Pi Tucanae

{{Starbox begin

| name = Pi Tucanae

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Tucana

| ra = {{RA|0|20|39.03682}}

| dec = {{DEC|−69|37|29.6821}}

| appmag_v = +5.49

}}

{{Starbox character

| class = B9 V

| b-v = −0.05

| u-b = −0.11

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|+10.50|2.60}}

| prop_mo_ra = −3.53

| prop_mo_dec = −0.10

| parallax = 10.25

| p_error = 0.21

| parallax_footnote =

| absmag_v = +0.57

}}

{{Starbox detail

| source =

| component1 = π Tuc A

| mass = {{Val|2.8|0.21|0.18}}

| radius =

| luminosity = 59

| temperature = {{Val|11393|387|fmt=commas}}

| gravity = {{Val|4.0|0.14}}

| metal_fe =

| rotational_velocity = 236

| rotation =

| age_myr = {{Val|206|48|79}}

| component2 = π Tuc B

| mass2 = 0.60

| radius2 = {{solar radius calculator|type=LT|0.063|3890|decimals=3}}{{efn|calculated using temperature and luminosity}}

| luminosity2 = 0.063

| temperature2 = 3,890

}}

{{Starbox catalog

| names = π Tuc, CPD−70°12, FK5 2018, HD 1685, HIP 1647, HR 83, SAO 248167

}}

{{Starbox reference

| Simbad = pi+Tuc

}}

Pi Tucanae (π Tuc, π Tucanae) is a double star in the southern constellation of Tucana. It is visible to the naked eye with a combined apparent visual magnitude of +5.49. Based upon an annual parallax shift of 10.25 mas as seen from Earth, it is located around 317 light years from the Sun.

The brighter star, component A, is a B-type main sequence star with a stellar classification of B9 V. At an age of about 206 million years, it is spinning rapidly with a projected rotational velocity of 236. The star has an estimated 2.8 times the mass of the Sun and radiates 59 times the solar luminosity from its photosphere at an effective temperature of 11,393 K.

There is a nearby visual companion, component B, but the two stars may not form a physical pair. This star has a K-band magnitude of 10.1 and is a source of X-ray emission. It has 60% of the Sun's mass and just 6.3% of the Sun's luminosity, with an effective temperature of 3,890 K. The pair have an angular separation of 2.28 arc seconds along a position angle of 211.4°, which corresponds to a projected separation of 214.1 AU.

Notes

References

{{reflist|refs=

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation

| display-authors=1 | last1=McDonald | first1=I.

| last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L.

| title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars

| journal=Monthly Notices of the Royal Astronomical Society

| volume=427 | issue=1 | pages=343–57 | date=2012

| bibcode=2012MNRAS.427..343M | arxiv=1208.2037

| doi=10.1111/j.1365-2966.2012.21873.x | doi-access=free | s2cid=118665352 | postscript=. }}

{{citation

| title=The Close Companion Mass-ratio Distribution of Intermediate-mass Stars

| display-authors=1 | last1=Gullikson | first1=Kevin

| last2=Kraus | first2=Adam | last3=Dodson-Robinson | first3=Sarah

| journal=The Astronomical Journal

| doi=10.3847/0004-6256/152/2/40 | bibcode=2016AJ....152...40G

| arxiv=1604.06456 | s2cid=119179065 | postscript=. | doi-access=free }}

{{citation | display-authors=1

| last1=Hubrig | first1=S. | last2=Le Mignant | first2=D.

| last3=North | first3=P. | last4=Krautter | first4=J.

| title=Search for low-mass PMS companions around X-ray selected late B stars

| journal=Astronomy and Astrophysics

| volume=372 | pages=152–164 | date=June 2001

| issue=1 | doi=10.1051/0004-6361:20010452 | bibcode=2001A&A...372..152H

| arxiv=astro-ph/0103201 | s2cid=17507782 | postscript=. }}

{{citation

| last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C.

| title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project

| journal=Astronomy & Astrophysics

| volume=546 | id=A61 | pages=14 | date=October 2012

| doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D

| arxiv=1208.3048 | s2cid=59451347 | postscript=. }}

{{citation

| title=Michigan catalogue of two-dimensional spectral types for the HD stars

| volume=1 | last1=Houk | first1=Nancy | postscript=.

| publication-place=Ann Arbor, Michigan

| publisher=Dept. of Astronomy, University of Michigan

| year=1979 | bibcode=1978mcts.book.....H }}

{{citation

| display-authors=1 | last1=Royer | first1=F.

| last2=Zorec | first2=J. | last3=Gómez | first3=A. E.

| title=Rotational velocities of A-type stars. III. Velocity distributions

| journal=Astronomy and Astrophysics

| volume=463 | issue=2 | pages=671–682 | date=February 2007

| doi=10.1051/0004-6361:20065224 | bibcode=2007A&A...463..671R

| arxiv=astro-ph/0610785 | s2cid=18475298 | postscript=. }}

{{citation

| title=UBV Observations of Variable Stars

| last1=Cousins | first1=A. W. J. | last2=Lagerweij | first2=H. C.

| journal=Monthly Notes of the Astronomical Society of Southern Africa

| volume=30 | page=12 | year=1971

| bibcode=1971MNSSA..30...12C | postscript=. }}

{{citation

| title=pi. Tuc -- Double or multiple star

| work=SIMBAD Astronomical Database

| publisher=Centre de Données astronomiques de Strasbourg

| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=pi.+Tuc

| accessdate=2017-04-20 | postscript=. }}

}}

Category:B-type main-sequence stars

Tucanae, Pi

Category:Tucana

Category:Durchmusterung objects

001685

001647

0083