HD 76728

Last updated
HD 76728
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Carina
Right ascension 08h 55m 02.82822s [1]
Declination −60° 38′ 40.5998″ [1]
Apparent magnitude  (V)+3.84 [2]
Characteristics
Evolutionary stage Bright giant
Spectral type B8/9II [3]
B−V color index −0.104±0.006 [2]
Variable type Constant [4]
Astrometry
Radial velocity (Rv)+25.0±4.1 [2]  km/s
Proper motion (μ)RA: −28.18 [1]   mas/yr
Dec.: +41.48 [1]   mas/yr
Parallax (π)10.20 ± 0.10  mas [1]
Distance 320 ± 3  ly
(98.0 ± 1.0  pc)
Absolute magnitude  (MV)−1.12 [2]
Details
Radius 5.0 [5]   R☉
Luminosity 449.05 [2]   L☉
Temperature 11,880 [5]   K
Other designations
c Car, CD−60°1243, FK5  336, GC  12359, HD  76728, HIP  43783, HR  3571, SAO  250374, CCDM J08550-6039, WDS J08550-6039A [6]
Database references
SIMBAD data

HD 76728 is a suspected astrometric binary [7] star system in the constellation Carina. It has the Bayer designation c Carinae; HD 76728 is the identifier from the Henry Draper catalogue . The visible component has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of +3.84. [2] The system is located at a distance of approximately 320  light years from the Sun based on parallax, [1] and it is drifting further away with a radial velocity of around +25 km/s. [2] It is a candidate member of the Volans-Carina Association of co-moving stars. [8]

The visible component is an aging bright giant star with a stellar classification of B8/9II. [3] The spectrum of the star displays metallic lines of magnesium. [9] The Volans-Carina Association to which it belongs has an age of 90 million years. [8] The star has five [5] times the radius of the Sun and is radiating 449 [2] times the Sun's luminosity from its photosphere at an effective temperature of 11,880 K. [5]

Related Research Articles

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<span class="mw-page-title-main">V343 Carinae</span> Star in the constellation Carina

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HD 80230 is a single 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, 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, but it is drifting closer to the Sun with a radial velocity of −5 km/s.

N Carinae is a single star in the constellation Carina, just to the northeast of the prominent star Canopus. This object has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.35. Based on parallax, it is located at a distance of approximately 1,360 light years from the Sun. It has an absolute magnitude of −3.75, and is drifting further away with a radial velocity of +22.5 km/s.

HD 91942 is a single variable star in the constellation Carina. It has the Bayer designation r Carinae, while HD 91942 is the identifier from the Henry Draper catalogue. This orange-hued object is visible to the naked eye with an apparent visual magnitude of 4.45. Based on parallax measurements, it is located at a distance of approximately 1,180 light years from the Sun. The star has an absolute magnitude of −3.77, and is drifting further away with a radial velocity of +9.9 km/s.

<span class="mw-page-title-main">V344 Carinae</span> Star in the constellation Carina

V344 Carinae is a single star in the southern constellation of Carina. It has the Bayer designation f Carinae, while V344 Carinae is its variable star designation. This star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around 4.50. Historically, it was mentioned in the Almagest, suggesting that some time around 130 BCE it was brighter than its current magnitude. This object is located at a distance of approximately 610 light-years from the Sun based on parallax. The star is drifting further away with a radial velocity of around +27 km/s.

HD 83944 is a star system in the constellation Carina. This has the Bayer designation m Carinae, while HD 83944 is the identifier from the Henry Draper catalogue. It is a suspected variable with an apparent visual magnitude that fluctuates around 4.51 with an amplitude of 0.5. The system is located at a distance of approximately 226 light years from the Sun based on parallax, and it has an absolute magnitude of 0.31. It is a member of the Carina association of co-moving stars.

<span class="mw-page-title-main">V520 Carinae</span> Star in the constellation Carina

V520 Carinae is a single star in the southern constellation of Carina. It has the Bayer designation w Carinae, while V520 Carinae is a variable star designation. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.58. It is located at a distance of approximately 1,140 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +9 km/s. It is a candidate member of the IC 2391 moving group of co-moving stars.

<span class="mw-page-title-main">V345 Carinae</span> Star in the constellation Carina

V345 Carinae is a star in the constellation Carina. It has the Bayer designation E Carinae; V345 Carinae is the variable star designation. The star has a blue-white hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.66. Its actual brightness varies from magnitude +4.67 to +4.78 with a period of 137.7 days. Based on parallax measurements, it is located at a distance of approximately 1,010 light years from the Sun. It is drifting further away with a radial velocity of around +19 km/s.

<span class="mw-page-title-main">V448 Carinae</span> Star in the constellation Carina

V448 Carinae is a single star in the constellation Carina. It has the Bayer designation O Carinae, while V448 Carinae is the variable star designation. This object has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.60. It is located at a distance of approximately 680 light years from the Sun based on parallax, and is drifting further away with a radial velocity of around +26 km/s.

1 Cassiopeiae is a single star in the northern constellation of Cassiopeia, located around 1,130 light years from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude of +4.84. This object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.

<span class="mw-page-title-main">HD 100673</span> Be star in the constellation Centaurus

A Centauri is a single 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. The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax. It appears to be drifting further away with a radial velocity of around +6 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 5 6 7 8 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 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
  4. ↑ Adelman, S. J.; et al. (September 2000), "On the Variability of O and B Supergiants", Information Bulletin on Variable Stars, 4946: 1, Bibcode:2000IBVS.4946....1A.
  5. 1 2 3 4 Underhill, A. B.; et al. (November 1979), "Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars", Monthly Notices of the Royal Astronomical Society , 189 (3): 601–605, Bibcode:1979MNRAS.189..601U, doi: 10.1093/mnras/189.3.601
  6. ↑ "HD 76728". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-01-20.
  7. ↑ 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
  8. 1 2 Gagné, Jonathan; et al. (October 2018), "Volans-Carina: A New 90 Myr Old Stellar Association at 85 pc", The Astrophysical Journal, 865 (2): 13, arXiv: 1808.04420 , Bibcode:2018ApJ...865..136G, doi: 10.3847/1538-4357/aadaed , S2CID   119402144, 136.
  9. ↑ Garrison, R. F.; Gray, R. O. (April 1994), "The Late B-Type Stars: Refined MK Classification, Confrontation With Stromgren Photometry, And The Effects of Rotation", Astronomical Journal, 107: 1556, Bibcode:1994AJ....107.1556G, doi:10.1086/116967.
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