Gamma Pyxidis

{{Short description|K-type giant star in the constellation Pyxis}}

{{Starbox begin

| name=γ Pyxidis

}}

{{Starbox image

| image=

{{Location mark

|image=Pyxis constellation map.svg|alt=|float=center|width=220

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=γ Pyx

|x=553|y=464

}}

|caption=Location of γ Pyxidis (circled)

}}

{{Starbox observe

| epoch=J2000

| ra={{RA|08|50|31.92282}}

| dec={{DEC|−27|42|35.4421}}

| appmag_v=4.010

| constell=Pyxis

}}

{{Starbox character

| type = red clump

| class=K3 III

| b-v=+1.284

| u-b=+1.368

| variable=

}}

{{Starbox astrometry

| radial_v={{Val|+24.5|0.7}}

| prop_mo_ra=−134.31

| prop_mo_dec=87.89

| parallax=15.73

| p_error=0.17

| parallax_footnote={{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |s2cid = 18759600}}

| absmag_v= +0.00{{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=. }}

}}

{{Starbox detail

| mass=1.64

| radius=21.87

| luminosity=178

| temperature=4,270

| metal_fe=−0.05

| rotational_velocity=

| gravity=2.35

| age_gyr={{Val|4.29|2.49}}

}}

{{Starbox catalog

| names={{odlist | B=γ Pyx | CPD=−27°3442 | FK5=332 | HD=75691 | HIP=43409 | HR=3518 | SAO=176559 | GC=12216 }}

}}

Gamma Pyxidis, Latinized from γ Pyxidis, is a single, orange-hued star in the southern constellation Pyxis. It is visible to the naked eye, having an apparent visual magnitude of 4.010. Based upon an annual parallax shift of 15.73 mas as seen from Earth, it is located about 207 light years from the Sun. The star is moving further from the Sun with a radial velocity of +24.5 km/s.

Properties

This is an evolved K-type giant star with a stellar classification of K3 III. It is a red clump star on the horizontal branch, indicating that it is generating energy through helium fusion at its core. The composition of the stellar atmosphere is similar to the Sun, having roughly the same abundance of iron in its spectrum. The star has an estimated 1.64 times the mass of the Sun and has expanded to nearly 22 times the Sun's radius. At the age of around four billion years, it is radiating 178 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,270 K.

Gamma Pyxidis is moving through the Galaxy at a speed of 54.2 km/s relative to the Sun. Its projected Galactic orbit carries it between 21,300 and 30,700 light years from the center of the Galaxy.{{Cite web |url=http://www.astrostudio.org/xhip.php?hip=43409 |title=Gamma Pyxidis (HIP 43409) |access-date=2012-08-23 |archive-url=https://web.archive.org/web/20140221164512/http://www.astrostudio.org/xhip.php?hip=43409 |archive-date=2014-02-21 |url-status=dead }}{{Better source|date=July 2017}}

Naming

In Chinese, {{lang|zh|天狗}} ({{lang|zh-Latn|Tiān Gǒu}}), meaning Celestial Dog, refers to an asterism consisting of γ Pyxidis, e Velorum, f Velorum, β Pyxidis, α Pyxidis and δ Pyxidis. Consequently, γ Pyxidis itself is known as {{lang|zh|天狗六}} ({{lang|zh-Latn|Tiān Gǒu liù}}, {{langx|en|the Sixth Star of Celestial Dog}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060717.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 17 日] {{Webarchive|url=https://web.archive.org/web/20120204114243/http://aeea.nmns.edu.tw/2006/0607/ap060717.html |date=2012-02-04 }}

References

{{reflist|30em|refs=

{{citation

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

| last1=Luck | first1=R. Earle

| journal=Astronomical Journal

| 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 | postscript=. }}

{{citation

| title=K-Band Calibration of the Red Clump Luminosity

| last1=Alves | first1=David R. | postscript=.

| journal=The Astrophysical Journal

| volume=539 | issue=2 | pages=732–741 | date=August 2000

| doi=10.1086/309278 | bibcode=2000ApJ...539..732A | arxiv=astro-ph/0003329| s2cid=16673121 }}

{{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

| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}

{{citation

| display-authors=1 | last1=Reffert | first1=Sabine

| last2=Bergmann | first2=Christoph | last3=Quirrenbach | first3=Andreas

| last4=Trifonov | first4=Trifon | last5=Künstler | first5=Andreas

| title=Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity

| journal=Astronomy & Astrophysics | arxiv=1412.4634

| volume=574 | pages=A116 | year=2015 | postscript=.

| doi=10.1051/0004-6361/201322360 | bibcode=2015A&A...574A.116R | hdl=10722/215277| s2cid=59334290 }}

{{citation

| last1=Gontcharov | first1=G. A.

| title=Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system

| journal=Astronomy Letters | postscript=.

| volume=32| issue=11| pages=759–771| date=November 2006

| doi = 10.1134/S1063773706110065| bibcode=2006AstL...32..759G |arxiv = 1606.08053 | s2cid=119231169

}}

{{citation | title=gam Pyx | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Gamma+Pyxidis | accessdate=2009-06-03 }}

{{citation | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=Hugo | title=A photometric investigation of the Scorpio-Centaurus association | journal=Astrophysical Journal Supplement | volume=15 | page=459 |date=June 1968 | bibcode=1968ApJS...15..459G | doi=10.1086/190168 | doi-access=free }}

{{citation | author=Cenarro, A. J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=Monthly Notices of the Royal Astronomical Society | volume=374 | issue=2 | pages=664–690 | doi=10.1111/j.1365-2966.2006.11196.x | date=2007 | doi-access=free | bibcode=2007MNRAS.374..664C|arxiv = astro-ph/0611618 | s2cid=119428437 |display-authors=etal}}

{{citation | last1=Mallik | first1=Sushma V. | title=Lithium abundance and mass | journal=Astronomy and Astrophysics | volume=352 | pages=495–507 |date=December 1999 | bibcode=1999A&A...352..495M }}

{{citation | last1=Keenan | first1=Philip C. | last2=Barnbaum | first2=Cecilia | title=Revision and Calibration of MK Luminosity Classes for Cool Giants by HIPPARCOS Parallaxes | journal=The Astrophysical Journal | issue=2 | pages=859–865 |date=June 1999 | doi=10.1086/307311 | volume=518 | bibcode=1999ApJ...518..859K| s2cid=121902473 | doi-access=free }}

}}

Category:K-type giants

Category:Horizontal-branch stars

Pyxidis, Gamma

Category:Pyxis

Category:Durchmusterung objects

075691

043409

3518