Chi Tauri

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Chi Tauri

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Chi Tauri
Observation data Epoch J2000 Equinox J2000
Location of χ Tauri (circled)
Constellation	Taurus
χ Tau A
Right ascension	04^h 22^m 34.944^s^[1]
Declination	+25° 37′ 45.53″^[1]
Apparent magnitude (V)	5.378^[2]
χ Tau B
Right ascension	04^h 22^m 35.550^s^[3]
Declination	+25° 38′ 03.22″^[3]
Apparent magnitude (V)	8.423^[4]
Characteristics
χ Tau A
Spectral type	B9V^[4]
U−B color index	-0.12^[5]
B−V color index	-0.04^[5]
χ Tau B
Spectral type	F8 + G6 + K4 + K4^[4]
U−B color index	+0.10^[5]
B−V color index	+0.63^[5]
Astrometry
χ Tau A
Radial velocity (R_v)	+15.3 ± 3.4^[4] km/s
Proper motion (μ)	RA: 20.953^[1] mas/yr Dec.: -16.495^[1] mas/yr
Parallax (π)	11.0472 ± 0.1599 mas^[1]
Distance	295 ± 4 ly (91 ± 1 pc)
Absolute magnitude (M_V)	0.82 ± 0.18^[4]
χ Tau B
Radial velocity (R_v)	+14.694 ± 0.081^[4] km/s
Proper motion (μ)	RA: 15.766^[3] mas/yr Dec.: −20.396^[3] mas/yr
Parallax (π)	11.5348 ± 0.0857 mas^[3]
Distance	283 ± 2 ly (86.7 ± 0.6 pc)
Absolute magnitude (M_V)	3.85 ± 0.18 (total) 4.20 ± 0.18 (Ba) 5.27 ± 0.18 (Bb) 7.87 / 7.87 (Bc)^[4]
Orbit^[4]
Primary	χ Tau Ba
Companion	χ Tau Bb
Period (P)	17.602309 ± 0.000036 d
Eccentricity (e)	0.2938 ± 0.0013
Inclination (i)	53.3 ± 0.5°
Periastron epoch (T)	2,448,891.649 ± 0.014
Argument of periastron (ω) (secondary)	249.43 ± 0.33°
Semi-amplitude (K₁) (primary)	41.287 ± 0.080 km/s
Semi-amplitude (K₂) (secondary)	48.133 ± 0.080 km/s
Orbit^[4]
Primary	χ Tau Bab
Companion	χ Tau Bc
Period (P)	3,450.6 ± 6.1 d
Eccentricity (e)	0.3560 ± 0.0068
Inclination (i)	73 ± 6°
Periastron epoch (T)	2,447,546.5 ± 9.7
Argument of periastron (ω) (secondary)	250.3 ± 1.5°
Semi-amplitude (K₁) (primary)	8.625 ± 0.067 km/s
Details

Age	200 ± 50^[4] Myr
χ Tau A
Mass	2.60 ± 0.05^[4] `M`_☉
Radius	2.15^[6] `R`_☉
Surface gravity (log g)	4.15 ± 0.14^[7] cgs
Temperature	10,300 ± 300^[4] K
Rotational velocity (v sin i)	263^[7] km/s

χ Tau Ba
Mass	1.19^[4] `M`_☉
Surface gravity (log g)	4.5^[4] cgs
Temperature	6,180 ± 150^[4] K
Rotational velocity (v sin i)	1 ± 3^[4] km/s
χ Tau Bb
Mass	1.02^[4] `M`_☉
Surface gravity (log g)	4.5^[4] cgs
Temperature	5,620 ± 150^[4] K
Rotational velocity (v sin i)	1 ± 3^[4] km/s

χ Tau Bc
Mass	~0.70 / 0.70^[4] `M`_☉

Other designations
χ Tau, 59 Tau, BD+25° 707, HD 27638, HIP 20430, HR 1369, SAO 76573, ADS 3161 AB, CCDM J04226+2538AB
Database references
SIMBAD	χ Tau A
	χ Tau B

Chi Tauri, Latinised from χ Tauri, is a star system in the constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 291 light-years (89 parsecs) from Earth. The primary component has an apparent magnitude of about 5.4,^[2] meaning it is visible with the naked eye.

The main component of the system is Chi Tauri A. It is a B-type main-sequence star. Its mass is 2.6 times that of the Sun and its surface glows with an effective temperature of 10,300 K. It may be a binary star itself, as suggested from astrometric data from Hipparcos, although no orbit could be derived.^[4]

The secondary component of the system is Chi Tauri B, separated about 19″^[4] from Chi Tauri A. It was thought to be a post-T Tauri star from its unusual spectrum,^[8] but later studies ruled this out.^[4] It is a double-lined spectroscopic binary—the two stars are not resolved but their spectra have periodic Doppler shifts indicating orbital motion. The two stars are an F-type star and a G-type star, respectively, and are designated Ba and Bb.^[4]

The radial velocity of Chi Tauri B has a slow drift indicating the presence of another star in the system. Designated Chi Tauri Bc, this massive object is too dim to be detected, but it appears in Chi Tauri B's spectrum as an infrared excess. Because of this infrared excess, this unseen component is thought to be a pair of K-type main-sequence stars both with masses 70% of the Sun's. The stars within the system appear to be dynamically interacting.^[4]

