Beta Caeli

{{Starbox begin

| name = Beta Caeli

}}

{{Starbox image

| image =

{{Location mark

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

|label=|position=right

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

|x=540|y=410

}}

| caption = Location of β Caeli (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Caelum

| ra = {{RA|04|42|03.482}}

| dec = {{DEC|−37|08|39.59}}

| appmag_v = 5.04

}}

{{Starbox character

| class = F3 V or F3 IV

| b-v = +0.38

| u-b = +0.01

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|27.47|0.24}}

| prop_mo_ra = +42.561

| prop_mo_dec = +212.705

| pm_footnote =

| parallax = 34.6088

| p_error = 0.0531

| parallax_footnote =

| absmag_v = +2.64

}}

{{Starbox orbit

| reference =

| primary = A

| name = B

| period = 7.5

| axis_unitless = 4.6 AU

| eccentricity = 0.6

| inclination = 27 or 153

| periarg = 38

| node = 151

}}

{{Starbox detail

| component1 = β Cae A

| mass = {{val|1.482|0.040}}

| radius = {{val|1.902|0.001|0.004}}

| luminosity = {{val|6.615|0.020|0.019}}

| temperature = {{val|6665.7|1.6|1.4|fmt=commas}}

| gravity = {{Val|3.981|0.003|0.002}}

| rotation = {{Val|0.8669|0.0013}} days

| metal = {{M/H|−0.12}}

| rotational_velocity = {{Val|97.5|4.9}}

| age_gyr = 0.2 or 1.17 Gyr
{{val|1.941|0.307}}

| component2 = β Cae B

| mass2 = 0.08 or 0.2

| temperature2 = {{val|3593|160|fmt=commas}}

}}

{{Starbox catalog

| names = {{odlist | B=β Cae | CD=−37°1867 | FK5=1130 | GJ=176.1 | GJ2=9165 | HD=29992 | HIP=21861 | HR=1503 | SAO=195239 }}

}}

{{Starbox reference

| Simbad = bet+Cae

}}

Beta Caeli is a star with an orbiting companion in the southern constellation of Caelum. Its name is a Bayer designation that is Latinized from β Caeli, and abbreviated Beta Cae or β Cae. This star is dimly visible to the naked eye, having an apparent visual magnitude of 5.04. Based upon an annual parallax shift of {{val|34.6|ul=mas}} as seen from Earth, it is located at a distance of {{convert|94|ly|pc|abbr=out|lk=on}}. The star is moving away from the Sun with a radial velocity of +27.5 km/s.

Characteristics

Beta Caeli is a probable single-lined spectroscopic binary system, meaning only the spectral lines of the visible component can be seen. This primary component has a stellar classification of F3 V or F3 IV, indicating it is either an F-type main-sequence star or a somewhat more evolved subgiant star, respectively. It has an estimated 1.5 times the mass of the Sun and about 1.9 times the Sun's radius. The star is 200 million to two billion years old and has a high rate of spin with a projected rotational velocity of around 97.5 km/s. It is radiating 6.6 times the luminosity of the Sun from its photosphere at an effective temperature of 6,666 K. Based on the amount of iron detected, the abundance of elements with mass greater than helium is lower than in the Sun.

The low-mass companion is orbiting about {{val|5|ul=AU}} from the primary, with an orbital period of around seven years. Its exact mass is uncertain; an orbital solution suggest it is close to the brown dwarf regime at around {{solar mass|0.08|link=y}}, but models of stellar atmospheres suggest a higher mass of {{solar mass|0.2}}. It was first detected in 2017 and was believed to be either a brown dwarf or a star with minimum mass around {{val|40|u=Jupiter masses}}. In 2022, Beta Caeli was imaged with the Gemini Planet Imager, with a point source that very likely is {{nowrap|β Caeli B}} being detected. This object may be the source of the X-ray emission coming from the same location, which suggests the companion could be a late-type star.

The existence of additional companions beyond 55 astronomical units is ruled out.

References

{{reflist|refs=

{{Citation

| title=High-contrast imaging of HD 29992 and HD 196385 with the Gemini Planet Imager

| last=García |first=Luciano H. |last2=Petrucci |first2=R.

| last3=Jofré |first3=E. |last4=Gómez |first4=M.

| journal=Monthly Notices of the Royal Astronomical Society

| doi=10.1093/mnras/stac1929 | doi-access=free

| arxiv=2207.07435 | issn=0035-8711

| postscript=. | display-authors=1 }}

{{citation | postscript=.

| last1=Ammler-von Eiff | first1=Matthias | last2=Reiners | first2=Ansgar

| title=New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?

| journal=Astronomy & Astrophysics

| volume=542 | page=A116 | date=June 2012

| doi=10.1051/0004-6361/201118724 | arxiv=1204.2459

| bibcode=2012A&A...542A.116A | s2cid=53666672 }}

{{citation

| title=Extrasolar planets and brown dwarfs around AF-type stars. IX. The HARPS southern sample

| last1=Borgniet | first1=Simon | last2=Lagrange | first2=Anne-Marie

| last3=Meunier | first3=Nadège | last4=Galland | first4=Franck

| display-authors=1 | journal=Astronomy & Astrophysics

| volume=599 | page=A57 | year=2017

| doi=10.1051/0004-6361/201628805 | bibcode=2017A&A...599A..57B

| arxiv=1608.08257 | s2cid=118723455 | postscript=. }}

{{citation | display-authors=1

| last1=Gray | first1=R. O. | last2=Corbally | first2=C. J.

| last3=Garrison | first3=R. F. | last4=McFadden | first4=M. T.

| last5=Bubar | first5=E. J. | last6=McGahee | first6=C. E.

| last7=O'Donoghue | first7=A. A. | last8=Knox | first8=E. R.

| title=Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample

| journal=The Astronomical Journal

| volume=132 | issue=1 | pages=161–170 | date=July 2006

| doi=10.1086/504637 | bibcode=2006AJ....132..161G

| arxiv=astro-ph/0603770 | s2cid=119476992 | postscript=. }}

{{citation | display-authors=1

| last1=Torres | first1=C. A. O. | last2=Quast | first2=G. R.

| last3=Da Silva | first3=L. | last4=De La Reza | first4=R.

| last5=Melo | first5=C. H. F. | last6=Sterzik | first6=M.

| title=Search for associations containing young stars (SACY). I. Sample and searching method

| journal=Astronomy and Astrophysics

| volume=460 | issue=3 | date=December 2006 | pages=695–708

| doi=10.1051/0004-6361:20065602 | arxiv=astro-ph/0609258

| bibcode=2006A&A...460..695T | s2cid=16080025 | postscript=. }}

{{citation

| last=Cousins | first=A. W. J. | year=1973

| title=UBV photometry of some southern stars

| journal=Monthly Notes of the Astronomical Society of Southern Africa

| volume=32 | page=11 | postscript=.

| bibcode=1973MNSSA..32...11C }}

{{cite simbad

| title=bet Cae | accessdate=2017-09-09 | postscript=. }}

}}

External links

[http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%201503 HR 1503]
[http://aladin.u-strasbg.fr/AladinPreview?-c=04+42+03.4806-37+08+39.468&ident=*+bet+Cae&submit=Aladin+previewer Image Beta Caeli]

Category:F-type main-sequence stars

Category:F-type subgiants

Category:Red dwarfs

Category:Brown dwarfs

Category:Spectroscopic binaries

Category:Astronomical X-ray sources

Category:Caelum

Caeli, Beta

1503

Category:Durchmusterung objects

9165

029992

021861

Beta Caeli

Characteristics

See also

References

External links