22 Tauri

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22 Tauri
Observation data
Epoch J2000       Equinox J2000
Constellation Taurus
Right ascension 03h 46m 02.90030s [1]
Declination +24° 31′ 40.4313″ [1]
Apparent magnitude  (V)6.43 [2]
Characteristics
Spectral type A0 Vn [3]
B−V color index −0.020±0.006 [2]
Astrometry
Radial velocity (Rv)+6.9±1.3 [2]  km/s
Proper motion (μ)RA: +19.599 [1]   mas/yr
Dec.: −45.077 [1]   mas/yr
Parallax (π)7.3453 ± 0.0921  mas [1]
Distance 444 ± 6  ly
(136 ± 2  pc)
Absolute magnitude  (MV)1.00 [2]
Details
Radius 3.1 [4]   R☉
Luminosity 63.6 [2]   L☉
Surface gravity (log g)4.209±0.113 [5]   cgs
Temperature 11,817±191 [5]   K
Metallicity [Fe/H]−0.1 [6]   dex
Rotational velocity (v sin i)232 [6]  km/s
Other designations
Sterope II [7] , 22 Tau, BD+24° 556, GC  4506, HD  23441, HIP  17588, HR  1152, SAO  76164 [8]
Database references
SIMBAD data
22 Tauri Plei scheme.jpg
22 Tauri

22 Tauri is a component of the Asterope double star in the Pleiades open cluster. 22 Tauri is the stars' Flamsteed designation. It is situated near the ecliptic and thus is subject to lunar occultation. [9] The star has an apparent visual magnitude of 6.43, [2] which is near the lower threshold of visibility to the naked eye. Anybody attempting to view the object is likely to instead see the Asterope pair as a single elongated form of magnitude 5.6. [10] Based upon an annual parallax shift of 7.35  mas , [1] this star is located 444  light years away from the Sun. It is moving further from the Earth with a heliocentric radial velocity of +7 km/s. [2]

This is an ordinary A-type main-sequence star with a stellar classification of A0 Vn. [3] The 'n' suffix indicates the spectrum displays "nebulous" absorption lines due to rapid rotation. This is confirmed by a high projected rotational velocity of 232 km/s. [6] The star is radiating sixty times the Sun's luminosity from its photosphere at an effective temperature of 11,817 K. [5]

Related Research Articles

21 Tauri, formally known as Asterope, is a component of the Asterope double star in the Pleiades open cluster. 21 Tauri is the stars' Flamsteed designation. This star is potentially faintly visible to the naked eye with an apparent visual magnitude of 5.76 in ideal conditions, although anybody viewing the object is likely to instead see the pair as a single elongated form of magnitude 5.6. The distance to 21 Tauri can be estimated from its annual parallax shift of 7.6 mas, yielding a range of around 431 light years. It is moving further from the Earth with a heliocentric radial velocity of +6 km/s.

<span class="mw-page-title-main">Nu Tauri</span> Star in the constellation Taurus

ν Tauri, Latinized as Nu Tauri, is a single star in the zodiac constellation of Taurus. It is a white-hued star and is visible to the naked eye with an apparent visual magnitude of +3.91. This object is located 117 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −6 km/s. It is predicted to come to within roughly 18.4 ly of the Sun in around five million years.

<span class="mw-page-title-main">Sigma Tauri</span> Star in the constellation Taurus

Sigma Tauri is the Bayer designation for a pair of white-hued stars in the zodiac constellation of Taurus. The system is a visual double star, whose components are designated σ1 Tauri and σ2 Tauri, with the latter being the more northerly star. The two are separated by 7.2 arcminutes on the sky and can be readily split with a pair of binoculars. They have apparent visual magnitudes of +5.07 and +4.70, respectively, which indicates they are both visible to the naked eye. Based upon parallax measurements, σ1 Tauri is about 147 light years from the Sun, while σ2 Tauri is 156 light years distant.

<span class="mw-page-title-main">Chi Tauri</span> Star in the constellation Taurus

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 from Earth. The primary component has an apparent magnitude of about 5.4, meaning it is visible with the naked eye.

Delta<sup>2</sup> Tauri Star in the constellation Taurus

Delta2 Tauri is a solitary, white-hued star in the zodiac constellation of Taurus. Based upon an annual parallax shift of 20.21 mas as seen from Earth, it is located roughly 161 light years distant from the Sun. It is separated from δ1 Tauri by 0.3° on the sky and is faintly visible to the naked eye with an apparent visual magnitude of +4.80. The star is considered a member of the Hyades cluster.

4 Arietis is a single star in the northern constellation of Aries, the ram. 4 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.86. The star has an annual parallax shift of 11.46±0.15 mas, which is equivalent to a distance of 285 light-years from the Sun. It is moving further from the Earth with a heliocentric radial velocity of +6 km/s.

Xi Aurigae, Latinized from ξ Aurigae, is the Bayer designation for a single, white-hued star in the northern constellation of Auriga. This star was once considered part of the constellation of Camelopardalis and held the Flamsteed designation 32 Camelopardalis. It is visible to the naked eye with an apparent visual magnitude of +5.0. The measured annual parallax shift of this star is 13.37 ± 0.17 mas, which corresponds to a physical distance of 244 light-years with a 3 light-year margin of error. At that distance, the visual magnitude of the star is diminished by an extinction of 0.108 due to interstellar dust.

49 Aurigae is a single star located 680 light years away from the Sun in the northern constellation of Auriga. It is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.26. The star is moving away from the Earth with a heliocentric radial velocity of +17 km/s, having come to within 149 ly some 5.5 million years ago. It is positioned near the ecliptic and thus is subject to lunar occultations.

