| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 22h 27m 19.96745s [1] |
| Declination | −64° 57′ 58.8775″ [1] |
| Apparent magnitude (V) | +4.48 [2] (A: 4.52, B: 8.85) [3] |
| Characteristics | |
| Spectral type | B9 Vn + G0 V Fe−2 [3] |
| U−B color index | A: −0.07, B: −0.02 [3] |
| B−V color index | A: −0.02, B: +0.51 [3] |
| Astrometry | |
| Proper motion (μ) |
RA: +68.45
[1]
mas/
yr Dec.: +10.06 [1] mas/ yr |
| Parallax (π) | 13.00 ± 0.48 mas [1] |
| Distance | 251 ± 9
ly (77 ± 3 pc) |
| Absolute magnitude (MV) | A: 0.20, B: 4.50 [3] |
| Details | |
| δ Tuc A | |
| Mass | 2.99 [4] M☉ |
| Radius | 2.7 [5] R☉ |
| Surface gravity (log g) | 4.11±0.14 [4] cgs |
| Temperature | 11,271±383 [4] K |
| Rotation | 2.8535 [6] d |
| Rotational velocity (v sin i) | 224 [7] km/s |
| Age | 232 [4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Tucanae (δ Tuc, δ Tucanae) is a common proper motion [3] pair located in the southwestern corner of the southern constellation of Tucana. [9] Based upon an annual parallax shift of 13.00 mas as seen from Earth, is approximately 250 light years from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of +4.48. [2] As of 2013, the two components had an angular separation of 7.0 arc seconds along a position angle of 282°. [10]
The brighter primary, component A, is blue-white hued star a visual magnitude of 4.52. [3] It is a B-type main-sequence star with a stellar classification of B9 Vn, [3] where the 'n' suffix indicates "nebulous" absorption lines due to the star's rotation. It is spinning rapidly with a projected rotational velocity of 224 km/s, [7] which is giving the star an oblate shape with an equatorial bulge that is an estimated 12% larger than the polar radius. [11] The star has about three times the mass of the Sun and is around 232 million years old. [4]
The magnitude 8.85 [3] companion, component B, is a G-type main-sequence star. It has a classification of G0 V Fe−2, [3] with the suffix indicating an underabundance of iron in the star's photosphere.
- ^ a b c d e 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 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode: 1978A&AS...34....1N.
- ^ a b c d e f g h i j Corbally, C. J. (1984), "Close visual binaries. I - MK classifications", Astrophysical Journal Supplement Series, 55: 657, Bibcode: 1984ApJS...55..657C, doi: 10.1086/190973.
- ^ a b c d e 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.
- ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ Barraza, L. F.; Gomes, R. L.; Messias, Y. S.; Leão, I. C.; Almeida, L. A.; Janot-Pacheco, E.; Brito, A. C.; Brito, F. A. C.; Santana, J. V.; Gonçalves, N. S.; Das Chagas, M. L.; Teixeira, M. A.; De Medeiros, J. R.; Canto Martins, B. L. (2022). "Rotation Signature of TESS B-type Stars. A Comprehensive Analysis". The Astrophysical Journal. 924 (2): 117. arXiv: 2202.01022. Bibcode: 2022ApJ...924..117B. doi: 10.3847/1538-4357/ac3335. S2CID 246030494.
- ^ a b Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv: astro-ph/0205255, Bibcode: 2002A&A...393..897R, doi: 10.1051/0004-6361:20020943, S2CID 14070763.
-
^
"del Tuc".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-04-22.
{{ cite web}}: CS1 maint: postscript ( link) - ^ Streicher, Magda (2005), "Deepsky Delights", Monthly Notes of the Astronomical Society of Southern Africa, 64 (9–10): 172–74, Bibcode: 1907GOAMM..67G...2C.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920.
- ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv: 1204.2572, Bibcode: 2012A&ARv..20...51V, doi: 10.1007/s00159-012-0051-2, S2CID 119273474.
