Tau Andromedae: Difference between revisions

{{distinguish| text=[[T Andromedae]] }}

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

{{Starbox begin}}

{{Starbox image

| image =

{{Location mark

| image=Andromeda IAU.svg

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

| mark=Red circle.svg | mark_width=10 | mark_link=τ And

| x%=31.4 | y%=44.0

}}

| caption=Location of τ Andromedae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = [[Andromeda (constellation)|Andromeda]]

| ra = {{RA|01|40|34.81619}}<ref name="Gaia EDR3"/>

| dec = {{DEC|+40|34|37.3397}}<ref name="Gaia EDR3"/>

| appmag_v = +4.94<ref name=clpl4_99/>

}}

{{Starbox character

| class = B5&nbsp;III<ref name=apj694_2_1085/>

| b-v = −0.09<ref name=clpl4_99/>

| u-b = −0.41<ref name=clpl4_99/>

| variable =

}}

{{Starbox astrometry

| radial_v = {{val|−13.9|2.6}}<ref name=Gontcharov2006/>

| prop_mo_ra = {{val|17.889|(178)}}<ref name="Gaia EDR3"/>

| prop_mo_dec = {{val|−20.981|(95)}}<ref name="Gaia EDR3"/>

| parallax = 4.7804

| p_error = 0.1304

| parallax_footnote = <ref name="Gaia EDR3"/>

| absmag_v =

}}

{{Starbox detail

| mass =

| radius =

| luminosity = 851<ref name=apjss176_1_276/>

| temperature = {{val|12680|100|fmt=commas}}<ref name=Huang_et_al_2010/>

| gravity = {{val|3.357|0.020}}<ref name=Huang_et_al_2010/>

| metal_fe =

| age_myr = 217<ref name=Gontcharov2012/>

| rotational_velocity = {{val|74|13}}<ref name=Huang_et_al_2010/>

}}

{{Starbox catalog

| names = {{odlist | B=τ And | F=53&nbsp;And | BD=+39&nbsp;378 | HD=10205 | HIP=7818 | HR=477 | SAO=37418 | PPM=44297 }}<ref name=SIMBAD/>

}}

{{Starbox reference

|Simbad=tau+And

}}

'''Tau Andromedae''', [[Romanization of Greek|Latinized]] from τ Andromedae, is the [[Bayer designation]] for a single<ref name=Eggleton_Tokovinin_2008/> [[star]] in the northern [[constellation]] of [[Andromeda (constellation)|Andromeda]]. It has an [[apparent visual magnitude]] of +4.94,<ref name=clpl4_99/> which is [[Bortle Dark-Sky Scale|bright enough]] to be viewed from dark suburban skies. From [[parallax]] measurements made during the [[Gaia (spacecraft)|Gaia]] mission, the distance to this star can be estimated as roughly {{Convert|680|ly|pc|abbr=off|lk=on}} from Earth. The brightness of this star is diminished by 0.24 in magnitude due to [[extinction (astronomy)|extinction]] caused by intervening gas and dust.<ref name=apj694_2_1085/> It is drifting closer to the Sun with a [[radial velocity]] of −14&nbsp;km/s.<ref name=Gontcharov2006/>

The [[stellar spectrum|spectrum]] of this star matches a [[stellar classification]] of B5&nbsp;III,<ref name=apj694_2_1085/> with the [[luminosity class]] of III indicating that this is a [[giant star]]. It is radiating about 851 times the luminosity of the Sun<ref name=apjss176_1_276/> from its [[photosphere]] at an [[effective temperature]] of 12,670&nbsp;K.<ref name=Huang_et_al_2010/> The star is an estimated 217<ref name=Gontcharov2012/>&nbsp;million years old and is spinning with a high [[projected rotational velocity]] of ~74&nbsp;km/s.<ref name=Huang_et_al_2010/>

