WDS 20433+5521 LLO 1

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WDS 20433+5521 LLO 1 : NOTES

discov_num	notes	refcode
LLO 1	GJ 802. Using dH and 2MASS H magnitude, plus a parallax of 64.5 +- 2
	mas, Lloyd et al. (2006) derive absolute H magnitudes of 8.11 +/- 0.07	Llo2006
	and 12.79 +/- 0.3 mag for the two components. They also derive an
	orbit using this resolved measure with STEPS astrometric observations.
	This orbit yields dynamical masses of 0.175 +/- 0.021 and 0.064 +/-
	0.032 Msun for A and B, respectively.
	Ireland et al. (2008) combine spectroscopic data with aperture-masking	Llo2008
	observations, plus earlier astrometry by Pravdo et al. (2005; measures	Prv2005
	extracted from their figures) for orbital solutions of this young
	triple. The inner Aa,Ab pair are equal-mass stars in an orbit of
	period 0.795 days and an inclination in the range 74-83deg, which may
	indicate coplanarity with the wider orbit. The total mass of the inner
	pair is 0.280 +/- 0.010 Msun, that of the B component is 0.063 +/-
	0.005 Msun. Absolute magnitudes are determined for all components in
	the J-, H-, and K-bands. Data are compared with evolutionary models.
	GJ 802. This is a well-studied close triple system (e.g. Ireland et	Ire2008
	al. 2008). It consists of a spectroscopic pair with a period of only
	19 h, and a brown dwarf at a separation of ∼90 mas. Both are too close
	to be resolved with AstraLux, and there are no other candidates in the
	field of view.	Jnn2014

REFERENCES

refcode	metd	author	reference
Ire2008	Sa j	Ireland, M.J., Kraus, A., Martinache, F. Lloyd, J.P., & Tuthill. P.G.	2008ApJ...678..463I
Ire2008		ApJ 678, 463, 2008
Jnn2014	A -	Janson, M., Bergfors, C., Brandner, W., Kudryavtseva, N., Hormuth, F.,	2014ApJ...789..102J
Jnn2014	+Cl	Hippler, S., & Henning, T.
Jnn2014		ApJ 789, 102, 2014
Llo2006	Am j	Lloyd, J.P., Martinache, F., Ireland, M.J., Monnier, J.D., Pravdo, S.H.,	2006ApJ...650L.131L
Llo2006	+orb	Shaklan, S.B., & Tuthill, P.G.
Llo2006		ApJ 650, L131, 2006
Prv2005	orb -	Pravdo, S.H., Shaklan, S.B., & Lloyd, J.	2005ApJ...630..528P
Prv2005	+A	ApJ 630, 528, 2005

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
20433+5521	LLO 1		2007	10	20	0.1	9.00	13.70		NO K	204319.41+552052.0

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