69 Orionis

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69 Orionis
Orion constellation map.svg
Red circle.svg
Location of 69 Orionis (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Orion
Right ascension 06h 12m 03.27955s [1]
Declination 16° 07′ 49.4614″ [1]
Apparent magnitude  (V)4.92 [2]
Characteristics
Evolutionary stage main sequence
Spectral type B5Vn [3]
U−B color index −0.59 [2]
B−V color index −0.12 [2]
Astrometry
Radial velocity (Rv)+22.00 [4]  km/s
Proper motion (μ)RA: +5.49 [1]   mas/yr
Dec.: −16.80 [1]   mas/yr
Parallax (π)6.17 ± 0.25  mas [1]
Distance 530 ± 20  ly
(162 ± 7  pc)
Absolute magnitude  (MV)−1.09 [5]
Details [6]
Mass 6.4±0.2  M☉
Radius 3.4 [7]   R☉
Luminosity 1,442+248
−212  L☉
Surface gravity (log g)4.05±0.17  cgs
Temperature 17,090  K
Metallicity [Fe/H]+0.01 [8]   dex
Rotational velocity (v sin i)285±23 km/s
Age 10–40 [9]   Myr
Other designations
f1 Ori, 69 Ori, BD+16°1035, GC  7891, HD  42545, HIP  29434, HR  2198, SAO  95365 [10]
Database references
SIMBAD data

69 Orionis is a single [11] star in the equatorial constellation of Orion, positioned a couple of degrees to the north of Xi Orionis. It has the Bayer designation f1 Orionis; 69 Orionis is the Flamsteed designation. The star is visible to the naked eye as faint, blue-white hued point of light with an apparent visual magnitude of 4.92. [2] It is located approximately 530  light-years from the Sun based on parallax, [1] and is drifting further away with a radial velocity of +22 km/s. [4] In 2015, H. Bouy and J. Alves suggested that it is a member of the newly discovered Taurion OB association. [9]

This object is a B-type main-sequence star with a stellar classification of B5Vn, [3] where the 'n' suffix indicates "nebulous" (broad) lines due to rapid rotation. It has a projected rotational velocity of 285 km/s, compared to a critical velocity of 476±37  km/s ; the polar axis is inclined by 64°±16°. [6] This is a known Be star [12] that began behaving as a normal star in November, 1982. [13] It has 6.4 times the mass of the Sun and is radiating around 1,442 times the Sun's luminosity from its photosphere at an effective temperature of 17,090  K . [6]

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Merope, designated 23 Tauri, is a star in the constellation of Taurus and a member of the Pleiades star cluster. It is approximately 440 light-years (135 pc) away.

22 Aurigae is a star located 537 light years away from the Sun in the northern constellation Auriga. It is just bright enough to be barely visible to the naked eye under good viewing conditions, appearing as a blue-white hued star with an apparent visual magnitude of 6.45. At the distance of this object, the brightness is diminished by an extinction of 0.57 due to interstellar dust. The star is moving further from the Earth with a heliocentric radial velocity of +10 km/s, and it is a member of the Taurion OB association, located between Orion and Taurus.

Theta<sup>1</sup> Orionis C Multiple star in the constellation Orion

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<span class="mw-page-title-main">23 Vulpeculae</span> Star in the constellation Vulpecula

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15 Orionis is a suspected astrometric binary star system in the equatorial constellation of Orion, near the border with Taurus. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 4.82. The system is approximately 340 light years away from the Sun based on parallax. It is moving further from the Earth with a heliocentric radial velocity of +29 km/s, having come to within 69 light-years some three million years ago.

<span class="mw-page-title-main">11 Lacertae</span> Star in the constellation Lacerta

11 Lacertae is a star in the northern constellation of Lacerta. It is visible to the naked eye as a faint orange-hued star with an apparent visual magnitude of 4.46. It lies at a distance of about 333 light years and has an absolute magnitude -0.54. The object is moving closer to the Earth with a heliocentric radial velocity of −10.9 km/s.

<span class="mw-page-title-main">Mu Ophiuchi</span> Star in the constellation Ophiuchus

μ Ophiuchi, Latinized as Mu Ophiuchi, is a solitary, blue-white hued star in the equatorial constellation of Ophiuchus. It is visible to the naked as a faint point of light with an apparent visual magnitude of 4.62. This object is located approximately 760 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −18.5 km/s.

