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Phi Andromedae

{{Short description|Binary star in the constellation Andromeda}}

{{Starbox begin

| name=Phi Andromedae

}}

{{Starbox image

| image=

{{Location mark

| image=Andromeda IAU.svg

| float=center | width=240 | position=right

| mark=Red circle.svg | mark_width=10 | mark_link=ι Exa

| x%=42.1 | y%=32.5

}}

| caption=Location of φ Andromedae (upper left).

}}

{{Starbox observe

| epoch = J2000

| constell = Andromeda

| ra = {{RA|01|09|30.12562}}

| dec = {{DEC|+47|14|30.4594}}

| appmag_v = 4.25 (4.46/6.06)

}}

{{Starbox character

| class = B7 Ve + B9 V

| r-i = –0.05

| v-r =

| b-v = –0.07

| u-b = –0.34

| variable =

}}

{{Starbox astrometry

| radial_v = –0.1

| prop_mo_ra = +4.05

| prop_mo_dec = –12.43

| parallax = 4.55

| p_error = 0.60

| parallax_footnote =

| absmag_v = −2.41

}}

{{Starbox visbin

| name = φ And B

| reference =

| period = {{nowrap|554.3 ± 67.1}}y

| axis = {{nowrap|0.573 ± 0.051}}

| eccentricity= {{nowrap|0.385 ± 0.043}}

| inclination = {{nowrap|142.2 ± 2.8}}

| node = {{nowrap|337.2 ± 3.2}}

| periarg = {{nowrap|112.6 ± 9.1}}

| periastron = {{nowrap|17,740 ± 1,837 HMJD}}

}}

{{Starbox detail

| component1 = φ And A

| mass =

| radius =

| luminosity = 882

| temperature = 13490

| metal_fe =

| gravity = 3.150

| rotational_velocity = 75

| age_myr = {{nowrap|63.1 ± 13.7}}

}}

{{Starbox catalog

| names=42 Andromedae, ADS 940, BD+46 275, HD 6811, HIP 5434, HR 335, SAO 36972, PPM 43693

}}

{{Starbox reference

| Simbad=*+phi+And

}}

{{Starbox end}}

Image:Phi Andromedae.jpg

Phi Andromedae (φ Andromedae, φ And) is the Bayer designation for a binary star system near the border of the northern constellation of Andromeda. This system has a combined apparent visual magnitude of 4.25 and is visible to the naked eye. Based upon parallax measurements made during the Hipparcos mission, this star system is located at a distance of about {{Convert|720|ly|pc|abbr=off|lk=on}} from Earth. With χ And it forms the Chinese asterism 軍南門 (Keun Nan Mun, Mandarin jūnnánmén), "the South Gate of the Camp".In Chinese literature, φ Andromedae is stand alone in the asterism and χ Andromeda is member of Tien Ta Tseang (Heaven's Great General) asterism, see {{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060709.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 9 日] {{Webarchive|url=https://web.archive.org/web/20110522000830/http://aeea.nmns.edu.tw/2006/0607/ap060709.html |date=2011-05-22 }} and {{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060710.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日] {{Webarchive|url=https://web.archive.org/web/20110716123113/http://aeea.nmns.edu.tw/2006/0607/ap060710.html |date=2011-07-16 }}

Components

The 4.46 magnitude primary component is a Be star with a stellar classification of B7 Ve, indicating that it is a B-type main sequence star that shows prominent emission lines of hydrogen in its spectrum. These emission lines come from a flattened decretion disk of hot gas that is orbiting the host star. The star is rotating rapidly with a projected rotational velocity of 75 km/s. The pole of the star is inclined around 20° to the line of sight from the Earth.

The 6.06 magnitude companion star is a B-type main sequence star with a classification of B9 V. On average the two stars are separated by about 0.6 arcseconds and have an orbital period of roughly 554 years. Based upon their orbital elements, the system has a combined mass of around {{nowrap|6.5 ± 2.8}} times the mass of the Sun.

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

| 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 | last=Wilson | first=Ralph Elmer | year=1953 | title=General catalogue of stellar radial velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institution of Washington | bibcode=1953GCRV..C......0W}}. Accessed 2007-05-14.

{{citation | last1=Abt | first1=Helmut A. | last2=Levato | first2=Hugo | last3=Grosso | first3=Monica | title=Rotational Velocities of B Stars | journal=The Astrophysical Journal | volume=573 | issue=1 | pages=359–365 |date=July 2002 | doi=10.1086/340590 | bibcode=2002ApJ...573..359A | postscript=. | doi-access=free }}

{{citation | last=Allen | first=R. H. | author-link=Richard Hinckley Allen | year=1899 | page=39 | title=Star-names and Their Meanings | publisher=G. E. Stechart | location=New York | ref=Allen | postscript=. }}

{{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 | year=1966 | page=99 | bibcode=1966CoLPL...4...99J | postscript=. }}

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

{{citation | display-authors=1 | last1=Silaj | first1=J. | last2=Jones | first2=C. E. | last3=Tycner | first3=C. | last4=Sigut | first4=T. A. A. | last5=Smith | first5=A. D. | title=A Systematic Study of Hα Profiles of Be Stars | journal=The Astrophysical Journal Supplement | volume=187 | issue=1 | pages=228–250 |date=March 2010 | doi=10.1088/0067-0049/187/1/228 | bibcode=2010ApJS..187..228S | s2cid=122679154 | postscript=. | doi-access=free }}

{{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 }}

{{cite simbad | title=* phi And | access-date=2012-06-25 }}

{{citation | display-authors=1 | last1=Muterspaugh | first1=Matthew W. | last2=Hartkopf | first2=William I. | last3=Lane | first3=Benjamin F. | last4=O'Connell | first4=J. | last5=Williamson | first5=M. | last6=Kulkarni | first6=S. R. | last7=Konacki | first7=Maciej | last8=Burke | first8=Bernard F. | last9=Colavita | first9=M. M. | title=The Phases Differential Astrometry Data Archive. II. Updated Binary Star Orbits and a Long Period Eclipsing Binary | journal=The Astronomical Journal | volume=140 | issue=6 | pages=1623–1630 |date=December 2010 | doi=10.1088/0004-6256/140/6/1623 | bibcode=2010AJ....140.1623M | postscript=. |arxiv = 1010.4043 | s2cid=6030289 }}

{{citation| last1=Soubiran | first1=Caroline | last2=Le Campion | first2=Jean-François| last3=Brouillet | first3=Nathalie | last4=Chemin |first4=Laurent| title=The PASTEL catalogue: 2016 version| journal=Astronomy & Astrophysics | display-authors=1| volume=591 | pages=A118 | year=2016| bibcode=2016A&A...591A.118S | doi=10.1051/0004-6361/201628497| arxiv=1605.07384 | s2cid=119258214 | postscript=. }}

}}

External links

  • [http://aladin.u-strasbg.fr/AladinPreview?-c=BD%2B46+++275A&ident=BD%2B46+++275A&submit=Aladin+previewer Image φ Andromedae]
  • [https://web.archive.org/web/20061216203451/http://www.astro.uiuc.edu/~kaler/sow/phiand.html www.astro.uiuc.edu/]
  • [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%20335 HR 0335]
  • [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J01095%2b4715AB CCDM J01095+4715AB]

{{Stars of Andromeda}}

{{DEFAULTSORT:Phi Andromedae}}

Andromedae, Phi

Category:Andromeda (constellation)

Category:Binary stars

Category:B-type main-sequence stars

Category:B-type subgiants

Category:Emission-line stars

Andromedae, 42

006811

005434

0335

BD+46 0275