Astronomy:Nu Aquilae

From HandWiki
Short description: Star in the constellation Aquila
ν Aquilae
Location of ν Aql (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquila
Right ascension  19h 26m 31.08926s[1]
Declination +00° 20′ 18.8549″[1]
Apparent magnitude (V) 4.72[2]
Characteristics
Evolutionary stage supergiant[3]
Spectral type F3 Ib[4]
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: −0.562[1] mas/yr
Dec.: −2.294[1] mas/yr
Parallax (π)0.8752 ± 0.0869[1] mas
Distance3,700 ± 400 ly
(1,100 ± 100 pc)
Absolute magnitude (MV)−5.58[3]
Details
Mass12.5[4] M☉
Radius71.20+14.45−10.23[6] R☉
Luminosity7,645±1,464[6] L☉
Surface gravity (log g)1.43[4] cgs
Temperature6,396+516
−564[6] K
Metallicity [Fe/H]−0.03[7] dex
Rotational velocity (v sin i)13[8] km/s
Age15[4] Myr
Other designations
ν Aql, 32 Aql, BD+00°4206, HD 182835, HIP 95585, HR 7387, SAO 124628, CCDM J19265+0021A, WDS J19265+0020A, 2MASS J19460427+1145429
Database references
SIMBADdata

Nu Aquilae is a supergiant star in the constellation of Aquila that lies close to the celestial equator. Its name is a Bayer designation that is Latinized from ν Aquilae, and abbreviated Nu Aql or ν Aql. It has an apparent visual magnitude of 4.72 and so is faintly visible to the naked eye. Based upon an annual parallax shift of 0.8752 mas (with a 10% margin of error), it is believed to lie approximately 3,700 light-years (1,100 parsecs) from Earth.[1] The variable star NU Aquilae has a similar-looking designation but is a separate and unrelated object.

The spectrum of ν Aql A matches a stellar classification of F3, with the luminosity class of Ib indicating this is a supergiant. This is a massive star, with approximately 12.5 times the mass of the sun,[4] and it spans ~71 times the Sun's girth.[6] It is only 15[4] million years old and is radiating around 7,600 times the luminosity of the Sun.[6] The outer atmosphere has an effective temperature of 6,700 K and it has the yellow-white hue of an F-type star.[9]

ν Aql B is a magnitude 9.6 star 201 arc-seconds distant[10] with spectral classification of A1 IV/V.[11] It is not physically associated with Nu Aquilae[12] and is at about half the distance of Nu Aquilae.[13]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 Kovtyukh, V. V. et al. (2010). "Accurate luminosities for F-G supergiants from FeII/FeI line depth ratios". Monthly Notices of the Royal Astronomical Society 408 (3): 1568. doi:10.1111/j.1365-2966.2010.17217.x. Bibcode: 2010MNRAS.408.1568K. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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. doi:10.1111/j.1365-2966.2009.15979.x. Bibcode: 2010MNRAS.402.1369L. 
  5. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ Lyubimkov, Leonid S. et al. (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. doi:10.1093/mnras/stu2299. Bibcode: 2015MNRAS.446.3447L. 
  8. ↑ Bernacca, P. L.; Perinotto, M. (1970). "A catalogue of stellar rotational velocities". Contributi Osservatorio Astronomico di Padova in Asiago 239 (1): 1. Bibcode: 1970CoAsi.239....1B. 
  9. ↑ "The Colour of Stars". Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation). December 21, 2004. http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html. Retrieved 2012-01-16. 
  10. ↑ Mason, Brian D. et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 
  11. ↑ 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. 
  12. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  13. ↑ Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:Nu_Aquilae&oldid=4134472"