31 Aquilae: Difference between revisions
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{{Short description|Star in the constellation Aquila}} |
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{{about-distinguish|b Aquilae|beta Aquilae{{!}}β Aquilae}} |
{{about-distinguish|b Aquilae|beta Aquilae{{!}}β Aquilae}} |
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31 Aquilae has an [[apparent visual magnitude]] of 5.16,<ref name=aass85_3_1015/> making it bright enough to be seen with the naked eye in dark skies. The annual [[parallax]] shift of 65.89 [[milliarcsecond|mas]]<ref name=aaa474_2_653/> yields a distance estimate of {{Convert|49.5|ly|pc|abbr=off|lk=on}} from Earth. It is a [[variable star]] with a magnitude change of less than 0.02.<ref name=aaa535_A42/> |
31 Aquilae has an [[apparent visual magnitude]] of 5.16,<ref name=aass85_3_1015/> making it bright enough to be seen with the naked eye in dark skies. The annual [[parallax]] shift of 65.89 [[milliarcsecond|mas]]<ref name=aaa474_2_653/> yields a distance estimate of {{Convert|49.5|ly|pc|abbr=off|lk=on}} from Earth. It is a [[variable star]] with a magnitude change of less than 0.02.<ref name=aaa535_A42/> |
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With a [[stellar classification]] of G8 IV,<ref name=aass85_3_1015/> the [[luminosity class]] of IV indicates this is a [[subgiant star]]. Compared to the Sun, it has 116%<ref name=aaa535_A42/> of the mass and 138%<ref name=apj746_1_101/> of the radius. It is radiating nearly double<ref name=apj746_1_101/> the luminosity of the Sun from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 5,510 K,<ref name=aass85_3_1015/> giving it the yellow hue of |
With a [[stellar classification]] of G8 IV,<ref name=aass85_3_1015/> the [[luminosity class]] of IV indicates this is a [[subgiant star]]. Compared to the Sun, it has 116%<ref name=aaa535_A42/> of the mass and 138%<ref name=apj746_1_101/> of the radius. It is radiating nearly double<ref name=apj746_1_101/> the luminosity of the Sun from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 5,510 K,<ref name=aass85_3_1015/> giving it the yellow hue of a [[G-type star]].<ref name=csiro/> Its age is probably similar to [[NGC 188]], the oldest open cluster known, which was calculated to be over 5 billion years. For its age, it is surprisingly rich in elements other than hydrogen or helium, contrary to common assumptions that the oldest stars should be [[metal-poor]]. |
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No certain substellar companion has been detected so far around 31 Aquilae. [[McDonald Observatory]] team has set limits to the presence of one or more planets <ref name=search>Detection Limits from the McDonald Observatory Planet Search Program</ref> around 31 Aquilae with masses between 0.22 and 1.9 [[Jupiter masses]] and average separations spanning between 0.05 and 5.2 [[Astronomical Units]]. |
No certain substellar companion has been detected so far around 31 Aquilae. [[McDonald Observatory]] team has set limits to the presence of one or more planets <ref name=search>Detection Limits from the McDonald Observatory Planet Search Program</ref> around 31 Aquilae with masses between 0.22 and 1.9 [[Jupiter masses]] and average separations spanning between 0.05 and 5.2 [[Astronomical Units]]. |
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{{Reflist|refs= |
{{Reflist|refs= |
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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 }}</ref> |
<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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<ref name=aass85_3_1015>{{citation | last1=Malagnini | first1=M. L. | last2=Morossi | first2=C. | title=Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars | journal=Astronomy and Astrophysics Supplement Series | volume=85 | issue=3 | pages=1015–1019 | bibcode=1990A&AS...85.1015M | postscript=. |date=November |
<ref name=aass85_3_1015>{{citation | last1=Malagnini | first1=M. L. | last2=Morossi | first2=C. | title=Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars | journal=Astronomy and Astrophysics Supplement Series | volume=85 | issue=3 | pages=1015–1019 | bibcode=1990A&AS...85.1015M | postscript=. |date=November 1990}}</ref> |
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<ref name=aaa480_1_91>{{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Bienaymé | first2=O. | last3=Mishenina | first3=T. V. | last4=Kovtyukh | first4=V. V. | title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants | journal=Astronomy and Astrophysics | year=2008 | volume=480 | issue=1 | pages=91–101 | bibcode=2008A&A...480...91S | doi=10.1051/0004-6361:20078788 | postscript=. |arxiv = 0712.1370 }}</ref> |
