HD 80230

Last updated
HD 80230
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Carina
Right ascension 09h 16m 12.07286s [1]
Declination −57° 32′ 29.3007″ [1]
Apparent magnitude  (V)4.34 [2]
Characteristics
Spectral type M0.5IIIa [3]
B−V color index +1.602±0.079 [2]
Variable type Suspected [4]
Astrometry
Radial velocity (Rv)−5.2±0.7 [2]  km/s
Proper motion (μ)RA: −27.15 [1]   mas/yr
Dec.: −14.18 [1]   mas/yr
Parallax (π)6.68 ± 0.15  mas [1]
Distance 490 ± 10  ly
(150 ± 3  pc)
Absolute magnitude  (MV)−1.53 [2]
Details
Mass 2.2±0.3 [5]   M☉
Radius 74.86+3.84
−5.71 [6]   R☉
Luminosity 1,172±60 [6]   L☉
Surface gravity (log g)0.95±0.12 [5]   cgs
Temperature 3,904+158
−96 [6]   K
Other designations
g Car, NSV  4440, CPD−57°1961, GC  12813, HD  80230, HIP  45496, HR  3696, SAO  236787 [7]
Database references
SIMBAD data

HD 80230 is a single [8] star in the southern constellation of Carina, near the northern constellation border with Vela. It has the Bayer designation g Carinae, while HD 80230 is the star's identifier in the Henry Draper catalogue . This is a suspected variable star with a brightness that has been measured varying from magnitude 4.31 down to 4.35, [4] both of which is bright enough for the star to be visible to the naked eye. The distance to this object is approximately 490  light years based on parallax, [1] but it is drifting closer to the Sun with a radial velocity of −5 km/s. [2]

This object is an aging red giant, currently on the asymptotic giant branch, [9] with a stellar classification of M0.5IIIa. [3] It is a mild barium star, showing trace enhancement of s-process elements in its spectrum. [10] The star has 2.2 [5] times the mass of the Sun and has expanded to 75 [6] times the Sun's radius. It is radiating 1,172 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,904 K. [6]

Related Research Articles

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HD 30442 is a solitary star in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye with an apparent magnitude of 5.47 and is estimated to be 403 light years away from the Solar System. The object has a heliocentric radial velocity of −37 km/s, indicating that it is drifting closer.

63 Cygni is a single star in the northern constellation of Cygnus, located around 1,030 light years away from Sun. It is visible to the naked eye as an orange-hued star with an apparent visual magnitude of 4.56. 63 Cyg is moving closer to the Earth with a heliocentric radial velocity of −26 km/s.

HD 189276 is a single star in the northern constellation Cygnus, positioned near the northern constellation border with Draco. It has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.98. The star is located at a distance of approximately 820 light years from the Sun based on parallax, and it has an absolute magnitude of −2.25. It is drifting further away with a radial velocity of +4 km/s. The star has a high peculiar velocity of 38.5+1.8
−2.2 km/s and thus is a probable runaway star.

<span class="mw-page-title-main">18 Draconis</span> Star in the constellation Draco

18 Draconis is a likely binary star system in the northern circumpolar constellation of Draco. With an apparent visual magnitude of 4.84, it is just bright enough to be faintly visible to the naked eye. The distance to this system, as estimated from an annual parallax shift of 4.5 mas, is roughly 720 light years. It is moving closer to the Sun with a heliocentric radial velocity of −1.4 km/s, and is a probable member of the Sirius stream of co-moving stars.

HD 20644 is a suspected binary star system in the constellation Aries. It has an orange hue and is visible to the naked eye with an apparent visual magnitude of 4.47. The system is located at a distance of approximately 540 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −3 km/s.

98 Herculis is a single star located approximately 590 light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude of 4.96. The brightness of the star is diminished by an extinction of 0.19 due to interstellar dust. The star is moving closer to the Earth with a heliocentric radial velocity of −19 km/s.

32 Ophiuchi is a single star located 410 light years away from the Sun in the constellation Hercules. It is visible to the naked eye as a dim, red-hued star with an apparent visual magnitude of 4.97. This is an aging red giant star on the asymptotic giant branch with a stellar classification of M3−III. Having exhausted the supply of hydrogen at its core it has expanded to 60 times the girth of the Sun. The star is radiating 614 times the luminosity of the Sun from its swollen photosphere at an effective temperature of around 3,712 K. It is moving further away from the Sun with a heliocentric radial velocity of +43 km/s.

HD 85859 is a single star in the equatorial constellation of Hydra. It has an apparent visual magnitude of 4.88, which is bright enough to be visible to the naked eye. The distance to this star, as estimated from its annual parallax shift of 12.6 mas, is 259 light years. It is moving away from the Earth with a heliocentric radial velocity of 50.5 km/s.

