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{{distinguish| text=[[T Andromedae]] }} |
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{{short description|Star in the constellation Andromeda}} |
{{short description|Star in the constellation Andromeda}} |
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{{Starbox begin |
{{Starbox begin}} |
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}} |
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{{Starbox image |
{{Starbox image |
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| image = |
| image = |
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{{Location mark |
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<div style="position: relative">[[File:Andromeda IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Andromeda constellation and its surroundings]] |
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| image=Andromeda IAU.svg |
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<div style="position: absolute; left: 28.7%; top: 41.0%;">[[File:Cercle rouge 100%.svg|12px]]</div> |
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| float=center | width=240 | position=right |
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</div> |
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| mark=Red circle.svg | mark_width=10 | mark_link=τ And |
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| x%=31.4 | y%=44.0 |
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}} |
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| caption=Location of τ Andromedae (circled) |
| caption=Location of τ Andromedae (circled) |
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}} |
}} |
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{{Starbox observe |
{{Starbox observe |
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| epoch = J2000 |
| epoch = J2000 |
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⚫ | |||
⚫ | |||
⚫ | |||
| constell = [[Andromeda (constellation)|Andromeda]] |
| constell = [[Andromeda (constellation)|Andromeda]] |
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⚫ | |||
⚫ | |||
}} |
}} |
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{{Starbox character |
{{Starbox character |
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| class = B5 III<ref name=apj694_2_1085/> |
| class = B5 III<ref name=apj694_2_1085/> |
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| b-v = |
| b-v = −0.09<ref name=clpl4_99/> |
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| u-b = |
| u-b = −0.41<ref name=clpl4_99/> |
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| variable = |
| variable = |
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}} |
}} |
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{{Starbox astrometry |
{{Starbox astrometry |
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| radial_v = |
| radial_v = {{val|−13.9|2.6}}<ref name=Gontcharov2006/> |
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| prop_mo_ra = |
| prop_mo_ra = {{val|17.889|(178)}}<ref name="Gaia EDR3"/> |
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| prop_mo_dec = |
| prop_mo_dec = {{val|−20.981|(95)}}<ref name="Gaia EDR3"/> |
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| parallax = 4. |
| parallax = 4.7804 |
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| p_error = 0. |
| p_error = 0.1304 |
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| parallax_footnote = <ref name= |
| parallax_footnote = <ref name="Gaia EDR3"/> |
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| absmag_v = |
| absmag_v = |
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}} |
}} |
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{{Starbox detail |
{{Starbox detail |
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| mass = |
| mass = |
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| radius = |
| radius = |
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| luminosity = 851<ref name=apjss176_1_276/> |
| luminosity = 851<ref name=apjss176_1_276/> |
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| temperature = |
| temperature = {{val|12680|100|fmt=commas}}<ref name=Huang_et_al_2010/> |
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| gravity = 3.357<ref name= |
| gravity = {{val|3.357|0.020}}<ref name=Huang_et_al_2010/> |
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| metal_fe = |
| metal_fe = |
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| age_myr = 217<ref name=Gontcharov2012/> |
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| age_gyr = |
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| rotational_velocity = |
| rotational_velocity = {{val|74|13}}<ref name=Huang_et_al_2010/> |
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}} |
}} |
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{{Starbox catalog |
{{Starbox catalog |
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| names = |
| names = {{odlist | B=τ And | F=53 And |BD=+39 378 |HD=10205 | HIP=7818 |HR=477 | SAO=37418 | PPM=44297 }}<ref name=SIMBAD/> |
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}} |
}} |
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{{Starbox reference |
{{Starbox reference |
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{{Starbox end}} |
{{Starbox end}} |
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'''Tau Andromedae''' |
'''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 km/s.<ref name=Gontcharov2006/> |
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The [[stellar spectrum|spectrum]] of this star matches a [[stellar classification]] of B5 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 |
The [[stellar spectrum|spectrum]] of this star matches a [[stellar classification]] of B5 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 K.<ref name=Huang_et_al_2010/> The star is an estimated 217<ref name=Gontcharov2012/> million years old and is spinning with a high [[projected rotational velocity]] of ~74 km/s.<ref name=Huang_et_al_2010/> |
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==Naming== |
==Naming== |
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{{reflist|refs= |
{{reflist|refs= |
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<ref name=Gontcharov2012>{{citation |
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<ref name=aaa474_2_653>{{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 }}</ref> |
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| title=Spatial distribution and kinematics of OB stars |
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| last1=Gontcharov | first1=G. A. |
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| journal=Astronomy Letters |
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| volume=38 | issue=11 | pages=694–706 | date=November 2012 |
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| doi=10.1134/S1063773712110035 | bibcode=2012AstL...38..694G |
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⚫ | | arxiv=1606.09028 | s2cid=119108982 | postscript=. }}</ref> |
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<ref name=Gontcharov2006>{{citation |
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<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> |
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| title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |
