16 Lyrae

16 Lyrae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 01m 26.38228s[1]
Declination +46° 56′ 05.1398″[1]
Apparent magnitude (V) 5.00[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A6 IV[4] or A7 V[5]
B−V color index +0.186±0.005[2]
Astrometry
Radial velocity (Rv)+4.9±0.9[2] km/s
Proper motion (μ) RA: +22.239[1] mas/yr
Dec.: −80.409[1] mas/yr
Parallax (π)25.9005 ± 0.1377 mas[1]
Distance125.9 ± 0.7 ly
(38.6 ± 0.2 pc)
Absolute magnitude (MV)+2.13[2]
Details
Mass1.80±0.01[3] M☉
Radius1.87+0.04
−0.09[1] R☉
Luminosity12.043±0.079[1] L☉
Surface gravity (log g)4.28[6] cgs
Temperature7870+191
−93[1] K
Rotational velocity (v sin i)124[3] km/s
Age791[6] Myr
Other designations
16 Lyr, NSV 11677, BD+46°2602, HD 177196, HIP 93408, HR 7215, SAO 48011, WDS J19014+4656A, GSC 03545-03041[7]
Database references
SIMBADdata

16 Lyrae is a suspected astrometric binary[8] star system in the constellation Lyra,[7] located 126 light years away from the Sun based on parallax.[1] It is visible to the naked eye as a dim, white-hued star with a combined apparent visual magnitude of 5.00.[2] The system is moving further away from the Earth with a heliocentric radial velocity of +5 km/s.[2] It is a suspected member of the Ursa Major Moving Group stream.[9]

Cowley et al. (1969) found a stellar classification of A7 V[5] for the visible component, matching an A-type main-sequence star that is generating energy through hydrogen fusion at its core. Abt and Morrell (1995) instead listed a class of A6 IV,[4] suggesting it has left the main sequence and become a subgiant star. It is 791[6] million years old with a high rate of spin, showing a projected rotational velocity of 124 km/s.[3] This system is a source for X-ray emission with a luminosity of 105.3×1020 W, which is most likely coming from the unseen companion.[10]

  1. ^ a b c d e f g h i 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 c d Cite error: The named reference Zorec2012 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 Cowley1969 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Simbad was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference king2003 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).