HD 77912 is a single star in the northern constellation of Lynx. It is visible to the naked eye with an apparent visual magnitude of 4.56. The star is located 650 light years from the Sun, as determined from its annual parallax shift of 5.0 mas. It is moving further away with a heliocentric radial velocity of +16.6 km/s. HD 77912 has a peculiar velocity of 23.1+2.9
−1.1 km/s, which may mark it as a runaway star.

7 Piscium is a single star in the zodiac constellation of Pisces, located around 343 light-years away from the Sun. It has the Bayer designation b Piscium; 7 Piscium is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.07. It is moving further from the Earth with a heliocentric radial velocity of 40 km/s.

HR 6135 is single star in the southern constellation of Apus, less than a degree from the northern constellation border with Triangulum Australe. Its declination of −70° 59.3′ puts it just within 20 degrees of the southern celestial pole. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude of 5.50, making it the 12th-brightest star in the constellation. It is located at a distance of approximately 1,000 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −9.5 km/s. It has an absolute magnitude of −1.45.

HR 5401 is a possible astrometric binary star system in the southern constellation of Lupus. With an apparent visual magnitude of 5.83, it is just visible to the naked eye under good seeing conditions. The distance to HR 5401 can be estimated from its annual parallax shift of 15.9 mas, yielding a range of 205 light years. It is moving closer to Earth with a heliocentric radial velocity of −30 km/s, and is expected to come within 161 ly in ~524,000 years.

HD 2454 is a probable binary star system in the zodiac constellation of Pisces. With an apparent visual magnitude of 6.04, it is near the lower limit of visibility to the naked eye under good seeing conditions. An annual parallax shift of 26.3 mas as measured from Earth's orbit provides a distance estimate of 124 light years. It has a relatively high proper motion, traversing the celestial sphere at a rate of 0.208 arcseconds per year, and is moving closer to the Sun with a heliocentric radial velocity of −10 km/s.

HD 179886 is a binary star located in the southern constellation Telescopium. It has a combined apparent magnitude of 5.37, making it faintly visible to the naked eye if viewed under ideal conditions. The system is situated at a distance of 700 light years but is receding with a heliocentric radial velocity of 6.3 km/s.

HD 200044 is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 5.7, allowing it to be faintly seen with the naked eye. The object is located 598 light years away, but is approaching the Solar System with a heliocentric radial velocity of −15.07 km/s.

HD 120213 is a solitary star in the southern circumpolar constellation Chamaeleon. It is faintly visible to the naked eye with an apparent magnitude of 5.94 and is estimated to be 910 light years away from the Solar System. However, the object is drifting closer with a heliocentric radial velocity of −35 km/s.

HD 198404 is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.19, allowing it to be faintly seen with the naked eye. Parallax measurements place the object at a distance of 395 light years and it is approaching the Solar System with a heliocentric radial velocity of −21.6 km/s.

HD 58425, also known as HR 2830, is an astrometric binary located in the northern circumpolar constellation Camelopardalis. It is faintly visible to the naked eye as an orang point of light at an apparent magnitude of 5.64. Based on parallax measurements from Gaia DR3, the system is estimated to be 470 light years away from Earth. It appears to be rapidly receding from the Sun, having a heliocentric radial velocity of 58.6 km/s. HD 58425 is listed as 54 Ursae Majoris in Johann Hevelius' catalogue, but this was dropped after the official IAU's official constellation borders were drawn.

<span class="mw-page-title-main">HD 22764</span> Double star; Camelopardalis

HD 22764, also known as HR 1112, is an orange hued star located in the northern circumpolar constellation Camelopardalis. It has an apparent magnitude of 5.78, allowing it to be faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,770 light years based on Gaia DR3 parallax measurements but is approaching the Solar System with a heliocentric radial velocity of −12.5 km/s. At its current distance, HD 22764's brightness is diminished by 0.66 magnitudes due to interstellar dust.

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 .
  2. 1 2 3 4 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
  3. 1 2 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. 1 2 Samus', N. N.; et al. (2017), "General catalogue of variable stars", Astronomy Reports, 5.1, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  5. 1 2 3 Kallinger, T.; et al. (April 2019), "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation", Astronomy & Astrophysics, 624: 17, arXiv: 1902.07531 , Bibcode:2019A&A...624A..35K, doi:10.1051/0004-6361/201834514, S2CID   102486794, A35.
  6. 1 2 3 4 5 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 . Gaia DR2 record for this source at VizieR.
  7. ↑ "HD 80230". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-26.
  8. ↑ 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, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID   14878976.
  9. ↑ Eggen, Olin J. (July 1992), "Asymptotic giant branch stars near the sun", Astronomical Journal, 104 (1): 275–313, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
  10. ↑ Lu, Phillip K. (June 1991), "Taxonomy of Barium Stars", Astronomical Journal, 101: 2229, Bibcode:1991AJ....101.2229L, doi:10.1086/115845.
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