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κ Doradus
Location of κ Doradus on the map (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Dorado
Right ascension 04h 44m 21.17834s [1]
Declination −59° 43′ 57.8563″ [1]
Apparent magnitude (V) 5.28 [2] (5.27 - 5.30) [3]
Characteristics
Spectral type A8 IV [4]
B−V color index +0.20 [5]
Variable type suspected δ Scuti [3]
Astrometry
Radial velocity (Rv)0.00±3.70 [6] km/s
Proper motion (μ) RA: +23.860  mas/ yr [1]
Dec.: +39.974  mas/ yr [1]
Parallax (π)14.8207 ± 0.0795  mas [1]
Distance220 ± 1  ly
(67.5 ± 0.4  pc)
Absolute magnitude (MV)+1.15 [7]
Details
Mass1.78+0.36
−0.20 [8]  M☉
Radius2.88+0.21
−0.19 [9]  R☉
Luminosity26.6 [10]  L☉
Surface gravity (log g)3.79±0.08 [9]  cgs
Temperature7,623±123 [11]  K
Metallicity [Fe/H]−0.18 [12]  dex
Rotational velocity (v sin i)230 [13] km/s
Other designations
κ Dor, 12 G. Doradus [14], NSV 16162, CPD−59°376, FK5 2354, GC 5810, HD 30478, HIP 22040, HR 1530, SAO 233664, TIC 220414802 [15]
Database references
SIMBAD data

Kappa Doradus, Latinized from κ Doradus, is a solitary star [16] located in the southern constellation Dorado. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.28. [2] The object is located relatively close at a distance of 220 light-years based on Gaia DR3 parallax measurements [1] and its distance from the Solar System is not changing, having a somewhat constrained heliocentric radial velocity of 0.00  km/s. [6] At its current distance, Kappa Doradus' brightness is diminished by two-tenths of a magnitude due to interstellar extinction [17] and it has an absolute magnitude of +1.15. [7]

The object has been given many different classes. Houk & Cowley (1975) gave a class of A8/9 III/IV, [18] indicating that it is an evolved A-type star with the characteristics of an A8 and A9 star and the blended luminosity class of a giant star and a subgiant. It has also been given a class of A8 IV and A5 III, [4] [19] indicating either a slightly evolved subgiant or an evolved giant star. Kappa Doradus has 1.78 times the mass of the Sun [8] and 2.88 times the radius of the Sun. [9] However, this is only its polar radius, as it has an equatorial bulge 26% greater than its polar radius. [20] It radiates 26.6 times the luminosity of the Sun [10] from its photosphere at an effective temperature of 7,623  K. [11] Kappa Doradus is metal deficient with an iron abundance 66.1% of the Sun's or [Fe/H] = −0.18. [12] Like many hot stars it spins rapidly, having a projected rotational velocity of 230  km/s, [13] which causes the aforementioned oblation. [20]

Kappa Doradus variability was first observed in 1981 by astronomer H. M. Matizen. [21] In the paper, it is used as a comparison star for Alpha Doradus. Matizen found out that Kappa Doradus show Delta Scuti-like amplitudes of 0.03 magnitudes in the visual passband within hours. [3] As of 2004 however, it has not been confirmed to be variable. [22]

