2010A&A...520A..89M


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.17CET15:19:28

2010A&A...520A..89M - Astronomy and Astrophysics, volume 520, A89-89 (2010/9-2)

Physical elements of the eclipsing binary δ Orionis.

MAYER P., HARMANEC P., WOLF M., BOZIC H. and SLECHTA M.

Abstract (from CDS):

For years, δ Orionis was considered a normal binary with an O9.5II primary exhibiting apsidal-line advance. However, radial-velocity curves of both binary components have been derived from the IUE and optical spectra using the cross-correlation technique, and surprisingly low masses of 11.2 and 5.6M were found. We obtained new spectra in the red spectral region and new UBV photometry. Using all published photometry and radial velocities, we deduced more accurate orbital and apsidal line periods. The main result of this paper is to show that the observed line spectra of δ Orionis are composed of the lines of the O9.5II primary and a similarly hot tertiary, while the lines of a cooler B-type secondary are too faint to be detected in the available spectra. The character of the light curve (low-amplitude partial eclipses and a non-negligible scatter of the data) does not allow for a unique light-curve solution. Nevertheless, we show that the assumption of normal primary-component mass and radius corresponding to the O9.5II classification (25M, 16-17R) leads to consistent parameters for the system.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - stars: early-type - stars: fundamental parameters - stars: individual: δ Ori

VizieR on-line data: <Available at CDS (J/A+A/520/A89): table1a.dat table1g.dat tablea1.dat table2a.dat table24.dat table27.dat table28.dat table2e.dat>

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 900 2
2 HD 34078 Or* 05 16 18.1489437436 +34 18 44.347016027 5.48 6.18 5.96     O9.5V 515 1
3 * eta Ori Al* 05 24 28.61672 -02 23 49.7311 2.25 3.18 3.35 3.44 3.65 B1V+B2: 376 0
4 HD 35921 bL* 05 29 42.65002 +35 22 30.0896 6.23 6.96 6.85     O9II 227 0
5 * n01 Ori ** 05 31 14.53183 +03 17 31.6729 4.47 5.29 5.46 5.51 5.72 B3II/III 129 1
6 * del Ori Al* 05 32 00.40009 -00 17 56.7424 0.96 2.02 2.41 2.32 2.54 B0III+O9V 739 0
7 HD 36591 V* 05 32 41.3503640106 -01 35 30.577451332 4.240 5.150 5.340     B2II/III 224 1
8 HD 36840 * 05 34 29.2855861187 -00 00 44.449971958   7.237 6.251     G8II/III 10 0
9 HD 36898 * 05 34 56.4874082099 -00 07 22.320180342   7.058 7.151     B8II 44 0
10 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1433 1
11 NAME Ori Complex Cld 05 35.3 -05 23           ~ 317 0
12 * eps Ori s*b 05 36 12.81335 -01 12 06.9089 0.48 1.51 1.69 1.76 1.93 B0Ia 855 0
13 V* DW Car Al* 10 43 10.0816952047 -60 02 11.743736924 9.02 9.83 9.85 10.03 9.59 B1III 61 0
14 * del Cir SB* 15 16 56.8969460249 -60 57 26.100998940 4.11 5.03 5.09 6.68   O8V 146 0
15 HD 187399 SB* 19 48 41.8756793202 +29 24 08.403071025 6.92 7.38 7.12 6.82 6.66 B7Ia?e 99 0
16 V* V1765 Cyg bL* 19 48 50.5978949920 +33 26 14.220574360 5.99 6.578 6.463     B0.5II 136 0
17 * 14 Cep SB* 22 02 04.5726568485 +58 00 01.308560227 4.77 5.551 5.542     O9IV(n)var+B1:V: 238 0

    Equat.    Gal    SGal    Ecl

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2019.11.17-15:19:28

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