The chemical composition of HD 196944: a carbon and s-process rich, very metal-poor star

被引：0
|
作者：
Zacs, L
Nissen, PE
Schuster, WJ
机构：
[1] Ventspils Int Radio Astron Ctr, LV-1050 Riga, Latvia
[2] Aarhus Univ, Inst Phys & Astron, DK-8000 Aarhus C, Denmark
[3] Univ Nacl Autonoma Mexico, Observ Astron Nacl, Ensenada 22800, Baja California, Mexico
来源：
ASTRONOMY & ASTROPHYSICS | 1998年 / 337卷 / 01期
关键词：
stars : evolution; stars : abundances; stars : chemically peculiar; stars : AGB and post-AGB; stars : individual : HD 196944;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
An LTE abundance analysis of the post-AGE candidate star HD 196944 is presented based on high resolution, high S/N spectra. The radial velocity of HD 196944 is found to be -174 km s(-1) indicating that it belongs to the halo population. The spectroscopic analysis provides the atmospheric parameters T-eff = 5250 K, log g = 1.7 (cgs), xi(t) = 1.9 km s(-1) corresponding to those for G2-5 (bright) giants. A low iron abundance, [Fe/H] = -2.45, is derived confirming the old, low mass nature of the star. With [C/Fe] = +1.4 and a mean s-process overabundance of [s/Fe] = +1.1 the peculiar atmospheric composition of HD 196944 is confirmed. Possible evolutionary stages of HD 196944, that can explain its atmospheric parameters and composition, are discussed.
引用
收藏
页码：216 / 222
页数：7
相关论文
共 50 条
  • [21] S-process in low-mass extremely metal-poor stars
    Cruz, M. A.
    Serenelli, A.
    Weiss, A.
    ASSEMBLING THE PUZZLE OF THE MILKY WAY, 2012, 19
  • [22] R- and S-process signatures in metal-poor halo stars
    Cowan, JJ
    Sneden, C
    Truran, JW
    Burris, DL
    McWilliam, A
    Preston, GW
    NUCLEAR PHYSICS A, 1997, 621 (1-2) : C41 - C44
  • [23] Chemical composition of carbon-rich, very metal-poor subgiant LP 625-44 observed with the Subaru/HDS
    Aoki, W
    Ando, H
    Honda, S
    Iye, M
    Izumiura, H
    Kajino, T
    Kambe, E
    Kawanomoto, S
    Noguchi, K
    Okita, K
    Sadakane, K
    Sato, B
    Shelton, I
    Takada-Hidai, M
    Takeda, Y
    Watanabe, E
    Yoshida, M
    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 2002, 54 (03) : 427 - 449
  • [24] ON THE SPECTRUM OF EXTREMELY METAL-POOR STAR HD 52961
    Kipper, Tonu
    BALTIC ASTRONOMY, 2013, 22 (02) : 101 - 110
  • [25] CHEMICAL ANALYSIS OF A CARBON-ENHANCED VERY METAL-POOR STAR: CD-27 14351
    Karinkuzhi, Drisya
    Goswami, Aruna
    Masseron, Thomas
    ASTROPHYSICAL JOURNAL, 2017, 834 (01):
  • [26] The R-Process Alliance: Discovery of the First Metal-poor Star with a Combined r- and s-process Element Signature
    Gull, Maude
    Frebel, Anna
    Cain, Madelyn G.
    Placco, Vinicius M.
    Ji, Alexander P.
    Abate, Carlo
    Ezzeddine, Rana
    Karakas, Amanda I.
    Hansen, Terese T.
    Sakari, Charli
    Holmbeck, Erika M.
    Santucci, Rafael M.
    Casey, Andrew R.
    Beers, Timothy C.
    ASTROPHYSICAL JOURNAL, 2018, 862 (02):
  • [27] A search for s-process elements in extremely metal-poor halo planetary nebulae
    Otsuka, Masaaki
    Tajitsu, Akito
    Izumiura, Hideyuki
    Hyung, Siek
    CHEMICAL ABUNDANCES IN THE UNIVERSE: CONNECTING FIRST STARS TO PLANETS, 2010, (265): : 77 - +
  • [28] THE CHEMICAL COMPOSITIONS OF VERY METAL-POOR STARS HD 122563 AND HD 140283: A VIEW FROM THE INFRARED
    Afsar, Melike
    Sneden, Christopher
    Frebel, Anna
    Kim, Hwihyun
    Mace, Gregory N.
    Kaplan, Kyle F.
    Lee, Hye-In
    Oh, Heeyoung
    Oh, Jae Sok
    Pak, Soojong
    Park, Chan
    Pavel, Michael D.
    Yuk, In-Soo
    Jaffe, Daniel T.
    ASTROPHYSICAL JOURNAL, 2016, 819 (02):
  • [29] The s-Process Elemental Distribution in an s-Enhanced Extremely Metal-Poor Binary
    Peterson, R. C.
    WHY GALAXIES CARE ABOUT AGB STARS II: SHINING EXAMPLES AND COMMON INHABITANTS, 2011, 445 : 51 - 56
  • [30] Chemical abundances of very metal-poor stars
    Zhang, HW
    Zhao, G
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2005, 364 (02) : 712 - 724
12345