19 Lyrae

19 Lyrae

A light curve for 19 Lyrae, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 11m 46.008s[2]
Declination +31° 17′ 00.44″[2]
Apparent magnitude (V) 5.93[3]
Characteristics
Spectral type B8 IIIp Si Sr[4]
B−V color index −0.062±0.004[3]
Variable type α2 CVn[5]
Astrometry
Radial velocity (Rv)−30.1±2.9[3] km/s
Proper motion (μ) RA: −4.143 mas/yr[2]
Dec.: −2.763 mas/yr[2]
Parallax (π)3.4213 ± 0.0417 mas[2]
Distance950 ± 10 ly
(292 ± 4 pc)
Absolute magnitude (MV)−1.24[3]
Details
Mass3.76±0.22[6] M☉
Radius6.40[7] R☉
Luminosity397.48[3] L☉
Temperature11,194+501
−479[6] K
Rotational velocity (v sin i)35[8] km/s
Other designations
19 Lyr, V471 Lyr, NSV 11806, BD+31°3497, FK5 3532, GC 26459, HD 179527, HIP 94311, HR 7283, SAO 67946[9]
Database references
SIMBADdata

19 Lyrae is a single[10] variable star located approximately 950[2] light years away from the Sun in the northern constellation of Lyra.[9] It has the variable star designation V471 Lyr, while 19 Lyrae is the Flamsteed designation. This object is just bright enough to be visible to the naked eye, appearing as a dim, blue-white star with a baseline apparent visual magnitude of 5.93.[3] It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s, and may come as close as 167 light-years around 8.5 million years from now.[3]

This is a magnetic chemically-peculiar star[11] with a stellar classification of B8 IIIp Si Sr,[4] showing abundance anomalies in silicon and strontium. The light variations of this star were discovered by J. E. Winzer in 1974.[12] It is an Alpha2 Canum Venaticorum-type variable with a period of 1.160898 days (or 7.0980 days[12]), ranging in magnitude from a high of 5.91 down to 5.98.[5] The surface magnetic field has a strength of (111.3±56.9)×10−4 T[13]

19 Lyrae has a moderate rotation rate, showing a projected rotational velocity of 35 km/s.[8] Stellar models give it an estimated 3.8[6] times the mass of the Sun and its girth is measured at 6.4[7] times the Sun's radius. It is radiating 397[3] times the luminosity of the Sun from its photosphere at an effective temperature of around 11,194 K.[6] The star has an absolute magnitude of −1.24,[3] which shows how bright the star would appear if it were located at a distance of 10 parsecs (33 ly) from the Sun.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference abt1995 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Martin2017 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference shulyak2014 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Abt2002 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Simbad was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference kochukhov2006 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Adelman1999 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference bychkov2009 was invoked but never defined (see the help page).