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𝜈 Draconis

𝜈 Draconis in optical light
Observation data
Epoch J2000       Equinox J2000
Constellation Draco
𝜈1 Dra
Right ascension 17h 32m 10.56856s [1]
Declination +55° 11′ 03.2739″ [1]
Apparent magnitude (V) +4.88 [2]
𝜈2 Dra
Right ascension 17h 32m 16.02464s [1]
Declination +55° 10′ 22.6504″ [1]
Apparent magnitude (V) +4.88 [2]
Characteristics
𝜈1 Dra
Spectral type A8Vm [3] (kA3hF0mF0 [4])
U−B color index +0.03 [2]
B−V color index +0.26 [2]
𝜈2 Dra
Spectral type A4IVm [3] (kA3hF1mF0 [4])
U−B color index +0.04 [2]
B−V color index +0.27 [2]
Astrometry
𝜈1 Dra
Radial velocity (Rv)–15.2 [5] km/s
Proper motion (μ) RA: +147.39 [1]  mas/ yr
Dec.: +54.31 [1]  mas/ yr
Parallax (π)33.06 ± 0.15  mas [1]
Distance98.7 ± 0.4  ly
(30.2 ± 0.1  pc)
𝜈2 Dra
Radial velocity (Rv)–16.0 [5] km/s
Proper motion (μ) RA: +142.65 [1]  mas/ yr
Dec.: +62.43 [1]  mas/ yr
Parallax (π)32.80 ± 0.18  mas [1]
Distance99.4 ± 0.5  ly
(30.5 ± 0.2  pc)
Orbit [6]
Primary𝜈2 Dra A
Companion𝜈2 Dra B
Period (P)38.034 days
Eccentricity (e)0.03
Semi-amplitude (K1)
(primary)		10.0 km/s
Details
𝜈1 Dra
Mass1.85 [7]  M☉
Surface gravity (log g)4.2 [8]  cgs
Temperature7,533 [8]  K
Metallicity+0.03 [8]
Rotational velocity (v sin i)86 [9] km/s
Age13.0 [10]  Myr
𝜈2 Dra
Mass1.61 + 0.24 [7]  M☉
Radius1.812 [11]  R☉
Surface gravity (log g)4.11 [12]  cgs
Temperature7,272 [8]  K
Rotational velocity (v sin i)68 [9] km/s
Other designations
𝜈 Draconis, 𝜈 Dra, Kuma
𝜈1 Dra: 24 Dra, BD+55 1944, FK5 655, HD 159541, HIP 85819, HR 6554, SAO 30447 [13]
𝜈2 Dra: 25 Dra, BD+55 1945, FK5 657, HD 159560, HIP 85829, HR 6555, SAO 30450 [14]
Database references
SIMBAD 𝜈 Dra
𝜈1 Dra
𝜈2 Dra

Nu Draconis (also known as 𝜈 Dra, 𝜈 Draconis, where 𝜈 is the Greek letter nu, or traditionally as Kuma /ˈkjuːmə/) is a double star in the constellation Draco. The respective components are designated 𝜈1 Draconis and 𝜈2 Draconis. The second component is a spectroscopic binary star system. [14]

This star, along with β Dra (Rastaban), γ Dra (Eltanin), μ Dra (Alrakis) and ξ Dra (Grumium) were Al ʽAwāïd, "the Mother Camels", which was later known as the Quinque Dromedarii. [15]

In Chinese, 天棓 (Tiān Bàng), meaning Celestial Flail, refers to an asterism consisting of 𝜈 Draconis, ξ Draconis, β Draconis, γ Draconis and ι Herculis. [16] Consequently, the Chinese name for 𝜈 Draconis itself is 天棓二 (Tiān Bàng èr, English: the Second Star of Celestial Flail.) [17]

The two stars of the visual binary are considered to be a common proper motion pair on the basis of their very similar parallaxes, radial velocities, and proper motions, although no orbital motion can be observed. [18]

𝜈1 Draconis is an Am star, a slowly rotating chemically peculiar star with abnormally strong metallic absorption lines in its spectrum. Its spectral type of kA3hF0mF0 means that it would have a spectral class of A3 if determined solely from its calcium K lines, F0 if determined from its hydrogen lines, and F0 if determined from other metallic spectral lines. [4]

