AR Lacertae

AR Lacertae

A light curve for AR Lacertae, plotted from TESS data,[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lacerta
Right ascension 22h 08m 40.818s[2]
Declination +45° 44′ 32.11″[2]
Apparent magnitude (V) 6.080
Min1 6.770
Min2 6.430[3]
Characteristics
Evolutionary stage Subgiants[4]
Spectral type K0IVe + G2IV[4] + DA(?)[5]
B−V color index 0.567±0.008[6]
Variable type Algol/RS CVn[3]
Astrometry
Radial velocity (Rv)−33.84±0.26[7] km/s
Proper motion (μ) RA: −52.310 mas/yr[2]
Dec.: +46.931 mas/yr[2]
Parallax (π)23.5246 ± 0.0228 mas[2]
Distance138.6 ± 0.1 ly
(42.51 ± 0.04 pc)
Absolute bolometric
magnitude (Mbol)		2.75±0.066
Orbit[8]
Period (P)1.98395±0.00002 d
Semi-major axis (a)8.869±0.015 R☉
Eccentricity (e)0.00 (adopted)
Inclination (i)90° (adopted)°
Longitude of the node (Ω)6.9207±0.0128°
Periastron epoch (T)2451745.5794 ± 0.0002 HJD
Details
Cooler (K0) component
Mass1.21±0.077[8] M☉
Radius2.61±0.009[8] R☉
Luminosity (bolometric)3.55[9] L☉
Surface gravity (log g)3.69±0.035[8] cgs
Temperature5,100[10] K
Rotational velocity (v sin i)73[4] km/s
Hotter (G5) component
Mass1.17±0.035[8] M☉
Radius1.51±0.005[8] R☉
Luminosity (bolometric)2.09[9] L☉
Temperature5,826[10] K
Rotational velocity (v sin i)46[4] km/s
Other designations
13 Cet, AR Lac, BD+45°3813, GC 30985, HD 210334, HIP 109303, HR 8448, SAO 51684, WDS J22087+4545AB[11]

AR Lacertae is a frequently-studied[8] triple star system in the northern constellation of Lacerta, abbreviated AR Lac. This variable star system is the prototype for "detached systems of the AR Lacertae type".[3] It is dimly visible to the naked eye with a combined peak apparent visual magnitude of 6.08.[3] Based on parallax measurements, AR Lac is located at a distance of 138.6 light years from the Sun. It is drifting closer with a heliocentric radial velocity of −34 km/s.[7]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Karakuş_Ekmekçi_2021 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Bickle_et_al_2022 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Karataș_et_al_2004 was invoked but never defined (see the help page).
  8. ^ a b c d e f g Cite error: The named reference Siviero_et_al_2006 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Popper_1990 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Lu_et_al_2012 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).