2003ApJ...592..504S

Query : 2003ApJ...592..504S

2003ApJ...592..504S - Astrophys. J., 592, 504-515 (2003/July-3)

Binary blue metal-poor stars: evidence for asymptotic giant branch mass transfer.

SNEDEN C., PRESTON G.W. and COWAN J.J.

Abstract (from CDS):

We present new abundance analyses of six blue metal-poor (BMP) stars with very low iron abundances ([Fe/H]←2), based on new high-resolution echelle spectra. Three are spectroscopic binaries, and three have constant radial velocities. The chemical compositions of these two groups are very different, as the binary BMP stars have large enhancements of carbon and neutron-capture elements that are products of s-process nucleosynthesis. One star, CS 29497-030, has an extreme enhancement of lead, [Pb/Fe]=+3.7, the largest abundance in any star yet discovered. It probably also has an oxygen overabundance compared to the other BMP stars of our sample. The binary BMP stars must have attained their status via mass transfer during the asymptotic giant branch (AGB) evolutions of their companion stars, which are now unseen and most likely are compact objects. We have not found any examples of AGB mass transfer among BMP binaries with [Fe/H]>-2.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Halo - Nuclear Reactions, Nucleosynthesis, Abundances - Stars: Abundances - Stars: Population II

Simbad objects: 28

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Number of rows : 28
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 SB 68 PM* 00 12 00.8360353968 -33 59 50.434576800   13.48 13.12     A 13 0
2 HE 0024-2523 Pe* 00 27 27.6486469632 -25 06 28.289948508 15.067 15.353 14.908 14.884   CEMP-s 69 0
3 GD 625 PM* 00 35 50.8974940632 -17 57 00.561358548   14.42 14.04 14.21   ~ 12 0
4 CD-24 266 BS* 00 40 47.9313619824 -24 07 34.183333668   12.955 12.656 12.441 12.216 CEMP-s 100 0
5 CD-31 306 BS* 00 50 15.7694498016 -30 59 56.192808696   12.73 12.72     F3VkA2mA2 38 0
6 HE 0058-0244 Pe* 01 00 53.0234702616 -02 28 19.950391884   14.42 13.73 13.331 12.942 CEMP-r/s 40 0
7 BPS CS 22946-0011 SB* 01 19 11.6738109192 -19 23 58.128899532   14.28 13.95     ~ 12 0
8 [PS72] 298 SB* 01 22 45.5857455432 -28 24 29.872013580   14.57 14.26     A1w 14 0
9 BD-16 251 RG* 01 29 31.1311443552 -16 00 45.495314460 12.527 12.427 11.642 11.189 10.713 CEMP 318 0
10 BPS CS 22963-0013 PM* 02 53 53.7576617736 -06 42 17.792797860   13.82 13.51     ~ 10 0
11 V* ST Ret Mi* 04 17 41.3027536296 -60 35 41.934981444           ~ 15 0
12 BPS CS 22874-0009 * 14 34 23.1652039128 -26 17 37.594213908   13.92 13.58     ~ 17 0
13 BPS CS 22890-0069 SB* 15 24 12.2840917464 +03 05 06.400027860   12.93 12.71     ~ 11 0
14 BD+17 3248 HB* 17 28 14.4690179544 +17 30 35.847574776   10.02 9.34     KIIvw 239 0
15 HD 187861 SB* 19 56 26.9442832128 -65 22 08.014212084   10.42 9.18     CEMP-rs 70 0
16 BPS CS 22964-0214 Pe* 20 05 49.9993957632 -39 27 43.358717988   14.06 13.66     CEMP-no 26 0
17 BPS CS 22873-0139 SB* 20 05 55.1466054456 -59 17 11.461854084     13.8 13.810   ~ 36 0
18 2MASS J20353125-1553306 Pe* 20 35 31.2592395984 -15 53 30.715762344   14.45 14.0     ~ 17 0
19 BPS CS 22880-0013 Pe* 20 37 28.1703712680 -20 14 34.640839536   14.07 13.7 13.71   ~ 10 0
20 HD 196944 SB* 20 40 46.0815001992 -06 47 50.604476604   9.01 8.40 8.08   CEMP-rs 117 0
21 BPS CS 22880-0074 Pe* 20 46 03.2162534976 -20 59 14.110203840   13.84 13.27 12.770 12.382 CEMP-s 49 0
22 BPS CS 22898-0027 Pe* 21 05 45.0996805992 -18 36 57.501493128   13.26 12.76 12.476 12.094 CEMP-r/s 88 0
23 BPS CS 22956-0028 SB* 21 44 48.7055162280 -63 22 09.736708872   13.317 13.0     CEMP-s 31 0
24 BPS CS 22960-0058 HB* 22 16 05.8811224824 -42 26 42.797355576   13.91 13.50 13.57   A 8 0
25 BPS CS 22892-0052 Pe* 22 17 01.6558764360 -16 39 27.051026544   14.03 13.20 13.06 12.19 KIIvw 472 0
26 BPS CS 22941-0012 Pe* 23 28 29.7281745624 -32 48 46.507711140   12.75 12.45     ~ 16 0
27 BPS CS 22941-0005 SB* 23 29 52.8373943808 -35 13 03.812271564   14.88 14.61     ~ 10 0
28 V* BY Scl SX* 23 51 32.2401548712 -25 45 46.662051420   14.05 13.85     A0 20 0

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