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Gliese 867

{{Short description|Star system in the constellation Aquarius}}

{{Starbox begin}}

{{Starbox observe 2s

| epoch = J2000

| constell = Aquarius

| component1 = A

| ra1 = {{RA|22|38|45.57462}}

| dec1 = {{DEC|-20|37|16.0874}}

| appmag_v1 = 9.08

| component2 = B

| ra2 = {{RA|22|38|45.28128}}

| dec2 = {{DEC|-20|36|51.8102}}

| appmag_v2 = 11.49

}}

{{Starbox character

| component1 = A

| type = main sequence

| class = M2.0V

| variable = UV Cet+BY Dra

| component2 = B

| type2 = main sequence

| class2 = M3.5V

| variable2 = UV Cet+BY Dra

}}

{{Starbox astrometry

| component1 = A

| radial_v = {{val|-8.70|0.69}}

| prop_mo_ra = +449.207

| prop_mo_dec = −79.046

| pm_footnote =

| parallax = 112.3859

| p_error = 0.0555

| parallax_footnote =

| absmag_v = 9.39

| component2 = B

| radial_v2 = {{val|-5.95|3.96}}

| prop_mo_ra2 = +424.590

| prop_mo_dec2 = −66.983

| pm_footnote2 =

| parallax2 = 112.9867

| p_error2 = 0.0387

| parallax_footnote2 =

}}

{{Starbox orbit

| reference =

| primary = A

| name = C

| period_unitless = {{val|4.0831962|(29)|ul=d}}

| axis = {{val|0.005607|0.000036}}

| eccentricity = {{val|0.00520|0.00047}}

| inclination = {{val|51.95|0.42}}

| node = {{val|111.64|0.22}}

| periastron = {{val|2437145.575|0.037|ul=JD}}

| periarg = {{val|307.5|3.0}}

| k1 = {{val|46.138|0.011}}

| k2 = {{val|58.275|0.023}}

}}

{{Starbox orbit

| reference =

| primary = B

| name = D

| period_unitless = {{val|1.795|0.017|ul=d}}

| eccentricity = 0 (assumed)

| periastron = {{val|2456160.5611|0.0268|ul=JD}}

| k1 = {{val|21.4|0.5}}

}}

{{Starbox detail

| component1 = A

| mass = {{val|0.5503|0.0095}}

| radius = 0.56

| luminosity =

| gravity =

| temperature = 3416

| metal_fe = 0.08

| rotation = {{val|4.083|ul=d}}{{efn|name=rotation|The two stars are assumed to be in synchronous rotation, so the rotation period is the same as the orbital period.}}

| rotational_velocity = {{val|5.4|0.6}}

| age_gyr =

| component2 = C

| mass2 = {{val|0.4357|0.0075}}

| radius2 = 0.45

| rotation2 = {{val|4.083|ul=d}}{{efn|name=rotation}}

| rotational_velocity2 = {{val|4.4|0.6}}

}}

{{Starbox detail|no_heading=y

| component1 = B

| mass = {{val|0.29|0.06}}

| radius =

| luminosity =

| gravity =

| temperature =

| metal_fe =

| rotation =

| rotational_velocity =

| age_gyr =

| component2 = D

| mass2 = {{val|0.056|0.007|p=≥}}

}}

{{Starbox catalog

| names = {{odlist | BD=-21 6267 | CCDM=J22388-2037AB | GJ=867}}

| component1 = A

| names1 = {{odlist | V=FK Aqr | CPD=-21 8162 | HD=214479 | HIP=111802 | LTT=9128 | NLTT=54421 | SAO=191294}}

| component2 = B

| names2 = {{odlist | V=FL Aqr | L=717-22 | LP=876-81 | LTT=9127 | NLTT=54420}}

}}

{{Starbox reference

| Simbad = V*+FK+Aqr | sn=A

| Simbad2 = V*+FL+Aqr | sn2=B

}}

{{Starbox end}}

Gliese 867 is a quadruple star system located {{convert|29|ly|pc|lk=on|abbr=off}} away in the constellation Aquarius. It is composed of two binary sub-systems, Gliese 867 A & B, also known by their variable star designations FK Aquarii and FL Aquarii. Gliese 867 is the third-nearest quadruple system, after Gliese 570 and Mu Herculis, and the nearest such system where the primary star is a red dwarf. There are two closer quintuple systems, V1054 Ophiuchi and Xi Ursae Majoris, the former composed entirely of red dwarfs.

System

{{chart/start}}

{{chart|border=1| |, |S1| |S1=GJ 867 A (FK Aqr A) }}

{{chart|border=0|, |( |PA| |PA=Period = 4.1 d }}

{{chart|border=1|! |` |S2| |S2=GJ 867 C (FK Aqr B) }}

{{chart|border=0|( |PC| |PC=Sep = 216 au }}

{{chart|border=1|! |, |S1| |S1=GJ 867 B (FL Aqr A) }}

{{chart|border=0|` |( |PA| |PA=Period = 1.8 d }}

{{chart|border=1| |` |S2| |S2=GJ 867 D (FL Aqr B) }}

{{chart/end}}

Hierarchy of orbits in the Gliese 867 system

Gliese 867 A & B are separated by 24.5 arcseconds, corresponding to a projected distance of 216 AU. Both are spectroscopic binaries. Gliese 867 A & B are both flare stars and BY Draconis variables. They have been known to be flare stars since 1978.

