Basic data (System:981)
| C1900.0 | : | 17375+6848
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| C2000.0 | : | 173657092+68452869
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| Comp. | : | A
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| Magn. | : | 4.80(V)
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| Spect. | : | F5V
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Identifiers:
| Bayer $\omega$ Dra | BD +68 949 | GAIADR2 1637717179389828224 | GAIADR3 1637717179389828224
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| GJ 4017 | HD 160922 | HIP 86201 | HR 6596
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Orbit
| Element | | Value | Std. dev.
|
|---|
| Period (d.) | : | 5.2798088 | 0.0000083
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| Periastron time (xJD-2,400,000.0) | : | 53980.1606 | 0.0006
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| Reference T0/epoch | : | JD
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| Eccentricity | : | 0.0 | Fixed
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| omega primary (deg.) | : | 0.0 | Fixed
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| K1 (km/s) | : | 36.326 | 0.029
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| K2 (km/s) | : | 44.699 | 0.039
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| V0 (km/s) | : | -13.975 | 0.018
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| sigma residuals primary | : |
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| sigma residuals secondary | : |
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| #RV primary | : | 82
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| #RV secondary | : | 82
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| Grade | : |
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| Contributor | : |
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| Status | : | PUB
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| Bibcode | : | 2009AJ....137.3900F
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| Derived quantities (on the fly, from the above quantities) |
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| a1sini (km) | : | 2.63736e+06 | 2100
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| a2sini (km) | : | 3.24526e+06 | 2800
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| m1sin**3 i (sol.mass) | : | 0.161145 | 0.00032
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| m2sin**3 i (sol.mass) | : | 0.130959 | 0.00023
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Note
