Theta 1 Orionis A

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Multiple star
Theta 1 Orionis A
Named stars of the trapezoid
Named stars of the trapezoid
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Orion
Right ascension 05 h 35 m 15.83 s
declination -05 ° 23 ′ 14.2 ″
Apparent brightness 6.73 (6.72 to 7.65) mag
Typing
B − V color index (+0.02) 
U − B color index (−0.88) 
R − I index (+0.21) 
Spectral class B0.5 V
Variable star type EA 
Astrometry
Radial velocity (28 ± 1) km / s
parallax (2.63 ± 0.10)  mas
distance (1240 ± 50)  ly
(380 ± 14)  pc
Visual absolute brightness M vis (−2.80 ± 0.23) mag
Proper movement 
Rec. Share: (4.81 ± 0.10)  mas / a
Dec. portion: (−2.53 ± 0.12)  mas / a
Physical Properties
Dimensions (14.0 ± 0.8)  M ☉
radius (4.5 ± 0.5)  R ☉
Luminosity

(15500 ± 2000)  L ☉

Effective temperature (30700 ± 300)  K.
Age <2.6 mill.  A
Other names
and catalog entries
Bayer name Theta 1 Orionis A
Flamsteed name 41 Orionis A
Bonn survey BD −5 ° 1315A
Bright Star Catalog HR 1893 [1]
Henry Draper Catalog HD 37020 [2]
Hipparcos catalog HIP 26220 [3]
Tycho catalog TYC 4774-953-1 [4]
2MASS catalog 2MASS J05351582-0523143 [5]
Other names V1016 Orionis

Theta 1 Orionis A ( θ 1 Orionis A , θ 1 Ori A , also 41 Ori A ) is a multiple star system and a member of the trapezoid in the Orion Nebula .

Theta 1 Orionis A1 is an algolstern with a companion at a distance of about 1 AU that causes a drop in brightness every 65 days. The companion is probably a T-Tauri star with about 2.6 solar masses. Another companion (Theta 1 Orionis A2) with about 4 solar masses is about 100 AU away, making the system a multiple star. This star has spectral class F and is still in the pre-main sequence phase. It orbits the other two stars about every 200 years.

Web links

Individual evidence

  1. ↑ a b c d e f tet01 Ori A. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed April 14, 2019 .
  2. ↑ a b c V1016 Ori. In: VSX. AAVSO , accessed April 14, 2019 .
  3. ↑ a b c d e f g María-Fernanda Nieva, Norbert Przybilla: Fundamental properties of nearby single early B-type stars . In: Astronomy & Astrophysics . 566, 2014, p. A7. arxiv : 1412.1418 . bibcode : 2014A & A ... 566A ... 7N . doi : 10.1051 / 0004-6361 / 201423373 .
  4. ↑ a b Marina Kounkel et al .: The Gould's Belt Distances Survey (GOBELINS) II. Distances and Structure toward the Orion Molecular Clouds . In: The Astrophysical Journal . 834, No. 2, 2017. arxiv : 1609.04041 . bibcode : 2017ApJ ... 834..142K . doi : 10.3847 / 1538-4357 / 834/2/142 .
  5. ↑ a b 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 .
  6. ^ R. Grellmann, T. Preibisch, T. Ratzka, S. Kraus, KG Helminiak, H. Zinnecker: The multiplicity of massive stars in the Orion Nebula Cluster as seen with long-baseline interferometry . In: Astronomy & Astrophysics . 550, 2013, p. A82. arxiv : 1301.3045 . bibcode : 2013A & A ... 550A..82G . doi : 10.1051 / 0004-6361 / 201220192 .