Upsilon Tauri

Short description: Star in the constellation of Taurus

Not to be confused with Y Tauri.

υ Tauri

Location of υ Tauri (circled)

Observation data
Equinox J2000.0]] (ICRS)
Constellation | Taurus[1]
Right ascension |  04h 26m 18.46368s[2]
Declination | +22° 48′ 48.8885″[2]
Apparent magnitude (V) | 4.28 - 4.31[3]
Characteristics
Evolutionary stage | main sequence[4]
Spectral type | A8 Vn[5]
U−B color index | +0.14[6]
B−V color index | +0.25[6]
Variable type | δ Scuti[3]
Astrometry
Radial velocity (Rv)| 32.2±1.1[7] km/s
Proper motion (μ)|  RA: +108.81[2] mas/yr
Dec.: −46.80[2] mas/yr
Parallax (π)| 21.21 ± 0.25[2] mas
Distance| 154 ± 2 ly
(47.1 ± 0.6 pc)
Absolute magnitude (MV)| +0.91[1]
Details
Mass| 1.55[8] M☉
Radius| 1.803[9] R☉
Luminosity| 32.5[10] L☉
Surface gravity (log g)| 3.50[8] cgs
Temperature| 7,398±252[8] K
Rotation| 0.415 d[9]
Rotational velocity (v sin i)| 243[5] km/s
Age| 827[8] Myr
Other designations

υ Tau, υ1 Tau, 69 Tauri, BD+22 696, FK5 2326, HD 28024, HIP 20711, HR 1392, SAO 76608[11]

Database references
SIMBAD| data

Upsilon Tauri (υ Tauri) is a solitary,[12] white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster.[9] It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.

## Properties

A light curve for Upsilon Tauri, plotted from TESS data[13]

This is an A-type main sequence star with a stellar classification of A8 Vn.[5] It is classified as a Delta Scuti type variable star and its brightness varies from magnitude +4.28 to +4.31 with a period of 3.56 hours.[3] At an estimated age of 827 million years,[8] it is spinning rapidly with a rotation period of just 0.415 days.[9] This is giving the star an oblate shape with an equatorial bulge that is 9% larger than the polar radius.[14]

Occasionally this star system shares the Bayer designation υ Tauri with 72 Tauri, which is separated from it by 0.29° in the sky.[15]

## Naming

With φ, κ1, κ2 and χ, it composed the Arabic were the Arabs' Al Kalbain, the Two Dogs.[16] 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, χ as Alkalbain II, κ1 as Alkalbain III, κ2 as Alkalbain IV and this star (υ) as Alkalbain V.[17]

## References

1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A XHIP record for this object at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
3. ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
4. ↑ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z.
5. ↑ 5.0 5.1 5.2 Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, doi:10.1051/0004-6361:20065224, Bibcode: 2007A&A...463..671R.
6. ↑ 6.0 6.1 Danziger, I. J.; Dickens, R. J. (July 1967), "Spectrophotometry of New Short-Period Variable Stars", Astrophysical Journal 149: 55, doi:10.1086/149231, Bibcode: 1967ApJ...149...55D.
7. ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: 14, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
8. ↑ 8.0 8.1 8.2 8.3 8.4 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
9. ↑ 9.0 9.1 9.2 9.3 van Saders, Jennifer L.; Pinsonneault, Marc H. (October 2013), "Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic", The Astrophysical Journal 776 (2): 20, doi:10.1088/0004-637X/776/2/67, 67, Bibcode: 2013ApJ...776...67V.
10. ↑ McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
11. ↑ "ups Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Tau.
12. ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
13. ↑ MAST: Barbara A. Mikulski Archive for Space Telescopes, Space Telescope Science Institute, https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html, retrieved 8 December 2021.
14. ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review 20 (1): 51, doi:10.1007/s00159-012-0051-2, Bibcode: 2012A&ARv..20...51V.
15. ↑ Hoffleit, D.; Jaschek, C. (1991), The Bright Star Catalogue, New Haven: Yale University Observatory, Bibcode: 1991bsc..book.....H.
16. ↑ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 413
17. ↑ Rhoads, Jack W. (November 15, 1971), Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology, https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf.

* v
* t
* e

Stars of Taurus

Bayer|

* α (Aldebaran)
* β (Elnath)
* γ (Prima Hyadum)
* δ1 (Secunda Hyadum)
* δ2
* δ3
* ε (Ain)
* ζ (Tianguan)
* η (Alcyone)
* θ1
* θ2
* 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 (i)
* 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
* CQ
* CT
* CU
* CW
* CY
* DD
* DF
* DG
* DH
* DI
* DL
* DM
* DN
* DO
* DQ
* DR
* DS
* EQ
* EU
* FN
* FS
* FV
* GG
* GI
* GK
* GV
* HK
* HL
* HU
* IK
* V410
* V471
* V473
* V479
* V534
* V624
* V647
* V650
* V710
* V711
* V731
* V766
* V773
* V774
* V781
* V807
* V818
* V819
* V826
* V827
* V827
* V830
* V833
* V834
* V836
* V837
* V892
* V987
* V1038
* V1062
* V1116
* V1137
* V1141
* V1143
* V1156
* V1187
* V1229
* V1232
* V1241 (WX Eri)

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
* 28375
* 28678
* 29627
* 29647
* 36112
* 37124
* 38263
* 38524
* 285507

Gliese|

* Gliese 176

Other|

* 2MASS J03552337+1133437
* 2MASS J04414489+2301513
* A0535+26
* BD +24 692
* Butterfly star
* CoKu Tau/4
* Crab Pulsar
* Elias 16
* Elias 18
* GD 71
* Haro 6-37
* HBC 379
* HH 30
* HII 686
* HII 1306
* HII 1883
* HII 3163
* HL Tau 76
* HP Tau/G2
* Hubble I 4
* HZ 9
* IRAS 04239+2436
* IRAS 04248+2612
* IRAS 04325+2402
* IRAS 04381+2540
* L1489 IRS
* L1527
* L1551 IRS 5
* L1521F-IRS
* LkCa 15
* 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

* List

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