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Star in the constellation Taurus
21 Tauri , formally known as Asterope ,
[12]
[13] 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,
[2] although anybody viewing the object is likely to instead see the pair as a single elongated form of magnitude 5.6.
[14] The distance to 21 Tauri can be estimated from its annual
parallax shift of 7.6
mas ,
[1] yielding a range of around 431
light years . It is moving further from the Earth with a heliocentric
radial velocity of +6 km/s.
[4]
Asterope was one of the
Pleiades sisters in
Greek mythology . In 2016, the
International Astronomical Union organized a
Working Group on Star Names (WGSN)
[15] to catalogue and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire
multiple systems .
[16] It approved the name Asterope for 21 Tauri on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.
[13]
21 Tauri is a blue-white hued
B-type main sequence star with a
stellar classification of B8 V.
[3] It is a single
[17] star with around three
[2] times the
mass of the Sun and is 100
[9] million years old. The star is radiating 100
[2] times the
Sun's luminosity from its
photosphere at an
effective temperature of 11,041 K.
[2] It displays an
infrared excess , but this is due to
reflection nebula rather than a
circumstellar disk .
[9]
References
^
a
b
c
d
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 .
^
a
b
c
d
e
f
g
h
i
j Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics , 537 : A120,
arXiv :
1201.2052 ,
Bibcode :
2012A&A...537A.120Z ,
doi :
10.1051/0004-6361/201117691 ,
S2CID
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^
a
b Palmer, D. R.; et al. (1968), "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars", Royal Observatory Bulletin , 135 : 385,
Bibcode :
1968RGOB..135..385P .
^
a
b 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,
arXiv :
1208.3048 ,
Bibcode :
2012A&A...546A..61D ,
doi :
10.1051/0004-6361/201219219 ,
S2CID
59451347 , A61.
^
a
b Brown, A. G. A.; et al. (Gaia collaboration) (November 2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy & Astrophysics . 595 : A2.
arXiv :
1609.04172 .
Bibcode :
2016A&A...595A...2G .
doi :
10.1051/0004-6361/201629512 .
S2CID
1828208 .
^ 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
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^ 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 :
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S2CID
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^ Simón-Díaz, S.; et al. (January 2017), "The IACOB project . III. New observational clues to understand macroturbulent broadening in massive O- and B-type stars", Astronomy & Astrophysics , 597 : 17,
arXiv :
1608.05508 ,
Bibcode :
2017A&A...597A..22S ,
doi :
10.1051/0004-6361/201628541 ,
S2CID
3478126 , A22.
^
a
b
c Smith, R.; Wyatt, M. C. (June 2010), "Warm dusty discs: exploring the A star 24 μm debris population", Astronomy and Astrophysics , 515 : 16,
arXiv :
1004.0644 ,
Bibcode :
2010A&A...515A..95S ,
doi :
10.1051/0004-6361/200913481 ,
S2CID
118989677 , A95.
^ Allen, Richard Hinckley (1963),
Star names - Their Lore and Meaning , Dover Books, p. 407, retrieved 2016-09-14 .
^
"21 Tau" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved November 21, 2018 .
^ Davis, George A. (1944).
"The pronunciations, derivations, and meanings of a selected list of star names" . Popular Astronomy . 52 : 8–30.
Bibcode :
1944PA.....52....8D .
^
a
b
Naming Stars , IAU.org, retrieved 18 June 2018 .
^ 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
^
IAU Working Group on Star Names (WGSN) ,
International Astronomical Union , retrieved 22 May 2016 .
^
WG Triennial Report (2015-2018) - Star Names (PDF) , p. 5, retrieved 2018-07-14 .
^ Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society , 424 (3): 1925–1929,
arXiv :
1205.5238 ,
Bibcode :
2012MNRAS.424.1925C ,
doi :
10.1111/j.1365-2966.2012.21317.x ,
S2CID
119120749 .