108 Aquarii

{{about|i³ Aquarii|other star systems with this Bayer designation|i Aquarii}}

{{Starbox begin

| name = 108 Aquarii

}}

{{Starbox image

| image = 250px

| caption = The visual band light curve of 108 Aquarii, showing the variation over the star's 3.7352 day rotation period. Adapted from Adelman (1999)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|23|51|21.33832}}

| dec = {{DEC|−18|54|32.9937}}

| appmag_v = 5.194

| constell = Aquarius

}}

{{Starbox character

| class = A0VpSiSr

| b-v = −0.135

| u-b = −0.396

| variable = α² CVn

}}

{{Starbox astrometry

| radial_v = +12.7

| prop_mo_ra = +26.82

| prop_mo_dec = −4.27

| parallax = 10.23

| p_error = 0.31

| parallax_footnote =

| absmag_v = +0.08

}}

{{Starbox detail

| mass = {{val|3.21|0.15}}

| radius = {{val|2.5|0.3}}

| luminosity = 132

| temperature = 12,274

| metal_fe = +0.90

| gravity = {{val|4.27|0.10}}

| rotation = 3.75413 days

| rotational_velocity = 30

| age_myr =

}}

{{Starbox catalog

| names = {{odlist|BD=−19°6522|HD=223640|HIP=117629|HR=9031|SAO=165918}}

}}

108 Aquarii (abbreviated 108 Aqr) is a star in the equatorial constellation of Aquarius. 108 Aquarii is the Flamsteed designation, although it also bears the Bayer designation i³ Aquarii and the variable star designation ET Aquarii. It has an apparent visual magnitude of 5.194 and can be seen with the naked eye under suitably dark skies. Based upon an annual parallax shift of 10.23 (with a 3% margin of error), the distance to this star is {{Convert|319|ly|pc|abbr=off|lk=on}}.

In 1962, Helmut Abt and John C. Golson announced that 108 Aquarii is a variable star. It was given its variable star designation in 1973.

This is an Ap star; meaning it has a peculiar spectrum that shows an overabundance of certain elements. It has more than three times the mass of the Sun and is 2.5 times the Sun's radius. 108 Aquarii is radiating 132 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 12,274 K. At this heat, the star has the white hue of an A-type star.

References

{{reflist|refs=

{{cite journal |last1=Adelman |first1=Saul J. |title=Variability of the uvby Light Curves of the Magnetic CP Star 108 Aquarii |journal=Baltic Astronomy |date=January 1999 |volume=8 |issue=3 |pages=369–383 |doi=10.1515/astro-1999-0304 |bibcode=1999BaltA...8..369A |s2cid=117653066 |doi-access=free }}

{{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 }}

{{cite journal |last1=Abt |first1=Helmut A. |last2=Golson |first2=John C. |title=Colors and Variability of Magnetic Stars |journal=Astrophysical Journal |date=July 1962 |volume=136 |pages=35–51 |doi=10.1086/147349 |url=https://articles.adsabs.harvard.edu/pdf/1962ApJ...136...35A |access-date=18 November 2024}}

{{cite journal |last1=Kukarkin |first1=B. V. |last2=Kholopov |first2=P. N. |last3=Kukarkina |first3=N. P. |last4=Perova |first4=N. B. |title=59th Name-List of Variable Stars |journal=Information Bulletin on Variable Stars |date=October 1973 |volume=834 |pages=1–22 |url=https://articles.adsabs.harvard.edu/pdf/1973IBVS..834....1K |access-date=18 November 2024}}

{{citation | last1=North | first1=P. | title=Do SI stars undergo any rotational braking? | journal=Astronomy and Astrophysics | volume=334 | pages=181–187 | bibcode=1998A&A...334..181N | arxiv=astro-ph/9802286 | postscript=. |date=June 1998}}

{{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 | doi=10.1086/340590 | bibcode=2002ApJ...573..359A | postscript=. |date=July 2002| doi-access=free }}

{{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | journal=Publications of the Department of Astronomy University of Chile | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | year=1966 | bibcode=1966PDAUC...1....1G | postscript=. }}

{{citation | last=Wilson | first=R. E. | year=1953 | title=General Catalogue of Stellar Radial Velocities | journal=Carnegie Institute Washington D.C. Publication | publisher=Carnegie Institute of Washington, D.C. | bibcode=1953GCRV..C......0W | postscript=. }}

{{citation | last1=Vilhu | first1=O. | last2=Tuominen | first2=I. V. | last3=Boyarchuk | first3=A. A. | contribution=Abundance Studies of Peculiar B Stars | title=Physics of Ap Stars, Proceedings of IAU Colloq. 32, held in Vienna, Austria, 8-11 September, 1976 | editor1-first=W. W. | editor1-last=Weiss | editor2-first=H. | editor2-last=Jenkner | editor3-first=H. J. | editor3-last=Wood | publisher=Universitatssternwarte Wien | page=563 | year=1976 | bibcode=1976paps.coll..563V | postscript=. }}

{{citation | last1=Przybylski | first1=A. | last2=Kennedy | first2=P. M. | title=Radial velocities and three-colour photometry of 166 southern stars | journal=Monthly Notices of the Royal Astronomical Society | volume=131 | pages=95–104 | year=1965 | bibcode=1965MNRAS.131...95P | postscript=. | doi = 10.1093/mnras/131.1.95 | doi-access=free }}

{{citation|bibcode=1995ApJS...99..135A|title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars|journal=The Astrophysical Journal Supplement Series|volume=99|pages=135|last1=Abt|first1=Helmut A.|last2=Morrell|first2=Nidia I.|year=1995|doi=10.1086/192182|doi-access=free}}

{{cite journal | doi=10.3847/1538-4357/ac3335 | year=2022 | title=Rotation Signature of TESS B-type Stars. A Comprehensive Analysis | last1=Barraza | first1=L. F. | last2=Gomes | first2=R. L. | last3=Messias | first3=Y. S. | last4=Leão | first4=I. C. | last5=Almeida | first5=L. A. | last6=Janot-Pacheco | first6=E. | last7=Brito | first7=A. C. | last8=Brito | first8=F. A. C. | last9=Santana | first9=J. V. | last10=Gonçalves | first10=N. S. | last11=Das Chagas | first11=M. L. | last12=Teixeira | first12=M. A. | last13=De Medeiros | first13=J. R. | last14=Canto Martins | first14=B. L. | journal=The Astrophysical Journal | volume=924 | issue=2 | page=117 | arxiv=2202.01022 | bibcode=2022ApJ...924..117B | s2cid=246030494 | doi-access=free }}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=23+51+21.3382-18+54+32.988&ident=V*+ET+Aqr&submit=Aladin+previewer Image ET Aquarii]

Category:Aquarius (constellation)

Category:Alpha2 Canum Venaticorum variables

Category:Durchmusterung objects

Category:Ap stars

Category:A-type main-sequence stars