𝜈2 Draconis is a spectroscopic binary with a period of 38 days. The two stars are separated by 0.267 au on average, and they have an almost circular orbit with an eccentricity of 0.03. [19] [6] The primary is also an Am star, while the secondary has a low mass and luminosity and is only inferred from the orbital movement of the more massive star. [7]

References

  1. ^ a b c d e f g h i j van Leeuwen, F. (November 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. ^ a b c d e f Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J PDF
  3. ^ a b Chen, P. S; Liu, J. Y; Shan, H. G (2017). "A New Photometric Study of Ap and Am Stars in the Infrared". The Astronomical Journal. 153 (5): 218. Bibcode: 2017AJ....153..218C. doi: 10.3847/1538-3881/aa679a.
  4. ^ a b c Abt, Helmut A; Morrell, Nidia I (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182.
  5. ^ a b Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode: 1953GCRV..C......0W.
  6. ^ a b Margoni, R; Munari, U; Stagni, R (1992). "Spectroscopic orbits of AM stars. I - Seven field stars". Astronomy and Astrophysics Supplement Series. 93: 545. Bibcode: 1992A&AS...93..545M.
  7. ^ a b c A.Tokovinin. "Multiple Star Catalog". Archived from the original on 2020-10-03. Retrieved 2018-04-24.
  8. ^ a b c d Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv: 1605.07384. Bibcode: 2016A&A...591A.118S. doi: 10.1051/0004-6361/201628497. S2CID  119258214.
  9. ^ 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 (3): 897–911, arXiv: astro-ph/0205255, Bibcode: 2002A&A...393..897R, doi: 10.1051/0004-6361:20020943, S2CID  14070763
  10. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv: 1007.4883. Bibcode: 2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x. S2CID  118629873. Vizier catalog entry
  11. ^ Masana, E; Jordi, C; Ribas, I (2006). "Effective temperature scale and bolometric corrections from 2MASS photometry". Astronomy & Astrophysics. 450 (2): 735. arXiv: astro-ph/0601049. Bibcode: 2006A&A...450..735M. doi: 10.1051/0004-6361:20054021. S2CID  15278668.
  12. ^ Stateva, I.; Belcheva, M.; Iliev, I. Kh.; Budaj, J.; Barzova, I.S. (April 2008). "Chemical abundances study of three Am stars HD155375, HD159560 and HD196544". Contributions of the Astronomical Observatory Skalnaté Pleso. 38 (2): 455–456. Bibcode: 2008CoSka..38..455S.
  13. ^ "24 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-04.
  14. ^ a b "25 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-04.
  15. ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc, p.  207, ISBN  978-0-486-21079-7, retrieved 2010-12-12
  16. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN  978-986-7332-25-7.
  17. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2011-01-29 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. ^ Lépine, Sébastien; Bongiorno, Bethany (2007). "New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems". The Astronomical Journal. 133 (3): 889–905. arXiv: astro-ph/0610605. Bibcode: 2007AJ....133..889L. doi: 10.1086/510333. S2CID  16800796.
  19. ^ Rodriguez, David R; Duchêne, Gaspard; Tom, Henry; Kennedy, Grant M; Matthews, Brenda; Greaves, Jane; Butner, Harold (2015). "Stellar multiplicity and debris discs: An unbiased sample". Monthly Notices of the Royal Astronomical Society. 449 (3): 3160. arXiv: 1503.01320. Bibcode: 2015MNRAS.449.3160R. doi: 10.1093/mnras/stv483. S2CID  119237891.

