| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 53m 26.20s [1] |
| Declination | −40° 10′ 43.9″ [1] |
| Apparent magnitude (V) | +4.25 [2] |
| Characteristics | |
| Spectral type | A7IV [3] or A7V [4] |
| B−V color index | +0.224±0.014 [2] |
| Astrometry | |
| Proper motion (μ) |
RA: +70.84±0.14
[1]
mas/
yr Dec.: −22.54±0.10 [1] mas/ yr |
| Parallax (π) | 21.95 ± 0.19 mas [1] |
| Distance | 149 ± 1
ly (45.6 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.86 [5] |
| Details | |
| Mass | 1.62 [6] M☉ |
| Luminosity | 34.34 [2] L☉ |
| Surface gravity (log g) | 3.87±0.14 [6] cgs |
| Temperature | 7,835±266 [6] K |
| Rotational velocity (v sin i) | 92.4±4.6 [5] km/s |
| Age | 401 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 111968, also known by the Bayer designation n Centauri, is a single [8] star in the southern constellation of Centaurus. It is a white-hued star that is faintly visible to the naked eye with an apparent visual magnitude of +4.25. [2] The star is located at a distance of approximately 149 light years from the Sun based on parallax. [1] The radial velocity of the star is poorly constrained, with an estimated value of 2.5 km/s. [2]
This is classified as an A-type star but there has been disagreement about the luminosity class. A. de Vaucouleurs in 1957 found a class of III, suggesting this is an evolved giant star. [9] O. J. Eggen gave a class of V in 1962, [10] as did R. O. Gray and R. F. Garrison in 1989, [4] indicating this is a main sequence star. In 1979, N. Houk found a class of IV, [3] meaning this is a subgiant star.
HD 111968 is a young star, some 400 million years old, with 1.6 times the mass of the Sun. [6] It is spinning with a projected rotational velocity of 92 km/s. [5] The star is radiating 34 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 7,835 K. [6]
References
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d e f 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.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ^ a b Gray, R. O.; Garrison, R. F. (1989), "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", The Astrophysical Journal Supplement Series, 70: 623, Bibcode: 1989ApJS...70..623G, doi: 10.1086/191349.
- ^ a b c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv: 1204.2459, Bibcode: 2012A&A...542A.116A, doi: 10.1051/0004-6361/201118724, S2CID 53666672.
- ^ a b c d e f 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: 10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "n Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-01.
- ^ 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.
- ^ de Vaucouleurs, A. (1957). "Spectral types and luminosities of B, A and F southern stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449. Bibcode: 1957MNRAS.117..449D. doi: 10.1093/mnras/117.4.449.
- ^ Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode: 1962RGOB...51...79E.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 12h 53m 26.20s [1] |
| Declination | −40° 10′ 43.9″ [1] |
| Apparent magnitude (V) | +4.25 [2] |
| Characteristics | |
| Spectral type | A7IV [3] or A7V [4] |
| B−V color index | +0.224±0.014 [2] |
| Astrometry | |
| Proper motion (μ) |
RA: +70.84±0.14
[1]
mas/
yr Dec.: −22.54±0.10 [1] mas/ yr |
| Parallax (π) | 21.95 ± 0.19 mas [1] |
| Distance | 149 ± 1
ly (45.6 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.86 [5] |
| Details | |
| Mass | 1.62 [6] M☉ |
| Luminosity | 34.34 [2] L☉ |
| Surface gravity (log g) | 3.87±0.14 [6] cgs |
| Temperature | 7,835±266 [6] K |
| Rotational velocity (v sin i) | 92.4±4.6 [5] km/s |
| Age | 401 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 111968, also known by the Bayer designation n Centauri, is a single [8] star in the southern constellation of Centaurus. It is a white-hued star that is faintly visible to the naked eye with an apparent visual magnitude of +4.25. [2] The star is located at a distance of approximately 149 light years from the Sun based on parallax. [1] The radial velocity of the star is poorly constrained, with an estimated value of 2.5 km/s. [2]
This is classified as an A-type star but there has been disagreement about the luminosity class. A. de Vaucouleurs in 1957 found a class of III, suggesting this is an evolved giant star. [9] O. J. Eggen gave a class of V in 1962, [10] as did R. O. Gray and R. F. Garrison in 1989, [4] indicating this is a main sequence star. In 1979, N. Houk found a class of IV, [3] meaning this is a subgiant star.
HD 111968 is a young star, some 400 million years old, with 1.6 times the mass of the Sun. [6] It is spinning with a projected rotational velocity of 92 km/s. [5] The star is radiating 34 [2] times the luminosity of the Sun from its photosphere at an effective temperature of 7,835 K. [6]
References
- ^ a b c d e f 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. Vizier catalog entry
- ^ a b c d e f 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.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1982mcts.book.....H.
- ^ a b Gray, R. O.; Garrison, R. F. (1989), "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", The Astrophysical Journal Supplement Series, 70: 623, Bibcode: 1989ApJS...70..623G, doi: 10.1086/191349.
- ^ a b c Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics, 542: A116, arXiv: 1204.2459, Bibcode: 2012A&A...542A.116A, doi: 10.1051/0004-6361/201118724, S2CID 53666672.
- ^ a b c d e f 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: 10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ "n Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-10-01.
- ^ 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.
- ^ de Vaucouleurs, A. (1957). "Spectral types and luminosities of B, A and F southern stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449. Bibcode: 1957MNRAS.117..449D. doi: 10.1093/mnras/117.4.449.
- ^ Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode: 1962RGOB...51...79E.
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