Gamma Gruis

{{Starbox image

| image =

{{Location mark

| image=Grus_IAU.svg

| float=center | width=250 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=γ Gru

| x%=63.2 | y%=32.4

}}

| caption=Location of γ Gruis (circled) near the center

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|21|53|55.72620}}

| dec = {{DEC|−37|21|53.4790}}

| appmag_v = 3.003

| constell = Grus

}}

{{Starbox character

| class = B8 III or B8IV-Vs

| b-v = −0.121

| u-b = −0.307

| variable =

}}

{{Starbox astrometry

| radial_v = −2.1

| prop_mo_ra = +98.07

| prop_mo_dec = −13.22

| parallax = 15.45

| p_error = 0.67

| parallax_footnote =

| absmag_v = −1.05

}}

{{Starbox detail

| mass = 3.06

| radius = 4.5

| luminosity = 373

| temperature = 12,520

| gravity = 3.79

| metal_fe =

| rotation = 4.987 d

| rotational_velocity = 57

| age_myr = 75

}}

{{Starbox catalog

| names = {{odlist | B=γ Gru, Gamma Gru | CD=−37°9119 | FK5=822 | GJ= | HD=207971 | HIP=108085 | HR=8353 | SAO=213374 | GC=30640 }}

}}

{{Starbox reference

| Simbad = gam+Gru

}}

Gamma Gruis or γ Gruis, formally named Aldhanab ({{IPAc-en|'|æ|l|d|@|n|æ|b}}),{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=16 December 2017}} is a star in the southern constellation of Grus (it once belonged to the Ptolemaic constellation Piscis Austrinus). With an apparent visual magnitude of 3.0, it is the third-brightest star in Grus. Based upon parallax measurements, this star is located at a distance of roughly {{Convert|211|ly|pc|abbr=off|lk=on}} from the Sun.

Nomenclature

γ Gruis (Latinised to Gamma Gruis) is the system's Bayer designation.

It bore the traditional Arabic name Al Dhanab, from the Arabic الذنب al-dhanab "the tail" (of the Southern Fish)when it was still part of Piscis Austrinus with the Bayer designation κ Piscis Austrini (Kappa Piscis Austrini). 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)|access-date=22 May 2016}} to catalog and standardize proper names for stars. The WGSN approved the name Aldhanab 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|敗臼}} ({{lang|zh-Latn|Bài Jiù}}), meaning Decayed Mortar, refers to an asterism consisting of Gamma Gruis, Lambda Gruis, Gamma Piscis Austrini and 19 Piscis Austrini.{{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, the Chinese name for Gamma Gruis itself is {{lang|zh|敗臼一}} ({{lang|zh-Latn|Bài Jiù yī}}, {{langx|en|the First Star of Decayed Mortar}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060705.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 5 日] {{Webarchive|url=https://web.archive.org/web/20110521232620/http://aeea.nmns.edu.tw/2006/0607/ap060705.html |date=2011-05-21 }}

Properties

Analysis of the spectrum by N. Houk in 1979 shows it to match a stellar classification of B8 III, with the luminosity class of III indicating this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. R. O. Gray and R. F. Garrison in 1989 found a less evolved class of B8IV-Vs. The luminosity of Gamma Gruis is around 390 times that of the Sun, with a significant portion of the energy emission being in the ultraviolet. Its outer envelope has an effective temperature of 12,520 K, which gives the star a blue-white hue. Gamma Gruis is rotating relatively rapidly with a projected rotational velocity of {{nowrap|57 km s⁻¹}}. By way of comparison, the Sun has an azimuthal velocity along its equator of just {{nowrap|2 km s⁻¹}}.

Based upon analysis of data collected during the Hipparcos mission, this star may have a proper motion companion that is causing gravitational perturbation of Gamma Gruis.