References

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID  244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN  0004-6361. S2CID  17128864.
  3. ^ a b c Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. eISSN  1562-6881. ISSN  1063-7729. S2CID  125853869.
  4. ^ a b Gray, R. O.; Garrison, R. F. (July 1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". The Astrophysical Journal Supplement Series. 70: 623. Bibcode: 1989ApJS...70..623G. doi: 10.1086/191349. eISSN  1538-4365. ISSN  0067-0049. S2CID  121737313.
  5. ^ Lake, R. (1965). "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)". Monthly Notes of the Astronomical Society of South Africa. 24: 41. Bibcode: 1965MNSSA..24...41L. ISSN  0024-8266.
  6. ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv: 0705.0878. Bibcode: 2007AN....328..889K. doi: 10.1002/asna.200710776. eISSN  1521-3994. ISSN  0004-6337. S2CID  119323941.
  7. ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN  1562-6873. ISSN  1063-7737. S2CID  119257644.
  8. ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694. Bibcode: 2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467. eISSN  1538-3881. hdl: 1721.1/124721. S2CID  166227927.
  9. ^ a b c Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. ISSN  0004-6361. S2CID  13365201.
  10. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037. Bibcode: 2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x. eISSN  1365-2966. ISSN  0035-8711. S2CID  118665352.
  11. ^ a b Paunzen, E.; Schnell, A.; Maitzen, H. M. (October 2006). "An empirical temperature calibration for the Δa photometric system II: The A-type and mid F-type stars". Astronomy & Astrophysics. 458 (1): 293–296. arXiv: astro-ph/0607567. Bibcode: 2006A&A...458..293P. doi: 10.1051/0004-6361:20064889. eISSN  1432-0746. ISSN  0004-6361. S2CID  18219735.
  12. ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN  1432-0746. ISSN  0004-6361. S2CID  131780028.
  13. ^ a b Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode: 1953ApJ...118..285H. doi: 10.1086/145751. eISSN  1538-4357. ISSN  0004-637X. S2CID  120328179.
  14. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode: 1879RNAO....1.....G.
  15. ^ "* kap Dor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 3, 2023.
  16. ^ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN  1365-2966. ISSN  0035-8711. S2CID  14878976.
  17. ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN  1365-2966. ISSN  0035-8711. S2CID  118879856.
  18. ^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode: 1975mcts.book.....H.
  19. ^ Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN  0067-0049. S2CID  120495962.
  20. ^ a b van Belle, Gerard T. (14 March 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. eISSN  1432-0754. ISSN  0935-4956. S2CID  253689867.
  21. ^ Maitzen, H. M. (April 1981). "Variability of the Extreme Silicon Star alpha Dor = HD 29305". Information Bulletin on Variable Stars. 1950: 1. Bibcode: 1981IBVS.1950....1M. ISSN  0374-0676.
  22. ^ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode: 2004yCat.2250....0S.
Retrieved from " https://en.wikipedia.org/?title=Kappa_Doradus&oldid=1173994178"
From Wikipedia, the free encyclopedia
κ Doradus
Location of κ Doradus on the map (circled)
Observation data
Epoch J2000.0       Equinox J2000.0 ( ICRS)
Constellation Dorado
Right ascension 04h 44m 21.17834s [1]
Declination −59° 43′ 57.8563″ [1]
Apparent magnitude (V) 5.28 [2] (5.27 - 5.30) [3]
Characteristics
Spectral type A8 IV [4]
B−V color index +0.20 [5]
Variable type suspected δ Scuti [3]
Astrometry
Radial velocity (Rv)0.00±3.70 [6] km/s
Proper motion (μ) RA: +23.860  mas/ yr [1]
Dec.: +39.974  mas/ yr [1]
Parallax (π)14.8207 ± 0.0795  mas [1]
Distance220 ± 1  ly
(67.5 ± 0.4  pc)
Absolute magnitude (MV)+1.15 [7]
Details
Mass1.78+0.36
−0.20 [8]  M☉
Radius2.88+0.21
−0.19 [9]  R☉
Luminosity26.6 [10]  L☉
Surface gravity (log g)3.79±0.08 [9]  cgs
Temperature7,623±123 [11]  K
Metallicity [Fe/H]−0.18 [12]  dex
Rotational velocity (v sin i)230 [13] km/s
Other designations
κ Dor, 12 G. Doradus [14], NSV 16162, CPD−59°376, FK5 2354, GC 5810, HD 30478, HIP 22040, HR 1530, SAO 233664, TIC 220414802 [15]
Database references
SIMBAD data

Kappa Doradus, Latinized from κ Doradus, is a solitary star [16] located in the southern constellation Dorado. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.28. [2] The object is located relatively close at a distance of 220 light-years based on Gaia DR3 parallax measurements [1] and its distance from the Solar System is not changing, having a somewhat constrained heliocentric radial velocity of 0.00  km/s. [6] At its current distance, Kappa Doradus' brightness is diminished by two-tenths of a magnitude due to interstellar extinction [17] and it has an absolute magnitude of +1.15. [7]

The object has been given many different classes. Houk & Cowley (1975) gave a class of A8/9 III/IV, [18] indicating that it is an evolved A-type star with the characteristics of an A8 and A9 star and the blended luminosity class of a giant star and a subgiant. It has also been given a class of A8 IV and A5 III, [4] [19] indicating either a slightly evolved subgiant or an evolved giant star. Kappa Doradus has 1.78 times the mass of the Sun [8] and 2.88 times the radius of the Sun. [9] However, this is only its polar radius, as it has an equatorial bulge 26% greater than its polar radius. [20] It radiates 26.6 times the luminosity of the Sun [10] from its photosphere at an effective temperature of 7,623  K. [11] Kappa Doradus is metal deficient with an iron abundance 66.1% of the Sun's or [Fe/H] = −0.18. [12] Like many hot stars it spins rapidly, having a projected rotational velocity of 230  km/s, [13] which causes the aforementioned oblation. [20]

