HS* 16 08 03.6872637792 +07 04 28.748468964   12.53 12.83 13.18   sdB0.2VIHe3 133 0
23 HD 149382 HS* 16 34 23.3333693424 -04 00 52.030152000 7.518 8.661 8.943 9.070 9.205 sdB 139 1
24 [CW83] 1758+36 HS* 18 00 18.8640522672 +36 28 56.335373724 10.04 11.17 11.39 11.38   sdB0 35 1
25 HD 171858 HS* 18 37 56.6714756304 -23 11 35.188389420   9.64 9.85     sdB 41 0
26 HD 185510 RS* 19 39 38.8187091672 -06 03 49.460337108   9.44 8.235   6.967 K0III+sdB 109 0
27 HD 205805 HS* 21 39 10.6154323536 -46 05 51.525534876 9.05 9.98 10.21     sdB 80 0
28 V* FF Aqr EB* 22 00 36.4255860432 -02 44 26.868642108   10.23 9.408   8.245 G8III+sdO 115 0
29 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 636 1
30 CD-30 19716 HS* 23 52 36.0934149768 -30 10 09.116408172   11.97 12.86     sdO6He2 34 0

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