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A SLIIIGHT rewrite. It's mostly a clean up.
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{{Starbox image
{{Starbox image
| image=
| image=
{{Location mark
{{Location mark
|image=Caelum constellation map.svg|alt=|float=center|width=280
| image = Caelum constellation map.svg | float = center | width = 250
|label=|position=right
| label = | position = right
|mark=Red circle.svg|mark_width=10|mark_link=RV Caeli
| mark = Red circle.svg | mark_width = 10| mark_link = RV Caeli
|x=634|y=592
| x = 634| y = 592
}}
| caption=Location of RV Caeli (circled)
}}
}}
{{Starbox observe
|caption=Location of RV Caeli (circled)
| epoch = J2000
| constell = [[Caelum]]
| ra = {{RA|04|28|09.46368}}<ref name = GaiaDR3/>
| dec = {{DEC|-41|51|35.4013}}<ref name = GaiaDR3/>
| appmag_v = 6.4{{±|0.01}}<ref name = Tycho2000/>
}}
}}
{{Starbox observe |
{{Starbox character
| type = [[Asymptotic giant branch|AGB]]<ref name = Eggen1992/>
epoch=J2000 |
ra={{RA|04|28|09.4637}}<ref name =Ga1a/> |
| class = M1 III<ref name = Houk1978/>
| b-v = +1.64<ref name = Johnson1966/>
dec={{DEC|-41|57|35.396}}<ref name =Ga1a>{{Cite journal|last=Gaia Collaboration|date=2018-04-01|title=VizieR Online Data Catalog: Gaia DR2 (Gaia Collaboration, 2018)|bibcode=2018yCat.1345....0G|journal=VizieR Online Data Catalog|volume=1345}}</ref> |
| variable=[[Semiregular variable|semiregular]]<ref name="AAVSO"/>
appmag_v=6.41<ref name=xhip>{{cite journal
}}
| title=XHIP: An extended hipparcos compilation
{{Starbox astrometry
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| radial_v = 97.9{{±|0.5}}<ref name = Gontcharov2006/>
| journal=Astronomy Letters
| parallax = 2.4402
| volume=38 | issue=5 | pages=331 | year=2012
| p_error = 0.0229
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
| parallax_footnote = <ref name = GaiaDR3/>
| arxiv=1108.4971 | s2cid=119257644 }}</ref> |
| prop_mo_ra = −14.75
constell=[[Caelum (constellation)|Caelum]] }}
| prop_mo_dec = +2.87
{{Starbox character |
| pm_footnote = <ref name = VanLeeuwen2007/>
class=M1III<ref name=houk1978>{{cite book | last1=Houk | first1=Nancy | title=Michigan catalogue of two-dimensional spectral types for the HD stars| publisher=Ann Arbor: Dept. Of Astronomy, University of Michigan | volume=2 | pages= | year=1978 | bibcode=1978MSS...C02....0H }}</ref> |
| absmag_v= −1.36<ref name = Anderson2012/>
r-i = |
}}
v-r = |
{{Starbox detail
u-b = |
| mass = 1.14<ref name = Anders2019/>
variable=[[Semiregular variable|semiregular]]<ref name="AAVSO"/> }}
| radius = 107<ref name = Kervella2021/>
{{Starbox astrometry |
radial_v={{val|97.90|0.30}}<ref name =Ga1a/> |
| luminosity= 976{{±|30}}<ref name = GaiaDR2/>
| temperature= 3,843{{±|122}}<ref name = Stassun2019/>
prop_mo_ra={{val|-14.75|0.37}} |
| metal_fe = −0.15<ref name = Anders2019/>
prop_mo_dec={{val|2.87|0.40}} |
| gravity= 0.67<ref name = Anders2019/>
parallax=2.7124 |
| age_gyr =
p_error=0.0633 |
}}
parallax_footnote=<ref name =Ga1a/> |pm_footnote=<ref name =h1p>{{Cite journal|last=van Leeuwen|first=F.|date=2007-11-01|title=Validation of the new Hipparcos reduction|bibcode=2007A&A...474..653V|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653–664|doi=10.1051/0004-6361:20078357|arxiv=0708.1752|s2cid=18759600|issn=0004-6361}}</ref> |
{{Starbox catalog
absmag_v=−1.36<ref name=xhip/>}}
| names = {{odlist| HR = 1429 | CD = −42°1510 | HD = 28552 | HIP = 20856 | SAO = 216821 | CPD = −42°469 | GC = 5451 | Gould = 4 G. Caeli<ref name = Gould1879/>}}<ref name = SIMBAD/>
{{Starbox detail|
}}
mass=1.14<ref name =1MASS/> |
{{Starbox reference
radius=65.57<ref name =ga2a>{{Cite journal|last1=Gaia Collaboration|last2=Brown|first2=A. G. A.|last3=Vallenari|first3=A.|last4=Prusti|first4=T.|last5=de Bruijne|first5=J. H. J.|last6=Babusiaux|first6=C.|last7=Bailer-Jones|first7=C. A. L.|last8=Biermann|first8=M.|last9=Evans|first9=D. W.|last10=Eyer|first10=L.|last11=Jansen|first11=F.|date=2018-08-01|title=Gaia Data Release 2. Summary of the contents and survey properties|bibcode=2018A&A...616A...1G|journal=Astronomy and Astrophysics|volume=616|pages=A1|doi=10.1051/0004-6361/201833051|arxiv=1804.09365|s2cid=49211658|issn=0004-6361}}</ref> |
| Simbad = HD+28552
luminosity=975<ref name =ga2a/> |
temperature=3984<ref name =ga2a/> |
metal= |
gravity=0.67<ref name =1MASS>{{Cite journal|last1=Anders|first1=F.|last2=Khalatyan|first2=A.|last3=Chiappini|first3=C.|last4=Queiroz|first4=A. B.|last5=Santiago|first5=B. X.|last6=Jordi|first6=C.|last7=Girardi|first7=L.|last8=Brown|first8=A. G. A.|last9=Matijevic|first9=G.|last10=Monari|first10=G.|last11=Cantat-Gaudin|first11=T.|date=2019-08-01|title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18|bibcode=2019A&A...628A..94A|journal=Astronomy and Astrophysics|volume=628|pages=A94|doi=10.1051/0004-6361/201935765|arxiv=1904.11302|s2cid=131780028|issn=0004-6361}}</ref> |
rotation= |
age= }}
{{Starbox catalog |
names={{odlist|HR=1429 |CD=−42°1510 |HD=28552 |HIP=20856 |SAO=216821 }}}}
{{Starbox reference |
Simbad=HD+28552
}}
}}
{{Starbox end}}
{{Starbox end}}


