Theta 1 Orionis B
Multiple star Theta 1 Orionis B |
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Named stars of the trapezoid | |||||||||||||||||
AladinLite | |||||||||||||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
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Constellation | Orion | ||||||||||||||||
Right ascension | 05 h 35 m 16.11 s | ||||||||||||||||
declination | -05 ° 23 ′ 6.9 ″ | ||||||||||||||||
Apparent brightness | 7.96 (7.9 to 8.65) mag | ||||||||||||||||
Typing | |||||||||||||||||
B − V color index | (+0.24) | ||||||||||||||||
U − B color index | (−0.49) | ||||||||||||||||
Spectral class | B1 V | ||||||||||||||||
Variable star type | EA | ||||||||||||||||
Astrometry | |||||||||||||||||
Radial velocity | (26 ± 1) km / s | ||||||||||||||||
Proper movement | |||||||||||||||||
Rec. Share: | (−0.9 ± 2.1) mas / a | ||||||||||||||||
Dec. portion: | (+0.1 ± 1.3) mas / a | ||||||||||||||||
Physical Properties | |||||||||||||||||
Dimensions | ( 7/4/3/1/2/4 to 6) M ☉ | ||||||||||||||||
Other names and catalog entries |
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Theta 1 Orionis B ( θ 1 Orionis B , θ 1 Ori B , also 41 Ori B ) is a multiple star system and a member of the trapezoid in the Orion Nebula .
Mini clusters
The Theta 1 Orionis B system probably consists of six or more stars, named B1 to B6, and possibly one more star. The stars seem to be gravitationally bound to each other, but it is believed that this system cannot be stable for a long time. Accordingly, it is expected that the lower-mass components will be thrown out of the system as runaway stars over time .
The masses of the components are very different. The combination of B1, B5 and B6 has the greatest mass with a total of around 14 solar masses . It has long been known that component B1 has a companion B5 only about 0.12 AU away, which makes it an algolstern . In 2018, however, GRAVITY was able to resolve another component B6 at a distance of 3 to 7 AU. The components B2 and B3 are about 50 AU apart (0.12 arc seconds ) and have 4 and 3 solar masses, respectively.
The centers of B1 / B5 / B6 and B2 / B3 are about 0.9 arc seconds apart. The lowest mass in the system seems to have the somewhat remote component B4 with only 1 solar mass. Accordingly, it is also expected that this component will be ejected from the system first.
component | Solar masses |
Spectral class |
Distance (AE) |
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B1 | 7.2 ± 0.2 | B1 V | - |
B2 | 4th | ? | 382 ± 6 |
B3 | 3 | ? | 49 ± 1 |
B4 | 1 | ? | 248 ± 4 |
B5 | 2 | ? | 0.120 ± 0.002 |
B6 | 4 to 6 | B. | 3.5 to 7.2 |
Web links
- Theta-1 Orionis by James B. Kaler.
Individual evidence
- ↑ a b c d e f tet01 Ori B. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed April 14, 2019 .
- ↑ a b V1016 Ori. In: VSX. AAVSO , accessed April 14, 2019 .
- ↑ a b c GRAVITY collaboration: Multiple star systems in the Orion nebula . In: Astronomy & Astrophysics . 620, 2018, p. A116. arxiv : 1809.10376 . bibcode : 2018A & A ... 620A.116G . doi : 10.1051 / 0004-6361 / 201833575 .
- ↑ a b LM Close, A. Puglisi, JR Males, C. Arcidiacono, A. Skemer, JC Guerra, L. Busoni, G. Brusa, E. Pinna, DL Miller, A. Riccardi, DW McCarthy, M. Xompero, C. Kulesa, F. Quiros-Pacheco, J. Argomedo, J. Brynnel, S. Esposito, F. Mannucci, K. Boutsia, L. Fini, DJ Thompson, JM Hill, CE Woodward, R. Briguglio, TJ Rodigas, R. Briguglio, P. Stefanini, G. Agapito, P. Hinz: High-resolution Images of Orbital Motion in the Orion Trapezium Cluster with the LBT AO System . In: The Astrophysical Journal . 749, No. 2, 2012, p. 180. arxiv : 1203.2638 . bibcode : 2012ApJ ... 749..180C . doi : 10.1088 / 0004-637X / 749/2/180 .
- ↑ a b Christine Allen, Rafael Costero, Miroslava Hernández: The Dynamical Future of the mini-cluster θ1 Ori B . In: The Astronomical Journal . 150, No. 6, 2015, p. 167. bibcode : 2015AJ .... 150..167A . doi : 10.1088 / 0004-6256 / 150/6/167 .