Basic data (System:718)

Identifiers:

Orbit

Note

Abstract:
Eta Virginis is a bright (V = 3.89) triple system of composite
spectral type A2IV that has been observed for over a dozen years with
both spectroscopy and speckle interferometry. Analysis of the speckle
observations results in a long period of 13.1 years. This period is
also detected in residuals from the spectroscopic observations of the
71.7919-day short-period orbit. Elements of the long-period orbit
were determined separately using the observations of both techniques.
The more accurate elements from the speckle solution have been assumed
in a simultaneous spectroscopic determination of the short- and
long-period orbital elements.  The magnitude difference of the speckle
components suggests that lines of the third star should be visible in
the spectrum.  In our blue and red spectra only the Mg II line at 4481
angstroms appears to show a third component, however, and it is a very
broad and weak feature.  The equatorial rotational velocities of the
short-period pair are quite low, about 8 km/s each.

Radial velocities used in this orbit

xJD	Rad.Vel.	O-C or error	Weight	Component	Offset	Comment
-2,400,000.0	(km/s)	(km/s)			(km/s)
17710.630	-29.2	0	1	a
17714.750	-35.7	0	1	a
17716.630	-35.8	0	1	a
17739.610	16.9	0	1	a
17989.880	-7.2	0	1	a
18021.810	11.7	0	1	a
18031.820	17.8	0	1	a
18052.620	7.4	0	1	a
18077.620	-34.0	0	1	a
18087.580	-5.1	0	1	a
18089.600	5.0	0	1	a
18103.610	19.0	0	1	a
18355.790	-25.4	0	1	a
18642.930	-22.6	0	1	a
18706.740	-4.2	0	1	a
18727.820	-20.6	0	1	a
18736.730	4.3	0	1	a
18753.790	19.2	0	1	a
18757.910	18.8	0	1	a
18759.790	19.0	0	1	a
18764.700	15.1	0	1	a
43670.605	19.2	0	1	a
43671.648	18.5	0	1	a
44040.616	8.3	0	1	a
44178.023	15.2	0	1	a
44356.834	-24.0	0	1	a
44357.699	-20.5	0	1	a
44738.743	19.5	0	1	a
44739.741	19.7	0	1	a
45074.843	-23.2	0	1	a
45075.799	-18.5	0	1	a
45076.769	-16.3	0	1	a
45078.808	-8.8	0	1	a
45723.009	-16.4	0	1	a
45784.822	-31.1	0	1	a
45814.672	19.3	0	1	a
45855.715	-31.5	0	1	a
46534.709	19.4	0	1	a
46583.740	-18.9	0	1	a
46586.716	-8.7	0	1	a
46866.883	-30.3	0	1	a
46867.790	-28.6	0	1	a
46868.780	-25.3	0	1	a
46970.723	19.5	0	1	a
46971.697	18.5	0	1	a
46972.719	17.2	0	1	a
46974.691	17.4	0	1	a
47151.035	-33.0	0	1	a
47152.040	-33.0	0	1	a
47153.077	-32.5	0	1	a
47244.857	16.1	0	1	a
47245.752	16.2	0	1	a
47246.903	18.2	0	1	a
47247.897	18.3	0	1	a
47248.900	18.8	0	1	a
47308.807	2.8	0	1	a
47309.833	5.3	0	1	a
47310.821	7.3	0	1	a
47312.819	10.9	0	1	a
47313.781	13.1	0	1	a
47555.984	11.7	0	1	a
47556.988	11.8	0	1	a
47623.768	16.1	0	1	a
47625.653	14.0	0	1	a
47626.832	13.4	0	1	a
47916.050	10.0	0	1	a
48004.756	-21.2	0	1	a
48007.781	-28.0	0	1	a
48056.645	14.6	0	1	a
48057.633	13.7	0	1	a
48345.794	12.1	0	1	a
17710.630	35.7	0	1	b
17714.750	49.5	0	1	b
17716.630	50.3	0	1	b
18077.620	43.2	0	1	b
18103.610	-27.9	0	1	b
18355.790	36.6	0	1	b
18757.910	-32.7	0	1	b
18759.790	-31.6	0	1	b
18764.700	-22.8	0	1	b
43670.605	-25.0	0	1	b
43671.648	-24.2	0	1	b
44040.616	-15.2	0	1	b
44178.023	-19.9	0	1	b
44356.834	29.8	0	1	b
44357.699	26.1	0	1	b
44738.743	-27.1	0	1	b
44739.741	-26.6	0	1	b
45074.843	30.7	0	1	b
45075.799	26.9	0	1	b
45723.009	21.2	0	1	b
45784.822	42.9	0	1	b
45814.672	-26.4	0	1	b
45855.715	42.3	0	1	b
46534.709	-27.2	0	1	b
46583.740	24.1	0	1	b
46586.716	11.9	0	1	b
46866.883	39.1	0	1	b
46867.790	35.6	0	1	b
46868.780	33.3	0	1	b
46970.723	-24.9	0	1	b
46971.697	-25.2	0	1	b
46972.719	-26.9	0	1	b
46974.691	-24.5	0	1	b
47151.035	44.2	0	1	b
47152.040	43.7	0	1	b
47153.077	41.5	0	1	b
47244.857	-20.9	0	1	b
47245.752	-21.9	0	1	b
47246.903	-22.6	0	1	b
47247.897	-23.8	0	1	b
47248.900	-25.5	0	1	b
47312.819	-15.8	0	1	b
47313.781	-15.3	0	1	b
47555.984	-16.0	0	1	b
47556.987	-14.4	0	1	b
47623.768	-21.5	0	1	b
47625.653	-19.6	0	1	b
47626.832	-18.4	0	1	b
47916.050	-14.9	0	1	b
48004.756	28.8	0	1	b
48007.781	38.2	0	1	b
48056.645	-19.2	0	1	b
48057.633	-17.3	0	1	b
48345.794	-16.2	0	1	b

Plot