=Gliese 867 A (FK Aquarii)=

File:FKAqrLightCurve.png for FK Aquarii, plotted from TESS data. The binary's orbital period is marked in red. The inset plot, adapted from Byrne et al. (1990), shows a flare.]]

Gliese 867 A, also known as FK Aquarii, is a close binary orbiting every 4.1 days. The companion star is also called Gliese 867 C. Both stars are red dwarfs around half the mass of the Sun. The system has been known to be a spectroscopic binary since 1965, at that time referred to by its Durchmusterung designation BD−21°6267A. It has also been characterized by astrometry from the Gaia space telescope.

Both stars are magnetically active, and have strong dipolar magnetic fields resembling those found in lower-mass, fully convective red dwarfs. The primary star is the most massive red dwarf known to host this type of magnetic field as of 2024.

=Gliese 867 B (FL Aquarii)=

File:FLAqrLightCurve.png

Gliese 867 B, also known as FL Aquarii, is a close binary orbiting every 1.8 days. It was found to be a spectrosopic binary in 2014. The primary star is a red dwarf, while the companion, Gliese 867 D, has a minimum mass of only {{val|61|7}} Jupiter masses, and so may be a brown dwarf.

{{clear left}}

See also

Notes

{{notelist}}

References

{{reflist|refs=

{{cite simbad |title=V* FK Aqr |access-date=10 April 2025}}

{{cite simbad |title=V* FL Aqr |access-date=10 April 2025}}

{{Cite Gaia DR3|2400808142038361088}}

{{Cite Gaia DR3|2400808245117576704}}

{{cite web |url=http://djm.cc/constellation.html |title=Finding the constellation which contains given sky coordinates |date=2 August 2008 |website=djm.cc}}

{{cite web |title=FK Aqr |url=https://vizier.cds.unistra.fr/viz-bin/VizieR-S?V*%20FK%20Aqr |work=General Catalog of Variable Stars - VizieR |access-date=10 April 2025}}

{{cite web |title=FL Aqr |url=https://vizier.cds.unistra.fr/viz-bin/VizieR-S?V*%20FL%20Aqr |work=General Catalog of Variable Stars - VizieR |access-date=10 April 2025}}

{{cite journal |last1=Herbig |first1=G. H. |last2=Moorhead |first2=J. M. |date=February 1965 |title=BD-21°6267A: a New dMe Double-Line Spectroscopic Binary. |journal=Astrophysical Journal |volume=141 |issue= |page=649 |doi=10.1086/148150 |bibcode=1965ApJ...141..649H}}

{{cite journal |last1=Byrne |first1=P. Brendan |date=April 1978 |title=Gliese 867 - a New Flare-Star System |journal=Information Bulletin on Variable Stars |volume=1407 |issue=1 |pages= |bibcode=1978IBVS.1407....1B}}

{{cite journal |last1=Koen |first1=C. |last2=Kilkenny |first2=D. |display-authors=etal |date=April 2010 |title=UBV(RI)C JHK observations of Hipparcos-selected nearby stars |journal=Monthly Notices of the Royal Astronomical Society |volume=403 |issue=4 |pages=1949–1968 |doi=10.1111/j.1365-2966.2009.16182.x |doi-access=free |bibcode=2010MNRAS.403.1949K}}

{{cite journal |last1=Houdebine |first1=E. R. |date=April 2010 |title=Observation and modelling of main-sequence star chromospheres - X. Radiative budgets on Gl 867A and AU Mic (dM1e), and a two-component model chromosphere for Gl 205 (dM1) |journal=Monthly Notices of the Royal Astronomical Society |volume=403 |issue=4 |pages=2157–2166 |doi=10.1111/j.1365-2966.2010.16267.x |doi-access=free |bibcode=2010MNRAS.403.2157H}}

{{cite journal |last1=Davison |first1=Cassy L. |last2=White |first2=R. J. |display-authors=etal |date=February 2014 |title=The Closest M-dwarf Quadruple System to the Sun |journal=The Astronomical Journal |volume=147 |issue=2 |pages=26 |doi=10.1088/0004-6256/147/2/26 |arxiv=1310.6761 |bibcode=2014AJ....147...26D}}