==Naming==

In [[Chinese astronomy|Chinese]], {{lang|zh|天大將軍}} ({{lang|zh-Latn|Tiān Dà Jiāng Jūn}}), meaning ''[[Bond (Chinese constellation)|Heaven's Great General]]'', refers to an asterism consisting of τ Andromedae, [[Gamma Andromedae|γ Andromedae]], [[Phi Persei|φ Persei]], [[51 Andromedae]], [[49 Andromedae]], [[Chi Andromedae|χ Andromedae]], [[Upsilon Andromedae|υ Andromedae]], [[56 Andromedae]], [[Beta Trianguli|β Trianguli]], [[Gamma Trianguli|γ Trianguli]] and [[Delta Trianguli|δ Trianguli]]. Consequently, the [[Chinese star names|Chinese name]] for τ Andromedae itself is {{lang|zh|天大將軍七}} ({{lang|zh-Latn|Tiān Dà Jiāng Jūn qī}}, {{lang-en|the Seventh Star of Heaven's Great General}}.).<ref>{{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]</ref>

{{reflist|refs=

<ref name=Gontcharov2012>{{citation

| title=Spatial distribution and kinematics of OB stars

| last1=Gontcharov | first1=G. A.

| journal=Astronomy Letters

| volume=38 | issue=11 | pages=694–706 | date=November 2012

| doi=10.1134/S1063773712110035 | bibcode=2012AstL...38..694G

| arxiv=1606.09028 | s2cid=119108982 | postscript=. }}</ref>

<ref name=Gontcharov2006>{{citation

| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system

| last=Gontcharov | first=G. A.

| journal=Astronomy Letters | postscript=.

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

| doi=10.1134/S1063773706110065 | arxiv=1606.08053

| bibcode=2006AstL...32..759G | s2cid=119231169 }}</ref>

<ref name="Gaia EDR3">{{Cite Gaia EDR3|347218835681961344}}</ref>

<ref name=apj694_2_1085>{{citation

| last1=van Belle | first1=Gerard T. | last2=von Braun | first2=Kaspar

| title=Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars

| journal=The Astrophysical Journal

| volume=694 | issue=2 | pages=1085–1098 | date=April 2009

| doi=10.1088/0004-637X/694/2/1085 | bibcode=2009ApJ...694.1085V

| postscript=. | arxiv=0901.1206 | s2cid=18370219 }}</ref>

<ref name=clpl4_99>{{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=. }}</ref>

<ref name=SIMBAD>{{cite simbad | title=* tau And | access-date=2012-06-24 }}</ref>

<ref name=apjss176_1_276>{{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 | s2cid=10713221 }}</ref>

<ref name=Huang_et_al_2010>{{citation

| display-authors=1 | last1=Huang | first1=Wenjin

| last2=Gies | first2=D. R. | last3=McSwain | first3=M. V.

| title=A Stellar Rotation Census of B Stars: From ZAMS to TAMS

| journal=Astrophysical Journal|language=en

| volume=722 | issue=1 | pages=605–619 | date=October 2010

| doi=10.1088/0004-637X/722/1/605 | issn=0004-637X

| bibcode=2010ApJ...722..605H | arxiv=1008.1761

| s2cid=118532653 | postscript=. }}</ref>

<ref name=Eggleton_Tokovinin_2008>{{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 | bibcode=2008MNRAS.389..869E

| postscript=. | arxiv=0806.2878 | s2cid=14878976 }}</ref>

}}

==External links==

{{DEFAULTSORT:Tau Andromedae}}

[[Category:B-type giants]]

[[Category:Andromeda (constellation)]]

[[Category:Bayer objects|Andromedae, Tau]]

[[Category:Durchmusterung objects|BD+39 0378]]

[[Category:Flamsteed objects|Andromedae, 53]]

[[Category:Henry Draper Catalogue objects|010205]]

[[Category:Hipparcos objects|007818]]

[[Category:Bright Star Catalogue objects|0477]]