HD 100673

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HD 100673
Centaurus IAU.svg
Cercle rouge 100%25.svg
Location of A Centauri (circled)
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Centaurus
Right ascension 11h 34m 45.66s [1]
Declination −54° 15 50.7 [1]
Apparent magnitude  (V)+4.62 [2]
Characteristics
Evolutionary stage Main sequence [3]
Spectral type B9V [4]
U−B color index −0.21
B−V color index −0.077±0.005 [2]
Astrometry
Radial velocity (Rv)+5.7±2.2 [2]  km/s
Proper motion (μ)RA: −56.17±0.18 [1]   mas/yr
Dec.: 16.19±0.20 [1]   mas/yr
Parallax (π)7.65 ± 0.22  mas [1]
Distance 430 ± 10  ly
(131 ± 4  pc)
Absolute magnitude  (MV)−0.96 [2]
Details
Mass 3.58±0.05 [3]   M
Radius 2.4–3.1 [5]   R
Luminosity 306 [3]   L
Temperature 10,600 [3]   K
Rotational velocity (v sin i)160 [3]  km/s
Other designations
A Cen, CPD−53°4637, FK5  2926, GC  15877, HD  100673, HIP  56480, HR  4460, SAO  239189 [6]
Database references
SIMBAD data

A Centauri is a single [7] star in the southern constellation of Centaurus. It is blue-white in hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.62. [2] The star is located at a distance of approximately 430  light-years from the Sun based on stellar parallax. [1] It appears to be drifting further away with a radial velocity of around +6 km/s. [2]

This is a rapidly rotating Be star, showing an emission-line spectrum on top of the normal absorption spectrum of the star, due to a circumstellar disk of ejected matter. It doesn't show any absorption lines from the disk. [8] It is a B-type main-sequence star with a stellar classification of B9V. [4]

Related Research Articles

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

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Kappa Leporis, Latinized from κ Leporis, is a binary star system in the southern constellation of Lepus. The pair have apparent visual magnitudes of 4.43 and 7.00, with the former being bright enough to be seen with the naked eye. As of 2000, they had an angular separation of 2.179 arc seconds along a position angle of 357.3°. Based upon an annual parallax shift of 4.48 mas as measured from Earth, the system is located roughly 730 light years from the Sun. The system is travelling away from the Sun with a radial velocity of +20.8 km/s.

Pi<sup>6</sup> Orionis Star in the constellation Orion

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<span class="mw-page-title-main">Eta Delphini</span> Star in the constellation Delphinus

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Omicron2 Orionis is a solitary star in the constellation Orion. It has an apparent visual magnitude of 4.06, which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 17.54 mas, it is around 186 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an interstellar absorption factor of 0.09 due to intervening dust.

Nu Leporis, Latinized from ν Leporis, is a probable astrometric binary star system in the constellation Lepus. It is visible to the naked eye as a faint star with an apparent visual magnitude of 5.29. Based upon an annual parallax shift of 7.70 mas as seen from the Earth, it is 420 light years from the Sun.

<span class="mw-page-title-main">55 Persei</span> Star in the constellation Perseus

55 Persei is a single, blue-white hued star in the northern constellation Perseus. It is faintly visible to the naked eye under good seeing conditions, having an apparent visual magnitude of 5.73. Based upon an annual parallax shift of 8.50±0.38 mas as seen from Earth's orbit, the star is located about 380 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction of 0.39 due to interstellar dust.

References

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  3. 1 2 3 4 5 Zorec, J.; Royer, F. (January 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   55586789.
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  6. "A Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-02-27.
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  8. Hanuschik, R. W. (1996). "On the structure of be star disks". Astronomy and Astrophysics. 308: 170. Bibcode:1996A&A...308..170H.