Psi2 Aquarii

{{other stars by Bayer designation|Psi Aquarii{{!}}ψ Aquarii}}

{{Starbox begin

| name=ψ² Aquarii

}}

{{Starbox image

| image=

{{Location mark

|image=Aquarius constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=8|mark_link=ψ² Aqr

|x=230|y=470

}}

|caption=Location of ψ² Aquarii (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|23|17|54.21372}}

| dec = {{DEC|-09|10|57.0675}}

| appmag_v = 4.403

| constell = Aquarius

}}

{{Starbox character

| class = B5 Vn

| b-v = −0.146

| u-b = −0.561

| variable = λ Eri

}}

{{Starbox astrometry

| radial_v = −6

| prop_mo_ra = +17.13

| prop_mo_dec = −11.70

| parallax = 8.12

| p_error = 0.38

| parallax_footnote =

| absmag_v = −1.04

}}

{{Starbox detail

| mass =

| radius = 4.6

| luminosity = 565

| temperature = {{nowrap|15,212 ± 288}}

| metal_fe =

| rotational_velocity = 341

| age_myr =

}}

{{Starbox catalog

| names = ψ² Aqr, 93 Aquarii, BD−09°6160, HD 219688, HIP 115033, HR 8858, SAO 146620.

}}

{{Starbox reference

|Simbad=93+Aqr

}}

Psi² Aquarii, Latinized from ψ² Aquarii, is the Bayer designation for a star in the equatorial constellation of Aquarius. It is visible to the naked eye with an apparent visual magnitude of 4.4. Based upon parallax measurements made during the Hipparcos mission, the distance to this star is roughly {{Convert|400|ly|pc|abbr=off|lk=on}}.

File:Psi2AqrLightCurve.png for Psi² Aquarii, plotted from TESS data]]

This is a B-type main sequence star with a stellar classification of B5 Vn. The 'n' suffix indicates that the absorption lines in the spectrum are being broadened by Doppler shift from the star's rapid rotation rate. The projected rotational velocity of the star is 341 km/s. Psi² Aquarii is 4.6 times as large as the Sun with an effective temperature of 15,212 K in its outer envelope.

It is a λ Eridani variable, or periodic Be star, with a pulsation cycle lasting 1.073 days. The amplitude of the variation is 0.024 in magnitude.

References

{{reflist|refs=

{{citation |postscript=.

| title=MAST: Barbara A. Mikulski Archive for Space Telescopes

| url=https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html

| publisher=Space Telescope Science Institute |access-date=10 November 2022}}

{{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

| 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 | s2cid=119257644 | postscript=. }}

{{citation | display-authors=1 | last1=Underhill | first1=A. B. | last2=Divan | first2=L. | last3=Prevot-Burnichon | first3=M.-L. | last4=Doazan | first4=V. | title=Effective temperatures, angular diameters, distances and linear radii for 160 O and B stars | journal=Monthly Notices of the Royal Astronomical Society | volume=189 | pages=601–605 |date=November 1979 | issue=3 | bibcode=1979MNRAS.189..601U | postscript=. | doi=10.1093/mnras/189.3.601| doi-access=free }}

{{citation | last=Lesh | first=Janet Rountree |date=December 1968 | title=The Kinematics of the Gould Belt: an Expanding Group? | journal=Astrophysical Journal Supplement | volume=17 | page=371 | doi=10.1086/190179 | bibcode=1968ApJS...17..371L | postscript=. | doi-access=free }}

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

{{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | page=1 | bibcode=1970CoAsi.239....1B | postscript=. }}

{{citation | last1=Kozok | first1=J. R. | title=Photometric observations of emission B-stars in the southern Milky Way | journal=Astronomy and Astrophysics Supplement Series | volume=61 | pages=387–405 |date=September 1985 | bibcode=1985A&AS...61..387K | postscript=. }}

{{cite simbad | title=* 93 Aqr | access-date=2012-07-06 | mode=cs2 | postscript=. }}

{{citation | last1=Balona | first1=L. A. | title=Tests of the Pulsation and Starspot Models for the Periodic Be-Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=277 | issue=4 | page=1547 |date=December 1995 | bibcode=1995MNRAS.277.1547B | postscript=. |doi = 10.1093/mnras/277.4.1547 | doi-access=free }}

{{citation | last1=Balona | first1=L. A. | title=Short-period variability in Be stars | journal=Monthly Notices of the Royal Astronomical Society | volume=245 | pages=92–100 |date=July 1990 | doi=10.1093/mnras/245.1.92 | bibcode=1990MNRAS.245...92B | postscript=. | doi-access=free }}

}}

External links

[http://aladin.u-strasbg.fr/AladinPreview?-c=23+17+54.2152-09+10+57.048&ident=V*+psi02+Aqr&submit=Aladin+previewer Image Psi2 Aquarii]

219688

Aquarii, Psi2

Aquarii, 093

Category:Aquarius (constellation)

Category:B-type main-sequence stars

115033

8858

BD-09 6160

Category:Lambda Eridani variables