Mu Librae

Mu Librae
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Libra
Right ascension	14h 49m 19.05130s
Declination	−14° 08′ 56.4766″
Apparent magnitude (V)	5.32 (5.69 + 6.72 + 14.70)
Characteristics
Spectral type	A1pSrCrEu + A6m
B−V color index	+0.07
Astrometry
Radial velocity (Rv)	−3.2±1.4 km/s
Proper motion (μ)	RA: −65.95 mas/yr ; Dec.: −14.54 mas/yr
Parallax (π)	13.71±0.69 mas
Distance	240 ± 10 ly ; (73 ± 4 pc)
Absolute magnitude (MV)	1.32±0.20
Details
μ Lib A
Mass	2.31±0.12 M☉
Radius	2.59 R☉
Luminosity	41.7 L☉
Temperature	9,592±260 K
Rotational velocity (v sin i)	29.0±1.7 km/s
Age	417 Myr
μ Lib B
Radius	2.59 R☉
Rotational velocity (v sin i)	32.0±6 km/s
Other designations
	μ Lib, BD−13°3986, HD 130559, HIP 72489, HR 5523, SAO 158821
Database references
SIMBAD	data

μ Librae (Latinised as Mu Librae) is 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]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
^ ^a ^b ^c ^d ^e ^f ^g Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ ^a ^b Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ ^a ^b Kochukhov, O.; Bagnulo, S. (2006), "Evolutionary state of magnetic chemically peculiar stars", Astronomy and Astrophysics, 450 (2): 763, arXiv:astro-ph/0601461, Bibcode:2006A&A...450..763K, doi:10.1051/0004-6361:20054596, S2CID 18596834.
^ ^a ^b ^c ^d ^e ^f Wraight, K. T.; et al. (February 2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 420 (1): 757–772, arXiv:1110.6283, Bibcode:2012MNRAS.420..757W, doi:10.1111/j.1365-2966.2011.20090.x, S2CID 14811051.
^ ^a ^b ^c ^d Howe, K. S.; Clarke, C. J. (January 2009), "An analysis of v sin (i) correlations in early-type binaries", Monthly Notices of the Royal Astronomical Society, 392 (1): 448–454, Bibcode:2009MNRAS.392..448H, doi:10.1111/j.1365-2966.2008.14073.x.
^ "mu. Lib". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-24.{{cite web}}: CS1 maint: postscript (link)
^ Mason, Brian D.; et al. (October 2007), "Speckle Interferometry at the US Naval Observatory. XIII.", The Astronomical Journal, 134 (4): 1671–1678, Bibcode:2007AJ....134.1671M, doi:10.1086/521555, S2CID 250820656.

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

[Corben1968-2] Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.

[Eggleton2008-3] ^ ^a ^b ^c ^d ^e ^f ^g Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.

[Mason2014-4] Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466, Bibcode:2001AJ....122.3466M, doi:10.1086/323920, retrieved 2015-07-22.

[deBruijne2012-5] Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.

[Kochukhov2006-6] Kochukhov, O.; Bagnulo, S. (2006), "Evolutionary state of magnetic chemically peculiar stars", Astronomy and Astrophysics, 450 (2): 763, arXiv:astro-ph/0601461, Bibcode:2006A&A...450..763K, doi:10.1051/0004-6361:20054596, S2CID 18596834.

[Wraight2012-7] ^ ^a ^b ^c ^d ^e ^f Wraight, K. T.; et al. (February 2012), "A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars", Monthly Notices of the Royal Astronomical Society, 420 (1): 757–772, arXiv:1110.6283, Bibcode:2012MNRAS.420..757W, doi:10.1111/j.1365-2966.2011.20090.x, S2CID 14811051.

[Howe2009-8] Howe, K. S.; Clarke, C. J. (January 2009), "An analysis of v sin (i) correlations in early-type binaries", Monthly Notices of the Royal Astronomical Society, 392 (1): 448–454, Bibcode:2009MNRAS.392..448H, doi:10.1111/j.1365-2966.2008.14073.x.

[SIMBAD-9] "mu. Lib". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-24.{{cite web}}: CS1 maint: postscript (link)

[Mason2007-10] Mason, Brian D.; et al. (October 2007), "Speckle Interferometry at the US Naval Observatory. XIII.", The Astronomical Journal, 134 (4): 1671–1678, Bibcode:2007AJ....134.1671M, doi:10.1086/521555, S2CID 250820656.

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Mu Librae

References

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