Beta Corvi

{{Starbox begin

| name = β Corvi

}}

{{Starbox image

| image=

{{Location mark

|image=Corvus constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=β Corvi

|x=432|y=484

}}

|caption=Location of β Corvi (circled in red)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Corvus

| ra = {{RA|12|34|23.23484}}

| dec = {{DEC|−23|23|48.3374}}

| appmag_v = 2.647

}}

{{Starbox character

| class = G5 II

| u-b = +0.586

| b-v = +0.898

| r-i = +0.44

}}

{{Starbox astrometry

| radial_v = {{val|-7.34|0.08}}

| prop_mo_ra = +1.11

| prop_mo_dec = −56.56

| parallax = 22.39

| p_error = 0.18

| parallax_footnote =

| absmag_v = {{val|-0.651|0.033}}

}}

{{Starbox detail

| mass = {{val|3.32|0.06}}

| radius = {{val|15.84|0.72}}

| luminosity = {{val|175|13|12}}

| temperature = {{val|5325|28}}

| gravity = {{val|2.86|0.06}}

| age_myr = {{val|280|10}}

| metal_fe = {{val|0.14|0.02}}

| rotational_velocity = {{val|2.58|0.55}}

}}

{{Starbox catalog

| names = {{odlist | name=Kraz | B=β Crv, Beta Corvi, Beta Crv | F=9 Corvi, 9 Crv | BD=−22 3401 | CD=−22 3401, CD−22 9505 | CPD=−22 5388 | FK5=471 | GC=17133 | HD=109379 | HIP=61359 | HR=4786 | PPM=260512 | SAO=180915 }}

}}

{{Starbox reference

| Simbad=bet+crv

}}

Beta Corvi or β Corvi, officially named Kraz ({{IPAc-en|'|k|r|æ|z}}),{{cite web | url=https://www.iau.org/public/themes/naming_stars/ | title=Naming Stars |publisher=IAU.org |access-date=18 June 2018}} is the second-brightest star in the southern constellation of Corvus with an apparent visual magnitude of 2.647. Based on parallax measurements obtained during the Hipparcos mission, it is about {{Convert|146|ly|pc|abbr=off|lk=on}} distant from the Sun.

Nomenclature

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

In a 1951 publication, Atlas Coeli (Skalnate Pleso Atlas of the Heavens) by Czech astronomer Antonín Bečvář, it bore the name Kraz, whose origin and meaning remain unknown.{{cite book|author1=Kunitzch, Paul |author2=Smart, Tim | title=A Dictionary of Modern Star Names: A Short Guide to 254 Star Names and Their Derivations |year=2006 | publisher=Sky Publishing Corporation |location=Cambridge, Massachusetts |isbn=978-1-931559-44-7 | orig-year=1986|page=62}}

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 Kraz for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.

In Chinese, {{lang|zh|軫宿}} ({{lang|zh-Latn|Zhěn Sù}}), meaning Chariot (asterism), refers to an asterism consisting of Beta, Gamma, Epsilon and Delta Corvi.{{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 Corvi itself is known as {{lang|zh|軫宿四}} ({{lang|zh-Latn|Zhěn Sù sì}}, {{langx|en|the Fourth Star of Chariot}}).{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_h_l.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20110129031951/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_h_l.htm |date=2011-01-29 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.

Properties

Beta Corvi has about 3.3 times the Sun's mass and is roughly 300 million years old, which is old enough for a star of this mass to consume the hydrogen at its core and evolve away from the main sequence. The stellar classification is G5 II, with the luminosity class of 'II' indicating this is a bright giant. The effective temperature of the star's outer envelope is about 5,325 K, which produces a yellow hue common to G-type stars.

Currently, Beta Corvi has expanded to 15.8 times the Sun's size and is emitting about 175 times the luminosity of the Sun. The abundance of elements other than hydrogen or helium, what astronomers term metallicity, is 1.38 times that of the Sun.{{efn|name=metal_fe}}

This is a variable star that ranges in apparent visual magnitude from a low of 2.66 to a high of 2.60.

Notes

{{Notelist|notes=

{{efn|name=metal_fe|1 = The abundance is estimated by taking [Fe/H] to the power of ten:{{indent|10}}10^[Fe/H] = 10^+0.14 = 1.38}}

}}

References

{{Reflist|30em|refs=

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| title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood | journal=Monthly Notices of the Royal Astronomical Society | volume=402 | issue=2 | pages=1369–1379 |date=February 2010 | doi=10.1111/j.1365-2966.2009.15979.x | doi-access=free | bibcode=2010MNRAS.402.1369L |arxiv = 0911.1335 | s2cid=119096173 }}

{{citation | first1=James B. | last1=Kaler | work=Stars | title=KRAZ (Beta Corvi) | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/kraz.html | access-date=2012-12-28 }}

[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=4786 HR 4786], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line September 9, 2008.

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{{SIMBAD link|bet+crv|SV* ZI 946 -- Variable Star}}, database entry, SIMBAD. Accessed on line September 9, 2008.

{{Cite journal |last1=Rosas-Portilla |first1=F. |last2=Schröder |first2=K.-P. |last3=Jack |first3=D. |date=2022-04-26 |title=On the physical nature of the Wilson-Bappu effect: revising the gravity and temperature dependence |arxiv=2203.16593 |bibcode=2022csss.confE.216R |journal=Monthly Notices of the Royal Astronomical Society |volume=513 |issue=1 |pages=906–924 |doi=10.1093/mnras/stac929 |doi-access=free |issn=0035-8711}}

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{{Cite journal |last1=Jofré |first1=E. |last2=Petrucci |first2=R. |last3=Saffe |first3=C. |last4=Saker |first4=L. |last5=Artur de la Villarmois |first5=E. |last6=Chavero |first6=C. |last7=Gómez |first7=M. |last8=Mauas |first8=P. J. D. |date=2015-02-01 |title=Stellar parameters and chemical abundances of 223 evolved stars with and without planets |bibcode=2015A&A...574A..50J |journal=Astronomy and Astrophysics |volume=574 |pages=A50 |doi=10.1051/0004-6361/201424474 |issn=0004-6361|arxiv=1410.6422 }} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/574/A50&Name=HD%20109379 Beta Corvi's database entry] at VizieR.

}}

Category:G-type bright giants

Category:Corvus (constellation)

Beta Corvi

Nomenclature

Properties

See also

Notes

References