ω2 Cancri is a star in the zodiac constellation Cancer, located around 810 light years away from the Sun. It has the Flamsteed designation 4 Cancri; ω2 Cancri is the Bayer designation, which is Latinised to omega2 Cancri and abbreviated to ω2 Cnc or omega2 Cnc. The star is near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 6.32. It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s. The position of this star near the ecliptic means it is subject to lunar occultations.

29 Cancri is a star in the zodiac constellation of Cancer, located 370 light years from the Sun. It is just visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.94. The star is situated near the ecliptic, which means it is subject to lunar occultations.

<span class="mw-page-title-main">54 Ceti</span> Star in the constellation Aries

54 Ceti is an older Flamsteed designation for a star that is now located within the constellation boundaries of Aries, the Ram. In the present day it is known by star catalogue identifiers like HD 11257 or HR 534. At an apparent visual magnitude of 5.94, it can be seen with the naked eye. The distance to this star, as determined using parallax measurements made during the Hipparcos mission, is approximately 139 light-years, give or take a 6 light-year margin of error. It is located near the ecliptic and hence is subject to occasional occultation by the Moon.

67 Aquarii is a star located 484 light years away from the Sun in the zodiac constellation of Aquarius. 67 Aquarii is its Flamsteed designation. It is a dim, blue-white hued star near the lower limit of visibility to the naked eye with an apparent visual magnitude of 6.40. At the distance of this star, its visual magnitude is diminished by an extinction of 0.11 due to interstellar dust. The position of this star near the ecliptic means it is subject to lunar eclipses.

Tau1 Hydrae is a triple star system in the equatorial constellation of Hydra. Based upon the annual parallax shift of the two visible components as seen from Earth, they are located about 18 parsecs (59 ly) from the Sun. The system has a combined apparent visual magnitude of +4.59, which is bright enough to be visible to the naked eye at night.

<span class="mw-page-title-main">HD 28527</span> Star in the constellation Taurus

HD 28527 is a star in the constellation Taurus, and a member of the Hyades open cluster. It is faintly visible to the naked eye with an apparent visual magnitude of 4.78. The distance to this star, as determined from its parallax shift of 22 mas, is 148 light years. It is moving away from the Earth with a heliocentric radial velocity of +38 km/s.

134 Tauri is a single star in the zodiac constellation of Taurus. Its apparent magnitude is 4.89, which is bright enough to be faintly visible to the naked eye. The distance to this star, based upon an annual parallax shift of 13.11±0.33 mas, is around 249 light years. The star is moving further from the Sun with a heliocentric radial velocity of +20.5 km/s, having made its closest approach some three million years ago at a distance of 107 ly (32.7 pc).

59 Persei is a suspected astrometric binary star system in the northern constellation of Perseus. It is visible to the naked eye as a dim, white-hued star with an apparent magnitude of 5.30. The star is located around 256 light years distant from the Sun, based on parallax, and is drifting further away with a radial velocity of +13 km/s.

53 Ophiuchi is a multiple star system in the equatorial constellation of Ophiuchus. It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 5.80. Located around 370 light years distant from the Sun based on parallax, it is moving closer to the Earth with a heliocentric radial velocity of −14 km/s. As of 2011, the visible components had an angular separation of 41.28″ along a position angle of 190°. The primary may itself be a close binary system with a separation of 0.3692″ and a magnitude difference of 3.97 at an infrared wavelength of 562 nm.

Sigma1 Gruis, a Latinization of σ1 Gruis, is a star in the constellation Grus. It is a dim, white-hued star near the lower limit for visibility to the naked eye with an apparent visual magnitude of 6.26. This object is located 229 light-years (70.1 pc) distant from the Sun based on parallax. The radial velocity of this star is poorly constrained, but it appears to be drifting further away at the rate of +7 km/s.

18 Tauri is a single star in the zodiac constellation of Taurus, located 444 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of 5.66. The star is moving further from the Earth with a heliocentric radial velocity of +4.8. It is a member of the Pleiades open cluster, which is positioned near the ecliptic and thus is subject to lunar occultations.

<span class="mw-page-title-main">72 Tauri</span> Star in the constellation of Taurus

72 Tauri is a possible binary star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.5, although only 0.29° from the brighter υ Tauri. Based upon an annual parallax shift of 7.9 mas seen from Earth, it is around 410 light years from the Sun.

References

  1. 1 2 3 4 5 6 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 .
  2. 1 2 3 4 5 6 7 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv: 1108.4971 , Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID   119257644.
  3. 1 2 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
  4. ↑ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv: astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID   425754.
  5. 1 2 3 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.
  6. 1 2 3 Gebran, M.; et al. (2016), "A new method for the inversion of atmospheric parameters of A/Am stars", Astronomy & Astrophysics, 589: A83, arXiv: 1603.01146 , Bibcode:2016A&A...589A..83G, doi:10.1051/0004-6361/201528052, S2CID   118549566.
  7. ↑ Allen, Richard Hinckley (1963), Star names - Their Lore and Meaning, Dover Books, p. 407, retrieved 2016-09-14.
  8. ↑ "22 Tau". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved November 21, 2018.
  9. ↑ Schmidtke, P. C.; Africano, J. L. (2011), "KPNO Lunar Occultation Summary. III", The Astronomical Journal, 141 (1): 10, Bibcode:2011AJ....141...10S, doi: 10.1088/0004-6256/141/1/10 .
  10. ↑ Schaaf, Fred; Myers, Doug (2012), Seeing the Sky: 100 Projects, Activities & Explorations in Astronomy, Dover Books on Astronomy, Courier Corporation, p. 56, ISBN   978-0486488882
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