Given the extremely small eccentricity found for the
eccentric-orbit solution, a circular-orbit solution was adopted.
Thus, the value of T is NOT a time of periastron passage but
rather is T_0, a time of maximum positive velocity.
Fekel et al. find that the primary is an Am star, but the A9
secondary has normal abundances. The primary is synchronously
rotating, while the secondary is possibly also synchronously
rotating.
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) |
|
| 53171.810 | 15.1 | 0.0 | 0.8 | a | 0 |
|
| 53172.870 | 15.9 | 0.3 | 0.8 | a | 0 |
|
| 53260.722 | -14.7 | 2.1 | 0.0 | a | 0 |
|
| 53273.627 | 1.2 | 0.1 | 0.8 | a | 0 |
|
| 53275.636 | -47.3 | 0.2 | 0.8 | a | 0 |
|
| 53277.697 | 20.6 | -0.2 | 1.0 | a | 0 |
|
| 53433.922 | -49.0 | 0.0 | 1.0 | a | 0 |
|
| 53446.978 | 22.1 | -0.1 | 1.0 | a | 0 |
|
| 53466.008 | -40.6 | 0.0 | 1.0 | a | 0 |
|
| 53468.791 | 7.8 | -0.3 | 1.0 | a | 0 |
|
| 53483.822 | 22.3 | 0.0 | 1.0 | a | 0 |
|
| 53487.931 | -8.9 | 0.2 | 0.8 | a | 0 |
|
| 53488.939 | 21.4 | 0.1 | 0.8 | a | 0 |
|
| 53490.893 | -31.6 | 0.3 | 0.8 | a | 0 |
|
| 53491.885 | -50.0 | 0.0 | 0.8 | a | 0 |
|
| 53499.964 | 20.6 | 0.1 | 1.0 | a | 0 |
|
| 53512.790 | -49.9 | 0.1 | 1.0 | a | 0 |
|
| 53526.641 | 14.8 | -0.2 | 1.0 | a | 0 |
|
| 53530.855 | 15.3 | -0.3 | 1.0 | a | 0 |
|
| 53533.798 | -49.3 | -0.2 | 0.8 | a | 0 |
|
| 53534.798 | -36.1 | -0.4 | 0.8 | a | 0 |
|
| 53536.808 | 21.8 | 0.0 | 0.8 | a | 0 |
|
| 53547.829 | 13.0 | -0.1 | 1.0 | a | 0 |
|
| 53551.968 | 15.0 | -0.4 | 1.0 | a | 0 |
|
| 53563.942 | 3.7 | -0.3 | 1.0 | a | 0 |
|
| 53564.889 | -35.3 | -0.5 | 1.0 | a | 0 |
|
| 53610.631 | 22.4 | 0.1 | 1.0 | a | 0 |
|
| 53626.676 | 20.5 | -0.1 | 1.0 | a | 0 |
|
| 53630.803 | 3.9 | 0.1 | 1.0 | a | 0 |
|
| 53639.710 | -50.0 | 0.1 | 1.0 | a | 0 |
|
| 53643.735 | -21.0 | -0.1 | 1.0 | a | 0 |
|
| 53657.644 | 17.0 | -0.3 | 1.0 | a | 0 |
|
| 53670.690 | -41.5 | -0.1 | 1.0 | a | 0 |
|
| 53671.784 | -44.4 | -0.2 | 1.0 | a | 0 |
|
| 53675.821 | -37.0 | -0.3 | 1.0 | a | 0 |
|
| 53688.652 | -5.6 | -0.2 | 1.0 | a | 0 |
|
| 53691.709 | -38.5 | -0.2 | 1.0 | a | 0 |
|
| 53725.645 | -4.0 | -0.1 | 1.0 | a | 0 |
|
| 53740.663 | -37.1 | 0.2 | 1.0 | a | 0 |
|
| 53754.035 | 3.1 | -0.1 | 1.0 | a | 0 |
|
| 53768.987 | 22.4 | 0.1 | 1.0 | a | 0 |
|
| 53798.877 | -32.5 | 0.0 | 1.0 | a | 0 |
|
| 53813.842 | -50.5 | -0.2 | 1.0 | a | 0 |
|
| 53836.787 | 6.2 | -0.2 | 1.0 | a | 0 |
|
| 53849.837 | -28.9 | -0.2 | 1.0 | a | 0 |
|
| 53852.895 | 14.7 | -0.1 | 0.8 | a | 0 |
|
| 53855.894 | -49.3 | 0.1 | 0.8 | a | 0 |
|
