| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 22h 33m 00.06240s [2] |
| Declination | −61° 58′ 55.6390″ [2] |
| Apparent magnitude (V) | 4.75 - 4.93 [3] |
| Characteristics | |
| Spectral type | M4 III [4] |
| U−B color index | +1.73 [5] |
| B−V color index | +1.61 [5] |
| Variable type | Lb: [6] |
| Astrometry | |
| Radial velocity (Rv) | −3.4±0.8 [7] km/s |
| Proper motion (μ) |
RA: −3.40
[2]
mas/
yr Dec.: −0.8 [2] mas/ yr |
| Parallax (π) | 11.24 ± 0.23 mas [2] |
| Distance | 290 ± 6
ly (89 ± 2 pc) |
| Absolute magnitude (MV) | +0.16 [8] |
| Details | |
| Radius | 64.37 [9] R☉ |
| Luminosity | 554±41 [9] L☉ |
| Surface gravity (log g) | 0.778 [9] cgs |
| Temperature | 3472±125 [9] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
ν Tucanae, Latinized as Nu Tucanae, is a solitary, [11] variable star in the southern constellation of Tucana. This red-hued object is visible to the naked eye as a faint star with an apparent visual magnitude that fluctuates around +4.80. [5] It is located approximately 290 light years from the Sun based on parallax, [2] but is drifting closer with a radial velocity of −3 km/s. [7]
This object is an aging red giant with a stellar classification of M4 III, [4] currently on the asymptotic giant branch. [6] With the supply of hydrogen exhausted at its core, the star has cooled and expanded off the main sequence; at present it has 49 times the Sun's radius. [12] It is classified as a slow irregular variable and its brightness varies from magnitude +4.75 to +4.93. [3] Cyclical periods of 22.3, 24.4, 24.8, 25.1, 25.5, 33.8, 50.6, 80.1, 123.2, and 261.8 days have been reported for its variations. [13] On average, the star is radiating around 400 [12] times the luminosity of the Sun from its photosphere at an effective temperature of 3,674 K. [12]
References
- ^ "Hipparcos Tools Interactive Data Access", Hipparcos, ESA, retrieved 8 December 2021.
- ^ 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.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009), "General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1, Bibcode: 2009yCat....102025S.
- ^ a b Houk, Nancy (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.
- ^ a b c Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa, 23: 175, Bibcode: 1964MNSSA..23..175C.
- ^ a b Sloan, G. C.; Price, S. D. (December 1998), "The Infrared Spectral Classification of Oxygen-rich Dust Shells", The Astrophysical Journal Supplement Series, 119 (2): 141–158, Bibcode: 1998ApJS..119..141S, doi: 10.1086/313156.
- ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053, Bibcode: 2006AstL...32..759G, doi: 10.1134/S1063773706110065, S2CID 119231169.
- ^ 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 c d McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471: 770–791, arXiv: 1706.02208, doi: 10.1093/mnras/stx1433, ISSN 0035-8711 Nu Tucanae's database entry at VizieR.
- ^ "nu Tuc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-04.
- ^ 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.
- ^ a b c 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.
- ^ Tabur, V.; Bedding, T. R.; et al. (2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945, arXiv: 0908.3228, Bibcode: 2009MNRAS.400.1945T, doi: 10.1111/j.1365-2966.2009.15588.x, S2CID 15358380.
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| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 22h 33m 00.06240s [2] |
| Declination | −61° 58′ 55.6390″ [2] |
| Apparent magnitude (V) | 4.75 - 4.93 [3] |
| Characteristics | |
| Spectral type | M4 III [4] |
| U−B color index | +1.73 [5] |
| B−V color index | +1.61 [5] |
| Variable type | Lb: [6] |
| Astrometry | |
| Radial velocity (Rv) | −3.4±0.8 [7] km/s |
| Proper motion (μ) |
RA: −3.40
[2]
mas/
yr Dec.: −0.8 [2] mas/ yr |
| Parallax (π) | 11.24 ± 0.23 mas [2] |
| Distance | 290 ± 6
ly (89 ± 2 pc) |
| Absolute magnitude (MV) | +0.16 [8] |
| Details | |
| Radius | 64.37 [9] R☉ |
| Luminosity | 554±41 [9] L☉ |
| Surface gravity (log g) | 0.778 [9] cgs |
| Temperature | 3472±125 [9] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
ν Tucanae, Latinized as Nu Tucanae, is a solitary, [11] variable star in the southern constellation of Tucana. This red-hued object is visible to the naked eye as a faint star with an apparent visual magnitude that fluctuates around +4.80. [5] It is located approximately 290 light years from the Sun based on parallax, [2] but is drifting closer with a radial velocity of −3 km/s. [7]
This object is an aging red giant with a stellar classification of M4 III, [4] currently on the asymptotic giant branch. [6] With the supply of hydrogen exhausted at its core, the star has cooled and expanded off the main sequence; at present it has 49 times the Sun's radius. [12] It is classified as a slow irregular variable and its brightness varies from magnitude +4.75 to +4.93. [3] Cyclical periods of 22.3, 24.4, 24.8, 25.1, 25.5, 33.8, 50.6, 80.1, 123.2, and 261.8 days have been reported for its variations. [13] On average, the star is radiating around 400 [12] times the luminosity of the Sun from its photosphere at an effective temperature of 3,674 K. [12]
References
- ^ "Hipparcos Tools Interactive Data Access", Hipparcos, ESA, retrieved 8 December 2021.
- ^ 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.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009), "General Catalogue of Variable Stars (Samus+ 2007-2013)", VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S, 1, Bibcode: 2009yCat....102025S.
- ^ a b Houk, Nancy (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.
- ^ a b c Cousins, A. W. J. (1964), "Photometric Data for Stars in the Equatorial Zone (Seventh List)", Monthly Notes of the Astronomical Society of Southern Africa, 23: 175, Bibcode: 1964MNSSA..23..175C.
- ^ a b Sloan, G. C.; Price, S. D. (December 1998), "The Infrared Spectral Classification of Oxygen-rich Dust Shells", The Astrophysical Journal Supplement Series, 119 (2): 141–158, Bibcode: 1998ApJS..119..141S, doi: 10.1086/313156.
- ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv: 1606.08053, Bibcode: 2006AstL...32..759G, doi: 10.1134/S1063773706110065, S2CID 119231169.
- ^ 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 c d McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017-10-01), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471: 770–791, arXiv: 1706.02208, doi: 10.1093/mnras/stx1433, ISSN 0035-8711 Nu Tucanae's database entry at VizieR.
- ^ "nu Tuc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-04.
- ^ 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.
- ^ a b c 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.
- ^ Tabur, V.; Bedding, T. R.; et al. (2009), "Long-term photometry and periods for 261 nearby pulsating M giants", Monthly Notices of the Royal Astronomical Society, 400 (4): 1945, arXiv: 0908.3228, Bibcode: 2009MNRAS.400.1945T, doi: 10.1111/j.1365-2966.2009.15588.x, S2CID 15358380.
| Stars |
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Star clusters |
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| Galaxies |
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