'''RV Caeli''' is a [[red giant]] star in the [[constellation]] [[Caelum]]. With an apparent magnitude of 6.4, it's barely visible to the naked eye, but this can vary. RV Caeli has a high radial velocity, which means it's moving away from the [[Solar System]], and is currently located {{Convert|1,200|ly|pc}} away using parallax.
'''RV Caeli''', also known as '''HD 28552''', is a solitary, red hued [[variable star]] located in the southern [[constellation]] [[Caelum]], the chisel. It has an [[apparent magnitude]] of 6.4,<ref name = Tycho2000/> placing it near the limit for [[naked eye]] visibility. The object is located relatively far at a distance of 1,340 [[light year]]s based on [[parallax]] measurements from [[Gaia DR3]],<ref name = GaiaDR3/> but is rapidly receding with a heliocentric [[radial velocity]] of {{val|98|ul=km/s}}.<ref name = Gontcharov2006/>


== Properties ==
This star is a red giant which has exhausted hydrogen at its core. It has a similar mass to the [[Sun]], but has ballooned to 65 times the radius. It a very luminous star, with a luminosity about 1,000 times greater than our Sun. RV Caeli has a cool effective temperature of 3,984 K, which gives it a red hue. It is considered to be on the [[asymptotic giant branch]], having exhausted its core hydrogen and helium.<ref name=eggen1992>{{cite journal
| last1=Eggen | first1=Olin J.
| title=Asymptotic giant branch stars near the sun
| journal=Astronomical Journal
| volume=104 | issue=1 | pages=275–313 | date=July 1992
| doi=10.1086/116239 | bibcode=1992AJ....104..275E }}</ref>

