Mu Aquilae

Mu Aquilae (μ Aql, μ Aquilae) is the Bayer designation for a star in the equatorial constellation of Aquila. With an apparent visual magnitude of 4.45,[2] it is visible to the naked eye. The measured annual parallax shift of 30.31 mas,[1] which is equivalent to a distance of 107.6 light-years (33.0 parsecs) from Earth.

Mu Aquilae
Location of μ Aquilae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension 19h 34m 05.3529s[1]
Declination +07° 22′ 44.189″[1]
Apparent magnitude (V) 4.45[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.24[2]
B−V color index +1.176[4]
R−I color index 0.61
Astrometry
Radial velocity (Rv)-24.73 ± 0.13[5] km/s
Proper motion (μ) RA: +213.73[1] mas/yr
Dec.: -156.55[1] mas/yr
Parallax (π)30.31 ± 0.24[1] mas
Distance107.6 ± 0.9 ly
(33.0 ± 0.3 pc)
Absolute magnitude (MV)1.80[5]
Details
Mass0.92[5] M☉
Radius8[4] R☉
Luminosity24.5[4] L☉
Surface gravity (log g)2.6[4] cgs
Temperature4,467[4] K
Metallicity [Fe/H]–0.13[4] dex
Rotational velocity (v sin i)0.0[4] km/s
Other designations
38 Aql, BD+07 4132, FK5 1511, GJ 9661, HD 184406, HIP 96229, HR 7429, LTT 15709, SAO 124799.[6]
Database references
SIMBADdata

The stellar classification of Mu Aquilae is K3 III,[3] indicating that this is an evolved giant star. It belongs to a sub-category called the red clump, indicating that it is generating energy through the fusion of helium at its core.[7] Compared to the Sun, it has 92%[5] of the mass but has expanded to eight times the size.[4] This inflated outer envelope has an effective temperature of 4,467 K[4] and is radiating 24.5[4] times the Sun's luminosity. At this heat, Mu Aquilae glows with the orange hue of a K-type star.[8]

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, S2CID 18759600.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
  4. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946, S2CID 119529768
  6. "* mu. Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.
  7. Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv:astro-ph/0003329, Bibcode:2000ApJ...539..732A, doi:10.1086/309278, S2CID 16673121.
  8. "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on March 10, 2012, retrieved 2012-01-16.
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