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Details for Revision 3
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Name
  del Ori  
AAVSO UID
000-BCW-648 (3862 observations)  
Constellation
Orion Sequence
J2000.0
05 32 00.40 -00 17 56.7  (83.00167 -0.29908) Search nearby
B1950.0 05 29 27.04 -00 20 04.4
Galactic coord. 203.856 -17.740
Other names

(Internal only)
34 Ori A del Ori A 1RXS J053200.8-001755
AAVSO 0526-00B ADS 4134 A ALS 14779
BD-00 983 HD 36486 HIP 25930
HR 1851 HR 1852 IRC +00076
SAO 132220 X 05294-003  
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Variability type
EA
Spectral type O9.5II+B0.5III
Mag. range
2.20 - 2.32 V
Discoverer --
Epoch
07 Oct 1990 (HJD 2448172.066) Ephemeris
Outburst --
Period 5.73249 d
Rise/eclipse dur. 13%  (17.9 h)
Remarks
Some references may be clicked to view in new window. Roll over index number to view submission details.
1 Otero, Sebastian Alberto Range is for the combined brightness of the eclipsing binary (Aa1-Aa2) and the tertiary companion Ab 0".27 away (V= 3.83; B0IV; Aa-Ab period 152 y). C companion (V= 6.84) is 52" away and is also a binary (CaCb, B3V+A0V) with P= 29.96 d. B is a faint K dwarf (V= 13.2; sep. 33") unrelated to the system. Eccentric system with apsidal motion (P= 201 years) probably caused by the tertiary component. Min II V= 2.27 at phase 0.45. Elements given are for Min I. Elements for Min II= HJD 2448742.21 + 5.73240 x E. Sidereal period 5.732436 d. HB amplitude 0.02. Several additional frequencies detected, with main periods 4.572 d (rotation of Aa1?), 2.522 d (pulsation?), 2.090 d (rotation of Ab?) and 1.075 d (pulsation?). Pulsations may be BCEP and SPB and come from either the primary (Aa1), or the tertiary (Ab) (2023A&A...672A..31O). Also likely tidally-induced pulsations (2015ApJ...809..134P).
2 GCVS Team VB A (A 0.217", 144deg, 1980; B 14.0m, 33.1", 227deg; C 6.84m, 53.5", 359deg). Orion Belt cluster member. Min II 2.20. Apsidal motion (P = 210 yr). Shape of the light curve varies. The intrinsic brightness variability of the components is possible.
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References
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1 Oplištilová, A.; Mayer, P.; Harmanec, P.; et al., 2023, Spectrum of the
secondary component and new orbital elements of the massive triple star
δ Ori A		 2023A&A...672A..31O
2 Pablo, H.; Richardson, N. D.; Moffat, A. F. J.; et al., 2015, A Coordinated
X-Ray and Optical Campaign of the Nearest Massive Eclipsing Binary, δ
Orionis Aa. III. Analysis of Optical Photometric (MOST) and Spectroscopic
(Ground-based) Variations		 2015ApJ...809..134P
3 Mayer, P., et al., 2010, Physical elements of the eclipsing binary δ
Orionis		 2010A&A...520A..89M
4 Mayer, P., et al., 2010, Physical elements of the eclipsing binary δ
Orionis		 2010A&A...520A..89M
5 R.H.Koch, B.J.Hrivnak, ApJ 248, 249, 1981. 1981ApJ...248..249K
6 W.H.Warren, Jr., J.E.Hesser, ApJ Suppl 34, 115, 1977. 1977ApJS...34..115W
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Supporting Documents
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1 Phase plot Otero, Sebastian Alberto 2012-12-04 04:12 UTC Phase plot combining data published in 2010A&A...520A..89M.
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Revision History
Currently approved revision is checked. Click revision number to view details of that revision.
4 Otero, Sebastian Alberto 2026-06-22 07:07 UTC Type and specytral type from 2023A&A...672A..31O and 2015ApJ...809..134P.
3 Otero, Sebastian Alberto 2012-12-04 04:12 UTC Elements from all data published in 2010A&A...520A..89M. Range from Hipparcos, GCPD and data in 2010A&A...520A..89M.
2 Admin, VSX 2010-01-05 04:43 UTC Position updated from the GCVS version of November 2009.
1 Admin, VSX 2005-12-18 01:33 UTC Initial upload.

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