Nu Aquilae

Nu Aquilae (ν Aql, ν Aquilae) is the Bayer designation for a double star in the constellation of Aquila and lies close to the celestial equator. It has an apparent visual magnitude of 4.72 and so is visible to the naked eye.

ν Aquilae
Location of ν Aql (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension  19h 26m 31.09000s[1]
Declination +00° 20′ 18.8521″[1]
Apparent magnitude (V) 4.72[2] + 9.6[3]
Characteristics
Spectral type F3 Ib[4] + A1 IV/V[3]
U−B color index +0.60[2]
B−V color index +0.59[2]
Astrometry
Radial velocity (Rv)–2.30[5] km/s
Proper motion (μ) RA: +0.57[1] mas/yr
Dec.: –2.31[1] mas/yr
Parallax (π)1.15 ± 0.27[1] mas
Distanceapprox. 2,800 ly
(approx. 900 pc)
Absolute magnitude (MV)−5.58[6]
Details
Mass12.5[4] M☉
Radius104[7] R☉
Luminosity21,000[7] L☉
Surface gravity (log g)1.43[4] cgs
Temperature6,700[4] K
Metallicity [Fe/H]−0.03[8] dex
Rotational velocity (v sin i)13[9] km/s
Age15[4] Myr
Other designations
CCDM J19265+0021, WDS J19265+0020
ν Aql A: 32 Aql, BD+00° 4206, HD 182835, HIP 95585, HR 7387, SAO 124628
ν Aql B: BD+00° 4204, SAO 124623
Database references
SIMBADdata

The spectrum of ν Aql A matches a stellar classification of F3, with the luminosity class of Ib indicating this is a supergiant. The outer atmosphere has an effective temperature of 6,700 K and it has the yellow-white hue of an F-type star.[10] Based upon an annual parallax shift of only 1.15 mas (with a 23% margin of error), it is approximately 2,800 light-years (860 parsecs) from Earth.

ν Aql B is a ninth magnitude star 220 arc-seconds distant.[11] Little is known about it except an approximate spectral classification.[3]

References
  1. van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Burnichon, M. L. (1975). "Investigations on the intrinsic properties of high-luminosity blue stars inferred from observations of multiple systems". Astronomy and Astrophysics. 45: 383. Bibcode:1975A&A....45..383B.
  4. Lyubimkov, L. S.; et al. (2010). "Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood". Monthly Notices of the Royal Astronomical Society. 402 (2): 1369–1379. arXiv:0911.1335. Bibcode:2010MNRAS.402.1369L. doi:10.1111/j.1365-2966.2009.15979.x.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. Kovtyukh, V. V; Chekhonadskikh, F. A; Luck, R. E; Soubiran, C; Yasinskaya, M. P; Belik, S. I (2010). "Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios". Monthly Notices of the Royal Astronomical Society. 408 (3): 1568. Bibcode:2010MNRAS.408.1568K. doi:10.1111/j.1365-2966.2010.17217.x.
  7. Kaler, James B., "Nu Aquilae", Stars, University of Illinois, retrieved 2017-11-16
  8. Lyubimkov, Leonid S; Lambert, David L; Korotin, Sergey A; Rachkovskaya, Tamara M; Poklad, Dmitry B (2015). "Carbon abundance and the N/C ratio in atmospheres of A-, F- and G-type supergiants and bright giants". Monthly Notices of the Royal Astronomical Society. 446 (4): 3447. arXiv:1411.2722. Bibcode:2015MNRAS.446.3447L. doi:10.1093/mnras/stu2299.
  9. Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1), Bibcode:1970CoAsi.239....1B.
  10. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on December 3, 2013, retrieved 2012-01-16
  11. Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; Van Leeuwen, F.; Van Der Marel, H.; Mignard, F.; Murray, C. A.; Le Poole, R. S.; Schrijver, H.; Turon, C.; Arenou, F.; Froeschlé, M.; Petersen, C. S. (1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49. Bibcode:1997A&A...323L..49P.
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