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89 Aquarii

{{short description|Binary star in the constellation Aquarius}}

{{about|c3 Aquarii|other star systems with this Bayer designation|c Aquarii}}

{{Starbox begin

| name = 89 Aquarii

}}

{{Starbox image

| image =

File:Aquarius IAU.svg

| caption = Location of 89 Aquarii (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|23|09|54.89736}}

| dec = {{DEC|−22|27|27.4192}}

| appmag_v = +4.69

| constell = Aquarius

}}

{{Starbox character

| class = {{nowrap|G3 II + A2 V}}

| b-v = +0.65

| u-b = +0.39

| variable =

}}

{{Starbox astrometry

| radial_v = −4.8

| prop_mo_ra = +32.61

| prop_mo_dec = −9.76

| parallax = 6.47

| p_error = 0.68

| parallax_footnote =

| absmag_v = 0.1/1.5

}}

{{Starbox detail

| component1 = 89 Aqr A

| mass = 2.9

| radius =

| luminosity =

| temperature = 5,640

| metal_fe = +0.27

| gravity = 3.62

| rotational_velocity =

| age_myr = 320

| component2 = 89 Aqr B

| mass2 = 2.0

| temperature2= 8,912

}}

{{Starbox catalog

| names = CD−23 17771, HIP 114375, HR 8817, SAO 191687.

| component1 = 89 Aqr A

| names1 = HD 218640.

| component2 = 89 Aqr B

| names2 = HD 218641.

}}{{starbox reference|Simbad=89+Aqr}}{{Starbox end}}

89 Aquarii (abbreviated 89 Aqr) is a binary star system in the equatorial constellation of Aquarius. 89 Aquarii is the Flamsteed designation, though it also bears the Bayer designation c3 Aquarii.[http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=IV/27A/catalog&recno=3915] database record, HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index, N. D. Kostjuk, Institute of Astronomy of Russian Academy of Sciences, 2002; CDS ID IV/27A. The apparent visual magnitude of +4.69 is bright enough to be seen with the naked eye. Its distance from Earth is roughly {{Convert|500|ly|pc}}, based upon parallax measurements with an 11% margin of error.

The primary component of this system has a magnitude of 5.27 and a stellar classification of G3 II, which suggests this is an evolved star in the bright giant stage. The companion is an A-type main sequence star with a stellar classification of A2 V. As of 2010, it is located at an angular separation of 0.1843 arcseconds along a position angle of 135.1°. They orbit each other with an estimated period of 201 years and a semimajor axis of 0.45 arcseconds.

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 | postscript=. |arxiv = 0708.1752 | s2cid=18759600 }}

{{citation | last=McWilliam | first=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. | doi-access=free }}

{{citation | last=Wilson | first=R. E. | year=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 | postscript=. }}

{{citation | last1=Nicolet | first1=B. | year=1978 | title=Photoelectric photometric Catalogue of homogeneous measurements in the UBV System | journal=Astronomy and Astrophysics Supplement Series | volume=34 | pages=1–49 | bibcode=1978A&AS...34....1N | postscript=. }}

{{cite simbad | title=* 89 Aqr | access-date=2012-07-13 }}

{{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | title=A catalogue of multiplicity among bright stellar systems | journal=Monthly Notices of the Royal Astronomical Society | volume=389 | issue=2 | pages=869–879 |date=September 2008 | doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E | postscript=. |arxiv = 0806.2878 | s2cid=14878976 }}

{{citation | display-authors=1 | last1=Tokovinin | first1=A. | last2=Cantarutti | first2=R. | last3=Tighe | first3=R. | last4=Schurter | first4=P. | last5=van der Bliek | first5=N. | last6=Martinez | first6=M. | last7=Mondaca | first7=E. | title=High-Resolution Imaging at the SOAR Telescope | journal=Publications of the Astronomical Society of the Pacific | volume=122 | issue=898 | pages=1483–1494 |date=December 2010 | doi=10.1086/657903 | bibcode=2010PASP..122.1483T | postscript=. |arxiv = 1010.4176 | s2cid=26826524 }}

{{citation | last1=Parsons | first1=Sidney B. | title=New and Confirmed Triple Systems with Luminous Cool Primaries and Hot Companions | journal=The Astronomical Journal | volume=127 | issue=5 | pages=2915–2930 |date=May 2004 | doi=10.1086/383546 | bibcode=2004AJ....127.2915P | postscript=. | doi-access=free }}

}}

External links

  • [http://aladin.u-strasbg.fr/AladinPreview?-c=23+09+54.8996-22+27+27.401&ident=CCDM+J23099-2227AB&submit=Aladin+previewer Image 89 Aquarii]

{{Stars of Aquarius}}

{{DEFAULTSORT:89 Aquarii}}

Category:Aquarius (constellation)

Aquarii, c3

Aquarii, 089

218640

114375

Category:G-type bright giants

Category:A-type main-sequence stars

Category:Bright Star Catalogue objects

CD-23 17771

Category:Binary stars