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| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Tucana |
| Right ascension | 22h 27m 19.96745s [1] |
| Declination | −64° 57′ 58.8775″ [1] |
| Apparent magnitude (V) | +4.48 [2] (A: 4.52, B: 8.85) [3] |
| Characteristics | |
| Spectral type | B9 Vn + G0 V Fe−2 [3] |
| U−B color index | A: −0.07, B: −0.02 [3] |
| B−V color index | A: −0.02, B: +0.51 [3] |
| Astrometry | |
| Proper motion (μ) |
RA: +68.45
[1]
mas/
yr Dec.: +10.06 [1] mas/ yr |
| Parallax (π) | 13.00 ± 0.48 mas [1] |
| Distance | 251 ± 9
ly (77 ± 3 pc) |
| Absolute magnitude (MV) | A: 0.20, B: 4.50 [3] |
| Details | |
| δ Tuc A | |
| Mass | 2.99 [4] M☉ |
| Radius | 2.7 [5] R☉ |
| Surface gravity (log g) | 4.11±0.14 [4] cgs |
| Temperature | 11,271±383 [4] K |
| Rotation | 2.8535 [6] d |
| Rotational velocity (v sin i) | 224 [7] km/s |
| Age | 232 [4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Tucanae (δ Tuc, δ Tucanae) is a common proper motion [3] pair located in the southwestern corner of the southern constellation of Tucana. [9] Based upon an annual parallax shift of 13.00 mas as seen from Earth, is approximately 250 light years from the Sun. It is visible to the naked eye with a combined apparent visual magnitude of +4.48. [2] As of 2013, the two components had an angular separation of 7.0 arc seconds along a position angle of 282°. [10]
The brighter primary, component A, is blue-white hued star a visual magnitude of 4.52. [3] It is a B-type main-sequence star with a stellar classification of B9 Vn, [3] where the 'n' suffix indicates "nebulous" absorption lines due to the star's rotation. It is spinning rapidly with a projected rotational velocity of 224 km/s, [7] which is giving the star an oblate shape with an equatorial bulge that is an estimated 12% larger than the polar radius. [11] The star has about three times the mass of the Sun and is around 232 million years old. [4]
The magnitude 8.85 [3] companion, component B, is a G-type main-sequence star. It has a classification of G0 V Fe−2, [3] with the suffix indicating an underabundance of iron in the star's photosphere.
- ^ a b c d e 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 Nicolet, B. (1978), "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System", Astronomy and Astrophysics Supplement Series, 34: 1–49, Bibcode: 1978A&AS...34....1N.
- ^ a b c d e f g h i j Corbally, C. J. (1984), "Close visual binaries. I - MK classifications", Astrophysical Journal Supplement Series, 55: 657, Bibcode: 1984ApJS...55..657C, doi: 10.1086/190973.
- ^ a b c d e 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.
- ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID 425754.
- ^ Barraza, L. F.; Gomes, R. L.; Messias, Y. S.; Leão, I. C.; Almeida, L. A.; Janot-Pacheco, E.; Brito, A. C.; Brito, F. A. C.; Santana, J. V.; Gonçalves, N. S.; Das Chagas, M. L.; Teixeira, M. A.; De Medeiros, J. R.; Canto Martins, B. L. (2022). "Rotation Signature of TESS B-type Stars. A Comprehensive Analysis". The Astrophysical Journal. 924 (2): 117. arXiv: 2202.01022. Bibcode: 2022ApJ...924..117B. doi: 10.3847/1538-4357/ac3335. S2CID 246030494.
- ^ a b Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv: astro-ph/0205255, Bibcode: 2002A&A...393..897R, doi: 10.1051/0004-6361:20020943, S2CID 14070763.
-
^
"del Tuc".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2017-04-22.
{{ cite web}}: CS1 maint: postscript ( link) - ^ Streicher, Magda (2005), "Deepsky Delights", Monthly Notes of the Astronomical Society of Southern Africa, 64 (9–10): 172–74, Bibcode: 1907GOAMM..67G...2C.
- ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode: 2001AJ....122.3466M, doi: 10.1086/323920.
- ^ Belle, G. T. (2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv: 1204.2572, Bibcode: 2012A&ARv..20...51V, doi: 10.1007/s00159-012-0051-2, S2CID 119273474.
| Stars |
| ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||
|
Star clusters |
| ||||||||||
| |||||||||||
| Galaxies |
| ||||||||||