References

{{reflist|refs=

{{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

| 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=. }}

{{citation | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=3 | last1=Houk | first1=Nancy | location=Ann Arbor, Michigan | publisher=Dept. of Astronomy, University of Michigan | date=1979 | bibcode=1982mcts.book.....H }}

{{cite journal | last=Wilson | first=R. E. | date=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institute of Washington D.C. | bibcode=1953GCRV..C......0W }}

{{citation | display-authors=1 | last1=Royer | first1=F. | last2=Grenier | first2=S. | last3=Baylac | first3=M.-O. | last4=Gómez | first4=A. E. | last5=Zorec | first5=J. | title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i in the northern hemisphere | journal=Astronomy and Astrophysics | date=2002 | volume=393 | issue=3 | pages=897–911 | bibcode=2002A&A...393..897R | doi=10.1051/0004-6361:20020943 | arxiv=astro-ph/0205255 | s2cid=14070763 }}

{{cite journal | 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=Publications of the Department of Astronomy University of Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | date=1966 | bibcode=1966PDAUC...1....1G }}

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

{{citation | display-authors=1 | last1=Zorec | first1=J. | last2=Cidale | first2=L. | last3=Arias | first3=M. L. | last4=Frémat | first4=Y. | last5=Muratore | first5=M. F. | last6=Torres | first6=A. F. | last7=Martayan | first7=C. | title=Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ_1, D) parameters into Teff | journal=Astronomy and Astrophysics | volume=501 | issue=1 | pages=297–320 |date=July 2009 | doi=10.1051/0004-6361/200811147 | bibcode=2009A&A...501..297Z |arxiv = 0903.5134 | s2cid=14969137 }}

{{citation | first=James B. | last=Kaler | title=AL DHANAB (Gamma Gruis) | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/aldhanab.html | access-date=2012-02-11 }}

{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | pages=601–605 |date=November 1979 | issue=3 | bibcode=1979MNRAS.189..601U | doi=10.1093/mnras/189.3.601| doi-access=free }}

{{citation | last1=Frankowski | first1=A. | last2=Jancart | first2=S. | last3=Jorissen | first3=A. | title=Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data | journal=Astronomy and Astrophysics | volume=464 | issue=1 | pages=377–392 |date=March 2007 | doi=10.1051/0004-6361:20065526 | bibcode=2007A&A...464..377F |arxiv = astro-ph/0612449 | s2cid=14010423 }}

{{citation

| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.

| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets

| journal=The Astrophysical Journal

| volume=804 | issue=2 | pages=146 | year=2015

| bibcode=2015ApJ...804..146D | doi=10.1088/0004-637X/804/2/146

| arxiv=1501.03154 | s2cid=33401607 | postscript=. }}

{{citation

| title=The late A-type stars – Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation

| last1=Gray | first1=R. O. | last2=Garrison | first2=R. F.

| volume=70 | pages=623 | year=1989 | postscript=.

| journal=Astrophysical Journal Supplement Series

| doi=10.1086/191349 | bibcode=1989ApJS...70..623G | doi-access=free }}

{{cite journal | doi=10.3847/1538-4357/ac3335 | year=2022 | title=Rotation Signature of TESS B-type Stars. A Comprehensive Analysis | last1=Barraza | first1=L. F. | last2=Gomes | first2=R. L. | last3=Messias | first3=Y. S. | last4=Leão | first4=I. C. | last5=Almeida | first5=L. A. | last6=Janot-Pacheco | first6=E. | last7=Brito | first7=A. C. | last8=Brito | first8=F. A. C. | last9=Santana | first9=J. V. | last10=Gonçalves | first10=N. S. | last11=Das Chagas | first11=M. L. | last12=Teixeira | first12=M. A. | last13=De Medeiros | first13=J. R. | last14=Canto Martins | first14=B. L. | journal=The Astrophysical Journal | volume=924 | issue=2 | page=117 | arxiv=2202.01022 | bibcode=2022ApJ...924..117B | s2cid=246030494 | doi-access=free }}

}}

Category:B-type giants

Category:Grus (constellation)

Gruis, Gamma

Category:Durchmusterung objects

Gamma Gruis

Nomenclature

Properties

See also

References