| 53856.778 | -38.9 | -0.3 | 1.0 | a | 0 |
|
| 53865.779 | -32.8 | -0.1 | 1.0 | a | 0 |
|
| 53869.742 | 17.2 | 0.1 | 1.0 | a | 0 |
|
| 53879.971 | 22.2 | 0.3 | 1.0 | a | 0 |
|
| 53882.979 | -44.2 | 0.0 | 1.0 | a | 0 |
|
| 53895.962 | 20.7 | 0.3 | 1.0 | a | 0 |
|
| 53903.957 | -47.2 | -0.1 | 1.0 | a | 0 |
|
| 53922.847 | 8.2 | -0.1 | 1.0 | a | 0 |
|
| 53938.872 | 1.3 | -0.2 | 1.0 | a | 0 |
|
| 53996.707 | 10.2 | 0.0 | 1.0 | a | 0 |
|
| 54000.823 | 17.0 | -0.1 | 1.0 | a | 0 |
|
| 54001.627 | 19.6 | 0.3 | 0.8 | a | 0 |
|
| 54006.633 | 22.4 | 0.2 | 0.8 | a | 0 |
|
| 54013.642 | -33.9 | -0.2 | 1.0 | a | 0 |
|
| 54016.668 | 17.1 | -0.1 | 1.0 | a | 0 |
|
| 54029.736 | -42.2 | -0.3 | 1.0 | a | 0 |
|
| 54057.668 | -29.6 | -0.2 | 1.0 | a | 0 |
|
| 54074.729 | 16.6 | -0.3 | 1.0 | a | 0 |
|
| 54093.622 | -50.3 | -0.1 | 1.0 | a | 0 |
|
| 54110.025 | -43.6 | 0.2 | 1.0 | a | 0 |
|
| 54126.891 | -4.6 | 0.2 | 1.0 | a | 0 |
|
| 54220.930 | -43.1 | 0.0 | 0.8 | a | 0 |
|
| 54221.940 | -4.8 | -0.6 | 0.8 | a | 0 |
|
| 54269.793 | 8.5 | -0.1 | 0.8 | a | 0 |
|
| 54367.621 | -41.0 | 0.3 | 0.8 | a | 0 |
|
| 54584.012 | -38.6 | 0.2 | 0.8 | a | 0 |
|
| 54586.834 | 16.2 | 0.2 | 0.8 | a | 0 |
|
| 54729.701 | 21.5 | 0.1 | 0.8 | a | 0 |
|
| 54732.638 | -49.9 | 0.1 | 0.8 | a | 0 |
|
| 54768.729 | -36.4 | -0.1 | 1.0 | a | 0 |
|
| 54771.709 | 18.0 | 0.2 | 1.0 | a | 0 |
|
| 54783.591 | 3.2 | -0.3 | 1.0 | a | 0 |
|
| 54785.594 | -48.5 | 0.0 | 1.0 | a | 0 |
|
| 54790.596 | -50.3 | 0.0 | 1.0 | a | 0 |
|
| 54791.596 | -28.1 | 0.0 | 1.0 | a | 0 |
|
| 53171.810 | -49.8 | 0.0 | 0.3 | b | 0 |
|
| 53172.870 | -49.7 | 0.7 | 0.3 | b | 0 |
|
| 53260.722 | -14.7 | -4.2 | 0.0 | b | 0 |
|
| 53273.627 | -31.4 | 1.1 | 0.3 | b | 0 |
|
| 53275.636 | 27.3 | 0.0 | 0.3 | b | 0 |
|
| 53277.697 | -56.9 | -0.2 | 0.6 | b | 0 |
|
| 53433.922 | 29.3 | 0.1 | 0.6 | b | 0 |
|
| 53446.978 | -58.4 | 0.1 | 0.6 | b | 0 |
|
| 53466.008 | 19.0 | 0.2 | 0.6 | b | 0 |
|
| 53468.791 | -41.2 | -0.1 | 0.6 | b | 0 |
|
| 53483.822 | -58.2 | 0.4 | 0.6 | b | 0 |
|
| 53487.931 | -19.7 | 0.2 | 0.3 | b | 0 |
|
| 53488.939 | -57.3 | 0.1 | 0.3 | b | 0 |
|
| 53490.893 | 7.9 | -0.2 | 0.3 | b | 0 |
|
| 53491.885 | 30.4 | 0.0 | 0.3 | b | 0 |
|
| 53499.964 | -56.3 | 0.2 | 0.6 | b | 0 |
|
| 53512.790 | 30.6 | 0.2 | 0.6 | b | 0 |
|
| 53526.641 | -49.6 | 0.0 | 0.6 | b | 0 |
|
| 53530.855 | -50.4 | -0.1 | 0.6 | b | 0 |
|
| 53533.798 | 28.8 | -0.4 | 0.3 | b | 0 |
|
| 53534.798 | 12.7 | -0.1 | 0.3 | b | 0 |
|
| 53536.808 | -57.6 | 0.4 | 0.3 | b | 0 |
|
| 53547.829 | -47.4 | -0.1 | 0.6 | b | 0 |
|
| 53551.968 | -50.2 | -0.1 | 0.6 | b | 0 |
|