Naming

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With φ, κ¹, κ² and υ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs.^[9] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Kalbain were the title for five stars: φ as Alkalbain I, this star (χ) as Alkalbain II, κ¹ as Alkalbain III, κ² as Alkalbain IV and υ as Alkalbain V.^[10]^{[clarification needed]}
In Chinese, 礪石 (Lì Dàn), meaning Whetstone, refers to an asterism consisting of χ Tauri, ψ Tauri, 44 Tauri and φ Tauri. Consequently, the Chinese name for χ Tauri itself is 礪石三 (Lì Dàn sān, English: the Third Star of Whetstone).^[11]

References

[edit]

^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b 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.
^ ^a ^b ^c ^d ^e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
^ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p ^q ^r ^s ^t ^u ^v ^w ^x ^y ^z Torres, Guillermo (2006). "The Multiple System HD 27638". The Astronomical Journal. 131 (3): 1702–1711. arXiv:astro-ph/0512254. Bibcode:2006AJ....131.1702T. doi:10.1086/500355. S2CID 119106287.
^ ^a ^b ^c ^d Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics". Astronomy & Astrophysics. 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
^ ^a ^b David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146. S2CID 33401607.
^ Lindroos, K. P. (1986). "A study of visual double stars with early-type primaries. V - Post-T Tauri secondaries". Astronomy and Astrophysics. 156 (1–2): 223–233. Bibcode:1986A&A...156..223L.
^ Allen, Richard Hinckley (1899). Star-Names and Their Meanings. New York: G. E. Stechert. p. 413.
^ Rhoads, Jack W. (November 15, 1971). "Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars" (PDF). Jet Propulsion Laboratory, California Institute of Technology. {{cite journal}}: Cite journal requires |journal= (help)
^ "天文教育資訊網" [AEEA (Activities of Exhibition and Education in Astronomy)] (in Chinese). 2006-05-22. Archived from the original on 2011-09-28. Retrieved 2019-06-20.

Constellation of Taurus

Stars

Bayer	α (Aldebaran) β (Elnath) γ (Prima Hyadum) δ¹ (Secunda Hyadum) δ² δ³ ε (Ain) ζ (Tianguan) η (Alcyone) θ¹ θ² (Chamukuy) ι κ¹ κ² λ μ ν ξ ο π ρ σ¹ σ² τ υ φ χ ψ ω¹ ω²
Flamsteed	4 (s) 5 (f) 6 (t) 7 9 10 11 12 13 14 16 (Celaeno) 17 (Electra) 18 19 (Taygeta) 20 (Maia) 21 (Asterope) 22 (Asterope II) 23 (Merope) 24 26 27 (Atlas) 28 (Pleione) 29 (u) 30 (e) 31 32 33 36 37 (A¹) 39 (A²) 40 41 44 (p) 45 46 47 48 51 53 55 56 57 (h) 58 60 62 63 66 (r) 70 71 72 75 76 79 (b) 80 81 83 84 85 88 (d) 89 90 (c) 93 95 96 97 (i) 98 (k) 99 101 103 104 (m) 105 106 (l) 107 108 109 (n) 110 111 113 114 (o) 115 116 117 118 119 120 121 122 125 126 127 128 129 130 131 132 133 134 135 136 137 139 140 44 Eri 49 Eri
Variable	T Y Z RR RV RW RY RZ SU SV SZ TU UX UZ VY XX XZ AA AH BP CD CI CM CQ CT CU CW CY DD DF DG DH DI DL DM DN DO DQ DR DS EQ EU FN FS FU FV GG GI GK GV HK HL HU IK V410 V441 V471 V473 V479 V534 V624 V647 V650 V710 V711 V731 V766 V773 V774 V781 V807 V818 V819 V826 V827 V830 V833 V834 V836 V837 V892 V987 V1038 V1062 V1079 V1116 V1137 V1141 V1143 V1156 V1187 V1229 V1232 V1241 (WX Cas) V1298
HR	1023 1028 1039 1067 1085 1089 1102 1103 1110 1119 1137 1159 1172 1183 1185 1188 1201 1222 1224 1233 1237 1238 1253 1254 1257 1279 1280 1284 1295 1307 1310 1315 1349 1354 1358 1360 1370 1385 1400 1402 1403 1406 1413 1425 1427 1436 1442 1445 1446 1448 1455 1477 1480 1490 1512 1517 1554 1566 1575 1585 1633 1642 1741 1750 1755 1831 1847 1860 1878 1902 1921 1929 1954 1997 2013 2074
HD	21032 21585 23514 23712 24040 24368 24496 26292 27860 28086 28678 29627 29647 36112 37124 38263 38524 245134 285507
Other	2MASS J03552337+1133437 2MASS J04070752+1546457 2MASS J0441+2301 A0535+26 BD +24 692 Butterfly Star CoKu Tau/4 Elias 16 Elias 18 GD 71 Gliese 176 Haro 6-37 HBC 379 HH 30 HII 686 HII 1306 HII 1883 HII 3163 HP Tau/G2 Hubble I 4 HZ 9 IRAS 04239+2436 IRAS 04248+2612 IRAS 04325+2402 IRAS 04381+2540 K2-25 L1489 IRS L1527 L1551 IRS 5 L1521F-IRS MWC 480 PSR B0525+21 PSR B0540+23 PSR J0348+0432 PSR J0538+2813 Teide 1 TMR-1 TMC-1A WD 0346+246 WISE 0410+1502

Exoplanets	Aldebaran b ε Tauri b BD+20 594b HD 24040 b HD 37124 b c d Kojima-1Lb TOI-4603 b