Mu Librae

Mu Librae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Libra
Right ascension 14h 49m 19.05130s[1]
Declination −14° 08′ 56.4766″[1]
Apparent magnitude (V) 5.32[2] (5.69 + 6.72[3] + 14.70[4])
Characteristics
Spectral type A1pSrCrEu + A6m[3]
B−V color index +0.07[2]
Astrometry
Radial velocity (Rv)−3.2±1.4[5] km/s
Proper motion (μ) RA: −65.95[1] mas/yr
Dec.: −14.54[1] mas/yr
Parallax (π)13.71 ± 0.69 mas[1]
Distance240 ± 10 ly
(73 ± 4 pc)
Absolute magnitude (MV)1.32±0.20[6]
Details
μ Lib A
Mass2.31±0.12[7] M☉
Radius2.59[8] R☉
Luminosity41.7[7] L☉
Temperature9,592±260[7] K
Rotational velocity (v sin i)29.0±1.7[7] km/s
Age417[6] Myr
μ Lib B
Radius2.59[8] R☉
Rotational velocity (v sin i)32.0±6[8] km/s
Other designations
μ Lib, BD−13° 3986, HD 130559, HIP 72489, HR 5523, SAO 158821.[9]
Database references
SIMBADdata

μ Librae (Latinised as Mu Librae) is the Bayer designation for a probable triple star[3] system in the zodiac constellation of Libra. They have a combined apparent visual magnitude of 5.32,[2] which is bright enough to be faintly visible to the naked eye. With an annual parallax shift of 13.71 mas,[1] the system is located at an estimated distance of around 240 light years.

The inner pair consists of two A-type stars that, as of 2006, had an angular separation of 1.79 arc seconds along a position angle of 5.5°.[10] They have an estimated physical separation of 139 AU.[8] The primary, component A, is a visual magnitude 5.69[3] magnetic Ap star showing overabundances of the elements aluminum, strontium, chromium, and europium.[7] Hence, it has a stellar classification of A1pSrEuCr.[3] It is a photometric variable with periods of 25.3992±0.1970 d and 1.8871±0.0008 d. The surface magnetic field strength is 1,375 Gauss.[7]

The secondary, component B, is an Am star with a stellar classification of A6m.[3] It has a visual magnitude of 6.72.[3] The tertiary member, component C, is a magnitude 14.70 star at an angular separation of 12.90 arc seconds along a position angle of 294°, as of 2000.[4]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Mason2014 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Kochukhov2006 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Wraight2012 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Howe2009 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mason2007 was invoked but never defined (see the help page).