== Variability ==
[[File:RVCaeLightCurve.png|thumb|left|A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for RV Caeli, adapted from Tabur ''et al.'' (2009).<ref name="Tabur"/>]]
[[File:RVCaeLightCurve.png|thumb|left|A [[Photometric_system#Photometric_letters|visual band]] [[light curve]] for RV Caeli, adapted from Tabur ''et al.'' (2009).<ref name="Tabur"/>]]
[[Hipparcos]] has found it to vary between its [[Hipparcos#Photometric observations|photometric values]] of 6.44 and 6.56,<ref name="AAVSO">{{cite web|author=VSX|date=25 August 2009|title=RV Cae|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=4525|work=International Variable Star Index|publisher=[[American Association of Variable Star Observers]]|access-date=30 June 2014}}</ref> which roughly corresponds with the [[apparent magnitude|magnitude as seen with the naked eye]]. It was first suspected of variability in 1970.<ref>{{cite journal |bibcode=1970ApJ...161..199E |title=Narrow-Band and Broad-Band Photometry of Red Stars. III. Southern Giants |last1=Eggen |first1=O. J. |last2=Stokes |first2=N. R. |journal=The Astrophysical Journal |year=1970 |volume=161 |page=199 |doi=10.1086/150525 }}</ref> A 1982 survey again identified suspected variations, but could not confirm it was a variable star.<ref name=rufener>{{cite journal|bibcode=1982A&AS...48..503R|title=List of 333 variable, microvariable or suspected variable stars detected in the Geneva photometry|journal=Astronomy and Astrophysics Supplement Series|volume=48|pages=503|last1=Rufener|first1=F.|last2=Bartholdi|first2=P.|year=1982}}</ref> It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the [[variable star designation]] RV Caeli.<ref name=ibvs>{{cite journal|bibcode=1999IBVS.4659....1K|title=The 74th Special Name-list of Variable Stars|journal=Information Bulletin on Variable Stars|volume=4659|pages=1|last1=Kazarovets|first1=E. V.|last2=Samus|first2=N. N.|last3=Durlevich|first3=O. V.|last4=Frolov|first4=M. S.|last5=Antipin|first5=S. V.|last6=Kireeva|first6=N. N.|last7=Pastukhova|first7=E. N.|year=1999}}</ref>
[[Hipparcos]] has found it to vary between its [[Hipparcos#Photometric observations|photometric values]] of 6.44 and 6.56,<ref name="AAVSO"/> which roughly corresponds with the [[apparent magnitude|magnitude as seen with the naked eye]]. It was first suspected of variability in 1970,<ref name = Eggen1970/> and a 1982 survey also identified suspected variations. However, it could not confirm it was a variable star..<ref name = Rufener1982/> It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the [[variable star designation]] RV Caeli.<ref name = Kazarovets1999/>

{{clear left}}
RV Caeli is an evolved [[red giant]] star with a [[stellar classification]] of M1 III.<ref name = Houk1978/> It is currently on the [[asymptotic giant branch]],<ref name = Eggen1992/> generating energy via [[hydrogen]] and [[helium]] shell fusion around an inert [[carbon]] core. It has 114% the [[mass of the Sun]]<ref name = Anders2019/> but has expanded to over 100 times its [[Solar radius|girth]].<ref name = Kervella2021/> It radiates 976 times the [[luminosity of the Sun]]<ref name = GaiaDR2/> from its [[photosphere]] at an [[effective temperature]] of {{val|3843|ul=K|fmt=commas}}.<ref name = Stassun2019/> RV Caeli is metal deficient, having an [[iron]] abundance 70% that of the [[Sun]].

