N Scorpii
| 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] |
| Distance | 550 ± 20 ly (170 ± 5 pc) |
| Absolute magnitude (MV) | −1.91[6] |
| Details | |
| Mass | 7.8±0.1[7] M☉ |
| Radius | 6.25[8] R☉ |
| Luminosity (bolometric) | 6,918[9] L☉ |
| Surface gravity (log g) | 4.0[9] cgs |
| Temperature | 21,877[9] K |
| Metallicity [Fe/H] | +0.01[10] dex |
| Rotational velocity (v sin i) | 70±8[11] km/s |
| Age | 22±4[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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 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 size.[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
[edit ]- ^ a b c d 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.
- ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b Houk, N. (1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations −40° to −26°. Bibcode:1982mcts.book.....H.
- ^ a b 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.
- ^ 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.
- ^ 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.
- ^ a b c d 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. 410 (1). Oxford University Press (OUP): 190–200. arXiv:1007.4883 . Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x . ISSN 0035-8711.
- ^ a b 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.
- ^ a b c d 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.
- ^ 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.
- ^ a b 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.
- ^ 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.
- ^ "N Scorpii". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved October 17, 2022.
- ^ 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.
- ^ "Norma Constellation (the Level): Stars, Story, Facts... | Constellation Guide". www.constellation-guide.com. Retrieved 11 October 2021.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Schrijvers, C.; Telting, J. H.; De Ridder, J. (2002). "A Spectroscopic Search for Non-Radial Pulsations in Early B-Type Stars". IAU Colloq. 185: Radial and Nonradial Pulsationsn as Probes of Stellar Physics. 259: 204. Bibcode:2002ASPC..259..204S.