Mu Crucis

{{Starbox begin

| name=Mu Crucis }}

{{Starbox observe 2s

| epoch=J2000

| equinox=

| constell=Crux

| component1=μ¹ Crucis

| ra1={{RA|12|54|35.6249}}

| dec1={{DEC|-57|10|40.527}}

| appmag_v1=4.03

| component2=μ² Crucis

| ra2={{RA|12|54|36.8865}}

| dec2={{DEC|−57|10|07.214}}

| appmag_v2=5.19

}}

{{Starbox character

| component1=μ¹ Cru

| class=B2IV-V

| b-v=−0.17

| u-b=−0.75

| variable=

| component2=μ² Cru

| class2=B5Vne

| b-v2=−0.11

| u-b2=−0.50

| variable2=

}}

{{Starbox astrometry

| component1 = μ¹ Cru

| radial_v=+13.9

| prop_mo_ra=−30.45

| prop_mo_dec=−13.55

| parallax=9.6267

| p_error=0.3611

| parallax_footnote=

| absmag_v=−1.49

| component2 = μ² Cru

| radial_v2=+13

| prop_mo_ra2=−32.35

| prop_mo_dec2=−10.93

| parallax2=8.9486

| p_error2=0.2264

| parallax_footnote2=

| absmag_v2=−0.40

}}{{Starbox detail

| component1 = μ¹ Cru

| mass=7.7

| radius=

| luminosity=1,123

| temperature=21,100

| gravity = 3.93

| metal_fe=−0.21

| rotation=

| rotational_velocity=

| age_myr=9.2

| component2 = μ² Cru

| mass2=5.0

| radius2=3.9

| luminosity2 = 205

| temperature2 = 20,400

| gravity2 = 3.40

| rotational_velocity2 = 210

| age_myr2=15.9

}}

{{Starbox catalog

| names=μ Cru, WD 12546-5711, CCDM 12546-5711

| component1 = μ¹ Cru

| names1=HR 4898, CD−56°4688, HD 112092, SAO 240366, HIP 63003

| component2 = μ² Cru

| names2=HR 4899, CD−56°4689, HD 112091, SAO 240367, HIP 63005

}}

{{Starbox reference

| Simbad = mu+Cru|sn=μ Cru

| Simbad2 = mu1+Cru|sn2=μ¹ Cru

| Simbad3 = mu2+Cru|sn3=μ² Cru

}}{{Starbox end}}

Mu Crucis, Latinized from μ Crucis, is the seventh-brightest star in the constellation Crux commonly known as the Southern Cross. μ Crucis is a wide double star of spectral class B stars, magnitude 4.0 and 5.2 respectively. They lie about 370 light-years away, and both stars are likely physically attached. The brighter component is known as μ¹ Crucis or μ Crucis A, while the fainter is μ² Crucis or μ Crucis B.

μ¹ Crucis is the brighter of the two stars with an apparent magnitude of 4.0. It is a hot massive main sequence or subgiant star, over a thousand times as luminous as the sun.

μ² Crucis is the fainter of the pair. Its apparent magnitude is 5.2 and it is a Be star, a star spinning so quickly that it has ejected a disc of material that creates emission lines in its spectrum. The disc is inclined at 36° to our line of sight.

References

{{reflist|refs=

{{cite journal|bibcode=1994A&A...282..867K|title=Chemical abundances in early B-type stars. V. Metal abundances and LTE/NLTE comparison|journal=Astronomy and Astrophysics|volume=282|pages=867|last1=Kilian|first1=J.|year=1994}}

{{cite journal | last=Perryman | first=M. A. C. |display-authors=etal | title=The HIPPARCOS Catalogue | journal=Astronomy & Astrophysics | volume=323 | pages=L49–L52 |date=April 1997 | bibcode=1997A&A...323L..49P }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{cite conference |last=Evans |first=D. S. |date=June 20–24, 1966 |editor1=Batten, Alan Henry |editor2=Heard, John Frederick |title=The Revision of the General Catalogue of Radial Velocities |book-title=Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 |location=University of Toronto |publisher=International Astronomical Union |bibcode=1967IAUS...30...57E }}

{{cite journal | author=Johnson, H. L. |author2=Iriarte, B. |author3=Mitchell, R. I. |author4=Wisniewskj, W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 |page=99 | bibcode=1966CoLPL...4...99J }}

{{cite journal|bibcode=2011MNRAS.410..190T|title=A catalogue of young runaway Hipparcos stars within 3 KPC from the Sun|journal=Monthly Notices of the Royal Astronomical Society|volume=410|issue=1|pages=190|last1=Tetzlaff|first1=N.|last2=Neuhäuser|first2=R.|last3=Hohle|first3=M. M.|year=2011|arxiv=1007.4883|doi=10.1111/j.1365-2966.2010.17434.x|doi-access=free |s2cid=118629873}}

{{cite journal|bibcode=2001A&A...378..861C|title=High and intermediate-resolution spectroscopy of be stars 4481 lines|journal=Astronomy and Astrophysics|volume=378|pages=861|last1=Chauville|first1=J.|last2=Zorec|first2=J.|last3=Ballereau|first3=D.|last4=Morrell|first4=N.|last5=Cidale|first5=L.|last6=Garcia|first6=A.|year=2001|doi=10.1051/0004-6361:20011202|url=http://ri.conicet.gov.ar/bitstream/11336/36962/2/CONICET_Digital_Nro.da657706-52b0-4788-843c-67c34222e14c_A.pdf|doi-access=free}}

{{cite journal|doi=10.1051/0004-6361:20066615|title=Be star disc characteristics near the central object|journal=Astronomy & Astrophysics|volume=470|issue=1|pages=239–247|year=2007|last1=Zorec|first1=J.|last2=Arias|first2=M. L.|last3=Cidale|first3=L.|last4=Ringuelet|first4=A. E.|bibcode=2007A&A...470..239Z|doi-access=free|hdl=11336/38181|hdl-access=free}}

{{cite journal|bibcode=2006MNRAS.371..252L|title=Spectroscopic analysis of southern B and be stars|journal=Monthly Notices of the Royal Astronomical Society|volume=371|issue=1|pages=252–262|last1=Levenhagen|first1=R. S.|last2=Leister|first2=N. V.|year=2006|arxiv=astro-ph/0606149|doi=10.1111/j.1365-2966.2006.10655.x|doi-access=free |s2cid=16492030}}

{{cite journal|bibcode=1969ApJ...157..313H|title=MK Spectral Types for Bright Southern OB Stars|journal=The Astrophysical Journal|volume=157|pages=313|last1=Hiltner|first1=W. A.|last2=Garrison|first2=R. F.|last3=Schild|first3=R. E.|year=1969|doi=10.1086/150069|doi-access=free}}

}}

Category:Binary stars

Crucis, Mu

Category:Crux

Category:B-type main-sequence stars

Category:B-type subgiants

Category:Lower Centaurus Crux

4898

112091 2

063003 5

Category:Durchmusterung objects

Category:Be stars