==References==
==References==
{{reflist|refs=
{{reflist|refs=

<ref name = GaiaDR3>{{Cite DR3|4839874474064516608}}</ref>

<ref name = GaiaDR2>{{Cite DR3|4839874474064516608}}</ref>

<ref name = Houk1978>{{cite book |last1=Houk |first1=Nancy |title=Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41° |year=1978 |bibcode=1978mcts.book.....H }}</ref>

<ref name = VanLeeuwen2007>{{Cite New HIP red.|20856}}</ref>

<ref name = Eggen1992>{{cite journal |last1=Eggen |first1=Olin J. |title=Asymptotic giant branch stars near the sun |journal=The Astronomical Journal |date=July 1992 |volume=104 |pages=275 |doi=10.1086/116239 |issn=0004-6256 |bibcode=1992AJ....104..275E |doi-access=free}}</ref>


<ref name="Tabur">{{cite journal |last1=Tabur |first1=V. |last2=Bedding |first2=T. R. |last3=Kiss |first3=L. L. |last4=Moon |first4=T. T. |last5=Szeidl |first5=B. |last6=Kjeldsen |first6=H. |title=Long-term photometry and periods for 261 nearby pulsating M giants |journal=Monthly Notices of the Royal Astronomical Society |date=December 2009 |volume=400 |issue=4 |pages=1945–1961 |doi=10.1111/j.1365-2966.2009.15588.x |bibcode=2009MNRAS.400.1945T |s2cid=15358380 |url=https://ui.adsabs.harvard.edu/abs/2009MNRAS.400.1945T |access-date=8 November 2021}}</ref>
<ref name="Tabur">{{cite journal |last1=Tabur |first1=V. |last2=Bedding |first2=T. R. |last3=Kiss |first3=L. L. |last4=Moon |first4=T. T. |last5=Szeidl |first5=B. |last6=Kjeldsen |first6=H. |title=Long-term photometry and periods for 261 nearby pulsating M giants |journal=Monthly Notices of the Royal Astronomical Society |date=December 2009 |volume=400 |issue=4 |pages=1945–1961 |doi=10.1111/j.1365-2966.2009.15588.x |bibcode=2009MNRAS.400.1945T |s2cid=15358380 |url=https://ui.adsabs.harvard.edu/abs/2009MNRAS.400.1945T |access-date=8 November 2021}}</ref>


<ref name = Gontcharov2006>{{cite journal | last1 = Gontcharov | first1 = G. A. | title = Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system | journal = Astronomy Letters | date = November 2006 | volume = 32 | issue = 11 | pages = 759–771 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773706110065 | pmid = | bibcode = 2006AstL...32..759G | arxiv = 1606.08053 | s2cid = 119231169 }}</ref>
}}


<ref name = Stassun2019>{{cite journal | display-authors = 1 | last1 = Stassun | first1 = Keivan G. | last2 = Oelkers | first2 = Ryan J. | last3 = Paegert | first3 = Martin | last4 = Torres | first4 = Guillermo | last5 = Pepper | first5 = Joshua | last6 = Lee | first6 = Nathan De | last7 = Collins | first7 = Kevin | last8 = Latham | first8 = David W. | last9 = Muirhead | first9 = Philip S. | last10 = Chittidi | first10 = Jay | last11 = Rojas-Ayala | first11 = Bárbara | last12 = Fleming | first12 = Scott W. | last13 = Rose | first13 = Mark E. | last14 = Tenenbaum | first14 = Peter | last15 = Ting | first15 = Eric B. | last16 = Kane | first16 = Stephen R. | last17 = Barclay | first17 = Thomas | last18 = Bean | first18 = Jacob L. | last19 = Brassuer | first19 = C. E. | last20 = Charbonneau | first20 = David | last21 = Ge | first21 = Jian | last22 = Lissauer | first22 = Jack J. | last23 = Mann | first23 = Andrew W. | last24 = McLean | first24 = Brian | last25 = Mullally | first25 = Susan | last26 = Narita | first26 = Norio | last27 = Plavchan | first27 = Peter | last28 = Ricker | first28 = George R. | last29 = Sasselov | first29 = Dimitar | last30 = Seager | first30 = S. | last31 = Sharma | first31 = Sanjib | last32 = Shiao | first32 = Bernie | last33 = Sozzetti | first33 = Alessandro | last34 = Stello | first34 = Dennis | last35 = Vanderspek | first35 = Roland | last36 = Wallace | first36 = Geoff | last37 = Winn | first37 = Joshua N. | title = The Revised ''TESS'' Input Catalog and Candidate Target List | journal = The Astronomical Journal | date = 9 September 2019 | volume = 158 | issue = 4 | page = 138 | eissn = 1538-3881 | doi = 10.3847/1538-3881/ab3467 | bibcode = 2019AJ....158..138S | arxiv = 1905.10694 | doi-access = free}}</ref>