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| last=Gontcharov | first=G. A. |
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| journal=Astronomy Letters | postscript=. |
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| volume=32 | issue=11 | pages=759–771 | date=November 2006 |
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| doi=10.1134/S1063773706110065 | arxiv=1606.08053 |
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| bibcode=2006AstL...32..759G | s2cid=119231169 }}</ref> |
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<ref name="Gaia EDR3">{{Cite Gaia EDR3|347218835681961344}}</ref> |
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<ref name=gcsrv>{{citation | last=Wilson | first=Ralph Elmer | year=1953 | title=General Catalogue of Stellar Radial Velocities | publisher=Carnegie Institution of Washington | location=Washington | bibcode=1953GCRV..C......0W | postscript=. }}</ref> |
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<ref name=apj694_2_1085>{{citation |
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<ref name=apj573_1_359>{{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 }}</ref> |
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⚫ | | last1=van Belle | first1=Gerard T. | last2=von Braun | first2=Kaspar |
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| title=Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars |
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| journal=The Astrophysical Journal |
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| volume=694 | issue=2 | pages=1085–1098 | date=April 2009 |
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| doi=10.1088/0004-637X/694/2/1085 | bibcode=2009ApJ...694.1085V |
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| postscript=. | arxiv=0901.1206 | s2cid=18370219 }}</ref> |
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<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 | bibcode=1966CoLPL...4...99J | postscript=. }}</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> |
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<ref name=SIMBAD>{{cite simbad | title=* tau And | |
<ref name=SIMBAD>{{cite simbad | title=* tau And | access-date=2012-06-24 }}</ref> |
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<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=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> |
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<ref name= |
<ref name=Huang_et_al_2010>{{citation |
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| display-authors=1 | last1=Huang | first1=Wenjin |
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⚫ |
| last1= |
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| |
| last2=Gies | first2=D. R. | last3=McSwain | first3=M. V. |
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| title= |
| title=A Stellar Rotation Census of B Stars: From ZAMS to TAMS |
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| journal= |
| journal=Astrophysical Journal|language=en |
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| volume= |
| volume=722 | issue=1 | pages=605–619 | date=October 2010 |
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| doi=10.1088/0004-637X/722/1/605 | issn=0004-637X |
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| bibcode=2010ApJ...722..605H | arxiv=1008.1761 |
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⚫ |
| arxiv= |
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| s2cid=118532653 | postscript=. }}</ref> |
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<ref name=Eggleton_Tokovinin_2008>{{citation |
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| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. |
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| title=A catalogue of multiplicity among bright stellar systems |
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| journal=[[Monthly Notices of the Royal Astronomical Society]] |
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| volume=389 | issue=2 | pages=869–879 |date=September 2008 |
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| doi=10.1111/j.1365-2966.2008.13596.x | bibcode=2008MNRAS.389..869E |
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| postscript=. | arxiv=0806.2878 | s2cid=14878976 }}</ref> |
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}} |
}} |
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{{Stars of Andromeda}} |
{{Stars of Andromeda}} |
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[[Category:Bayer objects|Andromedae, Tau]] |
[[Category:Bayer objects|Andromedae, Tau]] |
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[[Category:Flamsteed objects|Andromedae, 53]] |
[[Category:Flamsteed objects|Andromedae, 53]] |
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⚫ | |||
[[Category:Henry Draper Catalogue objects|010205]] |
[[Category:Henry Draper Catalogue objects|010205]] |
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[[Category:Hipparcos objects|007818]] |
[[Category:Hipparcos objects|007818]] |
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[[Category: |
[[Category:Bright Star Catalogue objects|0477]] |
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⚫ |
Location of τ Andromedae (circled) | |
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Andromeda |
Right ascension | 01h40m 34.81619s[1] |
Declination | +40° 34′ 37.3397″[1] |
Apparent magnitude (V) | +4.94[2] |
Characteristics | |
Spectral type | B5 III[3] |
U−B color index | −0.41[2] |
B−V color index | −0.09[2] |
Astrometry | |
Radial velocity (Rv) | −13.9±2.6[4] km/s |
Proper motion (μ) | RA: 17.889(178)[1] mas/yr Dec.: −20.981(95)[1] mas/yr |
Parallax (π) | 4.7804 ± 0.1304 mas[1] |
Distance | 680 ± 20 ly (209 ± 6 pc) |
Details | |
Luminosity | 851[5] L☉ |
Surface gravity (log g) | 3.357±0.020[6] cgs |
Temperature | 12,680±100[6] K |
Rotational velocity (v sin i) | 74±13[6] km/s |
Age | 217[7] Myr |
Other designations | |
τ And, 53 And, BD+39 378, HD 10205, HIP 7818, HR 477, SAO 37418, PPM 44297[8] | |
Database references | |
SIMBAD | data |
Tau Andromedae, Latinized from τ Andromedae, is the Bayer designation for a single[9] star in the northern constellationofAndromeda. It has an apparent visual magnitude of +4.94,[2] which is bright enough to be viewed from dark suburban skies. From parallax measurements made during the Gaia mission, the distance to this star can be estimated as roughly 680 light-years (210 parsecs) from Earth. The brightness of this star is diminished by 0.24 in magnitude due to extinction caused by intervening gas and dust.[3] It is drifting closer to the Sun with a radial velocity of −14 km/s.[4]
The spectrum of this star matches a stellar classification of B5 III,[3] with the luminosity class of III indicating that this is a giant star. It is radiating about 851 times the luminosity of the Sun[5] from its photosphere at an effective temperature of 12,670 K.[6] The star is an estimated 217[7] million years old and is spinning with a high projected rotational velocity of ~74 km/s.[6]
InChinese, 天大將軍 (Tiān Dà Jiāng Jūn), meaning Heaven's Great General, refers to an asterism consisting of τ Andromedae, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, the Chinese name for τ Andromedae itself is 天大將軍七 (Tiān Dà Jiāng Jūn qī, English: the Seventh Star of Heaven's Great General.).[10]
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