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Beta Gruis

{{Short description|Star in the constellation of Grus}}

{{Redirect|Tiaki|the Japanese proper name|Chiaki}}

{{Starbox begin

| name=Beta Gruis

}}

{{Starbox image

| image=

{{Location mark

|image=Grus constellation map.svg|alt=|float=center|width=240

|label=|position=right

|mark=Red circle.svg|mark_width=14|mark_link=Beta Gruis|x=413|y=712

}}

|caption=Location of β Gruis (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|22|42|40.05027}}

| dec = {{DEC|−46|53|04.4752}}

| appmag_v = 2.146 {{nowrap|(2.0 - 2.3)}}

| constell = Grus

}}

{{Starbox character

| type = AGB

| class = M4.5 III

| b-v = +1.620

| u-b = +1.757

| variable = SRb

}}

{{Starbox astrometry

| radial_v = +1.6

| prop_mo_ra = +135.16

| prop_mo_dec = −4.38

| parallax = 18.43

| p_error = 0.42

| parallax_footnote =

| absmag_v = {{Val|−1.61|0.052}}

}}

{{Starbox detail

| mass = 2.4

| radius = 154

| luminosity = {{val|3221|242|fmt=commas}}

| temperature = {{val|3508|125|fmt=commas}}

| gravity = 0.4

| metal_fe = 0.0

| rotational_velocity =

| age_myr = 450

}}

{{Starbox catalog

| names = Tiaki, Beta Gru, CD−47 14308, FK5 856, HR 8636, HD 214952, HIP 112122, SAO 231258.

}}

{{Starbox reference

| Simbad = HD+214952

}}

{{Starbox end}}

Beta Gruis (β Gruis, abbreviated Beta Gru, β Gru), formally named Tiaki {{IPAc-en|t|i|'|ɑː|k|i}},{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |accessdate=16 December 2017}} is the second brightest star in the southern constellation of Grus. It was once considered the rear star in the tail of the constellation of the (Southern) Fish, Piscis Austrinus: it, with Alpha, Delta, Theta, Iota, and Lambda Gruis, belonged to Piscis Austrinus in medieval Arabic astronomy.

Nomenclature

β Gruis (Latinised to Beta Gruis) is the star's Bayer designation.

It bore the traditional Tuamotuan name of Tiaki.{{cite web | url=https://www.iau.org/static/science/scientific_bodies/working_groups/280/wg-starnames-triennial-report-2015-2018.pdf | page=7 | title=WG Triennial Report (2015-2018) - Star Names |accessdate=2018-07-14}} In 2016, the IAU organized a Working Group on Star Names (WGSN){{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=22 May 2016}} to catalog and standardize proper names for stars. The WGSN approved the name Tiaki for this star on 5 September 2017 and it is now so included in the List of IAU-approved Star Names.

In Chinese, {{lang|zh|鶴}} ({{lang|zh-Latn|Hè}}), meaning Crane, refers to an asterism consisting of Beta Gruis, Alpha Gruis, Epsilon Gruis, Eta Gruis, Delta Tucanae, Zeta Gruis, Iota Gruis, Theta Gruis, Delta² Gruis and Mu¹ Gruis.{{in lang|zh}} 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}. Consequently, Beta Gruis itself is known as {{lang|zh|鶴二}} ({{lang|zh-Latn|Hè èr}}, {{langx|en|Second Star of the Crane}}).{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20081025110153/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm |date=2008-10-25 }}, Hong Kong Space Museum. Accessed on line November 23, 2010. The Chinese name gave rise to another English name, Ke.[https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Grus*.html Richard Hinckley Allen: Star Names — Their Lore and Meaning: Grus]

Properties

File:BetaGruLightCurve.png light curve for Beta Gruis, plotted from data published by Otero and Moon (2006). The inset plot shows the points plotted in red with an expanded scale.]]

Beta Gruis is a red giant star on the asymptotic giant branch with an estimated mass of about 2.4 times that of the Sun and a surface temperature of approximately 3,500 K, just over half the surface temperature of the Sun. This low temperature accounts for the dull red color of an M-type star. The total luminosity is about 3,200 times that of the Sun, and it has 150 times the Sun's radius.

It is one of the brightest stars at infrared and near-infrared wavelenghts. At the K band, it is the fifth-brightest star in the night sky.{{cite web|url=https://simbad.cds.unistra.fr/simbad/sim-sam?Criteria=Kmag+%3C+-3.22&submit=submit+query&OutputMode=LIST&maxObject=10000&CriteriaFile=|title=Kmag < -3.22|website=SIMBAD|access-date=July 1, 2024}}

Alan William James Cousins announced that Beta Gruis is a variable star in 1952.

Beta Gruis is a semiregular variable (SRb) star that varies in magnitude by about 0.4. It varies between intervals when it displays regular changes with a 37-day periodicity and times when it undergoes slow irregular variability.

