HD 174179

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 mas[1]
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

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]

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Lesh1968 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Hohle2010 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Strom2005 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference McAlister1987 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Hirata1976 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference lb2017 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference chen2016 was invoked but never defined (see the help page).