N Scorpii

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, 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]

  1. ^ a b c d Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Ducati2002 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Stankov2005 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Satori2003 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Brown1997 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Norma was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Rizzuto2011 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference de Vaucouleurs1957 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Buscombe1969 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Hiltner1969 was invoked but never defined (see the help page).
  20. ^ Cite error: The named reference Sterken1983 was invoked but never defined (see the help page).
  21. ^ Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  22. ^ Cite error: The named reference Schrijves2002 was invoked but never defined (see the help page).