{{clear left}}

References

{{Reflist|refs=

{{cite journal |last1=Cousins |first1=A. W. J. |title=Bright variable stars in southern hemisphere (second list) |journal=The Observatory |date=April 1952 |volume=72 |pages=86–87 |bibcode=1952Obs....72...86C |url=https://articles.adsabs.harvard.edu/pdf/1952Obs....72...86C |access-date=9 December 2024}}

{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 | s2cid=18759600 }}

{{citation | display-authors=1

| last1=Park | first1=Sunkyung | last2=Kang | first2=Wonseok

| last3=Lee | first3=Jeong-Eun | last4=Lee | first4=Sang-Gak

| title=Wilson-Bappu Effect: Extended to Surface Gravity

| journal=The Astronomical Journal

| volume=146 | issue=4 | pages=73 | year=2013

| doi=10.1088/0004-6256/146/4/73 | bibcode=2013AJ....146...73P

| arxiv=1307.0592 | s2cid=119187733 | postscript=. }}

{{Cite web |first=Jim |last=Kaler |title=Beta Gruis |url=http://stars.astro.illinois.edu/sow/betagru.html |access-date=2024-09-21 |website=stars.astro.illinois.edu}}

{{Cite journal |last1=McDonald |first1=I. |last2=Zijlstra |first2=A. A. |last3=Watson |first3=R. A. |date=2017-10-01 |title=Fundamental parameters and infrared excesses of Tycho-Gaia stars |bibcode=2017MNRAS.471..770M |journal=Monthly Notices of the Royal Astronomical Society |volume=471 |issue=1 |pages=770–791 |doi=10.1093/mnras/stx1433 |doi-access=free |arxiv=1706.02208 |issn=0035-8711}}

{{citation | last1=Gondoin | first1=P. | title=Evolution of X-ray activity and rotation on G-K giants | journal=Astronomy and Astrophysics | volume=352 | pages=217–227 |date=December 1999 | bibcode=1999A&A...352..217G }}

{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | journal=Veröff. Astron. Rechen-Inst. Heidelb | volume=35 | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | page=1 | bibcode=1999VeARI..35....1W }}

{{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | journal=Publ. Dept. Astron. Univ. Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | year=1966 | bibcode=1966PDAUC...1....1G }}

{{citation | author-link=Richard Hinckley Allen | last1=Allen | first1=R. H. | year=1963 | title=Star Names: Their Lore and Meaning | edition=rep | publisher=Dover Publications Inc. | location=New York, NY | isbn=0-486-21079-0 | page=[https://archive.org/details/starnamestheirlo00alle/page/238 238] }}

{{citation | last1=Otero | first1=S. A. | last2=Moon | first2=T. | title=The Characteristic Period of Pulsation of β Gruis | journal=The Journal of the American Association of Variable Star Observers | volume=34 | issue=2 | pages=156–164 |date=December 2006 | bibcode=2006JAVSO..34..156O }}

{{citation | last1=Judge | first1=P. G. | title=Constraints on the Outer Atmospheric Structure of Late Type Giant Stars with IUE Application to Alpha-Tauri K5III and Beta-Gruis M5III | journal=Monthly Notices of the Royal Astronomical Society | volume=223 | issue=2 | page=239 |date=November 1986 | bibcode=1986MNRAS.223..239J | doi = 10.1093/mnras/223.2.239 | doi-access=free }}

{{citation | last1=Engelke | first1=Charles W. | last2=Price | first2=Stephan D. | last3=Kraemer | first3=Kathleen E. | title=Spectral Irradiance Calibration in the Infrared. XVI. Improved Accuracy in the Infrared Spectra of the Secondary and Tertiary Standard Calibration Stars | journal=The Astronomical Journal | volume=132 | issue=4 | pages=1445–1463 |date=October 2006 | doi=10.1086/505865 | bibcode=2006AJ....132.1445E | doi-access=free }}

{{citation | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Beta+Gruis | title =V* bet Gru -- Variable Star | publisher=Centre de Données astronomiques de Strasbourg | work=SIMBAD | accessdate=2010-01-05 }}

{{Cite journal |last1=Răstău |first1=V. |last2=Mečina |first2=M. |last3=Kerschbaum |first3=F. |last4=Olofsson |first4=H. |last5=Maercker |first5=M. |last6=Drechsler |first6=M. |last7=Strottner |first7=X. |last8=Mulato |first8=L. |date=2023-12-01 |title=Extended far-UV emission surrounding asymptotic giant branch stars as seen by GALEX |url=https://www.aanda.org/articles/aa/abs/2023/12/aa46120-23/aa46120-23.html |journal=Astronomy & Astrophysics |language=en |volume=680 |pages=A12 |doi=10.1051/0004-6361/202346120 |issn=0004-6361|arxiv=2310.09056 |bibcode=2023A&A...680A..12R }}

{{cite journal

| last1=Eggen | first1=Olin J.

| title=Asymptotic giant branch stars near the sun

| journal=Astronomical Journal | volume=104 | issue=1 | date=July 1992 | pages=275–313

| doi=10.1086/116239 | bibcode=1992AJ....104..275E }}

}}

External links

  • [http://encarta.msn.com/encyclopedia_761587671/beta_gruis.html MSN Encarta] {{Webarchive|url=https://web.archive.org/web/20090829003314/http://encarta.msn.com/encyclopedia_761587671/Beta_Gruis.html |date=2009-08-29 }} ([https://web.archive.org/web/20090829003314/http://encarta.msn.com/encyclopedia_761587671/Beta_Gruis.html Archived] 2009-10-31)

{{Stars of Grus}}

{{Authority control}}

{{Sky|22|42|40.1|-|46|53|05|170}}

{{DEFAULTSORT:Beta Gruis}}

Category:M-type giants

Category:Semiregular variable stars

Category:Asymptotic-giant-branch stars

Category:Grus (constellation)

Gruis, Beta

Category:Durchmusterung objects

214952

112122

8636

Tiaki

Gruis, 057