126 Tauri

126 Tauri

Observation data Epoch J2000        Equinox J2000
Constellation	Taurus
Right ascension	05h 41m 17.71768s [1]
Declination	+16° 32′ 02.9253″ [1]
Apparent magnitude  (V)	4.836 [2] (5.04 / 6.56) [3]
Characteristics
Spectral type	B3 IV [4]
U−B color index	−0.64 [5]
B−V color index	−0.12 [5]
Astrometry
Radial velocity (Rv)	+21.90±0.9 [6] km/s
Proper motion (μ)	RA: +3.50 [1] mas/yr Dec.: −15.47 [1] mas/yr
Parallax (π)	5.13±0.81  mas [1]
Distance	approx. 600  ly (approx. 190  pc)
Orbit [7] [3]
Primary	A
Companion	B
Period (P)	118±7 yr
Semi-major axis (a)	0.185±0.007″
Eccentricity (e)	0.78±0.01
Inclination (i)	68.9±0.7°
Longitude of the node (Ω)	63.5±0.8°
Periastron epoch (T)	61118±35
Argument of periastron (ω) (secondary)	338±4°
Orbit [7]
Primary	Ba
Companion	Bb
Period (P)	4.77095±0.00023 d
Semi-major axis (a)	0.055±0.013  mas
Eccentricity (e)	0.0
Inclination (i)	30±19°
Longitude of the node (Ω)	310±14°
Periastron epoch (T)	59529.10±0.01
Argument of periastron (ω) (secondary)	0.0°
Semi-amplitude (K1) (primary)	72.9±0.3 km/s
Details
128 Tau A
Mass	6.14 [8]   M☉
Luminosity	2,061 [4]   L☉
Temperature	17,900 [4]   K
Ba
Mass	3.19 [8]   M☉
B
Mass	1.65 [8]   M☉
Other designations
BD+16°841, HD 37711, HIP 26777, HR 1946, SAO 94759
Database references
SIMBAD	data

126 Tauri (126 Tau) is a triple star system in the constellation Taurus, approximately 600 light years away. Its apparent magnitude is 4.83, making it visible to the naked eye with dark skies.

126 Tauri is a well-known binary star with the two components in an eccentric orbit of over a hundred years. The secondary, component B, has also shown radial velocity variations that indicate an unseen companion in a 4.77-day orbit. ^[7]

The combined spectral class is typically quoted as B3IV, occasionally B3V. ^[9] The primary alone has been classed as B3V, ^[10] although the two components have been individually measured at B8V and B7V. ^[7]

References

1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 –L30. Bibcode:2000A&A...355L..27H.
3. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 20 August 2017.
4. Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv: 1003.2335 . Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID   111387483.
5. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
6. Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv: 0705.0878 . Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. S2CID   119323941.
7. Gardner, Tyler; Monnier, John D.; Fekel, Francis C.; Le Bouquin, Jean-Baptiste; Scovera, Adam; Schaefer, Gail; Kraus, Stefan; Adams, Fred C.; Anugu, Narsireddy; Berger, Jean-Philippe; Ten Brummelaar, Theo; Davies, Claire L.; Ennis, Jacob; Gies, Douglas R.; Johnson, Keith J. C.; Kervella, Pierre; Kratter, Kaitlin M.; Labdon, Aaron; Lanthermann, Cyprien; Sahlmann, Johannes; Setterholm, Benjamin R. (2022). "ARMADA. II. Further Detections of Inner Companions to Intermediate-mass Binaries with Microarcsecond Astrometry at CHARA and VLTI". The Astronomical Journal. 164 (5): 184. arXiv: 2209.00669 . Bibcode:2022AJ....164..184G. doi: 10.3847/1538-3881/ac8eae .
8. Tokovinin, Andrei (2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv: 1712.04750 . Bibcode:2018ApJS..235....6T. doi: 10.3847/1538-4365/aaa1a5 .
9. Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009- )". Vizier Online Data Catalog. Bibcode:2014yCat....1.2023S.
10. Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright Star Catalogue. Yale University Observatory. Bibcode:1991bsc..book.....H.