Basic data (System:593)

C1900.0 :09562+1754
C2000.0 :100140427+17243270
Comp. :
Magn. : 9.76(V) ; 10.2
Spect. :K0n ; M3


Identifiers:

BD +18 2307GAIADR2 623076270045202048GAIADR3 623076270045202048GCVS XY Leo
HIP 49136


Orbit

ElementValueStd. dev.
Period (d.):0.2841
T0 (xJD-2,400,000.0):45453.7599
Reference T0/epoch:JD
Eccentricity:0.0
omega primary (deg.):0.0
K1 (km/s):124.1
K2 (km/s):204.7
V0 (km/s):-51.8
sigma residuals primary:
sigma residuals secondary:
#RV primary:
#RV secondary:
Grade:3.0
Contributor:DAO
Status:PUB
Bibcode:1987ApJ...317..333B
Derived quantities (on the fly, from the above quantities)
a1sini (km):4848160
a2sini (km):7996930
m1sin**3 i (sol.mass):0.6539060
m2sin**3 i (sol.mass):0.3964320

Note

Two recent studies supersede that by O. Struve and V. Zebergs (Astrophys. J.,
130, 137, 1959). The other is by B.J. Hrivnak et al. (Astrophys. J., 285, 683,
1984). This and Barden's study are of similar quality. The sums of K1 and K2
from the two investigations are nearly similar, but the mass-ratio is
different, and the work of Hrivnak et al. may have been affected by the lines
of the spectra of the companion (see note XY Leo B). The epoch is T0 and the
orbit was assumed circular. The minimum magnitude given is an estimate based on
the eclipse depth. Four recent photometric analyses (B. Hrivnak, Astrophys. J.,
290, 696, 1985, J. Kaluzny and G. Pojmanski, Acta Astron., 33, 277, 1983, R.W.
Hilditch, Mon. Not. Roy. Astron. Soc., 196, 305, 1981 and R.H. Koch and C.R.
Shanus, Astron. J., 83, 1452, 1978) agree on an orbital inclination around 67
deg. The last named also give Delta V=0.2m. All these results, however, were
obtained before the discovery of the companion which is the subject of the next
note. Spectral types assigned to this system and the next must necessarily be
imprecise. The system is an X-ray source (R.G. Cruddace and A.K. Dupree,
Astrophys. J., 277, 263, 1984).

Plot

Orbit
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T. Merle

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