<ref name = Kervella2021>{{cite journal | last1 = Kervella | first1 = Pierre | last2 = Arenou | first2 = Frédéric | last3 = Thévenin | first3 = Frédéric | title = Stellar and substellar companions from ''Gaia'' EDR3 | journal = Astronomy & Astrophysics | year = 2022 | volume = 657 | page = A7 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/202142146 | bibcode = 2022A&A...657A...7K | arxiv = 2109.10912 | doi-access = free}}</ref>

<ref name = Anderson2012>{{cite journal | last1 = Anderson | first1 = E. | last2 = Francis | first2 = Ch. | title = XHIP: An extended hipparcos compilation | journal = Astronomy Letters | date = May 2012 | volume = 38 | issue = 5 | pages = 331–346 | issn = 1063-7737 | eissn = 1562-6873 | doi = 10.1134/S1063773712050015 | bibcode = 2012AstL...38..331A | arxiv = 1108.4971| s2cid = 119257644 }}</ref>

<ref name = Anders2019>{{cite journal | display-authors = 1 | last1 = Anders | first1 = F. | last2 = Khalatyan | first2 = A. | last3 = Chiappini | first3 = C. | last4 = Queiroz | first4 = A. B. | last5 = Santiago | first5 = B. X. | last6 = Jordi | first6 = C. | last7 = Girardi | first7 = L. | last8 = Brown | first8 = A. G. A. | last9 = Matijevič | first9 = G. | last10 = Monari | first10 = G. | last11 = Cantat-Gaudin | first11 = T. | last12 = Weiler | first12 = M. | last13 = Khan | first13 = S. | last14 = Miglio | first14 = A. | last15 = Carrillo | first15 = I. | last16 = Romero-Gómez | first16 = M. | last17 = Minchev | first17 = I. | last18 = de Jong | first18 = R. S. | last19 = Antoja | first19 = T. | last20 = Ramos | first20 = P. | last21 = Steinmetz | first21 = M. | last22 = Enke | first22 = H. | title = Photo-astrometric distances, extinctions, and astrophysical parameters for <i>Gaia</i> DR2 stars brighter than <i>G</i> = 18| journal = Astronomy &amp; Astrophysics | date = August 2019 | volume = 628 | page = A94 | issn = 0004-6361 | eissn = 1432-0746 | doi = 10.1051/0004-6361/201935765 | bibcode = 2019A&A...628A..94A | arxiv = 1904.11302 | doi-access = free}}</ref>

<ref name = Tycho2000>{{cite journal | last1 = Høg | first1 = E. | last2 = Fabricius | first2 = C. | last3 = Makarov | first3 = V. V. | last4 = Urban | first4 = S. | last5 = Corbin | first5 = T. | last6 = Wycoff | first6 = G. | last7 = Bastian | first7 = U. | last8 = Schwekendiek | first8 = P. | last9 = Wicenec | first9 = A. | title = The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics | date = March 2000 | volume = 355 | pages = L27–L30 | bibcode = 2000A&A...355L..27H | issn = 0004-6361}}</ref>

<ref name="AAVSO">{{cite web|author=VSX|date=25 August 2009|title=RV Cae|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=4525|work=International Variable Star Index|publisher=[[American Association of Variable Star Observers]]|access-date=30 June 2014}}</ref>

<ref name = Eggen1970>{{cite journal | last1 = Eggen | first1 = O. J. | last2 = Stokes | first2 = N. R. | title = Narrow-Band and Broad-Band Photometry of Red Stars. III. Southern Giants | journal = The Astrophysical Journal | date = July 1970 | volume = 161 | page = 199 | issn = 0004-637X | eissn = 1538-4357 | doi = 10.1086/150525 | bibcode = 1970ApJ...161..199E | doi-access = free}}</ref>

.<ref name = Rufener1982>{{cite journal|bibcode=1982A&AS...48..503R|title=List of 333 variable, microvariable or suspected variable stars detected in the Geneva photometry|journal=Astronomy and Astrophysics Supplement Series|volume=48|pages=503|last1=Rufener|first1=F.|last2=Bartholdi|first2=P.|date = June 1982}}</ref>