External links


Retrieved from " https://en.wikipedia.org/?title=Nu_Draconis&oldid=1217435262"
From Wikipedia, the free encyclopedia
𝜈 Draconis

𝜈 Draconis in optical light
Observation data
Epoch J2000       Equinox J2000
Constellation Draco
𝜈1 Dra
Right ascension 17h 32m 10.56856s [1]
Declination +55° 11′ 03.2739″ [1]
Apparent magnitude (V) +4.88 [2]
𝜈2 Dra
Right ascension 17h 32m 16.02464s [1]
Declination +55° 10′ 22.6504″ [1]
Apparent magnitude (V) +4.88 [2]
Characteristics
𝜈1 Dra
Spectral type A8Vm [3] (kA3hF0mF0 [4])
U−B color index +0.03 [2]
B−V color index +0.26 [2]
𝜈2 Dra
Spectral type A4IVm [3] (kA3hF1mF0 [4])
U−B color index +0.04 [2]
B−V color index +0.27 [2]
Astrometry
𝜈1 Dra
Radial velocity (Rv)–15.2 [5] km/s
Proper motion (μ) RA: +147.39 [1]  mas/ yr
Dec.: +54.31 [1]  mas/ yr
Parallax (π)33.06 ± 0.15  mas [1]
Distance98.7 ± 0.4  ly
(30.2 ± 0.1  pc)
𝜈2 Dra
Radial velocity (Rv)–16.0 [5] km/s
Proper motion (μ) RA: +142.65 [1]  mas/ yr
Dec.: +62.43 [1]  mas/ yr
Parallax (π)32.80 ± 0.18  mas [1]
Distance99.4 ± 0.5  ly
(30.5 ± 0.2  pc)
Orbit [6]
Primary𝜈2 Dra A
Companion𝜈2 Dra B
Period (P)38.034 days
Eccentricity (e)0.03
Semi-amplitude (K1)
(primary)		10.0 km/s
Details
𝜈1 Dra
Mass1.85 [7]  M☉
Surface gravity (log g)4.2 [8]  cgs
Temperature7,533 [8]  K
Metallicity+0.03 [8]
Rotational velocity (v sin i)86 [9] km/s
Age13.0 [10]  Myr
𝜈2 Dra
Mass1.61 + 0.24 [7]  M☉
Radius1.812 [11]  R☉
Surface gravity (log g)4.11 [12]  cgs
Temperature7,272 [8]  K
Rotational velocity (v sin i)68 [9] km/s
Other designations
𝜈 Draconis, 𝜈 Dra, Kuma
𝜈1 Dra: 24 Dra, BD+55 1944, FK5 655, HD 159541, HIP 85819, HR 6554, SAO 30447 [13]
𝜈2 Dra: 25 Dra, BD+55 1945, FK5 657, HD 159560, HIP 85829, HR 6555, SAO 30450 [14]
Database references
SIMBAD 𝜈 Dra
𝜈1 Dra
𝜈2 Dra

Nu Draconis (also known as 𝜈 Dra, 𝜈 Draconis, where 𝜈 is the Greek letter nu, or traditionally as Kuma /ˈkjuːmə/) is a double star in the constellation Draco. The respective components are designated 𝜈1 Draconis and 𝜈2 Draconis. The second component is a spectroscopic binary star system. [14]

This star, along with β Dra (Rastaban), γ Dra (Eltanin), μ Dra (Alrakis) and ξ Dra (Grumium) were Al ʽAwāïd, "the Mother Camels", which was later known as the Quinque Dromedarii. [15]

In Chinese, 天棓 (Tiān Bàng), meaning Celestial Flail, refers to an asterism consisting of 𝜈 Draconis, ξ Draconis, β Draconis, γ Draconis and ι Herculis. [16] Consequently, the Chinese name for 𝜈 Draconis itself is 天棓二 (Tiān Bàng èr, English: the Second Star of Celestial Flail.) [17]

The two stars of the visual binary are considered to be a common proper motion pair on the basis of their very similar parallaxes, radial velocities, and proper motions, although no orbital motion can be observed. [18]

𝜈1 Draconis is an Am star, a slowly rotating chemically peculiar star with abnormally strong metallic absorption lines in its spectrum. Its spectral type of kA3hF0mF0 means that it would have a spectral class of A3 if determined solely from its calcium K lines, F0 if determined from its hydrogen lines, and F0 if determined from other metallic spectral lines. [4]

𝜈2 Draconis is a spectroscopic binary with a period of 38 days. The two stars are separated by 0.267 au on average, and they have an almost circular orbit with an eccentricity of 0.03. [19] [6] The primary is also an Am star, while the secondary has a low mass and luminosity and is only inferred from the orbital movement of the more massive star. [7]