| 53563.942 | -36.1 | -0.1 | 0.6 | b | 0 |
|
| 53564.889 | 11.2 | -0.5 | 0.6 | b | 0 |
|
| 53610.631 | -58.6 | 0.0 | 0.6 | b | 0 |
|
| 53626.676 | -56.4 | 0.1 | 0.6 | b | 0 |
|
| 53630.803 | -36.1 | -0.3 | 0.6 | b | 0 |
|
| 53639.710 | 30.7 | 0.3 | 0.6 | b | 0 |
|
| 53643.735 | -6.0 | -0.6 | 0.6 | b | 0 |
|
| 53657.644 | -52.5 | 0.0 | 0.6 | b | 0 |
|
| 53670.690 | 19.9 | 0.2 | 0.6 | b | 0 |
|
| 53671.784 | 23.5 | 0.2 | 0.6 | b | 0 |
|
| 53675.821 | 14.7 | 0.7 | 0.6 | b | 0 |
|
| 53688.652 | -24.4 | 0.2 | 0.6 | b | 0 |
|
| 53691.709 | 16.3 | 0.3 | 0.6 | b | 0 |
|
| 53725.645 | -26.0 | 0.3 | 0.6 | b | 0 |
|
| 53740.663 | 15.1 | 0.4 | 0.6 | b | 0 |
|
| 53754.035 | -35.1 | 0.0 | 0.6 | b | 0 |
|
| 53768.987 | -58.7 | 0.0 | 0.6 | b | 0 |
|
| 53798.877 | 8.9 | 0.1 | 0.6 | b | 0 |
|
| 53813.842 | 30.9 | 0.2 | 0.6 | b | 0 |
|
| 53836.787 | -39.1 | 0.0 | 0.6 | b | 0 |
|
| 53849.837 | 4.4 | 0.2 | 0.6 | b | 0 |
|
| 53852.895 | -49.4 | 0.0 | 0.3 | b | 0 |
|
| 53855.894 | 29.5 | -0.1 | 0.3 | b | 0 |
|
| 53856.778 | 16.5 | 0.1 | 0.6 | b | 0 |
|
| 53865.779 | 9.3 | 0.3 | 0.6 | b | 0 |
|
| 53869.742 | -51.9 | 0.3 | 0.6 | b | 0 |
|
| 53879.971 | -58.1 | 0.1 | 0.6 | b | 0 |
|
| 53882.979 | 23.6 | 0.4 | 0.6 | b | 0 |
|
| 53895.962 | -56.1 | 0.1 | 0.6 | b | 0 |
|
| 53903.957 | 26.7 | -0.1 | 0.6 | b | 0 |
|
| 53922.847 | -41.3 | 0.1 | 0.6 | b | 0 |
|
| 53938.872 | -33.1 | -0.1 | 0.6 | b | 0 |
|
| 53996.707 | -43.8 | 0.0 | 0.6 | b | 0 |
|
| 54000.823 | -51.9 | 0.3 | 0.6 | b | 0 |
|
| 54001.627 | -54.3 | 0.6 | 0.3 | b | 0 |
|
| 54006.633 | -58.1 | 0.4 | 0.3 | b | 0 |
|
| 54013.642 | 10.4 | 0.1 | 0.6 | b | 0 |
|
| 54016.668 | -52.2 | 0.2 | 0.6 | b | 0 |
|
| 54029.736 | 20.4 | 0.0 | 0.6 | b | 0 |
|
| 54057.668 | 5.5 | 0.4 | 0.6 | b | 0 |
|
| 54074.729 | -52.1 | -0.2 | 0.6 | b | 0 |
|
| 54093.622 | 30.6 | 0.0 | 0.6 | b | 0 |
|
| 54110.025 | 22.6 | -0.2 | 0.6 | b | 0 |
|
| 54126.891 | -25.1 | 0.2 | 0.6 | b | 0 |
|
| 54220.930 | 21.9 | 0.0 | 0.3 | b | 0 |
|
| 54221.940 | -26.1 | -0.1 | 0.3 | b | 0 |
|
| 54269.793 | -42.3 | -0.6 | 0.3 | b | 0 |
|
| 54367.621 | 20.1 | 0.5 | 0.3 | b | 0 |
|
| 54584.012 | 16.9 | 0.3 | 0.3 | b | 0 |
|
| 54586.834 | -50.8 | 0.1 | 0.3 | b | 0 |
|
| 54729.701 | -57.0 | 0.5 | 0.3 | b | 0 |
|
| 54732.638 | 29.7 | -0.7 | 0.3 | b | 0 |
|
| 54768.729 | 13.5 | 0.0 | 0.6 | b | 0 |
|
| 54771.709 | -53.2 | -0.1 | 0.6 | b | 0 |
|
| 54783.591 | -35.4 | 0.0 | 0.6 | b | 0 |
|
| 54785.594 | 28.8 | 0.2 | 0.6 | b | 0 |
|
| 54790.596 | 30.8 | 0.1 | 0.6 | b | 0 |
|
| 54791.596 | 3.5 | 0.1 | 0.6 | b | 0 |
|
Plot
Encapsulated PostScript file
T. Merle