<span class="mw-page-title-main">Gamma Monocerotis</span> Star in the constellation of Monoceros

γ Monocerotis, Latinised as Gamma Monocerotis, is a binary star system in the equatorial constellation of Monoceros. Based upon an annual parallax shift of 6.55 mas, it is located roughly 500 light years from the Sun. It can be viewed with the naked eye, having an apparent visual magnitude of 3.96. Gamma Monocerotis is moving away from the Sun with a radial velocity of −5 km/s.

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

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

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90 Tauri is a star in the zodiac constellation of Taurus, located 144 light-years away from the Sun. It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.27. 90 Tauri is a member of the Hyades cluster and is listed as a double star.

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

Sigma Ophiuchi, Latinized from σ Ophiuchi, is a single, orange-hued star in the equatorial constellation Ophiuchus. Its apparent visual magnitude is 4.31, which is bright enough to be faintly visible to the naked eye. The annual parallax shift of 3.62 mas as seen from Earth provides a distance estimate of roughly 900 light years. It is moving closer to the Sun with a radial velocity of −28 km/s.

<span class="mw-page-title-main">29 Orionis</span> Aging giant star in the constellation of Orion

29 Orionis is a single star located around 157 light years away from the Sun in the equatorial constellation of Orion. In Bayer's Uranometria, this star is one of two stars marking the top of Orion's right boot. It has the Bayer designation e Orionis, while 29 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 4.13. It is moving closer to the Earth with a heliocentric radial velocity of -18 km/s.

<span class="mw-page-title-main">32 Orionis</span> Triple star system in the constellation Orion

32 Orionis is a triple star system in the equatorial constellation of Orion. It has the Bayer designation A Orionis, while 32 Orionis is the Flamsteed designation. This system is visible to the naked eye as a faint point of light with a combined apparent visual magnitude of 4.20. It is located approximately 303 light-years away from the Sun based on parallax, and is drifting further away with a radial velocity of +18.6 km/s.

<span class="mw-page-title-main">42 Orionis</span> Star in the constellation of Orion

42 Orionis is a class B1V star in the constellation Orion. Its apparent magnitude is 4.59 and it is approximately 900 light years away based on parallax.

<span class="mw-page-title-main">49 Orionis</span> Star in the constellation Orion

49 Orionis is a single star in the equatorial constellation of Orion. It has the Bayer designation d Orionis, while 49 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.80. It is located 141 light years away from the Sun based on parallax, but is drifting closer with a radial velocity of −5 km/s.

<span class="mw-page-title-main">51 Orionis</span> Star in the constellation of Orion

51 Orionis is a single star in the equatorial constellation of Orion. It has the Bayer designation b Orionis, while 51 Orionis is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.90. It is located approximately 299 light-years away from the Sun based on parallax, and is drifting further away with a radial velocity of +88 km/s.

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

ν Pegasi, Latinized as Nu Pegasi is a single star in the northern constellation of Pegasus. It is an orange-hued star that is faintly visible to the naked eye with an apparent visual magnitude of 4.84. The star is located approximately 261 light years away based on parallax, but is drifting closer with a radial velocity of −19 km/s.

References

  1. 1 2 3 4 5 6 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv: 0708.1752 . Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID   18759600.
  2. 1 2 3 4 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 Lesh, Janet Rountree (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". Astrophysical Journal Supplement. 17: 371. Bibcode:1968ApJS...17..371L. doi: 10.1086/190179 .
  4. 1 2 Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
  5. ↑ 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. Vizier catalog entry
  6. 1 2 3 Zorec, J.; et al. (2016). "Critical study of the distribution of rotational velocities of Be stars". Astronomy & Astrophysics. 595: A132. Bibcode:2016A&A...595A.132Z. doi: 10.1051/0004-6361/201628760 .
  7. ↑ 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.
  8. ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv: 1606.08814 . Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID   118345778. Vizier catalog entry
  9. 1 2 Bouy, H.; Alves, J. (December 2015). "Cosmography of OB stars in the solar neighbourhood". Astronomy & Astrophysics. 584: 13. Bibcode:2015A&A...584A..26B. doi: 10.1051/0004-6361/201527058 . A26.
  10. ↑ "69 Ori". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2018-08-06.
  11. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv: 0806.2878 . Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID   14878976.
  12. ↑ Bossi, M.; et al. (November 1981). "Spectroscopic and photometric observations of the Be star 69 Orionis". Astronomy and Astrophysics Supplement Series. 46: 173–177. Bibcode:1981A&AS...46..173B.
  13. ↑ Goraya, P. S.; Tur, N. S. (February 1996). "Spectrophotometric Study of Four Bright Be Stars". Astrophysics and Space Science. 236 (2): 175–183. Bibcode:1996Ap&SS.236..175G. doi:10.1007/BF00645142. S2CID   123576634.
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