Delta Normae

Delta Normae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Norma
Right ascension 16h 06m 29.43692s[1]
Declination −45° 10′ 23.4518″[1]
Apparent magnitude (V) 4.74[2]
Characteristics
Spectral type kA3hA7mF0 III:[3]
U−B color index +0.16[2]
B−V color index +0.24[2]
Astrometry
Radial velocity (Rv)−15.5±2.8[4] km/s
Proper motion (μ) RA: −16.19[1] mas/yr
Dec.: −38.45[1] mas/yr
Parallax (π)26.66 ± 0.74 mas[1]
Distance122 ± 3 ly
(38 ± 1 pc)
Absolute magnitude (MV)+1.86[5]
Details
Mass1.75[6] M☉
Radius2.00[6] R☉
Luminosity13.4[7] L☉
Surface gravity (log g)4.04[8] cgs
Temperature7,691[8] K
Metallicity [Fe/H]+0.32[8] dex
Rotational velocity (v sin i)7[6] km/s
Age62.5±12.5[6] Myr
Other designations
δ Nor, CD−44° 10625, FK5 596, HD 144197, HIP 78914, HR 5980, SAO 226500[9]
Database references
SIMBADdata

Delta Normae, Latinised from δ Normae, is a star system in the southern constellation of Norma. It is visible to the naked eye with an apparent visual magnitude of 4.74.[2] Based upon an annual parallax shift of 26.66 mas as seen from Earth,[1] the system is located about 122 light-years distant from the Sun.

Because the proper motion of the star has been found to change over time, this is most likely an astrometric binary.[10][11] The visible component is an Am star, which means it displays the spectrum of a metal-lined A-type chemically peculiar star. The stellar classification of kA3hA7mF0 III:[3] indicates it is an evolved giant with the calcium K-lines of an A3-class star, the hydrogen lines of an A7 star, and F0-class metallic lines. It has a magnetic field with an effective strength of (169.73±151.7)×10−4 T.[12]

Delta Normae has an estimated 1.75 times the mass of the Sun and twice the Sun's radius. It is around 63 million years old, and, as with other Am stars, has a relatively low spin rate with a projected rotational velocity of 7 km/s.[6] The star is radiating 13.4[7] times the Sun's luminosity from its photosphere at an effective temperature of 7,691 K.[8]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference feinstein1974 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference Plavchan2009 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Soubiran2010 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Frankowski2007 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Bychkova2009 was invoked but never defined (see the help page).