2005A&A...441..695T


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST02:20:01

2005A&A...441..695T - Astronomy and Astrophysics, volume 441, 695-699 (2005/10-2)

An old nearby quadruple system Gliese 225.2.

TOKOVININ A., KIYAEVA O., STERZIK M., ORLOV V., RUBINOV A. and ZHUCHKOV R.

Abstract (from CDS):

We discovered a new component E in the nearby multiple system Gliese 225.2, making it quadruple. We derive a preliminary 24-yr astrometric orbit of this new sub-system C,E and a slightly improved orbit of the 68-yr pair A,B. The orientations of the A,B and C,E orbits indicate that they may be close to coplanarity. The orbit of AB,CE is rather wide and does not allow to determine its curvature reliably. Thus, the 390yr orbit computed by Baize (1980, Inf. Circ. IAU Comm., 26(80)) was premature. The infrared colors and magnitudes of components A, B, and C match standard values for dwarfs of spectral types K5V, M0V, and K4V, respectively. The new component E, 3 magnitudes below the Main Sequence, has an anomalously blue color index. We estimate its mass as roughly 0.2 solar from the astrometric orbit, although there remains some inconsistency in the data hinting on a higher mass or on the existence of additional components in the system. Large space velocities indicate that Gliese 225.2 belongs to the thick Galactic disk and is not young. This quadruple system survived for a long time and should be dynamically stable.

Abstract Copyright:

Journal keyword(s): stars: binaries: visual - stars: individual: HD 40887

Simbad objects: 8

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Number of rows : 8

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 NAME HD 40887 AB ** 06 00 19.3285225163 -31 01 49.970863083   10.33 8.90     K5V 12 0
2 HD 40887C ** 06 00 19.3760855358 -31 01 48.094832509   10.21 8.88     K5V 17 0
3 HD 40887 ** 06 00 19.52451 -31 01 43.6103 9.993 9.013 7.873 7.163 6.526 K5V+K5V 66 0
4 HD 155876 SB* 17 12 07.91174 +45 39 57.2157   10.250 9.523 9.3   M3V 198 0
5 * 29 Aqr Al* 22 02 26.2484485366 -16 57 53.395848800   6.6 6.5     A2V+G0II 73 0
6 HD 239960 ** 22 27 59.47299 +57 41 45.2325           M3 260 0
7 HD 239960B Er* 22 27 59.7956021455 +57 41 49.746752678           M4V 164 0
8 * tet Phe ** 23 39 27.94416 -46 38 16.0796   6.33 6.09     A7III+A/F 25 0

    Equat.    Gal    SGal    Ecl

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2020.08.14-02:20:01

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