<ref name=aaa480_1_91>{{citation | display-authors=1 | last1=Soubiran | first1=C. | last2=Bienaymé | first2=O. | last3=Mishenina | first3=T. V. | last4=Kovtyukh | first4=V. V. | title=Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants | journal=Astronomy and Astrophysics | year=2008 | volume=480 | issue=1 | pages=91–101 | bibcode=2008A&A...480...91S | doi=10.1051/0004-6361:20078788 | postscript=. |arxiv = 0712.1370 | s2cid=16602121 }}</ref> |
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<ref name=scfs>{{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 | year=1999 | bibcode=1999VeARI..35....1W | postscript=. }}</ref> |
<ref name=scfs>{{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. | journal=Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | volume=35 | page=1 | bibcode=1999VeARI..35....1W | postscript=. }}</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=aaa535_A42>{{citation | display-authors=1 | last1=Trevisan | first1=M. | last2=Barbuy | first2=B. | last3=Eriksson | first3=K. | last4=Gustafsson | first4=B. | last5=Grenon | first5=M. | last6=Pompéia | first6=L. | title=Analysis of old very metal rich stars in the solar neighbourhood | journal=Astronomy & Astrophysics | volume=535 | page=A42 | doi=10.1051/0004-6361/201016056 | bibcode=2011A&A...535A..42T | postscript=. |arxiv = 1109.6304 |date=November |
<ref name=aaa535_A42>{{citation | display-authors=1 | last1=Trevisan | first1=M. | last2=Barbuy | first2=B. | last3=Eriksson | first3=K. | last4=Gustafsson | first4=B. | last5=Grenon | first5=M. | last6=Pompéia | first6=L. | title=Analysis of old very metal rich stars in the solar neighbourhood | journal=Astronomy & Astrophysics | volume=535 | page=A42 | doi=10.1051/0004-6361/201016056 | bibcode=2011A&A...535A..42T | postscript=. |arxiv = 1109.6304 |date=November 2011| s2cid=49565866 }} See Table 13.</ref> |
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<ref name=apj746_1_101>{{citation | display-authors=1 | last1=Boyajian | first1=Tabetha S. | last2=McAlister | first2=Harold A. | last3=van Belle | first3=Gerard | last4=Gies | first4=Douglas R. | last5=ten Brummelaar | first5=Theo A. | last6=von Braun | first6=Kaspar | last7=Farrington | first7=Chris | last8=Goldfinger | first8=P. J. | last9=O'Brien | first9=David | last10=Parks | first10=J. Robert | last11=Richardson | first11=Noel D. | last12=Ridgway | first12=Stephen | last13=Schaefer | first13=Gail | last14=Sturmann | first14=Laszlo | last15=Sturmann | first15=Judit | last16=Touhami | first16=Yamina | last17=Turner | first17=Nils H. | last18=White | first18=Russel | title=Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars | journal=The Astrophysical Journal | volume=746 | issue=1 | page=101 | doi=10.1088/0004-637X/746/1/101 | bibcode=2012ApJ...746..101B | postscript=. |arxiv = 1112.3316 |date=February |
<ref name=apj746_1_101>{{citation | display-authors=1 | last1=Boyajian | first1=Tabetha S. | last2=McAlister | first2=Harold A. | last3=van Belle | first3=Gerard | last4=Gies | first4=Douglas R. | last5=ten Brummelaar | first5=Theo A. | last6=von Braun | first6=Kaspar | last7=Farrington | first7=Chris | last8=Goldfinger | first8=P. J. | last9=O'Brien | first9=David | last10=Parks | first10=J. Robert | last11=Richardson | first11=Noel D. | last12=Ridgway | first12=Stephen | last13=Schaefer | first13=Gail | last14=Sturmann | first14=Laszlo | last15=Sturmann | first15=Judit | last16=Touhami | first16=Yamina | last17=Turner | first17=Nils H. | last18=White | first18=Russel | title=Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars | journal=The Astrophysical Journal | volume=746 | issue=1 | page=101 | doi=10.1088/0004-637X/746/1/101 | bibcode=2012ApJ...746..101B | postscript=. |arxiv = 1112.3316 |date=February 2012| s2cid=18993744 }} See Table 10.</ref> |
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<ref name=csiro>{{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 | |
<ref name=csiro>{{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 |access-date=2012-01-16 |url-status=dead |archive-url=https://web.archive.org/web/20120222183238/http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html |archive-date=February 22, 2012 }}</ref> |
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<ref name=SIMBAD>{{ |
<ref name=SIMBAD>{{cite simbad | title=* b Aql | access-date=2012-07-22 }}</ref> |
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}} |
}} |
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{{Stars of Aquila}} |
{{Stars of Aquila}} |
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{{DEFAULTSORT:31 Aquilae}} |
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[[Category:Bayer objects|Aquilae, b]] |
[[Category:Bayer objects|Aquilae, b]] |
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[[Category:Flamsteed objects|Aquilae, 31]] |
[[Category:Flamsteed objects|Aquilae, 31]] |
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[[Category:G-type subgiants]] |
