Astronomy:Psi Aquilae

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Short description: Star in the constellation Aquila
Psi Aquilae
Location of ψ Aquilae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquila[1]
Right ascension  19h 44m 34.19086s[2]
Declination +13° 18′ 10.0063″[2]
Apparent magnitude (V) 6.25[3]
Characteristics
Spectral type B9 III-IV[4]
U−B color index −0.22[5]
B−V color index −0.04[5]
Astrometry
Radial velocity (Rv)−19.7±2.5[6] km/s
Proper motion (μ) RA: +0.561[2] mas/yr
Dec.: −9.950[2] mas/yr
Parallax (π)2.8253 ± 0.0752[2] mas
Distance1,150 ± 30 ly
(354 ± 9 pc)
Absolute magnitude (MV)−1.17[1]
Details
Mass3.8[7] M☉
Radius6.5[8] R☉
Luminosity506[9] L☉
Surface gravity (log g)3.41[7] cgs
Temperature10,167[7] K
Metallicity [Fe/H]0.21[7] dex
Rotation7.1[10] days
Rotational velocity (v sin i)20[11] km/s
Age~247[12] Myr
Other designations
ψ Aql, 48 Aquilae, BD+12°4059, GC 27321, HD 186547, HIP 97139, HR 7511, SAO 105199, PPM 136885[3]
Database references
SIMBADdata

Psi Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from ψ Aquilae, and abbreviated Psi Aql or ψ Aql. This is a faint star with an apparent visual magnitude of 6.25,[3] which, according to the Bortle Dark-Sky Scale, can be seen with the naked eye in dark rural skies. The orbit of the Earth causes an annual parallax shift of 2.83 mas,[2] which indicates a distance of approximately 1,150 light-years (350 parsecs). It is drifting closer to the Sun with a radial velocity of −20 km/s.[6]

The spectrum of Psi Aquilae matches a stellar classification of B9 III-IV,[4] with the luminosity class of III-IV indicating the spectrum lies part way between that of a subgiant and a giant star. The effective temperature of the star's outer atmosphere is 10,167 K,[7] giving it the blue-white hue of a B-type star.[13] It has nearly four times the mass of the Sun,[7] 6.5 times its radius,[8] and has a projected rotational velocity of 20 km/s.[11]

References

  1. ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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.
  3. ↑ 3.0 3.1 3.2 "psi Aql". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=psi+Aql. 
  4. ↑ 4.0 4.1 Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal 77: 750–755, doi:10.1086/111348, Bibcode: 1972AJ.....77..750C. 
  5. ↑ 5.0 5.1 Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal 137: 530, doi:10.1086/147526, Bibcode: 1963ApJ...137..530C. 
  6. ↑ 6.0 6.1 Gontcharov, G. A. (2006), "Pulkovo compilation of radial velocities for 35495 stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 Anders, F. et al. (2022), "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5", Astronomy and Astrophysics 658: A91, doi:10.1051/0004-6361/202142369, Bibcode: 2022A&A...658A..91A. 
  8. ↑ 8.0 8.1 Stassun, Keivan G. et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal 158 (4): 138, doi:10.3847/1538-3881/ab3467, Bibcode: 2019AJ....158..138S. 
  9. ↑ Fouesneau, M. et al. (2022), "Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE", Astronomy and Astrophysics 662: A125, doi:10.1051/0004-6361/202141828, Bibcode: 2022A&A...662A.125F. 
  10. ↑ Oelkers, Ryan J. et al. (2018), "Variability Properties of Four Million Sources in the TESS Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey", The Astronomical Journal 155 (1): 39, doi:10.3847/1538-3881/aa9bf4, Bibcode: 2018AJ....155...39O. 
  11. ↑ 11.0 11.1 Abt, Helmut A. et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal 573 (1): 359–365, doi:10.1086/340590, Bibcode: 2002ApJ...573..359A. 
  12. ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters 38 (11): 694–706, doi:10.1134/S1063773712110035, Bibcode: 2012AstL...38..694G. 
  13. ↑ "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 



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