HD 111395

HD 111395

A visual band light curve for LW Comae Berenices, adapted from Strassmeier et al. (1997)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension 12h 48m 47.048s[2]
Declination +24° 50′ 24.82″[2]
Apparent magnitude (V) 6.29[3]
Characteristics
Evolutionary stage main sequence
Spectral type G7V[4]
B−V color index 0.703±0.002[3]
Variable type BY Dra[5]
Astrometry
Radial velocity (Rv)−8.936±0.0064[6] km/s
Proper motion (μ) RA: −334.908 mas/yr[2]
Dec.: −105.517 mas/yr[2]
Parallax (π)58.4858 ± 0.0293 mas[2]
Distance55.77 ± 0.03 ly
(17.098 ± 0.009 pc)
Absolute magnitude (MV)5.15[3]
Details
Mass1.08±0.04[7] M☉
Radius0.93±0.01[8] R☉
Luminosity0.799±0.001[8] L☉
Surface gravity (log g)4.543±0.05[7] cgs
Temperature5,649+38
−17[8] K
Metallicity [Fe/H]0.08±0.02[7] dex
Rotational velocity (v sin i)3.8±0.8[7] km/s
Age1.0[9] or 1.01−1.73[10] Gyr
Other designations
LW Com, BD+25°2568, FK5 3021, GJ 486.1, HD 111395, HIP 62523, HR 4864, SAO 82511[11]
Database references
SIMBADdata

HD 111395 is a single,[12] variable star in the northern constellation of Coma Berenices. It has the variable star designation LW Com, short for LW Comae Berenices;[5] HD 111395 is the Henry Draper Catalogue designation. The star has a yellow hue and is just bright enough to be barely visible to the naked eye with an apparent visual magnitude that fluctuates around 6.29.[3] Based upon parallax measurements, it is located at a distance of 55.8 light years from the Sun.[2] The star is drifting closer with a radial velocity of −8.9 km/s.[6] It is a member of the Eta Chamaeleontis stellar kinematic group.[13]

This object is a G-type main-sequence star with a stellar classification of G7V.[4] It is a BY Draconis variable that varies in brightness by about 0.10 magnitude over a period of 15.8 days,[5] which is interpreted as the rotation period of the star. (Messina et al. (2003) suspect the actual rotation period may be half that: 7.9 days.[14]) It has an active chromosphere[1] and is a source for X-ray emission.[15]

The star is around a billion years old with a projected rotational velocity of 3.8 km/s.[7] It has slightly above solar metallicity − the term astronomers use for the relative abundance of elements other than hydrogen and helium. The mass of the star is 8% greater than the Sun,[7] but it has 93% of the Sun's radius.[8] It is radiating 80% of the luminosity of the Sun from its photosphere at an effective temperature of 5649 K.[8] An infrared excess indicates a cold debris disk is orbiting the star at a distance of 17.48 AU with a mean temperature of 60 K. The disk has an estimated mass of 5.86×10−6 M🜨.[9]

  1. ^ a b Cite error: The named reference Strassmeier1997 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 Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Soubiran2013 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference McCarthy2014 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference gaspar2016 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Vican2012 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).
  12. ^ Cite error: The named reference Fuhrmann2017 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Nakajima2012 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Messina2003 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Greiner2015 was invoked but never defined (see the help page).