HD 174179

HD 174179 is a single[8] star in the northern constellation of Lyra. It has a white hue and is dimly visible to the naked eye with an apparent visual magnitude of 6.06.[2] The star is located at a distance of approximately 1,280 light years from the Sun based on parallax,[1] but is drifting closer with a radial velocity of −15 km/s.[2]

HD 174179
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 46m 13.01070s[1]
Declination +41° 26′ 30.5041″[1]
Apparent magnitude (V) 6.06[2]
Characteristics
Spectral type B3IVp[3][4]
B−V color index −0.139±0.003[2]
Astrometry
Radial velocity (Rv)−15.0±2.9[2] km/s
Proper motion (μ) RA: +1.093[1] mas/yr
Dec.: −3.957[1] mas/yr
Parallax (π)2.5407 ± 0.0769[1] mas
Distance1,280 ± 40 ly
(390 ± 10 pc)
Absolute magnitude (MV)−1.57[2]
Details
Mass6.6±0.1[4] M☉
Luminosity (bolometric)2,036[5] L☉
Temperature17,900[5] K
Rotational velocity (v sin i)5[6] km/s
Age32.8±5.0[4] Myr
Other designations
BD+31°3369, FK5 3493, GC 25768, HD 174179, HIP 92243, HR 7081, SAO 67396[7]
Database references
SIMBADdata

The star is an estimated 33[4] million years old with a low projected rotational velocity of 5 km/s.[6] It has 6.6[4] times the mass of the Sun and is radiating 2,036[5] times the Sun's luminosity from its photosphere at an effective temperature of 17,900 K.[5]

HD 174179 is a Be star, showing Balmer emission lines in its spectrum at times. It has a stellar classification of B3IVp,[4] with 'p' indicating spectral features of a shell star.[3] A 1976 study found no emission features,[9] but the star was reported to show emission lines again in later studies.[10][11]

References
  1. 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.
  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.
  3. Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179.
  4. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  5. Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  6. Strom, Stephen E.; et al. (February 2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal, 129 (2): 809–828, arXiv:astro-ph/0410337, Bibcode:2005AJ....129..809S, doi:10.1086/426748.
  7. "HD 174179". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-08.
  8. McAlister, Harold A.; et al. (January 1987), "ICCD Speckle Observations of Binary Stars. I. A Survey for Duplicity Among the Bright Stars", Astronomical Journal, 93: 183, Bibcode:1987AJ.....93..183M, doi:10.1086/114297.
  9. Hirata, R.; Asada, Y. (1976), "Spectroscopic observations of suspected Be stars", Publications of the Astronomical Society of Japan, 28: 713–716, Bibcode:1976PASJ...28..713H.
  10. Labadie-Bartz, Jonathan; Pepper, Joshua; McSwain, M. Virginia; Bjorkman, J. E.; Bjorkman, K. S.; Lund, Michael B.; Rodriguez, Joseph E.; Stassun, Keivan G.; Stevens, Daniel J.; James, David J.; Kuhn, Rudolf B.; Siverd, Robert J.; Beatty, Thomas G.; Beatty, Thomas G. (2017), "Photometric Variability of the be Star Population", The Astronomical Journal, 153 (6): 252, arXiv:1609.08449, Bibcode:2017AJ....153..252L, doi:10.3847/1538-3881/aa6396.
  11. Chen, P. S.; Liu, J. Y.; Shan, H. G. (2016), "A new approach to the infrared photometric study of be stars", Monthly Notices of the Royal Astronomical Society, 463 (2): 1162, Bibcode:2016MNRAS.463.1162C, doi:10.1093/mnras/stw1757.
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