N Scorpii

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N Scorpii
Scorpius IAU.svg
Red circle.svg
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]
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
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
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]

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References

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  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.
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  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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