[[Category:G-type subgiants]] |
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[[Category:Hipparcos objects|095447]] |
[[Category:Hipparcos objects|095447]] |
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[[Category: |
[[Category:Bright Star Catalogue objects|7373]] |
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[[Category:Durchmusterung objects|BD+11 3833]] |
[[Category:Durchmusterung objects|BD+11 3833]] |
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[[Category:Gliese and GJ objects|0759]] |
[[Category:Gliese and GJ objects|0759]] |
Latest revision as of 06:42, 27 March 2022
Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Aquila |
Right ascension | 19h 24m 58.20027s[1] |
Declination | +11° 56′ 39.8862″[1] |
Apparent magnitude (V) | 5.16[2] |
Characteristics | |
Spectral type | G8 IV[2] |
U−B color index | +0.42[3] |
B−V color index | +0.77[2] |
Astrometry | |
Radial velocity (Rv) | –100.5[4] km/s |
Proper motion (μ) | RA: +721.02[1] mas/yr Dec.: +642.49[1] mas/yr |
Parallax (π) | 65.89 ± 0.26 mas[1] |
Distance | 49.5 ± 0.2 ly (15.18 ± 0.06 pc) |
Absolute bolometric magnitude (Mbol) | 4.01[5] |
Details | |
Mass | 1.16 ± 0.07[5] M☉ |
Radius | 1.379 ± 0.042[6] R☉ |
Luminosity | 1.904 ± 0.045[6] L☉ |
Surface gravity (log g) | 4.18 ± 0.03[5] cgs |
Temperature | 5,510 ± 90[2] K |
Metallicity [Fe/H] | +0.37[7] dex |
Age | 4.5 ± 0.2[5] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
31 Aquilae (abbreviated 31 Aql) is a star in the equatorial constellation of Aquila. 31 Aquilae is its Flamsteed designation though it also bears the Bayer designation b Aquilae. This star has an apparent visual magnitude of 5.16 and is 49.5 light years from Earth. It has no known companions.
Properties
[edit]31 Aquilae has an apparent visual magnitude of 5.16,[2] making it bright enough to be seen with the naked eye in dark skies. The annual parallax shift of 65.89 mas[1] yields a distance estimate of 49.5 light-years (15.2 parsecs) from Earth. It is a variable star with a magnitude change of less than 0.02.[5]
With a stellar classification of G8 IV,[2] the luminosity class of IV indicates this is a subgiant star. Compared to the Sun, it has 116%[5] of the mass and 138%[6] of the radius. It is radiating nearly double[6] the luminosity of the Sun from its outer atmosphere at an effective temperature of 5,510 K,[2] giving it the yellow hue of a G-type star.[9] Its age is probably similar to NGC 188, the oldest open cluster known, which was calculated to be over 5 billion years. For its age, it is surprisingly rich in elements other than hydrogen or helium, contrary to common assumptions that the oldest stars should be metal-poor.
No certain substellar companion has been detected so far around 31 Aquilae. McDonald Observatory team has set limits to the presence of one or more planets [10] around 31 Aquilae with masses between 0.22 and 1.9 Jupiter masses and average separations spanning between 0.05 and 5.2 Astronomical Units.
Optical companions
[edit]The following stars are optical companions that are coincidentally aligned near the line of sight to 31 Aquilae.
Companion | HD 231345 | BD+11 3833C |
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Right ascension | 19h 24m 51.8595s | 19h 24m 50.8s |
Declination | +11° 57′ 14.692″ | +11° 57′ 36″ |
Magnitude | 8.56 | 10.6 |
Spectral type | G0 | |
Reference | Simbad | Simbad |
References
[edit]- ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d e f g Malagnini, M. L.; Morossi, C. (November 1990), "Accurate absolute luminosities, effective temperatures, radii, masses and surface gravities for a selected sample of field stars", Astronomy and Astrophysics Supplement Series, 85 (3): 1015–1019, Bibcode:1990A&AS...85.1015M.
- ^ Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
- ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
- ^ a b c d e f Trevisan, M.; et al. (November 2011), "Analysis of old very metal rich stars in the solar neighbourhood", Astronomy & Astrophysics, 535: A42, arXiv:1109.6304, Bibcode:2011A&A...535A..42T, doi:10.1051/0004-6361/201016056, S2CID 49565866. See Table 13.
- ^ a b c d Boyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal, 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101, S2CID 18993744. See Table 10.
- ^ Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
- ^ "* b Aql". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-22.
- ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on February 22, 2012, retrieved 2012-01-16
- ^ Detection Limits from the McDonald Observatory Planet Search Program
External links
[edit]- The Old Disk Metal-Rich Subgiant 31 Aquilae doi:10.1086/151065
- Image 31 Aquilae
- HR 7373
- CCDM 19249+1157
- R.A. Wittenmeyer et al., "Detection Limits from the McDonald Observatory Planet Search Program", The Astronomical Journal, Volume 132, Issue 1, pp. 177–188, May 2006.