<ref name = Kazarovets1999>{{cite journal | last1 = Kazarovets | first1 = E. V. | last2 = Samus | first2 = N. N. | last3 = Durlevich | first3 = O. V. | last4 = Frolov | first4 = M. S. | last5 = Antipin | first5 = S. V. | last6 = Kireeva | first6 = N. N. | last7 = Pastukhova | first7 = E. N. | title = The 74th Special Name-list of Variable Stars |journal=Information Bulletin on Variable Stars | date = January 1999 | volume = 4659 | pages = 1 | issn = 0374-0676 | bibcode = 1999IBVS.4659....1K}}</ref>

<ref name = Johnson1966>{{cite journal | last1 = Johnson | first1 = H. L. | last2 = Mitchell | first2 = R. I. | last3 = Iriarte | first3 = B. | last4 = Wisniewski | first4 = W. Z. | title = UBVRIJKL Photometry of the Bright Stars | journal = Communications of the Lunar and Planetary Laboratory | year = 1966 | volume = 4 | pages = 99–110 | bibcode = 1966CoLPL...4...99J}}</ref>

<ref name = Gould1879>{{cite journal | last=Gould | first=Benjamin Apthorp | title=Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas | journal=Resultados del Observatorio Nacional Argentino | volume=1 | bibcode=1879RNAO....1.....G | year=1878 | page=}}</ref>

<ref name = SIMBAD>{{Cite simbad|title = HD 28552|access-date = September 28, 2022}}</ref>

}}
{{Stars of Caelum}}
{{Stars of Caelum}}


Revision as of 16:58, 28 September 2022

RV Caeli
Location of RV Caeli (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 04h 28m 09.46368s[1]
Declination −41° 51′ 35.4013″[1]
Apparent magnitude (V) 6.4±0.01[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M1 III[4]
B−V color index +1.64[5]
Variable type semiregular[6]
Astrometry
Radial velocity (Rv)97.9±0.5[7] km/s
Proper motion (μ) RA: −14.75 mas/yr[8]
Dec.: +2.87 mas/yr[8]
Parallax (π)2.4402 ± 0.0229 mas[1]
Distance1,340 ± 10 ly
(410 ± 4 pc)
Absolute magnitude (MV)−1.36[9]
Details
Mass1.14[10] M☉
Radius107[11] R☉
Luminosity976±30[12] L☉
Surface gravity (log g)0.67[10] cgs
Temperature3,843±122[13] K
Metallicity [Fe/H]−0.15[10] dex
Other designations
4 G. Caeli[14], CD−42°1510, CPD−42°469, GC 5451, HD 28552, HIP 20856, HR 1429, SAO 216821[15]
Database references
SIMBADdata

RV Caeli, also known as HD 28552, is a solitary, red hued variable star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.4,[2] placing it near the limit for naked eye visibility. The object is located relatively far at a distance of 1,340 light years based on parallax measurements from Gaia DR3,[1] but is rapidly receding with a heliocentric radial velocity of 98 km/s.[7]

A visual band light curve for RV Caeli, adapted from Tabur et al. (2009).[16]

Hipparcos has found it to vary between its photometric values of 6.44 and 6.56,[6] which roughly corresponds with the magnitude as seen with the naked eye. It was first suspected of variability in 1970,[17] and a 1982 survey also identified suspected variations. However, it could not confirm it was a variable star..[18] It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the variable star designation RV Caeli.[19]

RV Caeli is an evolved red giant star with a stellar classification of M1 III.[4] It is currently on the asymptotic giant branch,[3] generating energy via hydrogen and helium shell fusion around an inert carbon core. It has 114% the mass of the Sun[10] but has expanded to over 100 times its girth.[11] It radiates 976 times the luminosity of the Sun[12] from its photosphere at an effective temperature of 3,843 K.[13] RV Caeli is metal deficient, having an iron abundance 70% that of the Sun.

References

  1. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. ISSN 0004-6256.
  4. ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars Volume II: Declinations −52° to −41°. Bibcode:1978mcts.book.....H.
  5. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
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  14. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
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