The cool companion of AA Doradus-Brown dwarf or late M star?

被引：10
|
作者：
Mueller, S. [1 ,2 ]
Geier, S. [1 ,2 ]
Heber, U. [1 ,2 ]
机构：
[1] Univ Erlangen Nurnberg, Dr Karl Remeis Observ, D-96049 Bamberg, Germany
[2] Univ Erlangen Nurnberg, ECAP, D-96049 Bamberg, Germany
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2010年 / 329卷 / 1-2期
关键词：
Stars: binaries: close; Binaries: eclipsing; Stars: atmospheres; Stars: individual: AA Dor; ECLIPSING BINARY-SYSTEM; SUBDWARF B-STARS; SDOB PRIMARY; SYNCHRONIZATION; SPECTROSCOPY; PARAMETERS; EVOLUTION; VELOCITY; DOR;
D O I：
10.1007/s10509-010-0302-5
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
AA Dor is one of only seven known eclipsing binaries consisting of a hot subdwarf star and a low-mass companion. Although AA Dor has been studied in many investigations, a controversy about the nature of its companion persists. Is it a brown dwarf or a low-mass main sequence star? We reanalyse high resolution spectra using metal enhanced LTE model atmospheres. The optical spectra are polluted by reflected light from the companion. Using spectra taken during secondary eclipse, we derive atmospheric parameters consistent with results from the light curve. For the first time we achieve a self-consistent solution that matches all available observations, i.e. the light and radial velocity curves, as well as the atmospheric parameters. The resulting masses M-1 = 0.510(-0.108)(+0.125) M-circle dot and M-2 = 0.085(-0.023)(+0.031) M-circle dot are consistent with the canonical mass of an sdB star and a low-mass main sequence star. However, a brown dwarf companion cannot be excluded.
引用
收藏
页码：101 / 105
页数：5
相关论文
共 50 条
  • [21] A probable close brown dwarf companion to GJ 1046 (M 2.5V)
    Kuerster, M.
    Endl, M.
    Reffert, S.
    ASTRONOMY & ASTROPHYSICS, 2008, 483 (03): : 869 - 874
  • [22] Discovery of a brown dwarf very close to the Sun: A methane-rich brown dwarf companion to the low-mass star SCR 1845-6357
    Biller, BA
    Kasper, M
    Close, LM
    Brandner, W
    Kellner, S
    ASTROPHYSICAL JOURNAL, 2006, 641 (02): : L141 - L144
  • [23] The VAST Survey - IV. A wide brown dwarf companion to the A3V star ζ Delphini
    De Rosa, R. J.
    Patience, J.
    Ward-Duong, K.
    Vigan, A.
    Marois, C.
    Song, I.
    Macintosh, B.
    Graham, J. R.
    Doyon, R.
    Bessell, M. S.
    Lai, O.
    McCarthy, D. W.
    Kulesa, C.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2014, 445 (04) : 3694 - 3705
  • [24] Spectrum and proper motion of a brown dwarf companion of the T Tauri star CoD-33°7795
    Neuhäuser, R
    Guenther, EW
    Petr, MG
    Brandner, W
    Huélamo, N
    Alves, J
    ASTRONOMY & ASTROPHYSICS, 2000, 360 (03): : L39 - L42
  • [25] MOA-2010-BLG-073L: AN M-DWARF WITH A SUBSTELLAR COMPANION AT THE PLANET/BROWN DWARF BOUNDARY
    Street, R. A.
    Choi, J. -Y.
    Tsapras, Y.
    Han, C.
    Furusawa, K.
    Hundertmark, M.
    Gould, A.
    Sumi, T.
    Bond, I. A.
    Wouters, D.
    Zellem, R.
    Udalski, A.
    Snodgrass, C.
    Horne, K.
    Dominik, M.
    Browne, P.
    Kains, N.
    Bramich, D. M.
    Bajek, D.
    Steele, I. A.
    Ipatov, S.
    Abe, F.
    Bennett, D. P.
    Botzler, C. S.
    Chote, P.
    Freeman, M.
    Fukui, A.
    Harris, P.
    Itow, Y.
    Ling, C. H.
    Masuda, K.
    Matsubara, Y.
    Miyake, N.
    Muraki, Y.
    Nagayama, T.
    Nishimaya, S.
    Ohnishi, K.
    Rattenbury, N.
    Saito, To.
    Sullivan, D. J.
    Suzuki, D.
    Sweatman, W. L.
    Tristram, P. J.
    Wada, K.
    Yock, P. C. M.
    Szymanski, M. K.
    Kubiak, M.
    Pietrzynski, G.
    Soszynski, I.
    Poleski, R.
    ASTROPHYSICAL JOURNAL, 2013, 763 (01):
  • [26] Activity in very cool stars: Magnetic dissipation in late M and L dwarf atmospheres
    Mohanty, S
    Basri, G
    Shu, F
    Allard, F
    Chabrier, G
    ASTROPHYSICAL JOURNAL, 2002, 571 (01): : 469 - 486
  • [27] AN M DWARF COMPANION TO AN F-TYPE STAR IN A YOUNG MAIN-SEQUENCE BINARY
    Eigmueller, Ph.
    Eisloeffel, J.
    Csizmadia, Sz.
    Lehmann, H.
    Erikson, A.
    Fridlund, M.
    Hartmann, M.
    Hatzes, A.
    Pasternacki, Th.
    Rauer, H.
    Tkachenko, A.
    Voss, H.
    ASTRONOMICAL JOURNAL, 2016, 151 (03):
  • [28] Discovery of a low-mass brown dwarf companion of the young nearby star G 196-3
    Rebolo, R
    Osorio, MRZ
    Madruga, S
    Béjar, VJS
    Arribas, S
    Licandro, J
    SCIENCE, 1998, 282 (5392) : 1309 - 1312
  • [29] Infrared spectroscopy of a brown dwarf companion candidate near the young star GSC 08047-00232 in horologium
    Neuhäuser, R. (rne@astro.uni-jena.de), 1600, EDP Sciences (420):
  • [30] Infrared spectroscopy of a brown dwarf companion candidate near the young star GSC 08047-00232 in Horologium
    Neuhäuser, R
    Guenther, EW
    ASTRONOMY & ASTROPHYSICS, 2004, 420 (02) : 647 - 653
12345