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31 Aquilae

{{Short description|Star in the constellation Aquila}}

{{about-distinguish|b Aquilae|beta Aquilae{{!}}β Aquilae}}

{{Starbox begin}}

{{Starbox image

| image=

{{Location mark

|image=Aquila constellation map.svg|alt=|float=center|width=260

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=31 Aquilae

|x=614|y=254

}}

| caption=Location of 31 Aquilae (circled)

}}

{{Starbox observe

| epoch = J2000

| constell = Aquila

| ra = {{RA|19|24|58.20027}}

| dec = {{DEC|+11|56|39.8862}}

| appmag_v = 5.16

}}

{{Starbox character

| class = G8 IV

| b-v = +0.77

| u-b = +0.42

| r-i =

| v-r =

| variable =

}}

{{Starbox astrometry

| radial_v = −100.5

| prop_mo_ra = +721.02

| prop_mo_dec = +642.49

| parallax = 65.89

| p_error = 0.26

| parallax_footnote =

| absmag_v = +4.26

}}

{{Starbox detail

| mass = {{val|1.16|0.07}}

| radius = {{val|1.379|0.042}}

| luminosity = {{val|1.904|0.045}}

| temperature = {{val|fmt=commas|5,510|90}}

| metal_fe = +0.37

| rotational_velocity =

| gravity = {{val|4.18|0.03}}

| age_gyr = {{val|4.5|0.2}}

}}

{{Starbox catalog

| names= BD+11 3833, FK5 1503, HD 182572, GJ 759, NLTT 47763, HIP 95447, HR 7373, LFT 1477, LHS 3463, LTT 15668, NSV 11994, SAO 104807.

}}

{{Starbox reference

|Simbad=31+Aql

}}

{{Starbox end}}

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

31 Aquilae has an apparent visual magnitude of 5.16, making it bright enough to be seen with the naked eye in dark skies. The annual parallax shift of 65.89 mas 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.

With a stellar classification of G8 IV, the luminosity class of IV indicates this is a subgiant star. Compared to the Sun, it has 116% of the mass and 138% of the radius. It is radiating nearly double the luminosity of the Sun from its outer atmosphere at an effective temperature of 5,510 K, giving it the yellow hue of a G-type star. 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 Detection Limits from the McDonald Observatory Planet Search Program 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

The following stars are optical companions that are coincidentally aligned near the line of sight to 31 Aquilae.

class=wikitable

!style="text-align: left;"| Companion

| HD 231345

| BD+11 3833C

style="text-align: left;"| Right ascension

| {{RA|19|24|51.8595}}

| {{RA|19|24|50.8}}

style="text-align: left;"| Declination

| {{DEC|+11|57|14.692}}

| {{DEC|+11|57|36}}

style="text-align: left;"| Magnitude

| 8.56

| 10.6

style="text-align: left;"| Spectral type

| G0

|

style="text-align: left;"| Reference

| [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=HD%20231345 Simbad]

| [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=BD%2b11%20%203833C Simbad]

References

{{Reflist|refs=

{{citation |postscript=. |bibcode=2012AstL...38..331A |title=XHIP: An extended hipparcos compilation |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |journal=Astronomy Letters |date=2012 |volume=38 |issue=5 |page=331 |doi=10.1134/S1063773712050015 |arxiv=1108.4971 }}

{{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 | 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}}

{{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 }}

{{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=. }}

{{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 | 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.

{{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.

{{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 }}

{{cite simbad | title=* b Aql | access-date=2012-07-22 }}

}}

External links

  • The Old Disk Metal-Rich Subgiant 31 Aquilae {{doi|10.1086/151065}}
  • [http://aladin.u-strasbg.fr/AladinPreview?-c=NSV+11994&ident=NSV+11994&submit=Aladin+previewer Image 31 Aquilae]
  • [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?HR%207373 HR 7373]
  • [http://webviz.u-strasbg.fr/viz-bin/VizieR-S?CCDM%20J19249%2b1157A 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.

{{Stars of Aquila}}

{{DEFAULTSORT:31 Aquilae}}

Aquilae, b

Aquilae, 31

182572

Category:Spectroscopic binaries

Category:Aquila (constellation)

Category:G-type subgiants

095447

7373

BD+11 3833

0759