{{cite journal |first1=Céline |last1=Reylé |first2=Kevin |last2=Jardine |first3=Pascal |last3=Fouqué |first4=Jose A. |last4=Caballero |first5=Richard L. |last5=Smart |first6=Alessandro |last6=Sozzetti |date=30 April 2021 |title=The 10 parsec sample in the Gaia era |journal=Astronomy & Astrophysics |volume=650 |issue= |pages=A201 |doi=10.1051/0004-6361/202140985 |arxiv=2104.14972 |bibcode=2021A&A...650A.201R |s2cid=233476431}} Data available at https://gruze.org/10pc/ {{Webarchive|url=https://web.archive.org/web/20230312171927/http://gruze.org/10pc/ |date=12 March 2023 }}

{{cite conference |first1=Céline |last1=Reylé |first2=Kevin |last2=Jardine |first3=Pascal |last3=Fouqué |first4=Jose A. |last4=Caballero |first5=Richard L. |last5=Smart |first6=Alessandro |last6=Sozzetti |date=6 February 2023 |title=The 10 parsec sample in the Gaia era: First update |conference=The 21st Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |doi=10.5281/zenodo.7576096 |arxiv=2302.02810 |bibcode=2022csss.confE.218R}}

{{cite journal |last1=Tsvetkova |first1=S. |last2=Morin |first2=J. |display-authors=etal |date=February 2024 |title=The large-scale magnetic field of the M dwarf double-line spectroscopic binary FK Aqr |journal=Astronomy & Astrophysics |volume=682 |issue= |pages=A77 |doi=10.1051/0004-6361/202347604 |arxiv=2312.04247 |bibcode=2024A&A...682A..77T}}

{{cite journal |last1=Byrne |first1=P. B. |last2=Butler |first2=C. J. |last3=Lyons |first3=M. A. |title=Activity in late-type stars. VI. Optical photometry and UV spectroscopy of the active dMe star, FK Aquarii in late 1983 |journal=Astronomy and Astrophysics |bibcode=1990A&A...236..455B |date=September 1990 |volume=236 |pages=455–460 |url=https://articles.adsabs.harvard.edu/pdf/1990A%26A...236..455B |access-date=14 April 2025}}

{{cite web |title=MAST: Barbara A. Mikulski Archive for Space Telescopes |url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html |publisher=Space Telescope Science Institute |access-date=14 April 2025}}

{{cite journal |last1=Doyle |first1=J. G. |last2=Byrne |first2=P. B. |last3=Butler |first3=C. J. |title=Flare activity and BY-Draconis-type variability on the late-type dMe star Gliese 867 B |journal=Astronomy and Astrophysics |date=February 1986 |volume=156 |pages=283–288 |bibcode=1986A&A...156..283D |url=https://articles.adsabs.harvard.edu/pdf/1986A%26A...156..283D |access-date=14 April 2025}}

}}

Further reading

  • {{cite journal |last1=Byrne |first1=P. B. |date=April 1979 |title=Gliese 867 - a multiple flare star system. |journal=Monthly Notices of the Royal Astronomical Society |volume=187 |issue= 2|pages=153–159 |doi=10.1093/mnras/187.2.153 |doi-access=free |bibcode=1979MNRAS.187..153B}}
  • {{cite journal |last1=Byrne |first1=P. B. |last2=McFarland |first2=J. |date=November 1980 |title=Gliese 867 - Further observations of a multiple flare star system. |journal=Monthly Notices of the Royal Astronomical Society |volume=193 |issue= 3|pages=525–532 |doi=10.1093/mnras/193.3.525 |doi-access=free |bibcode=1980MNRAS.193..525B}}
  • {{cite journal |last1=Byrne |first1=P. B. |last2=Black |first2=E. |last3=The |last4=P. S. |date=November 1987 |title=Activity in late-type dwarfs. I. Walvaren and Johnson photometry of flares and SPOT variations on GL 867A (= FK Aqr) in 1979. |journal=Astronomy and Astrophysics |volume=186 |issue= |pages=261–267 |bibcode=1987A&A...186..261B}}
  • {{cite journal |last1=Byrne |first1=P. B. |last2=Doyle |first2=J. G. |date=November 1987 |title=Activity in late-type dwarfs. II. Flares and SPOT variations on GL 867A (=FK Aqr) in 1981. |journal=Astronomy and Astrophysics |volume=186 |issue= |pages=268–270 |bibcode=1987A&A...186..268B}}
  • {{cite journal |last1=Agrawal |first1=P. C. |date=October 1988 |title=X-ray emission from the flare star binary Gliese 867A. |journal=Astronomy and Astrophysics |volume=204 |issue= |pages=235–238 |bibcode=1988A&A...204..235A}}
  • {{cite journal |last1=Pollock |first1=A. M. T. |last2=Tagliaferri |first2=G. |last3=Pallavicini |first3=R. |date=January 1991 |title=Quiscent and flaring X-rays from both Gliese 867A and Gliese 867B. |journal=Astronomy and Astrophysics |volume=241 |issue= |pages=451–456 |bibcode=1991A&A...241..451P}}

{{Aquarius (constellation)}}

Category:Aquarius (constellation)

4

Category:M-type main-sequence stars

Category:Brown dwarfs

Category:Spectroscopic binaries

BD-21 6267

0867

214479

111802

Aquarii, FK