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Nu2 Sagittarii

{{short description|Star in the constellation Sagittarius}}

{{DISPLAYTITLE:Nu2 Sagittarii}}

{{other stars by Bayer designation|Nu Sagittarii{{!}}ν Sagittarii}}

{{Starbox begin

| name = Nu2 Sagittarii

}}

{{Starbox image

| image =

File:Sagittarius IAU.svg

| caption = Location of ν2 Sagittarii (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Sagittarius

| ra = {{RA|18|55|07.14098}}

| dec = {{DEC|−22|40|16.8185}}

| appmag_v = +4.98

}}

{{Starbox character

| class = K1 Ib–II

| b-v = +1.32

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = −109.6

| prop_mo_ra = −109.04

| prop_mo_dec = −35.25

| parallax = 11.91

| p_error =0.52

| parallax_footnote =

| absmag_v = +0.38

}}

{{Starbox detail

| source =

| component1 = ν2 Sgr A

| mass = 1.44

| radius = 85

| luminosity = 120

| temperature = {{Val|4244|57|fmt=commas}}

| gravity = 1.03

| metal_fe = −0.13

| rotational_velocity =

| age_gyr = 4.52

}}

{{Starbox catalog

| names = {{odlist | B=ν2 Sgr | F=35 Sgr | BD=−22° 4915 | FK5= | HD=175190 | HIP=92845 | HR=7120 | SAO=187445 }}

}}

{{Starbox reference

| Simbad = nu.02+Sgr

}}

{{Starbox end}}

Nu2 Sagittarii (ν2 Sagittarii) is a binary star system in the zodiac constellation of Sagittarius. It is faintly visible to the naked eye, having an apparent visual magnitude of +4.98; it is 0.16 degree north of the ecliptic. The annual parallax shift of 11.91 mas as seen from Earth, indicates this system is roughly 270 light years from the Sun. Nu2 Sagittarii has a high peculiar velocity of {{Val|86.0|11.6|14.4|u=km/s}} and is most likely a runaway star system.

The spectrum of the primary component displays a stellar classification of K1 Ib–II, indicating this is a K-type star with a mixed luminosity class of an evolved bright giant/supergiant star. It is a mild barium star, showing an enhanced abundance of s-process elements in its outer atmosphere. This material was most likely acquired during a previous mass transfer from its now white dwarf companion. The primary has an estimated 1.4 times the mass of the Sun and has expanded to 85 times the Sun's radius.

References

{{reflist|refs=

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | pages=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{citation | display-authors=1

| last1=Pasinetti Fracassini | first1=L. E. | last2=Pastori | first2=L.

| last3=Covino | first3=S. | last4=Pozzi | first4=A.

| title=Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)

| journal=Astronomy & Astrophysics

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| bibcode=2001A&A...367..521P | doi=10.1051/0004-6361:20000451

| arxiv=astro-ph/0012289 | s2cid=425754 | postscript=. }}

{{citation

| display-authors=1 | last1=Gomez | first1=A. E.

| last2=Luri | first2=X. | last3=Grenier | first3=S.

| last4=Prevot | first4=L. | last5=Mennessier | first5=M. O.

| last6=Figueras | first6=F. | last7=Torra | first7=J.

| title=Absolute magnitudes and kinematics of barium stars

| journal=Astronomy and Astrophysics

| volume=319 | pages=881 | year=1997

| bibcode=1997A&A...319..881G | postscript=. }}

{{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

| bibcode=2008MNRAS.389..869E | doi=10.1111/j.1365-2966.2008.13596.x

| doi-access=free | arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

{{citation | display-authors=1

| last1=Soubiran | first1=C. | last2=Le Campion | first2=J.-F.

| last3=Cayrel de Strobel | first3=G. | last4=Caillo | first4=A.

| title=The PASTEL catalogue of stellar parameters

| journal=Astronomy and Astrophysics

| volume=515 | page=A111 | date=June 2010

| doi=10.1051/0004-6361/201014247 | bibcode=2010A&A...515A.111S

| postscript=. | arxiv=1004.1069 | s2cid=118362423 }}

{{citation

| display-authors=1 | last1=Tetzlaff | first1=N.

| last2=Neuhäuser | first2=R. | last3=Hohle | first3=M. M.

| title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun

| journal=Monthly Notices of the Royal Astronomical Society

| volume=410 | issue=1 | pages=190–200 | date=January 2011

| doi=10.1111/j.1365-2966.2010.17434.x | doi-access=free | bibcode=2011MNRAS.410..190T

| arxiv=1007.4883 | s2cid=118629873 | postscript=. }}

{{citation

| title=Abundances in the Local Region. I. G and K Giants

| last1=Luck | first1=R. Earle

| journal=Astronomical Journal | postscript=.

| volume=150 | issue=3 | at=88 | year=2015

| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 |arxiv = 1507.01466 | s2cid=118505114 }}

{{cite simbad

| title=nu02 Sgr | access-date=2017-07-06 }}

}}

{{Stars of Sagittarius|state=collapsed}}

{{DEFAULTSORT:Nu2 Sagittarii}}

Category:K-type bright giants

Category:K-type supergiants

Category:Barium stars

Category:Runaway stars

Sagittarii, Nu

Category:Sagittarius (constellation)

Category:Durchmusterung objects

Sagittarii, 35

175190

092845

7120