| discov_num |
notes |
refcode |
| MCA 18 |
eta Ori = 28 Ori. Quintuple; primary is a double-lined spectroscopic |
|
|
triple with periods 7.99 d (Aa1,Aa2) and 9.2 yr (Aa,Ab). The close |
|
|
pair eclipses, and shows an 8-hour pulsation in one of the components. |
|
|
Aa is also eclipsing binary (period 7.9904 day). |
Zas2010 |
|
Aa,Ab. McAlister (1976) orbit uses the elements P, T, e, and the |
McA1976 |
|
longitude of periastron for the 9-year orbit, from a spectroscopic |
|
|
orbit by Ziska & Beardsley (1981), and assumes the orbit is edge-on; |
Bey1981 |
|
semi-major axis and node are based on a single speckle observation. |
|
|
The ascending node has been reversed. |
|
|
The visual companions are star B (mag. 4.8, 1.5") in slow retrograde |
|
|
motion, and C (mag. 9.4, 115"). |
|
|
See Baize & Petit (1989) catalog of doubles with variable component. |
Baz1989d |
|
1985.8542: This measurement of the Aab,c component of eta Ori, |
|
|
overlooked in the original analysis of this run, was discovered during |
|
|
preparation of a paper on absolute quadrant determinations by Bagnuolo |
Bgn1992 |
|
et al. (1992) |
Hrt1992b |
|
Aa,Ab: Malkov et al. (2012) derive dynamical, photometric, and |
|
|
spectroscopic masses 25.82 +/- 24.95, 24.50, 22.65 Msun, respectively. |
Mlk2012 |
| DA 5 |
AB: Rectilinear solution by Hartkopf et al. (2012). |
Hrt2012a |
| MCA 18 |
Aa,Ab has an SB1 orbit with P=9.44yr. The orbit given here uses only |
|
|
the speckle data, however. |
Tok2015c |
| H 6 67 |
H VI 67. |
|
| refcode |
metd |
author |
reference |
| Baz1989d |
- |
Baize, P. & Petit, M. |
1989A&AS...77..497B |
| Baz1989d |
|
A&AS 77, 497, 1989 |
|
| Bey1981 |
- |
Ziska, E.R. & Beardsley, W.R. |
1981AJ.....86.1944Z |
| Bey1981 |
|
AJ 86, 1944, 1981 |
|
| Bgn1992 |
orb - |
Bagnuolo, W.G., Mason, B.D., Barry, D., Hartkopf, W., & McAlister, H.A. |
1992AJ....103.1399B |
| Bgn1992 |
|
AJ 103, 1399, 1992 |
|
| Hrt1992b |
Sc j |
Hartkopf, W.I., McAlister, H.A., & Franz, O.G. |
1992AJ....104..810H |
| Hrt1992b |
|
AJ 104, 810, 1992 |
|
| Hrt2012a |
orb - |
Hartkopf, W.I., Tokovinin, A., & Mason, B.D. |
2012AJ....143...42H |
| Hrt2012a |
+lin |
AJ 143, 42, 2012 |
|
| McA1976 |
orb - |
McAlister, H.A. |
1976PASP...88..957M |
| McA1976 |
|
PASP 88, 957, 1976 |
|
| Mlk2012 |
not - |
Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. |
2012A&A...546A..69M |
| Mlk2012 |
|
A&A 546, A69, 2012 |
|
| Tok2015c |
orb+j |
Tokovinin, A., Mason, B.D., Hartkopf, W.I., Mendez, R.A., & Horch, E.P. |
2015AJ....150...50T |
| Tok2015c |
+St |
AJ 150, 50, 2015 (some measures corrected in Tok2017b) |
2017AJ....154..110T |
| Zas2010 |
- |
Zasche, P. |
................... |
| Zas2010 |
|
private communication, 2010 |
|
