2013A&A...558A..36C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST13:47:14

2013A&A...558A..36C - Astronomy and Astrophysics, volume 558A, 36-36 (2013/10-1)

The Hamburg/ESO R-process Enhanced Star survey (HERES). VIII. The r+s star He 1405-0822.

CUI W.Y., SIVARANI T. and CHRISTLIEB N.

Abstract (from CDS):

The aim of this study is a detailed abundance analysis of the newly discovered r-rich star HE 1405-0822, which has [Fe/H]=-2.40. This star shows enhancements of both r- and s-elements, [Ba/Fe]=+1.95 and [Eu/Fe]=1.54, for which reason it is called r+s star. Stellar parameters and element abundances were determined by analyzing high-quality VLT/UVES spectra. We used FeI line excitation equilibria to derive the effective temperature. The surface gravity was calculated from the FeI/FeII and TiI/TiII equilibria. We determined accurate abundances for 39 elements, including 19 neutron-capture elements. HE 1405-0822 is a red giant. Its strong enhancements of C, N, and s-elements are the consequence of enrichment by a former AGB companion with an initial mass of less than 3M. The heavy n-capture element abundances (including Eu, Yb, and Hf) seen in HE 1405-0822 do not agree with the r-process pattern seen in strongly r-process-enhanced stars. We discuss possible enrichment scenarios for this star. The enhanced α elements can be explained as the result of enrichment by supernovae of type II. Na and Mg may have partly been synthesized in a former AGB companion, when the primary 22Ne acted as a neutron poison in the 13C-pocket.

Abstract Copyright:

Journal keyword(s): stars: abundances - stars: AGB and post-AGB - stars: atmospheres - stars: chemically peculiar

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 224959 Pe* 00 02 08.0224361239 -02 49 12.239963584   10.6 9.55     C1,1_CH4 85 0
2 SB 960 Pe* 00 44 03.5698517387 -13 55 26.270588506   12.69 12.15 11.806 11.483 CEMP-s 102 0
3 BPS CS 22953-0003 Pe* 01 02 15.8722809261 -61 43 45.836705614   14.43 13.75 13.339 12.886 KIIvw 54 0
4 BPS CS 31082-0001 Pe* 01 29 31.1311330115 -16 00 45.496485322 12.527 12.427 11.642 11.189 10.713 CEMP 243 0
5 BPS CS 31079-0028 Pe* 03 01 00.6865351278 +06 16 31.807691514   13.900 13.211 12.713 12.190 ~ 23 0
6 HE 0338-3945 Pe* 03 39 55.0065616032 -39 35 42.904334997   15.753 15.333 15.098 14.787 CEMP-r/s 34 0
7 HD 88609 Pe* 10 14 28.9854651931 +53 33 39.345145786 9.930 9.540 8.620 7.78 7.15 G5IIIw 186 0
8 HE 1219-0312 Pe* 12 21 34.1430157283 -03 28 39.635608057     15.940   15.043 ~ 31 0
9 HD 115444 Pe* 13 16 42.4591800169 +36 22 52.695481224   9.77 8.97 8.3 7.88 G9V 224 0
10 HD 122563 Pe* 14 02 31.8456299772 +09 41 09.942736952 7.47 7.10 6.19 5.37 4.79 G8:III:Fe-5 746 0
11 EPIC 212685903 Pe* 14 07 42.9726133297 -08 36 14.381851613   14.770 13.998 13.591 13.171 CEMP-s 11 0
12 HE 1523-0901 Pe* 15 26 01.0697794752 -09 11 38.882076152   12.37 11.50 10.476 9.863 CEMP 61 0
13 LP 625-44 Pe* 16 43 14.0364804654 -01 55 30.408914037   12.84 11.68     CEMP-s 101 0
14 BD+17 3248 HB* 17 28 14.4691668039 +17 30 35.848406966   10.02 9.34     KIIvw 199 0
15 NGC 6522 GlC 18 03 34.08 -30 02 02.3   10.68 9.48     ~ 455 1
16 HD 187861 Pe* 19 56 26.9429735087 -65 22 08.017100343   10.42 9.18     C1,1p_CH 54 0
17 HD 196944 Pe* 20 40 46.0790261041 -06 47 50.650812411   9.01 8.40 8.08   CEMP-s 86 0
18 BPS CS 22892-0052 Pe* 22 17 01.6558480594 -16 39 27.051900047   14.03 13.20 13.06 12.19 KIIvw 410 0
19 BPS CS 29491-0069 Pe* 22 31 02.1859200260 -32 38 36.527997357   13.72 13.09 12.654 12.175 ~ 25 0
20 HD 221170 Pe* 23 29 28.8087923676 +30 25 57.847432750 9.43 8.74 7.66     G2IV 263 0
21 HE 2327-5642 Pe* 23 30 37.0896402813 -56 26 14.384633079   14.590 13.881 13.425 12.948 ~ 27 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-13:47:14

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