Kappa Doradus variability was first observed in 1981 by astronomer H. M. Matizen. [21] In the paper, it is used as a comparison star for Alpha Doradus. Matizen found out that Kappa Doradus show Delta Scuti-like amplitudes of 0.03 magnitudes in the visual passband within hours. [3] As of 2004 however, it has not been confirmed to be variable. [22]

References

  1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211. Bibcode: 2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940. S2CID  244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H. ISSN  0004-6361. S2CID  17128864.
  3. ^ a b c Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode: 2017ARep...61...80S. doi: 10.1134/S1063772917010085. eISSN  1562-6881. ISSN  1063-7729. S2CID  125853869.
  4. ^ a b Gray, R. O.; Garrison, R. F. (July 1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". The Astrophysical Journal Supplement Series. 70: 623. Bibcode: 1989ApJS...70..623G. doi: 10.1086/191349. eISSN  1538-4365. ISSN  0067-0049. S2CID  121737313.
  5. ^ Lake, R. (1965). "Photometric Magnitudes and Colours for Bright Southern Stars (Sixth List)". Monthly Notes of the Astronomical Society of South Africa. 24: 41. Bibcode: 1965MNSSA..24...41L. ISSN  0024-8266.
  6. ^ a b Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv: 0705.0878. Bibcode: 2007AN....328..889K. doi: 10.1002/asna.200710776. eISSN  1521-3994. ISSN  0004-6337. S2CID  119323941.
  7. ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971. Bibcode: 2012AstL...38..331A. doi: 10.1134/S1063773712050015. eISSN  1562-6873. ISSN  1063-7737. S2CID  119257644.
  8. ^ a b Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694. Bibcode: 2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467. eISSN  1538-3881. hdl: 1721.1/124721. S2CID  166227927.
  9. ^ a b c Allende Prieto, C.; Lambert, D. L. (December 1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv: astro-ph/9911002. Bibcode: 1999A&A...352..555A. ISSN  0004-6361. S2CID  13365201.
  10. ^ a b McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037. Bibcode: 2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x. eISSN  1365-2966. ISSN  0035-8711. S2CID  118665352.
  11. ^ a b Paunzen, E.; Schnell, A.; Maitzen, H. M. (October 2006). "An empirical temperature calibration for the Δa photometric system II: The A-type and mid F-type stars". Astronomy & Astrophysics. 458 (1): 293–296. arXiv: astro-ph/0607567. Bibcode: 2006A&A...458..293P. doi: 10.1051/0004-6361:20064889. eISSN  1432-0746. ISSN  0004-6361. S2CID  18219735.
  12. ^ a b Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv: 1904.11302. Bibcode: 2019A&A...628A..94A. doi: 10.1051/0004-6361/201935765. eISSN  1432-0746. ISSN  0004-6361. S2CID  131780028.
  13. ^ a b Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode: 1953ApJ...118..285H. doi: 10.1086/145751. eISSN  1538-4357. ISSN  0004-637X. S2CID  120328179.
  14. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode: 1879RNAO....1.....G.
  15. ^ "* kap Dor". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 3, 2023.
  16. ^ Eggleton, P. P.; Tokovinin, A. A. (11 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. eISSN  1365-2966. ISSN  0035-8711. S2CID  14878976.
  17. ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv: 1709.01160. Bibcode: 2017MNRAS.472.3805G. doi: 10.1093/mnras/stx2219. eISSN  1365-2966. ISSN  0035-8711. S2CID  118879856.
  18. ^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode: 1975mcts.book.....H.
  19. ^ Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182. ISSN  0067-0049. S2CID  120495962.
  20. ^ a b van Belle, Gerard T. (14 March 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. eISSN  1432-0754. ISSN  0935-4956. S2CID  253689867.
  21. ^ Maitzen, H. M. (April 1981). "Variability of the Extreme Silicon Star alpha Dor = HD 29305". Information Bulletin on Variable Stars. 1950: 1. Bibcode: 1981IBVS.1950....1M. ISSN  0374-0676.
  22. ^ Samus, N. N.; Durlevich, O. V. (November 2004). "VizieR Online Data Catalog: Combined General Catalogue of Variable Stars (Samus+ 2004)". VizieR Online Data Catalog: II/250. Bibcode: 2004yCat.2250....0S.
Retrieved from " https://en.wikipedia.org/?title=Kappa_Doradus&oldid=1173994178"

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