Alpha Pyxidis

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

{{Starbox image

| image =

{{Location mark

| image=Pyxis IAU.svg

| float=center | width=250 | position=right

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

| x%=55.6 | y%=60.4

}}

| caption=Location of α Pyxidis (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|08|43|35.53756}}

| dec = {{DEC|−33|11|10.9898}}

| appmag_v = 3.67

| constell = Pyxis

}}

{{Starbox character

| class = B1.5III

| b-v = −0.19

| u-b = −0.84

| variable = Beta Cephei

}}

{{Starbox astrometry

| radial_v = +15.3

| prop_mo_ra = −14.27

| prop_mo_dec = +10.43

| parallax = 3.71

| p_error = 0.14

| parallax_footnote =

| absmag_v = −3.47

}}

{{Starbox detail

| mass = 10.7

| radius = {{nowrap|6.3 ± 1.0}}

| luminosity = 10,000

| temperature = 24,300

| metal_fe = −0.18

| rotation =

| rotational_velocity = 11

| gravity = 3.63

| age =

}}

{{Starbox catalog

| names = {{odlist | B=Alpha Pyx, α Pyx | CPD=−32°2399 | FK5=327 | HD=74575 | HIP=42828 | HR=3468 | SAO=199546 }}

}}

{{Starbox reference

|Simbad=*+alf+Pyx

}}

Alpha Pyxidis, Latinised from α Pyxidis, is a giant star in the constellation Pyxis. It is the brightest star in Pyxis, and is easily visible to the naked eye. It has a stellar classification of B1.5III and is a Beta Cephei variable. This star has more than ten times the mass of the Sun and is more than six times the Sun's radius. The surface temperature is {{val|24300|ul=K|fmt=commas}} and the star is about 10,000 times as luminous as the Sun. Stars such as this with more than 10 solar masses are expected to end their life by exploding as a supernova.

File:AlpPyxLightCurve.png for Alpha Pyxidis, plotted from ''TESS data.]]

Naming

In Chinese, {{lang|zh|天狗}} ({{lang|zh-Latn|Tiān Gǒu}}), meaning Celestial Dog, refers to an asterism consisting of α Pyxidis, e Velorum, f Velorum, β Pyxidis, γ Pyxidis and δ Pyxidis. Consequently, α Pyxidis itself is known as {{lang|zh|天狗五}} ({{lang|zh-Latn|Tiān Gǒu wǔ}}, {{langx|en|the Fifth 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 | 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 |arxiv = 0708.1752 | s2cid=18759600 }}

{{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=29 September 2024}}

{{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 | last1=Hubrig | first1=S. | last2=Ilyin | first2=I. | last3=Schöller | first3=M. | last4=Briquet | first4=M. | last5=Morel | first5=T. | last6=De Cat | first6=P. | title=First Magnetic Field Models for Recently Discovered Magnetic β Cephei and Slowly Pulsating B Stars | journal=The Astrophysical Journal Letters | volume=726 | issue=1 | page=L5 |date=January 2011 | doi=10.1088/2041-8205/726/1/L5 | bibcode=2011ApJ...726L...5H |arxiv = 1012.3019 | hdl=2268/81132 | s2cid=119195567 | url=http://orbi.ulg.ac.be/bitstream/2268/81132/1/apjl_726_1_5.pdf }}

{{cite journal | last=Fernie | first=J. D. | title=New UBVRI photometry for 900 supergiants | journal=Astrophysical Journal Supplement Series | volume=52 |date=May 1983 | pages=7–22 | doi=10.1086/190856 | bibcode=1983ApJS...52....7F | doi-access=free }}

{{cite journal | 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 }}

{{cite journal | last=Kilian | first=J. | title=Chemical abundances in early B-type stars. 5: Metal abundances and LTE/NLTE comparison | journal=Astronomy and Astrophysics | volume=282 | issue=3 | pages=867–873 |date=February 1994 | bibcode=1994A&A...282..867K }}

{{cite journal | last1=Nieva | first1=M. F. | last2=Przybilla | first2=N. | title=Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/IV and self-consistent atmospheric parameters | journal=Astronomy and Astrophysics | volume=481 | issue=1 |date=April 2008 | pages=199–216 | doi=10.1051/0004-6361:20078203 | bibcode=2008A&A...481..199N |arxiv = 0711.3783 | s2cid=10281324 }}

{{cite journal | last1=Hiltner | first1=W. A. | last2=Garrison | first2=R. F. | last3=Schild | first3=R. E. | title=MK Spectral Types for Bright Southern OB Stars | journal=Astrophysical Journal | volume=157 | page=313 |date=July 1969 | doi=10.1086/150069 | bibcode=1969ApJ...157..313H | doi-access=free }}

{{cite simbad

| title=alf Pyx | access-date=2021-07-29 | postscript=. }}

{{cite journal | display-authors=1 | last1=Hubrig | first1=S. | last2=Briquet | first2=M. | last3=De Cat | first3=P. | last4=Schoeller | first4=M. | last5=Morel | first5=T. | last6=Ilyin | first6=I. | title=New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars | journal=Astronomische Nachrichten | volume=330 | issue=4 | page=317 |date=January 2009 | doi=10.1002/asna.200811187 | bibcode=2009AN....330..317H | arxiv=0902.1314 | s2cid=17497112 }}

{{cite journal | first=B. Cameron | last=Reed | title=New Estimates of the Solar-Neighborhood Massive-Stars Birthrate and the Galactic Supernova Rate | date=June 28, 2005 | doi=10.1086/444474 | journal=The Astronomical Journal | volume=130 | issue=4 | pages=1652–1657 | arxiv=astro-ph/0506708 | bibcode = 2005AJ....130.1652R | s2cid=119515135 }}

}}

External links

{{cite web

| first=James | last=Kaler | title=Alpha Pyxidis

| publisher=University of Illinois

| url=http://stars.astro.illinois.edu/sow/alphapyx.html

| accessdate=2010-02-23 }}

Category:B-type giants

Category:Beta Cephei variables