References

  1. ^ a b c d e f g h i j van Leeuwen, F. (November 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. ^ a b c d e f Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode: 1966CoLPL...4...99J PDF
  3. ^ a b Chen, P. S; Liu, J. Y; Shan, H. G (2017). "A New Photometric Study of Ap and Am Stars in the Infrared". The Astronomical Journal. 153 (5): 218. Bibcode: 2017AJ....153..218C. doi: 10.3847/1538-3881/aa679a.
  4. ^ a b c Abt, Helmut A; Morrell, Nidia I (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode: 1995ApJS...99..135A. doi: 10.1086/192182.
  5. ^ a b Wilson, Ralph Elmer (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication. Washington: Carnegie Institution of Washington. Bibcode: 1953GCRV..C......0W.
  6. ^ a b Margoni, R; Munari, U; Stagni, R (1992). "Spectroscopic orbits of AM stars. I - Seven field stars". Astronomy and Astrophysics Supplement Series. 93: 545. Bibcode: 1992A&AS...93..545M.
  7. ^ a b c A.Tokovinin. "Multiple Star Catalog". Archived from the original on 2020-10-03. Retrieved 2018-04-24.
  8. ^ a b c d Soubiran, Caroline; Le Campion, Jean-François; Brouillet, Nathalie; Chemin, Laurent (2016). "The PASTEL catalogue: 2016 version". Astronomy & Astrophysics. 591: A118. arXiv: 1605.07384. Bibcode: 2016A&A...591A.118S. doi: 10.1051/0004-6361/201628497. S2CID  119258214.
  9. ^ 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 (3): 897–911, arXiv: astro-ph/0205255, Bibcode: 2002A&A...393..897R, doi: 10.1051/0004-6361:20020943, S2CID  14070763
  10. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv: 1007.4883. Bibcode: 2011MNRAS.410..190T. doi: 10.1111/j.1365-2966.2010.17434.x. S2CID  118629873. Vizier catalog entry
  11. ^ Masana, E; Jordi, C; Ribas, I (2006). "Effective temperature scale and bolometric corrections from 2MASS photometry". Astronomy & Astrophysics. 450 (2): 735. arXiv: astro-ph/0601049. Bibcode: 2006A&A...450..735M. doi: 10.1051/0004-6361:20054021. S2CID  15278668.
  12. ^ Stateva, I.; Belcheva, M.; Iliev, I. Kh.; Budaj, J.; Barzova, I.S. (April 2008). "Chemical abundances study of three Am stars HD155375, HD159560 and HD196544". Contributions of the Astronomical Observatory Skalnaté Pleso. 38 (2): 455–456. Bibcode: 2008CoSka..38..455S.
  13. ^ "24 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-04.
  14. ^ a b "25 Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-06-04.
  15. ^ Allen, R. H. (1963), Star Names: Their Lore and Meaning (Reprint ed.), New York, NY: Dover Publications Inc, p.  207, ISBN  978-0-486-21079-7, retrieved 2010-12-12
  16. ^ (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN  978-986-7332-25-7.
  17. ^ (in Chinese) 香港太空館 - 研究資源 - 亮星中英對照表 Archived 2011-01-29 at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010.
  18. ^ Lépine, Sébastien; Bongiorno, Bethany (2007). "New Distant Companions to Known Nearby Stars. II. Faint Companions of Hipparcos Stars and the Frequency of Wide Binary Systems". The Astronomical Journal. 133 (3): 889–905. arXiv: astro-ph/0610605. Bibcode: 2007AJ....133..889L. doi: 10.1086/510333. S2CID  16800796.
  19. ^ Rodriguez, David R; Duchêne, Gaspard; Tom, Henry; Kennedy, Grant M; Matthews, Brenda; Greaves, Jane; Butner, Harold (2015). "Stellar multiplicity and debris discs: An unbiased sample". Monthly Notices of the Royal Astronomical Society. 449 (3): 3160. arXiv: 1503.01320. Bibcode: 2015MNRAS.449.3160R. doi: 10.1093/mnras/stv483. S2CID  119237891.

External links


Retrieved from " https://en.wikipedia.org/?title=Nu_Draconis&oldid=1217435262"

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