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| name = Tau Aquilae
}}{{Starbox image
| image =
| caption = Location of τ Aquilae (circled)
}}{{Starbox observe
| epoch = J2000.0
| constell = Aquila
| ra = {{RA|20|04|08.31550}}
| dec = {{DEC|+07|16|40.6683}}
| appmag_v = {{nowrap|5.6799 ± 0.0009}}[3]
}}{{Starbox character
| class = K0 III[4]
| r-i =
| v-r =
| b-v = +1.06[5]
| u-b = +0.86[5]
| variable =
}}{{Starbox astrometry
| radial_v = {{nowrap|–29.52 ± 0.23}}[3]
| prop_mo_ra = +14.74
| prop_mo_dec = +12.10
| parallax = 7.06
| p_error = 0.41
| parallax_footnote =
| absmag_v = −0.24[11]
}}{{Starbox detail
| mass =
| radius = 16.5[12]
| metal_fe = –0.15[4]
| gravity = 2.69[4]
| luminosity = 161[11]
| temperature = 4,660[4]
| rotational_velocity =
| age_gyr =
}}{{Starbox catalog
| names = τ Aql, 63 Aquilae, BD+06 4416, FK5 1524, HD 190327, HR 7669, HIP 98823, SAO 125403.[17]
}}{{Starbox reference
|Simbad=tau+Aql
}}{{Starbox end}}Tau Aquilae, Latinized from τ Aquilae, is the Bayer designation for a star in the equatorial constellation of Aquila. The apparent visual magnitude of 5.7[3] indicates it is a faint star that is visible to the naked eye from suburban skies; at least according to the Bortle Dark-Sky Scale. The annual orbital motion of the Earth causes a parallax shift of 7.06 mas, which means the distance to this star is approximately {{Convert|460|ly|pc|abbr=off}}. The magnitude of the star is diminished by 0.28 from extinction caused by interstellar gas and dust.[3]
The spectrum of Tau Aquilae matches a stellar classification of K0 III,[4] with the luminosity class of III suggesting this is an evolved giant star that has exhausted the supply of hydrogen at its core and left the main sequence of stars like the Sun. The measured angular diameter of this star is {{nowrap|1.08 ± 0.01 mas}}.[22] At the estimated distance of this system, this yields a physical size of about 16.5 times the radius of the Sun.[12] The outer envelope is radiating energy into space with an effective temperature of 4,660 K,[4] giving it the orange hued glow of a K-type star.[25]
References
1. ^1 2 {{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 | postscript=. }}
2. ^1 2 3 4 5 6 {{citation | last1=McWilliam | first1=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. }}
3. ^1 2 3 4 {{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}
4. ^1 2 {{citation | last1=Johnson | display-authors=1 | 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=. }}
5. ^1 {{cite simbad | title=* tau Aql | accessdate=2012-07-21 | postscript=. }}
6. ^1 {{citation | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
7. ^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::
8. ^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=2012-01-16 }}
[1][2][3][4][5][6][7][8]2. ^1 2 3 4 5 6 {{citation | last1=McWilliam | first1=Andrew | title=High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances | journal=Astrophysical Journal Supplement Series | volume=74 | pages=1075–1128 |date=December 1990 | doi=10.1086/191527 | bibcode=1990ApJS...74.1075M | postscript=. }}
3. ^1 2 3 4 {{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}
4. ^1 2 {{citation | last1=Johnson | display-authors=1 | 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=. }}
5. ^1 {{cite simbad | title=* tau Aql | accessdate=2012-07-21 | postscript=. }}
6. ^1 {{citation | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
7. ^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::
8. ^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=2012-01-16 }}
}}
External links
- Image Tau Aquilae
8 : Henry Draper Catalogue objects|Bayer objects|Aquila (constellation)|K-type giants|Hipparcos objects|Flamsteed objects|HR objects|Durchmusterung objects
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