Zeta2 Librae

{{Short description|Alpha2 Canum Venaticorum variable in Libra}} {{hatnote|For other star systems with a similar [[Bayer designation]], see [[Zeta Librae]].}} {{DISPLAYTITLE:Zeta² Librae}} {{Starbox begin |name=Zeta² Librae}} {{Starbox image | image = {{Location mark |image=Libra constellation map.svg|alt=|float=center|width=280 |label=|position=right |mark=Red circle.svg|mark_width=12|mark_link=ζ Lib |x=368|y=456 }} |caption=Location of ζ² Librae (circled) }} {{Starbox observe |epoch=[[J2000.0]] |constell=[[Libra (constellation)|Libra]] |ra={{RA|15|29|34.7424}}<ref name=GaiaDR3/> |dec={{DEC|-17|26|27.378}}<ref name=GaiaDR3/> |appmag_v=6.66 - 6.71<ref name=gcvs/> }} {{Starbox character |type=[[main sequence]]<ref name=GaiaDR3/> |class=F0VspEuGdSr<ref name=abt1979/> |variable=[[Rapidly oscillating Ap star|roAp]]<ref name=gcvs/> }} {{Starbox astrometry |prop_mo_ra=−68.387 |prop_mo_dec=+7.364 |pm_footnote = <ref name=GaiaDR3/> |parallax= 12.6122 |p_error= 0.0334 |parallax_footnote=<ref name=GaiaDR3/> }} {{Starbox detail |mass=1.7<ref name=GaiaDR3/> |temperature=7,543<ref name=GaiaDR3/> |luminosity=9.7<ref name=GaiaDR3/> |radius=1.8<ref name=GaiaDR3/> |gravity=4.15<ref name=GaiaDR3/> |metal_fe=0.39<ref name=GaiaDR3/> |age_myr=977<ref name=GaiaDR3/> }} {{starbox catalog |names=33 Librae, GZ Librae, HD 137949, HIP 75848, 2MASS J15293475-1726274, BD-16 4093, GSC 06188-01530, SAO 159292, TYC 6188-1520-1, WDS J15296-1726A }} {{Starbox reference |Simbad=GZ+Lib }} {{Starbox end}} '''ζ² Librae''' (abbreviated Zeta² Librae, Zeta² Lib, ζ² Lib), also known as '''33 Librae''', is a variable [[star]] in the [[constellation]] [[Libra (constellation)|Libra]]. It is approximately 260 [[light-year]]s away from the [[Sun]].<ref name="GaiaDR3"/>

Zeta² Librae does not have an HR number, although it is included in the Bright Star Catalogue Supplement.<ref name=hr/><ref name=supplement/>

== Characteristics == [[File:GZLibLightCurve.png|thumb|left|A [[light curve]] for Zeta² Librae, adapted from Wraight ''et al.'' (2012)<ref name="Wraight"/>]] 33 Librae is an [[F-type star|F-type]] [[main sequence star]], and show abundance of [[europium]], [[gadolinium]] and [[strontium]] in the spectrum.<ref name=abt1979/> It is a [[rapidly oscillating Ap star]].<ref name=gcvs/> It bears the [[variable star designation]] '''GZ Librae'''. {{clear left}}

== See also == * [[List of stars in Libra]]

== References == <references>

<ref name=GaiaDR3>{{cite Gaia DR3|6258378305082833408}}</ref>

<ref name=gcvs>{{cite journal |bibcode=2017ARep...61...80S |title=General catalogue of variable stars: Version GCVS 5.1 |last1=Samus' |first1=N. N. |last2=Kazarovets |first2=E. V. |last3=Durlevich |first3=O. V. |last4=Kireeva |first4=N. N. |last5=Pastukhova |first5=E. N. |journal=Astronomy Reports |date=2017 |volume=61 |issue=1 |page=80 |doi=10.1134/S1063772917010085 }}</ref>

<ref name=abt1979>{{cite journal |bibcode=1979PASP...91..176A |title=Spectral types of stars with unusual photometric indices |last1=Abt |first1=H. A. |last2=Brodzik |first2=D. |last3=Schaefer |first3=B. |journal=Publications of the Astronomical Society of the Pacific |date=1979 |volume=91 |page=176 |doi=10.1086/130467 }}</ref>

<ref name="Wraight">{{cite journal | last1=Wraight | first1=K. T. | last2=Fossati | first2=L. | last3=Netopil | first3=M. | last4=Paunzen | first4=E. | last5=Rode-Paunzen | first5=M. | last6=Bewsher | first6=D. | last7=Norton | first7=A. J. | last8=White | first8=Glenn J. | title=A photometric study of chemically peculiar stars with the STEREO satellites - I. Magnetic chemically peculiar stars | journal=Monthly Notices of the Royal Astronomical Society | date=February 2012 | volume=420 | issue=1 | pages=757–772 | bibcode=2012MNRAS.420..757W | doi=10.1111/j.1365-2966.2011.20090.x | doi-access=free | arxiv=1110.6283 }}</ref>

<ref name=supplement>{{cite journal | bibcode=1982bsc..book.....H|title=The Bright Star Catalogue. Fourth revised edition. (Containing data compiled through 1979) | journal=The Bright Star Catalogue. Fourth Revised Edition. (Containing Data Compiled Through 1979) | last1=Hoffleit | first1=D. | last2=Jaschek | first2=C. | year=1982}}</ref>

<ref name=hr>{{cite journal | bibcode=1995yCat.5050....0H | title=VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991) | journal=VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H | volume=5050 | last1=Hoffleit | first1=D. | last2=Warren | first2=W. H. | year=1995 }}</ref>

</references> {{Sky|15|29|34|742|-17|26|27|38}} {{Stars of Libra}}

[[Category:Libra (constellation)]] [[Category:F-type main-sequence stars]] [[Category:Alpha2 Canum Venaticorum variables]] [[Category:Henry Draper Catalogue objects|137949]] [[Category:Hipparcos objects|075848]] [[Category:Rapidly oscillating Ap stars]] [[Category:Objects with variable star designations|Librae, GZ]]