N Scorpii

N Scorpii, also known as HD 148703, is a solitary,[14] bluish-white hued star located in the southern constellation Scorpius. It has an apparent magnitude of 4.23, making it readily visible to the naked eye. N Scorpii was initially given the Bayer designation Alpha Normae by Lacaille but it was later moved from Norma to Scorpius.[15] N Scorpii is currently located 550 light years away based on parallax measurements from the Hipparcos satellite and is part of the Upper Scorpius–Centaurus region of the Scorpius–Centaurus association.[16]

N Scorpii
Location of N Scorpii on the map
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Scorpius
Right ascension 16h 31m 22.93300s[1]
Declination −34° 42′ 15.7146″[1]
Apparent magnitude (V) 4.23[2]
Characteristics
Spectral type B2 III-IV[3]
U−B color index −0.76[2]
B−V color index −0.17[2]
Variable type candidate β Cephei[4]
Astrometry
Radial velocity (Rv)0.8±1.5[5] km/s
Proper motion (μ) RA: −12.05±0.20 mas/yr[1]
Dec.: −18.16±0.13 mas/yr[1]
Parallax (π)5.88 ± 0.19 mas[1]
Distance550 ± 20 ly
(170 ± 5 pc)
Absolute magnitude (MV)−1.91[6]
Details
Mass7.8±0.1[7] M☉
Radius6.25[8] R☉
Luminosity (bolometric)6,918[9] L☉
Surface gravity (log g)4.0[9] cgs
Temperature21,877[9] K
Metallicity [Fe/H]+0.01[10] dex
Rotational velocity (v sin i)70±8[11] km/s
Age22±4[7] Myr
Other designations
N Scorpii, 72 G. Scorpii[12], CD−34°11044, CPD−34°6528, FK5 1431, GC 22195, HD 148703, HIP 80911, HR 6143, SAO 207732[13]
Database references
SIMBADdata

N Scorpii has been given several stellar classifications over the years. It has been given the luminosity class of a main sequence star (V),[17] a subgiant (IV),[18] an evolved giant star (III),[19] or a blend between the last two classes (III-IV).[3] It is generally classified as either a B2 or B3 star several times hotter than the Sun. HD 148703 is a candidate β Cephei variable[4] and its variability was first noticed in 1983 by C. Sterken.[20] Further observations were made by Abt et al. (2002) by observing its projected rotational velocity.[21] It was identified as a candidate in 2002 in a survey for non-radial pulsations in B-type stars.[22]

The object has two generally accepted classes: B2 III-IV and B2 IV. It has 7.8 times the mass of the Sun[7] and 6.25 times its girth.[8] It has a bolometric luminosity 6,918 times greater than the Sun from its photosphere at an effective temperature of 21,877 K.[9] N Scorpii is estimated to be 22 million years old,[7] which is twice the average age of the aforementioned association. Like most hot stars, N Scorpii spins rapidly, having a projected rotational velocity of 70 km/s.[11]

References
  1. van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Hipparcos record for this source at VizieR.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. Bibcode:2002yCat.2237....0D.
  3. Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
  4. Stankov, Anamarija; Handler, Gerald (June 2005). "Catalog of Galactic β Cephei Stars". The Astrophysical Journal Supplement Series. 158 (2): 193–216. arXiv:astro-ph/0506495. Bibcode:2005ApJS..158..193S. doi:10.1086/429408. eISSN 1538-4365. ISSN 0067-0049.
  5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  6. 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.
  7. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. Oxford University Press (OUP). 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711.
  8. Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. eISSN 1432-0746. ISSN 0004-6361.
  9. Sartori, M. J.; Lépine, J. R. D.; Dias, W. S. (June 2003). "Formation scenarios for the young stellar associations between galactic longitudes l = 280° - 360°". Astronomy & Astrophysics. 404 (3): 913–926. arXiv:astro-ph/0304426. Bibcode:2003A&A...404..913S. doi:10.1051/0004-6361:20030581. eISSN 1432-0746. ISSN 0004-6361.
  10. 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.
  11. Brown, A. G. A.; Verschueren, W. (March 1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy & Astrophysics. 319: 811–838. arXiv:astro-ph/9608089. Bibcode:1997A&A...319..811B. ISSN 0004-6361.
  12. 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.
  13. "N Scorpii". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved October 17, 2022.
  14. 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.
  15. "Norma Constellation (the Level): Stars, Story, Facts... | Constellation Guide". www.constellation-guide.com. Retrieved 11 October 2021.
  16. Rizzuto, A. C.; Ireland, M. J.; Robertson, J. G. (18 August 2011). "Multidimensional Bayesian membership analysis of the Sco OB2 moving group". Monthly Notices of the Royal Astronomical Society. 416 (4): 3108–3117. arXiv:1106.2857. Bibcode:2011MNRAS.416.3108R. doi:10.1111/j.1365-2966.2011.19256.x. ISSN 0035-8711.
  17. de Vaucouleurs, A. (1 August 1957). "Spectral Types and Luminosities of B, A and F Southern Stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449–462. Bibcode:1957MNRAS.117..449D. doi:10.1093/mnras/117.4.449. eISSN 1365-2966. ISSN 0035-8711.
  18. Buscombe, W. (1 May 1969). "Line Strengths for Southern OB stars--II: Observations with Moderate Dispersion". Monthly Notices of the Royal Astronomical Society. 144 (1): 31–39. Bibcode:1969MNRAS.144...31B. doi:10.1093/mnras/144.1.31. ISSN 0035-8711.
  19. Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969). "MK Spectral Types for Bright Southern OB Stars". The Astrophysical Journal. 157: 313. Bibcode:1969ApJ...157..313H. doi:10.1086/150069. eISSN 1538-4357. ISSN 0004-637X.
  20. Sterken, C.; Jerzykiewicz, M. (1983). "Search for beta Cephei stars south of declination -20 II. Photometric and spectrographic observations of early B giants and subgiants - Winter objects". Acta Astronomica. 33: 89–111. Bibcode:1983AcA....33...89S. ISSN 0001-5237.
  21. Abt, Helmut A.; Levato, Hugo; Grosso, Monica (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590. ISSN 0004-637X.
  22. Schrijvers, C.; Telting, J. H.; De Ridder, J. (2002). A Spectroscopic Search for Non-Radial Pulsations in Early B-Type Stars. Vol. 259. p. 204. Bibcode:2002ASPC..259..204S.
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