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词条 Sigma Andromedae
释义

  1. Naming

  2. References

{{Starbox begin
| name=Sigma Andromedae
}}{{Starbox image
| image =

| caption=Location of σ Andromedae (circled)
}}{{Starbox observe
| epoch = J2000.0
| ra = {{RA|00|18|19.65745}}
| dec = {{DEC|+36|47|06.8107}}
| appmag_v = +4.51[3]
| constell = Andromeda
}}{{Starbox character
| class = A2 V[4]
| b-v = +0.05[5]
| u-b = +0.07[5]
| variable =
}}{{Starbox astrometry
| radial_v = –8.0[3]
| prop_mo_ra = –65.67
| prop_mo_dec = -42.00
| parallax = 24.20
| p_error = 0.21
| parallax_footnote=
| absmag_v = 1.33[11]
}}{{Starbox detail
| component1 =
| mass =
| radius = 2.1[12]
| luminosity = 26[13]
| temperature = 8,929[11]
| metal_fe =
| gravity = 4.02[11]
| age_myr = 450[16]
| rotational_velocity = 123[17]
}}{{Starbox catalog
| names=25 Andromeda, BD+35°44, FK5 1005, HD 1404, HIP 1473, HR 68, SAO 53798.[18]
}}{{Starbox reference
| Simbad=sig+And
}}{{Starbox end}}Sigma Andromedae (σ And, σ Andromedae) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +4.5,[3] which is bright enough to be seen with the naked eye from most locations. Parallax measurements made during the Hipparcos mission place it at a distance of about {{Convert|135|ly|pc|abbr=off|lk=on}}. The magnitude of the star is diminished by 0.08 from extinction caused by intervening gas and dust.[13]

This star has a stellar classification of A2 V,[4] which matches the spectrum of an A-type main sequence star. It is about 450 million years old[16] and is spinning rapidly with a projected rotational velocity of 123 km/s.[17] The interferometry-measured angular diameter of this star is 0.465 mas,[13] which, at its estimated distance, equates to a physical radius of about 2.1 times the radius of the Sun.[12] It is radiating 26[13] times the luminosity of the Sun from its outer atmosphere at a temperature of 8,929 K,[11] giving it the white-hued glow of an A-type star.[29]

In the past, radial velocity variations have been reported, but this remains unconfirmed.{{citation needed|date=September 2018}} The star does not show any significant photometric variations and is used as a ubvy standard star.[30] A debris disk of warm dust around this star has been detected by Spitzer Space Telescope.[31]

Sigma Andromedae is a candidate for membership in the stream of stars associated with the Ursa Major Moving Group. This is a set of stars that share a common motion through space, which suggests they originated together.[11]

Naming

In Chinese, {{lang|zh|天廄}} ({{lang|zh-Latn|Tiān Jiù}}), meaning Celestial Stable, refers to an asterism consisting of σ Andromedae, θ Andromedae and ρ Andromedae. Consequently, σ Andromedae itself is known as {{lang|zh|天廄三}} ({{lang|zh-Latn|Tiān Jiù sān}}, {{lang-en|the Third Star of Celestial Stable}}.)[1]

References

1. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 18 日
2. ^1 2 {{citation | display-authors=1 | last1=Cowley | first1=A. | last2=Cowley | first2=C. | last3=Jaschek | first3=M. | last4=Jaschek | first4=C. | title=A study of the bright A stars. I. A catalogue of spectral classifications | journal=Astronomical Journal | volume=74 | pages=375–406 |date=April 1969 | doi=10.1086/110819 | bibcode=1969AJ.....74..375C | postscript=. }}
3. ^1 2 3 {{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | date=1999 | bibcode=1999VeARI..35....1W | postscript=. }}
4. ^1 2 {{citation | last1=Royer | first1=F. | last2=Zorec | first2=J. | last3=Gómez | first3=A. E. | title=Rotational velocities of A-type stars. III. Velocity distributions | journal=Astronomy and Astrophysics | volume=463 | issue=2 | pages=671–682 |date=February 2007 | doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R | arxiv=astro-ph/0610785 | postscript=. }}
5. ^1 2 {{citation | display-authors=1 | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | date=1966 | bibcode=1966CoLPL...4...99J | postscript=. }}
6. ^1 2 {{citation | last1=Vican | first1=Laura | title=Age Determination for 346 Nearby Stars in the Herschel DEBRIS Survey | journal=The Astronomical Journal | volume=143 | issue=6 | page=135 |date=June 2012 | doi=10.1088/0004-6256/143/6/135 | bibcode=2012AJ....143..135V | postscript=. |arxiv = 1203.1966 }}
7. ^1 2 3 4 {{citation | display-authors=1 | last1=van Belle | first1=G. T. | last2=van Belle | first2=G. | last3=Creech-Eakman | first3=M. J. | last4=Coyne | first4=J. | last5=Boden | first5=A. F. | last6=Akeson | first6=R. L. | last7=Ciardi | first7=D. R. | last8=Rykoski | first8=K. M. | last9=Thompson | first9=R. R. | title=The Palomar Testbed Interferometer Calibrator Catalog | journal=The Astrophysical Journal Supplement Series | volume=176 | issue=1 | pages=276–292 |date=May 2008 | doi=10.1086/526548 | bibcode=2008ApJS..176..276V | postscript=. |arxiv = 0711.4194 }}
8. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R*) is given by::
9. ^1 2 3 4 5 {{citation | display-authors=1 | last1=King | first1=Jeremy R. | last2=Villarreal | first2=Adam R. | last3=Soderblom | first3=David R. | last4=Gulliver | first4=Austin F. | last5=Adelman | first5=Saul J. | title=Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group | journal=The Astronomical Journal | volume=125 | issue=4 | pages=1980–2017 |date=April 2003 | doi=10.1086/368241 | bibcode=2003AJ....125.1980K | postscript=. }}
10. ^1 {{cite simbad | title=sig And | accessdate=2012-06-24 | postscript=. }}
11. ^1 {{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-06-24 | postscript=. }}
12. ^1 {{citation | display-authors=1 | last1=Lehmann | first1=H. | last2=Scholz | first2=G. | last3=Hildebrandt | first3=G. | last4=Klose | first4=S. | last5=Panov | first5=K. P. | last6=Reimann | first6=H.-G. | last7=Woche | first7=M. | last8=Ziener | first8=R. | title=Variability investigations of possible Maia stars | journal=Astronomy and Astrophysics | volume=300 | page=783 |date=August 1995 | bibcode=1995A&A...300..783L }}
13. ^1 {{citation| display-authors=1 | last1=Morales | first1=F.Y. | last2= Werner | first2=M.W. | last3=Bryden | first3=G. | last4=Plavchan | first4=P. | last5=Stapelfeldt | first5=K.R. | last6=Rieke | first6=G.H. | last7=Su | first7=K.Y.L. | last8=Beichman | first8=C.A. | title=Spitzer Mid-IR Spectra of Dust Debris Around A and Late B Type Stars: Asteroid Belt Analogs and Power-Law Dust Distributions | journal=The Astrophysical Journal | volume=699 | issue=2 | page=1067-1086 |date=July 2009 | bibcode=2009ApJ...699.1067M | doi=10.1088/0004-637X/699/2/1067}}
[2][3][4][5][6][7][8][9][10][11][12][13]
}}{{Stars of Andromeda}}

9 : A-type main-sequence stars|Ursa Major Moving Group|Bayer objects|Andromeda (constellation)|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects
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