Psi Aquilae

Psi Aquilae
Location of ψ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
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 mas/yr[2]
Dec.: −9.950 mas/yr[2]
Parallax (π)2.8253±0.0752 mas[2]
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 2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. 1 2 3 "psi Aql", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2012-07-21.
  4. 1 2 Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
  5. 1 2 Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal, 137: 530, Bibcode:1963ApJ...137..530C, doi:10.1086/147526.
  6. 1 2 Gontcharov, G. A. (2006), "Pulkovo compilation of radial velocities for 35495 stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  7. 1 2 3 4 5 6 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, arXiv:2111.01860, Bibcode:2022A&A...658A..91A, doi:10.1051/0004-6361/202142369.
  8. 1 2 Stassun, Keivan G.; et al. (2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467.
  9. ↑ Fouesneau, M.; et al. (2022), "Astrophysical parameters from Gaia DR2, 2MASS, and AllWISE", Astronomy and Astrophysics, 662: A125, arXiv:2201.03252, Bibcode:2022A&A...662A.125F, doi:10.1051/0004-6361/202141828.
  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, arXiv:1711.03608, Bibcode:2018AJ....155...39O, doi:10.3847/1538-3881/aa9bf4.
  11. 1 2 Abt, Helmut A.; et al. (July 2002), "Rotational Velocities of B Stars", The Astrophysical Journal, 573 (1): 359–365, Bibcode:2002ApJ...573..359A, doi:10.1086/340590.
  12. ↑ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
  13. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 18, 2012, retrieved 2012-01-16
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